Caterpillar 320B N
Caterpillarexcavator

Caterpillar 320B N

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 320B N is a mid-size hydraulic crawler excavator in Caterpillar's 20-ton class, built as the narrow-gauge-undercarriage trim of the 320B family. It runs the Cat 3066T turbocharged inline-six diesel, rated around 128 hp (95 kW) net, driving a load-sensing hydraulic system through a variable-displacement piston pump. Operating weight lands near 19,930 kg (43,938 lb) for the N configuration, though the wider 320B lineup spans roughly 19,800 kg to 21,300 kg (43,700 lb to 47,000 lb) depending on trim (standard, L long-undercarriage, N narrow-gauge, S severe-duty). Caterpillar built the 320B family from the early-to-mid 1990s into the early 2000s, replacing the original Cat 320 and later giving way to the 320C. Buyers could spec the 320B N with a choice of boom and stick lengths and a range of buckets, matched to the same narrowed 2200 mm (7.22 ft) track gauge and 2500 mm (8.2 ft) shipping width that define the N trim.

Where the base 320B and 320B L carry a standard-width undercarriage for maximum stability and lift capacity, the 320B N substitutes a narrower track frame and gauge, built for jobsites with restricted access, such as mountainous terrain, utility corridors, or transport-restricted routes, while keeping the same engine, hydraulics, and upper structure as its siblings. The follow-on 320C kept the same 3066T engine family but added revised electronics and cooling, a sign of how incremental the B-to-C transition was on the powertrain side. In the used and parts market today, the 320B N holds value for its mechanically governed engine and analog controls, straightforward to diagnose and rebuild without proprietary electronic diagnostics, and for sharing its major driveline, hydraulic, and engine components with the broader 320B line. What sets it apart for parts sourcing is the narrow-gauge undercarriage itself: track frames, rollers, idlers, and shoes sized for the N's tighter gauge are not interchangeable with standard or L-trim 320B undercarriages, so buyers shopping used units or parts need to confirm gauge and shoe width before ordering.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar 320B N specifications

Engine

Engine modelCat 3066T diesel, 6-cylinder, turbocharged
Gross power134 hp (99.9 kW) at 1800 rpm — shared 3066T rating across the 320B family
Net power128 hp (95.5 kW), rated to ISO 9249 / SAE J1349 / EEC 80/1269 — this is the figure published directly for the N configuration
Displacement / bore & stroke6.4 L (389-390.6 cu in); bore 104 mm (4.1 in) x stroke 132 mm (5.2 in)
Emissions tierNot documented for this specific model. Production falls inside the nonroad Tier 1 phase-in window (mid-to-late 1990s); no certified tier rating is published in available spec sheets for the 320B N — verify with a dealer if compliance documentation is needed

Weights

Operating weight (N / narrow-gauge undercarriage)19,930 kg (43,938 lb)
Ground pressureNot published specifically for the narrow-gauge (N) configuration. The long-undercarriage 320B variant with reach boom and HD bucket runs 35.7-38.4 kPa (5.2-5.6 psi) depending on counterweight; the N's narrower 500 mm shoes (vs 602 mm on the long-undercarriage variant) would read higher for a comparable operating weight
Transport weightNot separately documented; shipping condition uses the same operating weight figure above

Dimensions

Height, top of cab2.94-2.96 m (9.65-9.70 ft)
Width over tracks2.50-2.53 m (8.21-8.30 ft)
Tail swing radius2.75-2.77 m (9.03-9.10 ft)
Track shoe width500 mm (19.69 in)
Track gauge2.20-2.23 m (7.22-7.30 ft)
Ground clearance0.475-0.49 m (1.56-1.60 ft)
Undercarriage length (track on ground)3.27 m (10.72 ft)
Transport (shipping) length9.0 m (29.53 ft) with the short mass boom and stick fitted; shipping height in that configuration is 3.05 m (10.01 ft). Shipping length is not separately published for the reach-boom configurations

Performance

Max digging depth5.20-7.58 m (17.07-24.87 ft), varies by boom/stick option — six factory boom-and-stick combinations are offered
Max reach along ground8.30-10.63 m (27.24-34.88 ft), varies by boom/stick option
Max cutting height8.54-9.73 m (28.02-31.93 ft), varies by boom/stick option
Max loading (dump) height5.69-6.93 m (18.67-22.74 ft), varies by boom/stick option
Max vertical-wall digging depth4.43-6.80 m (14.54-22.31 ft), varies by boom/stick option
Max travel speed5.5 km/h (3.42-3.50 mph)
Drawbar pull177 kN (39,800 lb)
Hydraulic system relief pressure / pump flowRelief valve 34,336 kPa (4,980 psi); combined pump flow 370 L/min (97.8 gal/min)
Swing speedNot documented in available spec sheets for this model — verify with a dealer if needed
GradeabilityNot documented in available spec sheets for this model — verify with a dealer if needed

Forces

Bucket digging forceNot documented in available period spec sheets for the 320B/320B N family — verify with a dealer or shop manual if needed
Stick (arm) digging forceNot documented in available period spec sheets for the 320B/320B N family — verify with a dealer or shop manual if needed
Swing torque57 kN·m (42,050 lb-ft) — published for the shared swing drive across the 320B family

Service capacities (summary)

Fuel tank340 L (89.9-90 gal)
Hydraulic system, including tank220 L (58-58.2 gal)
Engine oil19.3-20.8 L (5.1-5.5 gal)
Cooling system25-25.4 L (6.6-6.7 gal)
Swing drive6.1 L (1.6 gal)
Final drive, each side9.8 L (2.6 gal)

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

320B N fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with oil filter)19.3–20.5 L (5.1–5.4 US gal) — figure varies slightly by source/configCat DEO or DEO-ULS diesel engine oil. Standard grade SAE 15W-40; select viscosity by ambient starting temperature — SAE 10W-30 covers a wider cold range, with a cold-weather multigrade for extreme low temperatures.
Cooling system25.0 L (6.6 US gal)Cat DEAC (Diesel Engine Antifreeze/Coolant) as a 50/50 premix with clean water for standard freeze and boil protection. Cat ELC (Extended Life Coolant) is a compatible alternative; neither needs a separate supplemental coolant additive when used as the factory-spec product.
Fuel tank340.3–340.7 L (89.9–90 US gal)No. 2-D diesel fuel meeting Cat's diesel fuel specification. Use a winterized/low-temperature blend in cold climates to prevent fuel gelling and filter plugging.
Hydraulic system, total including tank219.5–220 L (58 US gal) total system fill; hydraulic tank alone is not broken out separately in the available spec sheetsCat HYDO Advanced hydraulic oil is the preferred fill; Cat TDTO (TO-4 Transmission/Drive Train Oil) is an accepted alternate for the hydraulic tank. Grade is selected by ambient operating temperature per Cat's hydraulic oil viscosity guidance.
Final drive (each)9.84–9.9 L (2.6 US gal) per sideCat TDTO (TO-4 Transmission/Drive Train Oil). Standard grade is SAE 10W; heavier SAE 30 or SAE 50 grades apply in sustained high ambient temperatures per Cat's TDTO viscosity-by-temperature guidance.
Swing drive6.06–6.1 L (1.6 US gal)Cat TDTO (TO-4 Transmission/Drive Train Oil), same grade selection logic as the final drives.
Grease (spec only)Not a fill-volume item; applied at pin and bushing grease fittings per the lube scheduleCat multipurpose NLGI-2 moly grease (Cat Prime Application Grease) for standard-duty pins and bushings. Cat Extreme Application grease is specified for high-load or high-temperature pivot points.

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar 320B N maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil, coolant, and hydraulic tank levels before startup.
  • Drain water and sediment from the fuel/water separator.
  • Walk around the machine and inspect for hydraulic, fuel, and coolant leaks, plus loose track shoe bolts.
  • Grease boom, stick, and bucket linkage pins.
  • Weekly, check track sag and tension on the narrow-gauge undercarriage and clean debris from around the swing bearing and travel motors.
  • Weekly, inspect the primary air filter element for dust loading and clean battery terminals.
Every 250 h
  • Change engine oil and filter on the 3066T diesel.
  • Replace the primary fuel filter element.
  • Check and adjust alternator and fan belt tension.
  • Pull engine oil and hydraulic oil samples for S·O·S fluid analysis.
  • Clean radiator, oil cooler, and aftercooler fins of built-up debris.
  • Check track adjuster grease and re-tension the narrow-gauge undercarriage as needed.
Every 500 h
  • Replace the hydraulic tank return filter element.
  • Wash the hydraulic tank suction screen.
  • Check swing drive and final drive oil levels.
  • Inspect turbocharger mounting and boost hoses for leaks or cracking.
  • Test coolant condition and additive concentration.
  • Check battery electrolyte level and clean terminals.
Every 1,000 h
  • Change the swing drive gear oil.
  • Sample final drive oil in both travel motors and top off as needed.
  • Check and torque track shoe bolts across the narrow-gauge undercarriage.
  • Check swing bearing bolt torque.
  • Inspect fuel injection lines and the turbocharger for wear.
  • Clean or replace the cab air filter.
Every 2,000 h
  • Change hydraulic tank oil and clean the tank breather.
  • Change final drive gear oil in both travel motors.
  • Check and adjust engine valve lash on the 3066T.
  • Flush the cooling system and replenish coolant and additive per spec.
  • Pressure- and flow-test the main hydraulic pump and control valve for internal wear.
  • Inspect undercarriage rollers, idlers, and sprockets for wear on the narrower track frames.
Every 4,000 h
  • Overhaul or replace fuel injectors and verify injection timing on the 3066T.
  • Inspect and rebuild the turbocharger cartridge as needed.
  • Inspect the swing bearing raceway and gear teeth for wear and shim as required.
  • Evaluate the main pump, swing motor, and travel motors for rebuild based on S·O·S trending.
  • Replace worn track rollers, idlers, sprockets, pins, and bushings on the narrow-gauge undercarriage.
  • Pressure-test and recondition the main relief and cylinder-holding valves.

Servicing the 320B N beyond the schedule

Predictive Maintenance & Fluid Analysis

The 3066T's mechanical governor and injection pump carry no ECM fault codes, so scheduled S·O·S sampling of engine oil, hydraulic tank oil, swing drive, and final drive gear oil is the main early-warning system on a 320B N. Trend iron and silicon counts against the narrow-gauge undercarriage's higher wear rate from reduced ground contact width. Watch coolant condition and additive concentration to catch water pump and liner cavitation issues before they reach the block. Track hydraulic oil cleanliness closely; the load-sensing pump and valve stack are unforgiving of contamination.

Corrective & Common Repairs

Common 320B N repairs center on the travel motor and final drive duo-cone (floating face) seals; once they weep gear oil, contamination follows fast and the planetary hub wears out. The narrower track frame sees more twisting load than standard-gauge 320B undercarriages, accelerating roller, idler, and sprocket wear and loosening track adjuster grease seals. On the engine side, expect injector and injection-pump wear by mid-life, showing up as hard starting and smoke. Pilot system pressure switches and hydraulic hose chafing around the narrow undercarriage are frequent electrical and leak points.

Overhaul & Rebuild Points

Major rebuild points on a 320B N arrive predictably between 8,000 and 12,000 hours: swing bearing and gear wear opens up backlash, main pump and travel/swing motor efficiency drops enough to warrant a teardown, and the 3066T typically needs a top-end or inframe overhaul as compression and blow-by worsen. Because the undercarriage runs narrower than standard 320B trims, full track chain, roller, idler, and sprocket replacement tends to come sooner and costs more per set to match the N's gauge. Budget turbocharger and injection pump rebuilds alongside the engine work.

Seasonal & Environment Servicing

320B N units built for confined and mountainous sites pick up more mud and debris packed into the narrower track frame and rollers than standard-gauge machines; wash out the undercarriage regularly to keep track adjusters and rollers from seizing. In cold climates, switch to a winter-grade hydraulic oil and verify the ether or glow-plug starting aid on the 3066T before freezing weather hits. Check coolant freeze protection each fall. In hot, dusty applications, clean radiator, oil cooler, and aftercooler fins more often than the standard interval to prevent overheating.

320B N fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
2302Governor actuator feedback signal is unstable or deviates from the expected value.Faulty governor actuator, damaged wiring or a corroded connector at the actuator, or a marginal engine speed control module.With the key off, disconnect the governor actuator connector and check reference voltage at the connector (normal range is roughly 4.5-5.5 V DC); out-of-range voltage points to wiring, in-range voltage points to the actuator or control module.
1302Engine oil pressure has dropped below the acceptable threshold.Low engine oil level, a plugged oil filter, a worn oil pump, or a faulty oil pressure sender.Shut the engine down, check oil level and top up with the correct-grade Cat engine oil, inspect for leaks and filter condition, then test the pressure sender if oil and filter check out.
1303Engine coolant temperature has exceeded the normal operating range.Low coolant level, a plugged radiator core, a slipping or failed fan drive, or a faulty coolant temperature sensor.Let the engine cool before opening the cooling system, check coolant level, inspect the radiator fins and fan drive for debris or slippage, then verify the temperature sensor if the cooling components are sound.
1304Hydraulic oil temperature has exceeded the normal operating range.Low hydraulic oil level, a plugged hydraulic oil cooler, sustained high-load operation, or a failing cooler fan.Reduce load and let the machine idle to cool, check hydraulic oil level and cooler fins for debris, confirm the cooler fan turns, then verify the temperature sender if the cooling circuit checks out.
1305Engine air intake filter element is restricted or blocked.A dirty or clogged primary air filter element, or a faulty restriction sensor/switch.Inspect and replace the primary air filter element as needed; check the restriction sensor and its wiring if the code persists with a known-clean filter.
2201Battery or system voltage is outside the normal operating range.A weak or failing battery, loose or corroded battery cable connections, or a faulty alternator/charging circuit.Check battery state of charge and terminal connections, inspect charging system output at the alternator, and repair or replace components as needed.
4101Monitor system memory (RAM) fault detected in the machine's monitor/controller.An internal monitor panel or controller fault, or a transient power interruption that corrupted monitor memory.Cycle the key switch off and back on to clear a transient fault; if the code returns, the monitor panel or controller likely needs a dealer-level check, reset, or replacement.
3201Calibration data error in the machine's electronic monitor/control system.Lost or corrupted calibration parameters in the controller, often following a battery disconnect or power interruption.Have a dealer technician recalibrate or reprogram the affected controller with the proper service tool, and verify battery connections are secure to prevent recurrence.

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

320B N attachments & work tools

Buckets

General-duty buckets for this 20-ton class run about 0.8-1.0 m3 (1.0-1.3 yd3); heavy-duty rock buckets top out near 1.2-1.36 m3 (1.6-1.8 yd3). Typical widths span roughly 600 mm to 1500 mm (24 to 60 in). Buckets use the 320B family's B-linkage two-pin mount with 80 mm (3.15 in) pins, fitted either pin-on or through a B-linkage quick coupler.

Hydraulic hammers

The 320B N sits in the roughly 20 metric-ton breaker size class based on its operating weight. Hammers built for this class run a tool/chisel diameter near 125-140 mm (5-5.5 in), auxiliary flow around 120-180 l/min (32-48 gpm), and working pressure near 155-175 bar (2250-2550 psi). Impact rate is roughly 350-650 bpm, varies by hammer make and box- vs top-mount design.

Quick couplers

Machines in this class take a hydraulic pin-grabber quick coupler built to the B-linkage, engaging the same 80 mm (3.15 in) bucket pins used by pin-on tools. The coupler is cab-controlled from a dash switch and includes a mechanical backup lock that holds the attachment if hydraulic pressure is lost.

Thumbs/grapples

Hydraulic thumb kits for this class mount either pin-on or through the quick coupler and are sized to match roughly 900 mm to 1500 mm (36 to 60 in) buckets, using a 2-tine pin-grabber design run off its own cylinder on the auxiliary circuit. Orange-peel and demolition grapples sized for the 14-31 ton excavator range fit this machine's weight class, running off the same medium/high-pressure auxiliary circuit.

Rippers

A single-shank ripper is available on the B-linkage, pin-mounted with 80 mm (3.15 in) pins. Typical overall length runs near 1.5 m (59 in) with a shank length near 1.1 m (43 in). It's used for breaking rock, frozen ground, or pavement beyond what the bucket can manage, and for shallow ripping passes.

Hydraulic-kit notes

Factory auxiliary hydraulics on this excavator class add a dedicated attachment circuit, with cab-selectable flow presets to match tool type. Hammers and grapples run on a medium-pressure setting (roughly 150-180 bar); shears and pulverizers need the high-flow/high-pressure setting instead. Confirm the machine's actual auxiliary valve and relief setting against the tool maker's spec sheet before pairing any attachment.

All 320B N assemblies by section

Every catalogued assembly group for the Caterpillar 320B N. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Air Inlet And Exhaust System
1099313 Mounting Gp-Air Cleaner
1241711 Air Cleaner Gp
5i7589 Cartridge As-Turbocharger
1189890 Lines Gp-Air
5i7766 Lines Gp-Air
1189828 Lines Gp-Drain
5i7765 Manifold Gp-Exhaust
5I***65Manifold Group-Exhaust; (Exhaust)1
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5i7764 Manifold Gp-Inlet
5i8006 Muffler Gp
5i8033 Muffler Gp
5i8018 Turbocharger Gp
5i7952 Turbocharger Gp
Basic Engine
5i7755 Camshaft Gp
5i7753 Cover Gp-Valve Mechanism
5I***53Cover Group-Valve Mechanism; (Valve Mechanism)1
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1252955 Crankshaft Gp
5i7972 Crankshaft Gp
1352339 Cylinder Block Gp
1352340 Cylinder Block Gp
1253015 Cylinder Block Gp
5i7751 Cylinder Head Gp
5i8027 Flywheel Gp
5i7763 Gear Gp-Front
5i8032 Gear Gp-Front
1252953 Housing Gp-Flywheel
5i7971 Housing Gp-Front
5i7757 Housing Gp-Front
1099499 Mounting Gp-Engine
1252954 Pan Gp-Oil
5i7760 Piston & Rod Gp
5i7752 Valve Mechanism Gp
Cooling System
1252956 Cooler Gp-Engine Oil
12***56Cooler Group-Engine Oil; (Engine Oil)1
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1263799 Cooling Ar
12***99Cooling Ar1
12***65Hood Group1
13***17Engine Ar1
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1317656 Cooling Ar
12***65Hood Group1
13***56Cooling Ar1
13***72Sheet1
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5i7774 Fan Gp-Suction
1398732 Guard Gp-Fan
1252959 Lines Gp-Water
1253016 Pump Gp-Water
5i7973 Pump Gp-Water
1099496 Radiator & Hyd Oil Cooler Gp
10***96Radiator & Hydraulic Oil Cooler Group1
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1099495 Radiator Gp
Electrical And Starting System
3e7738 Alarm As-Backup
1114696 Alarm Gp-Travel
5i8085 Alternator Gp-Charging
1252994 Alternator Gp-Charging
12***94Alternator Group-Charging; (Charging)1
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1160150 Battery & Wiring Gp - Part 1 Of 2
1160150 Battery & Wiring Gp - Part 2 Of 2
1160153 Battery & Wiring Gp-Cold Weath
1160242 Cable As
1160080 Cable As
1254727 Cable As
128871 Cable As
1160228 Cable As
1190606 Control & Mtg Gp-Electronic
11***06Control & Mtg Group-Machine; (Engine, Hydraulic)1
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1160136 Converter Gp-Electrical
1507021 Converter Gp-Electrical
1507022 Harness As-Wiring
15***22Harness As1
15***23Harness As1
15***24Harness As1
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1160227 Harness As
1364056 Harness As-Wiring - Part 3 Of 3
1364056 Harness As-Wiring - Part 1 Of 3
1507024 Harness As-Wiring
1160259 Harness As
1532496 Harness As
1160243 Harness As
1288970 Harness As
1673494 Harness As
1507023 Harness As-Wiring
1364057 Harness As
1364056 Harness As-Wiring - Part 2 Of 3
1160247 Harness As
1385127 Harness As
1254873 Harness As-Wiring
1506998 Harness As-Wiring - Part 1 Of 3
1160258 Harness As
11***58Harness As1
11***59Harness As1
11***60Harness As1
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1506998 Harness As-Wiring - Part 3 Of 3
1506998 Harness As-Wiring - Part 2 Of 3
1160260 Harness As
1114843 Harness As
1321893 Harness As-Console
1321894 Harness As-Console
1506999 Harness As-Console
15***99Harness As-Console1
15***00Harness As-Console; (Console)1
15***01Harness As-Console; (Console)1
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1114842 Harness As
1114841 Harness As
11***41Harness As-Console1
11***42Harness As-Console; (Console)1
11***43Harness As-Console; (Console)1
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1288966 Harness As-Console - Part 1 Of 2
1507001 Harness As-Console - Part 1 Of 2
1507000 Harness As-Console - Part 1 Of 2
1321892 Harness As-Console
13***92Harness As-Console1
13***93Harness As-Console; (Console)1
13***94Harness As-Console; (Console)1
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1288966 Harness As-Console - Part 2 Of 2
1507000 Harness As-Console - Part 2 Of 2
1507001 Harness As-Console - Part 2 Of 2
1532491 Harness As-Console
1114795 Harness As-Wiring
1210998 Harness As-Wiring - Part 1 Of 3
1506994 Harness As-Wiring
1210998 Harness As-Wiring - Part 3 Of 3
1532484 Harness As-Wiring - Part 1 Of 3
1532556 Harness As-Wiring
1532555 Harness As-Wiring
15***55Harness As-Wiring1
15***56Harness As-Wiring; (Wiring)1
15***57Harness As-Wiring; (Wiring)1
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1532557 Harness As-Wiring
1532484 Harness As-Wiring - Part 2 Of 3
1506992 Harness As-Wiring
15***92Harness As-Wiring1
15***93Harness As-Wiring; (Wiring)1
15***94Harness As-Wiring; (Wiring)1
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1506991 Harness As-Wiring
1532484 Harness As-Wiring - Part 3 Of 3
1506990 Harness As-Wiring
1114796 Harness As-Wiring
1506993 Harness As-Wiring
1506989 Harness As-Wiring
15***89Harness As-Wiring1
15***90Harness As-Wiring; (Wiring)1
15***91Harness As-Wiring; (Wiring)1
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1210998 Harness As-Wiring - Part 2 Of 3
5i8250 Lamp Gp-Flood
15***78Lamp Group-Flood1
15***52Lamp Group-Flood1
5I***50Lamp Group-Flood; -Boom1
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1114813 Lamp Gp-Flood
1506978 Lamp Gp-Flood
5i8251 Lamp Gp-Flood
1532521 Lamp Gp-Flood
15***21Lamp Group-Flood; -Chassis, Boom-Boom, Rear1
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1532452 Lamp Gp-Flood
1532523 Lamp Gp-Flood
15***23Lamp Group-Flood; -Horizontal Rh1
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1160215 Lighting Gp-Boom
11***15Lighting Group-Boom; -Short Boom, Rh1
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1160214 Lighting Gp-Boom
11***14Lighting Group-Boom; -Long Boom, Rh1
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1160157 Lighting Gp-Boom
7y8189 Lighting Gp-Cab
1114694 Lighting Gp-Cab
4i5409 Lighting Gp-Chassis
4I***09Lighting Group-Chassis; -Front, Rh1
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1254774 Lighting Gp-Chassis
12***74Lighting Group-Chassis; (Chassis)1
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1252962 Mounting Gp-Alternator
12***62Mounting Group-Alternator; (Alternator)1
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1352344 Mounting Gp-Alternator
13***44Mounting Group-Alternator; (Alternator)1
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1252963 Mounting Gp-Starting Motor
1160151 Panel Gp-Circuit Breaker - Part 2 Of 2
1160151 Panel Gp-Circuit Breaker - Part 1 Of 2
1507030 Speaker Gp-Radio
1252988 Starting Motor Gp-Electric
5c6108 Switch As
5C***08Switch As; (Fuel Tank Shut Off)1
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1114799 Switch As
11***99Switch As; (Hydraulic Lockout, Neutral Start)1
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1160095 Switch As
1160097 Switch As
7n0718 Switch As-Disconnect
7N***18Switch As-Disconnect; -Battery-Ground Level1
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1752314 Switch As-Magnetic
1752313 Switch As-Magnetic
1140421 Switch As-Toggle
11***21Switch As-Toggle; (Counterweight Removal)1
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1107884 Switch As-Toggle
11***84Switch As-Toggle; (Momentary)(Manual Engine Speed Control)1
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7n0719 Switch As-Disconnect Part Of 1160153-Page 79
7N***19Switch Group-Disconnect; -Battery1
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1251302 Switch As-Magnetic
12***02Switch Group-Magnetic; -Starting Motor, Start Relay1
17***13Switch As-Magnetic; (Magnetic)1
17***14Switch As-Magnetic; (Magnetic)1
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1060107 Switch As
10***07Switch Group-Rotary; -Autodig Material Select-Throttle Position1
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9g7641 Switch Gp-Heat Start
9G***41Switch Group-Start; -Engine, Key-Vims Service1
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1114870 Timer As
1321827 Wire As
1060054 Wiring Gp-Cab
1160159 Wiring Gp
1060058 Wiring Gp-Console
1060057 Wiring Gp-Console
10***57Wiring Group-Console; (Console)1
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1400865 Wiring Gp-Radio
14***65Wiring Group-Console; (Console)1
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1060056 Wiring Gp-Console
10***56Wiring Group-Console1
10***57Wiring Group-Console; (Console)1
10***58Wiring Group-Console; -Rh1
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1160176 Wiring Gp-Fine Swing
1160094 Wiring Gp
1507025 Wiring Gp
1400867 Wiring Gp-Radio
1160083 Wiring Gp-Refueling Pump
11***83Wiring Group-Refueling Pump; (Refueling Pump)1
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1114695 Wiring Gp-Lower Wiper
Engine Arrangement
1099514 Engine Ar - Part 1 Of 2
10***14Engine Ar1
12***53Housing Group-Flywheel1
12***54Pan Group-Oil; (Oil)1
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1319017 Engine Ar - Part 2 Of 2
12***56Cooler Group-Engine Oil; (Engine Oil)1
12***60Lines Group-Fuel; (Fuel)1
12***63Mounting Group-Starting Motor1
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1319017 Engine Ar - Part 1 Of 2
12***53Housing Group-Flywheel1
12***54Pan Group-Oil; (Oil)1
12***57Filter Group-Engine Oil; (Engine Oil)1
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1099514 Engine Ar - Part 2 Of 2
10***14Engine Ar1
12***56Cooler Group-Engine Oil; (Engine Oil)1
12***59Lines Group-Water; (Water)1
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1099513 Engine Ar - Part 2 Of 2
10***13Engine Ar1
12***56Cooler Group-Engine Oil; (Engine Oil)1
12***60Lines Group-Fuel; (Fuel)1
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1099513 Engine Ar - Part 1 Of 2
10***13Engine Ar1
12***53Housing Group-Flywheel1
12***54Pan Group-Oil; (Oil)1
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Frame And Body
1089844 Box & Mounting Gp
1224022 Box & Mtg Gp-Storage
12***22Box & Mtg Group-Storage; (Storage)1
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1168396 Box Gp-Storage
1224023 Box Gp-Storage
1372273 Counterweight Gp
1372272 Counterweight Gp
1174275 Fender & Cover Gp
1174311 Door Gp-Hood
1174308 Door Gp-Hood
1400616 Door Gp-Hood
1224068 Door Gp-Hood
1680549 Frame As-Undercarriage
1175487 Frame As-Undercarriage
1372801 Frame Gp-Upper
1362903 Gear & Bearing Gp - Part 1 Of 2
1362903 Gear & Bearing Gp - Part 2 Of 2
1204996 Guard Ar-Bottom
12***96Guard Ar-Bottom1
12***05Guard Group-Bottom1
12***26Guard Group-Travel Motor1
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1174265 Guard Gp-Bottom
1215105 Guard Gp-Bottom
1348850 Guard Gp-Swivel
0875908 Guard Gp-Track Guide
08***08Guard Group-Track Guide; -Center1
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1175490 Guard Gp-Track Motor
1271426 Guard Gp-Track Motor
1223877 Handle Gp-Storage Door
1174270 Handhold Gp
1372289 Handhold Gp
1174267 Hood & Guard Gp - Part 1 Of 3
1174267 Hood & Guard Gp - Part 2 Of 3
1174267 Hood & Guard Gp - Part 3 Of 3
1293365 Hood Gp-Perforated
1205228 Hood Gp-Engine
1156421 Idler Gp-Front
1156419 Idler Gp-Front
1156420 Idler Gp-Front
1132907 Idler Gp-Front
9w9354 Link As-Track
1646893 Link As-Track
1425479 Plate Set
7y1607 Roller Ar-Track & Carrier
8e5600 Roller Gp-Track Carrier
8E***00Roller Group-Track Carrier; (Track Carrier)1
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1634143 Roller Gp-Track-Single Flange
16***43Roller Group-Track-Single Flange; (Track) (Single Flange)1
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1557082 Box Gp-Storage
1557081 Box & Mtg Gp-Storage
1168395 Box & Mtg Gp-Storage
1156423 Track Adjuster & Recoil Gp
11***23Track Adjuster & Recoil Group; -Lh1
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1156422 Track Adjuster & Recoil Gp
11***22Track Adjuster & Recoil Group; -Rh1
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1156424 Track Adjuster & Recoil Gp
1156425 Track Adjuster & Recoil Gp
9w9359 Track Gp
12***61Shoe-Track; (500mm Wide)45
9W***61Nut - Track (M20x1.5-6g Thd)180
9W***19Bolt - Track (M20x1.5x55mm)180
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1646624 Track Gp
12***62Shoe; (Track)45
16***24Track Group1
16***93Link As-Track; (Track)1
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9w9360 Track Gp
12***62Shoe; (Track)45
9W***61Nut - Track (M20x1.5-6g Thd)180
9W***19Bolt - Track (M20x1.5x55mm)180
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Fuel System
1262975 Control Gp-Governor
5i7954 Filter Gp-Fuel
1713270 Filter Gp-Fuel
1253017 Lines Gp-Fuel
1174277 Lines Gp-Fuel
1252960 Lines Gp-Fuel
5i7706 Nozzle Gp-Unit Injector
1317646 Pump Ar-Fuel Transfer
10***45Pump Group-Fuel Transfer; (Fuel Transfer)1
11***83Wiring Group-Refueling Pump; (Refueling Pump)1
12***96Tank & Mtg Group-Fuel; (Storage)1
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1540648 Pump Gp-Fuel Injection - Part 3 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 1 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 5 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1540648 Pump Gp-Fuel Injection - Part 6 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 5 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1540648 Pump Gp-Fuel Injection - Part 2 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 4 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 1 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 4 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1540648 Pump Gp-Fuel Injection - Part 1 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 6 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 6 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 2 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1540648 Pump Gp-Fuel Injection - Part 5 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 2 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1253018 Pump Gp-Fuel Injection - Part 3 Of 6
12***18Pump Group-Fuel Injection; (Fuel Injection)1
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1540648 Pump Gp-Fuel Injection - Part 4 Of 6
15***48Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 3 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1843961 Pump Gp-Fuel Injection - Part 7 Of 7
18***61Pump Group-Fuel Injection; (Fuel Injection)1
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1089845 Pump Gp-Fuel Transfer
10***45Pump Group-Fuel Transfer; (Fuel Transfer)1
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1272308 Separator Gp-Water
1174341 Tank & Mtg Gp-Fuel
1223996 Tank & Mtg Gp-Fuel
12***96Tank & Mtg Group-Fuel; (Storage)1
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1223997 Tank Gp-Fuel
1174342 Tank Gp-Fuel
Hydraulic System
5i8416 Accumulator Gp
5I***16Accumulator Group-Hydraulic; -Charged-Pilot Oil1
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0874454 Accumulator Gp
08***54Accumulator Group-Hydraulic; -Charged-Pilot Oil1
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0874456 Accumulator Gp
08***56Accumulator Group-Hydraulic; -Charged-Pilot Oil1
4I***36Accumulator Group-Hydraulic; -Charged-Pilot Oil1
5I***16Accumulator Group-Hydraulic; -Charged-Pilot Oil1
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4i1536 Accumulator Gp
4I***36Accumulator Group-Hydraulic; -Charged-Pilot Oil1
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1733503 Block Gp-Hydraulic
17***03Base Group-Oil Filter; -Hydraulic1
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1354005 Control Ar-Auxiliary
11***28Control Group-Hydraulic Pedal; -Auxiliary1
12***48Film Group1
13***29Lines Group-Pilot1
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1169172 Control Ar-Auxiliary
11***28Control Group-Hydraulic Pedal; -Auxiliary1
11***72Control Ar-Auxiliary1
11***76Lines Group-Pilot1
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1169161 Control Ar-Auxiliary
10***31Control Group-Auxiliary Pedal; -Auxiliary1
11***61Control Ar-Auxiliary1
11***76Lines Group-Pilot1
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1169165 Control Ar-Auxiliary
10***31Control Group-Auxiliary Pedal; -Auxiliary1
11***65Control Ar-Auxiliary1
11***78Lines Group-Pilot1
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1169175 Control Ar-Auxiliary
11***28Control Group-Hydraulic Pedal; -Auxiliary1
11***75Control Ar-Auxiliary1
11***78Lines Group-Pilot1
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1354004 Control Ar-Auxiliary
10***31Control Group-Auxiliary Pedal; -Auxiliary1
12***47Film Group1
13***29Lines Group-Pilot1
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1096031 Control Gp-Hydraulic
10***31Control Group-Auxiliary Pedal; -Auxiliary1
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1540569 Control Gp-Pilot Operated Hyd
1337899 Control Gp-Pilot Operated Hyd
13***99Control Group-Handle; -Lh Joystick1
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1337900 Control Gp-Pilot Operated Hyd
13***00Control Group-Handle; -Rh Joystick1
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1352272 Control Gp-Hydraulic
13***72Control Group-Hydraulic Pedal; -Third Pedal1
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1116428 Control Gp-Hydraulic
11***28Control Group-Hydraulic Pedal; -Auxiliary1
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1764985 Valve Gp-Pilot
17***85Control Group-Joystick; -Rh-Boom & Work Tool1
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1764986 Valve Gp-Pilot
17***86Control Group-Joystick; -Lh-Stick & Swing1
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1116284 Control Gp-Pilot Operated Hyd
11***84Control Group-Pilot Operated Hydraulic1
15***68Control Group-Travel1
15***69Control Group-Handle1
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1262138 Head Gp-Pump Control
1241669 Coupling Gp-Pump
1232011 Cover Gp-Pump Control
1540725 Cylinder & Lines Gp-Boom
11***57Lines Group-Boom Cylinder; -Rh1
15***25Cylinder & Lines Group-Boom; (Boom)1
15***27Cylinder & Seal Group-Boom; (Boom)1
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1183956 Cylinder & Lines Gp-Boom
11***56Cylinder & Lines Group-Boom; (Boom)1
11***57Lines Group-Boom Cylinder; -Rh1
11***23Cylinder & Seal Group-Boom; (Boom)1
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1540726 Cylinder & Lines Gp-Boom
11***49Lines Group-Boom Cylinder; -Lh1
15***26Cylinder & Lines Group-Boom; (Boom)1
15***27Cylinder & Seal Group-Boom; (Boom)1
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1183948 Cylinder & Lines Gp-Boom
11***48Cylinder & Lines Group-Boom; (Boom)1
11***49Lines Group-Boom Cylinder; -Lh1
11***23Cylinder & Seal Group-Boom; (Boom)1
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1540742 Cylinder & Lines Gp-Bucket
11***68Lines Group-Bucket Cylinder; (Bucket Cylinder)1
15***42Cylinder & Lines Group-Bucket; (Bucket)1
17***11Cylinder & Seal Group-Bucket; (Bucket)1
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1540771 Cylinder & Lines Gp-Bucket
12***85Lines Group-Bucket Cylinder; (Bucket Cylinder)1
15***71Cylinder & Lines Group-Bucket; (Bucket)1
15***72Cylinder & Seal Group-Bucket; (Bucket)1
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1183966 Cylinder & Lines Gp-Bucket
11***66Cylinder & Lines Group-Bucket; (Bucket)1
11***68Lines Group-Bucket Cylinder; (Bucket Cylinder)1
17***79Cylinder & Seal Group-Bucket; (Bucket)1
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1183950 Cylinder & Lines Gp-Stick
11***50Cylinder & Lines Group-Stick; (Stick)1
11***51Lines Group-Stick Cylinder; (Stick Cylinder)1
11***55Cylinder & Seal Group-Stick; (Stick)1
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1540740 Cylinder & Lines Gp-Stick
11***54Lines Group-Stick Cylinder; (Stick Cylinder)1
15***40Cylinder & Lines Group-Stick; (Stick)1
15***41Cylinder & Seal Group-Stick; (Stick)1
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1183952 Cylinder & Lines Gp-Stick
11***52Cylinder & Lines Group-Stick; (Stick)1
11***53Cylinder & Seal Group-Stick; (Stick)1
11***54Lines Group-Stick Cylinder; (Stick Cylinder)1
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1540733 Cylinder & Lines Gp-Stick
11***51Lines Group-Stick Cylinder; (Stick Cylinder)1
15***33Cylinder & Lines Group-Stick; (Stick)1
15***34Cylinder & Seal Group-Stick; (Stick)1
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1184023 Cylinder & Seal Gp-Boom
11***23Cylinder & Seal Group-Boom; (Boom)1
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1540727 Cylinder & Seal Gp-Boom
15***27Cylinder & Seal Group-Boom; (Boom)1
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1713379 Cylinder & Seal Gp-Bucket
17***79Cylinder & Seal Group-Bucket; (Bucket)1
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1540743 Cylinder & Seal Gp-Bucket
15***43Cylinder & Seal Group-Bucket; (Bucket)1
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1540772 Cylinder & Seal Gp-Bucket
15***72Cylinder & Seal Group-Bucket; (Bucket)1
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1540734 Cylinder & Seal Gp-Stick
15***34Cylinder & Seal Group-Stick; (Stick)1
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1183955 Cylinder & Seal Gp-Stick
11***55Cylinder & Seal Group-Stick; (Stick)1
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1540741 Cylinder & Seal Gp-Stick
15***41Cylinder & Seal Group-Stick; (Stick)1
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1183953 Cylinder & Seal Gp-Stick
11***53Cylinder & Seal Group-Stick; (Stick)1
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0874771 Drive Gp-Auxiliary Pump
1211612 Drive Gp-Pump
1141319 Drive Gp-Swing
1141320 Drive Gp-Swing
1843930 Filter Gp-Hydraulic
18***30Filter Group-Oil; -Hydraulic, Pilot Supply1
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1076995 Filter Gp-Hydraulic
10***95Filter Group-Oil; -Hydraulic Return1
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1262080 Filter Gp-Hydraulic
1262075 Filter Gp-Hydraulic
12***75Filter Group-Oil; -Hyraulic Oil-Hydraulic, Case Drain1
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1843997 Housing Gp-Filter
1282132 Knob As
1282133 Knob As
1211872 Lines Ar-Auxiliary Hydraulic
11***03Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
12***72Lines Ar-Auxiliary Hydraulic1
12***73Stick Group1
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1211876 Lines Ar-Auxiliary Hydraulic
11***04Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
12***76Lines Ar-Auxiliary Hydraulic1
12***77Stick Group1
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1169103 Lines Gp-Auxiliary Hydraulic
11***03Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
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1169104 Lines Gp-Auxiliary Hydraulic
11***04Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
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1426661 Lines Gp-Auxiliary Hydraulic
14***61Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
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1426662 Lines Gp-Auxiliary Hydraulic
14***62Lines Group-Auxiliary Hydraulic; (Auxiliary Hydraulic)1
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1169102 Lines Gp-Auxiliary Hydraulic
11***02Lines Group-Auxiliary Hydraulic1
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1241044 Lines Gp-Boom
1241045 Lines Gp-Boom
1158919 Lines Gp-Boom Cylinder
11***19Lines Group-Boom Cylinder; (Boom Cylinder)1
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1183957 Lines Gp-Boom Cylinder
1183949 Lines Gp-Boom Cylinder
1183968 Lines Gp-Bucket Cylinder
11***68Lines Group-Bucket Cylinder; (Bucket Cylinder)1
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1232085 Lines Gp-Bucket Cylinder
12***85Lines Group-Bucket Cylinder; (Bucket Cylinder)1
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1347154 Lines Gp-Front
1385069 Lines Gp-Front - Part 1 Of 2
1385074 Lines Gp-Front
1385069 Lines Gp-Front - Part 2 Of 2
1158895 Lines Gp-Front - Part 1 Of 2
1158895 Lines Gp-Front - Part 2 Of 2
1192711 Lines Gp-Pilot
1192390 Lines Gp-Pilot
1192782 Lines Gp-Pilot
1192776 Lines Gp-Pilot
1241102 Lines Gp-Pilot
1192391 Lines Gp-Pilot
1347129 Lines Gp-Pilot
1192778 Lines Gp-Pilot
1192393 Lines Gp-Pilot
1158959 Lines Gp-Pump - Part 2 Of 2
1158959 Lines Gp-Pump - Part 1 Of 2
1158887 Lines Gp-Return & Filter - Part 1 Of 2
1158887 Lines Gp-Return & Filter - Part 2 Of 2
1158920 Lines Gp-Return & Filter
11***20Lines Group-Return & Filter; (Return & Filter)1
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1192534 Lines Gp-Stick
4i3964 Lines Gp-Stick
4I***64Lines Group-Stick; -Reach Stick1
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1192533 Lines Gp-Stick
4i3972 Lines Gp-Stick
0875466 Lines Gp-Stick
1183954 Lines Gp-Stick Cylinder
11***54Lines Group-Stick Cylinder; (Stick Cylinder)1
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1183951 Lines Gp-Stick Cylinder
11***51Lines Group-Stick Cylinder; (Stick Cylinder)1
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1262023 Lines Gp-Swing Motor
12***23Lines Group-Swing Motor; (Swing Motor)1
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1158894 Lines Gp-Swing Motor
1192423 Lines Gp-Track Motor
1119950 Valve Gp-Manifold & Reducing
11***50Manifold Group-Control; -Pilot Manifold1
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1163549 Motor & Mtg Gp-Swing
1077028 Motor & Mtg Gp-Travel
1077029 Motor Gp-Travel
1765107 Motor Gp-Swing - Part 1 Of 2
1163550 Motor Gp-Swing
1262028 Motor Gp-Swing - Part 2 Of 2
1262028 Motor Gp-Swing - Part 1 Of 2
1765104 Motor Gp-Swing
1765107 Motor Gp-Swing - Part 2 Of 2
1077037 Mounting Gp-Valve
1196835 Pedal Ar-Third
11***93Lines Group-Pilot1
11***35Pedal Ar-Third1
12***50Film-Instruction; (Travel Controls)1
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6e2746 Plug Gp
6e4816 Plug Gp
6E***46Plug Group-Control Valve1
6E***93Plug Group-Control Valve1
6E***16Plug Group-Control Valve1
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6e4793 Plug Gp
1099501 Pump & Mounting Gp
10***01Pump & Mtg Group-Main Hydraulic1
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1336911 Pump Gp-Gear
12***83Pump Group-Gear; (Gear)1
13***96Pump Group-Gear1
13***11Pump Group-Gear1
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1262083 Pump Gp-Gear
1336896 Pump Gp-Gear
1262073 Pump Gp-Hydraulic
1232233 Pump Gp-Double Piston
0874780 Rotating Gp-Pump
0874782 Rotating Gp-Pump
0874781 Rotating Gp-Pump
4i6263 Rotor Gp-Swivel
1076996 Screen Gp
1597841 Swivel Gp
1183998 Tank & Filter Gp-Hydraulic - Part 2 Of 2
1183998 Tank & Filter Gp-Hydraulic - Part 1 Of 2
1183984 Tank & Mtg Gp-Hydraulic
1232422 Valve Ar-2 Way
12***00Film Group; -Alternate Pattern Control1
12***22Valve Ar-2 Way1
12***02Lines Group-Pilot1
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1153127 Valve Ar-Check & Relief
11***27Valve Ar-Check & Relief1
11***19Lines Group-Boom Cylinder; (Boom Cylinder)1
11***20Lines Group-Return & Filter; (Return & Filter)1
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1163551 Valve Ar-Swing
11***76Wiring Group-Fine Swing1
11***51Valve Ar-Swing1
12***23Lines Group-Swing Motor; (Swing Motor)1
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4i6363 Valve As-Ball
4I***63Valve As-Ball; (1-Pump/2-Pump Flow)1
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6c6746 Valve Gp
1425516 Valve Gp-Check
1843831 Valve Gp-Check
18***31Valve Group-Check; -Slow Return1
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4i0890 Valve Gp-Check
7i8136 Valve Gp-Check
4i5525 Valve Gp-Check
4i6301 Valve Gp-Check & Relief
1184205 Valve Gp-Check & Relief
1540530 Valve Gp-Control - Part 1 Of 2
1540530 Valve Gp-Control - Part 2 Of 2
1077071 Valve Gp-Control - Part 1 Of 2
1163470 Valve Gp-Control
1163471 Valve Gp-Control
1540533 Valve Gp-Control
1077076 Valve Gp-Control
1077074 Valve Gp-Control - Part 1 Of 2
1077074 Valve Gp-Control - Part 2 Of 2
1077071 Valve Gp-Control - Part 2 Of 2
1540532 Valve Gp-Control
1077073 Valve Gp-Control
1540531 Valve Gp-Control
15***31Valve Group-Control1
15***32Valve Group-Control; (Control)1
15***33Valve Group-Control; (Control)1
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1077075 Valve Gp-Control
10***75Valve Group-Control1
10***76Valve Group-Control; (Control)1
11***71Valve Group-Control; (Control)1
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1077072 Valve Gp-Control
10***72Valve Group-Control1
10***73Valve Group-Control; (Control)1
11***70Valve Group-Control; (Control)1
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4i7836 Valve Gp-Flow Control
4I***36Valve Group-Flow Control; -Pilot Oil-Drain, Boom Ii1
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5i8706 Valve Gp-Flow Control
1540529 Valve Gp-Main Control
1077070 Valve Gp-Main Control
1384243 Valve As-Ball
1384244 Valve As
1371594 Valve As-Ball
13***94Valve Group-Manual1
13***43Valve Group-Manual1
13***44Valve Group-Manual1
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1557067 Valve Gp-Pilot
15***67Valve Group-Pilot; (Stick Drift Reduction)1
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1232148 Valve Gp-Pilot
12***48Valve Group-Pilot; -Platform Travel1
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1764984 Valve Gp-Pilot
17***84Valve Group-Pilot; -Joystick-Implement, Swing1
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1195219 Valve Gp-Pilot
11***19Valve Group-Pilot; -1-Pump, 2-Pump, Boom Priority1
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1232604 Valve Gp-Pilot
12***04Valve Group-Pilot; -Third Pedal, Straight Travel1
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1185984 Valve Gp-Pilot
11***84Valve Group-Pilot; -Alt Pattern Control, 2-Way1
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1232419 Valve Gp-Pilot
12***19Valve Group-Pilot; -Boom Lowering, Drift Reduction1
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1315914 Valve Gp-Pilot
13***14Valve Group-Pilot; (Implement, Swing)1
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1183917 Valve Gp-Pilot
1232146 Valve Gp-Pilot
1232147 Valve Gp-Pilot
1020871 Valve Gp-Pilot Relief
6e4281 Valve Gp-Pressure Control
1262139 Head Gp-Pump Control
1262136 Head Gp-Pump Control
1163600 Valve Gp-Relief
11***00Valve Group-Relief; -Line-Grapple1
11***01Oil Line; (Sub For Ffsb115155), Valve Group-Relief; -Line, Boom Cylinder Head End1
11***10Valve Group-Relief; -Line, Boom Cylinder Head End1
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1540401 Valve Gp-Relief
1092667 Valve Gp-Relief
10***67Valve Group-Relief; -Negative Flow Control1
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1232433 Valve Gp-Relief
1298030 Valve Gp-Relief
6e1547 Valve Gp-Pilot Relief
1163601 Valve Gp-Pilot Relief
11***01Oil Line; (Sub For Ffsb115155), Valve Group-Relief; -Line, Boom Cylinder Head End1
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1710030 Valve Gp-Relief
17***30Valve Group-Relief; -Work Tool Supply Oil1
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7i7968 Valve Gp-Relief
1095152 Valve Gp-Relief
10***52Valve Group-Relief; -Negative Flow Control1
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1597732 Valve Gp-Relief
1185410 Valve Gp-Relief
11***10Valve Group-Relief; -Line, Boom Cylinder Head End1
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1765105 Valve Gp-Relief
1077058 Valve Gp-Selector
10***58Valve Group-Selector; -Hydraulic Activation Control1
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1232430 Valve Gp-Shuttle
12***30Valve Group-Shuttle; (Work Tool)1
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1232549 Valve Gp-Shuttle
1120083 Valve Gp-Shuttle
11***83Valve Group-Shuttle; -Third Pedal, Straight Travel1
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1163526 Valve Gp-Solenoid
11***26Valve Group-Solenoid; -Swing Cushion1
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1373637 Valve Gp-Solenoid
1119916 Valve Gp-Press Reducing Sol
11***16Valve Group-Solenoid; -Grapple Signal-Ground Saw, Grapple Control1
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1077056 Valve Gp-Solenoid
10***56Valve Group-Solenoid; -Anti-Reaction, Fine Swing1
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1315759 Valve Gp-Solenoid
13***59Valve Group-Solenoid; (Solenoid)1
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1211491 Valve Gp-Solenoid
12***91Valve Group-Solenoid; -Hydraulic Activation Control1
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1315744 Valve Gp-Solenoid
13***44Valve Group-Solenoid; (Solenoid)1
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1211490 Valve Gp-Solenoid
12***90Valve Group-Solenoid; -Travel1
13***44Valve Group-Solenoid; (Solenoid)1
13***59Valve Group-Solenoid; (Solenoid)1
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1163420 Valve Gp-Cushion Crossover Rlf
11***20Valve Group-Swing Cushion; -Anti-Reaction, Fine Swing1
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1373718 Valve Gp-Traction Control
13***18Valve Group-Travel Counterbalance1
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Implements
7y3475 Adjuster Gp-Bucket
7Y***75Adjuster Group-Bucket; -C-Family1
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7y2219 Adjuster Gp-Bucket
7Y***19Adjuster Group-Bucket; -B-Family1
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1276021 Adjuster Gp-Bucket
12***21Adjuster Group-Bucket; (Bucket)1
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1317661 Boom Ar-1 Piece
11***57Lighting Group-Boom; -Lh1
11***98Boom Group1
11***99Lines Group-Grease; (Grease)1
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1680552 Boom Ar-1 Piece Long
11***57Lighting Group-Boom; -Lh1
11***97Lines Group-Grease; (Grease)1
12***44Lines Group-Boom; (Boom)1
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1317660 Boom Ar-1 Piece
13***60Boom Ar1
13***61Boom Ar; (1 Piece)1
15***25Cylinder & Lines Group-Boom; (Boom)1
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1317659 Boom Ar-1 Piece
11***57Lighting Group-Boom; -Lh1
11***96Boom Group; Boom Gp -B1
11***97Lines Group-Grease; (Grease)1
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1174140 Boom Ar-1 Piece Long
11***57Lighting Group-Boom; -Lh1
11***40Boom Ar-1 Piece Long1
11***96Boom Group; Boom Gp -B1
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1317658 Boom Ar-1 Piece
13***58Boom Ar-Long1
13***59Boom Ar1
15***25Cylinder & Lines Group-Boom; (Boom)1
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1174141 Boom Ar-Short
11***57Lighting Group-Boom; -Lh1
11***41Boom Ar-Short1
11***98Boom Group1
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1175496 Boom Gp
1175498 Boom Gp
1680553 Boom Gp
6i5012 Bucket & Adjuster Gp
5I***44Bucket As; -C-Family1
6I***12Bucket & Adjuster Group; -Excavation, B-Family1
7Y***75Adjuster Group-Bucket; -C-Family1
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6i5014 Bucket & Adjuster Gp
6I***14Bucket & Adjuster Group1
7Y***75Adjuster Group-Bucket; -C-Family1
7Y***92Bucket As; (Mass Excavation)1
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1162017 Bucket & Adjuster Gp
11***17Bucket & Adjuster Group1
11***18Bucket As-Trenching1
7Y***75Adjuster Group-Bucket; -C-Family1
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1488829 Bucket & Adjuster Gp
14***29Bucket & Adjuster Group; -Heavy-Duty, B-Family1
14***32Bucket As-Excavation; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1097589 Bucket & Adjuster Gp
10***87Bucket As-Excavation; (Excavation)1
10***89Bucket & Adjuster Group1
12***21Adjuster Group-Bucket; (Bucket)1
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1422542 Bucket & Adjuster Gp
14***42Bucket & Adjuster Group; -Heavy-Duty Rock, B-Family1
14***49Bucket As-Heavy Duty Rock; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1272284 Bucket & Adjuster Gp
12***84Bucket & Adjuster Group1
12***85Bucket As-Excavation1
7Y***75Adjuster Group-Bucket; -C-Family1
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1422541 Bucket & Adjuster Gp
14***41Bucket & Adjuster Group1
14***48Bucket As-Excavation1
7Y***19Adjuster Group-Bucket; -B-Family1
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1422543 Bucket & Adjuster Gp
14***43Bucket & Adjuster Group; -Heavy-Duty, B-Family1
14***50Bucket As-Excavation; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1422540 Bucket & Adjuster Gp
14***40Bucket & Adjuster Group1
14***47Bucket As-Heavy Duty Rock1
7Y***19Adjuster Group-Bucket; -B-Family1
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1422545 Bucket & Adjuster Gp
14***45Bucket & Adjuster Group; -Excavation, B-Family1
14***52Bucket As-Excavation; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1422544 Bucket & Adjuster Gp
14***44Bucket & Adjuster Group; -Heavy-Duty Rock, B-Family1
14***51Bucket As-Heavy Duty Rock; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1272291 Bucket & Adjuster Gp
12***91Bucket & Adjuster Group; -Extreme Service Rock, C-Family1
12***92Bucket As-Excavation; -C-Family1
7Y***75Adjuster Group-Bucket; -C-Family1
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1102116 Bucket & Adjuster Gp
11***13Bucket As1
11***16Bucket & Adjuster Group1
7Y***19Adjuster Group-Bucket; -B-Family1
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6i5013 Bucket & Adjuster Gp
5I***35Bucket As; (Excavation)1
6I***13Bucket & Adjuster Group1
7Y***75Adjuster Group-Bucket; -C-Family1
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1102117 Bucket & Adjuster Gp
11***14Bucket As; -B-Family1
11***17Bucket & Adjuster Group; -Excavation, B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1422546 Bucket & Adjuster Gp
14***46Bucket & Adjuster Group; -Heavy-Duty Rock, B-Family1
14***53Bucket As-Heavy Duty Rock; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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1488828 Bucket & Adjuster Gp
14***28Bucket & Adjuster Group; -Excavation, B-Family1
14***31Bucket As-Excavation; -B-Family1
7Y***19Adjuster Group-Bucket; -B-Family1
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5i3444 Bucket As-Excavation
7y7592 Bucket As-Mass Excavation
1102113 Bucket As-Excavation
1102114 Bucket As-Excavation
5i3335 Bucket As-Excavation
1422550 Bucket As
14***50Bucket As-Excavation; -B-Family1
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1488832 Bucket As
14***32Bucket As-Excavation; -B-Family1
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1488831 Bucket As
14***31Bucket As-Excavation; -B-Family1
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1422548 Bucket As
1272292 Bucket As
12***92Bucket As-Excavation; -C-Family1
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1422552 Bucket As
14***52Bucket As-Excavation; -B-Family1
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1028287 Bucket As-Excavation
10***87Bucket As-Excavation; (Excavation)1
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1272285 Bucket As
1422551 Bucket As
14***51Bucket As-Heavy Duty Rock; -B-Family1
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1422547 Bucket As
1422549 Bucket As
14***49Bucket As-Heavy Duty Rock; -B-Family1
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1422553 Bucket As
14***53Bucket As-Heavy Duty Rock; -B-Family1
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1162018 Bucket As
1175499 Lines Gp-Grease
4i0498 Lines Gp-Grease
1175497 Lines Gp-Grease
1174142 Linkage Ar-Bucket
11***42Linkage Ar-Bucket; -B-Family1
11***66Cylinder & Lines Group-Bucket; (Bucket)1
13***33Linkage Group-Bucket; (Bucket)1
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1174143 Linkage Ar-Bucket
11***43Linkage Ar-Bucket1
11***66Cylinder & Lines Group-Bucket; (Bucket)1
13***32Linkage Group-Bucket; (Bucket)1
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1317675 Linkage Ar-Bucket
13***75Linkage Ar-Bucket1
13***32Linkage Group-Bucket; (Bucket)1
15***42Cylinder & Lines Group-Bucket; (Bucket)1
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1370916 Linkage Ar-Bucket
13***34Linkage Group-Bucket; (Bucket)1
13***16Linkage Ar-Bucket1
15***71Cylinder & Lines Group-Bucket; (Bucket)1
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1317674 Linkage Ar-Bucket
13***74Linkage Ar-Bucket1
13***33Linkage Group-Bucket; (Bucket)1
15***42Cylinder & Lines Group-Bucket; (Bucket)1
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1332432 Linkage Gp-Bucket
1332434 Linkage Gp-Bucket
1332433 Linkage Gp-Bucket
7y0366 Sidecutter Gp
7Y***66Sidecutter Group; -C-Family, D-Family1
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1122481 Sidecutter Gp
7y0729 Sidecutter Gp
1263792 Stick Ar-Hoe
12***92Stick Ar-Hoe1
12***11Stick Group-Hoe; (Hoe)1
4I***98Lines Group-Grease; -Stick1
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1680594 Stick Ar-Hoe
08***66Lines Group-Stick; (Stick)1
16***01Stick Group-Hoe; (Hoe)1
16***94Stick Ar-Hoe1
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1263793 Stick Ar-Hoe
08***66Lines Group-Stick; (Stick)1
12***93Stick Ar-Hoe1
12***61Stick Group-Hoe; (Hoe)1
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1204972 Stick Ar-Hoe
11***34Lines Group-Stick; (Stick)1
12***72Stick Ar-Hoe1
12***64Stick Group-Hoe; (Hoe)1
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1263794 Stick Ar-Hoe
12***94Stick Ar-Hoe1
12***62Stick Group-Hoe; (Hoe)1
4I***64Lines Group-Stick; -Reach Stick1
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1204971 Stick Ar-Hoe
11***33Lines Group-Stick; (Stick)1
12***71Stick Ar-Hoe1
12***63Stick Group-Hoe; (Hoe)1
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1211873 Stick Gp
1211877 Stick Gp
1271162 Stick Gp-Hoe
1271161 Stick Gp-Hoe
1271163 Stick Gp-Hoe
1271211 Stick Gp-Hoe
1271164 Stick Gp-Hoe
1663201 Stick Gp-Hoe
9w6472 Tip Gp
3g3237 Tip Gp-Penetration
8e0840 Tip Gp
3g3236 Tip Gp-Penetration
4t2215 Tip Gp-Wide
9w6473 Tip Gp-Corner
8e0839 Tip Gp-Corner
8e3756 Tip Gp-Abrasion
8E***56Tip Group-Abrasion; -J-300, Heavy-Duty1
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8e3757 Tip Gp-Abrasion
8E***57Tip Group-Abrasion; -J-350, Heavy-Duty1
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8e0837 Tip Gp-Abrasion
8E***37Tip Group-Abrasion; -J-400, Heavy-Duty1
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8e0834 Tip Gp-Long
8e3751 Tip Gp-Long
8E***51Tip Group-Long; -J-300, Heavy-Duty1
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9j3167 Tip Gp-Long
1270716 Tip Gp-Long
8j4955 Tip Gp-Long
8e3752 Tip Gp-Long
8E***52Tip Group-Long; -J-350, Heavy-Duty1
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6y5472 Tip Gp-Long
6Y***72Tip Group-Long; -J-400, Heavy-Duty1
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9w9188 Tip Gp
9W***88Tip Group-Penetration; -Sharp Center1
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9w9189 Tip Gp-Corner
9W***89Tip Group-Penetration; -Sharp Corner1
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8e0838 Tip Gp-Penetration
8j4954 Tip Gp-Short
1270715 Tip Gp-Short
8e0835 Tip Gp-Short
9j3175 Tip Gp-Short
8j4953 Tip Gp-Wide
8e0836 Tip Gp-Wide
Lubrication System
5i7754 Breather Gp
1252957 Filter Gp-Engine Oil
12***57Filter Group-Engine Oil; (Engine Oil)1
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5i7769 Lines Gp-Engine Oil
5I***69Lines Group-Engine Oil; (Engine Oil)1
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5i8034 Lines Gp-Engine Oil
5I***34Lines Group-Engine Oil; (Engine Oil)1
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1241658 Lines Gp-Drain
5i7770 Lines Gp-Turbocharger Oil
5I***70Lines Group-Turbocharger Oil; (Turbocharger Oil)1
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Operator Station
1116305 Air Conditioner & Mounting Gp
11***05Air Conditioner & Mounting Group1
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1557022 Air Conditioner & Mounting Gp
15***22Air Conditioner & Mounting Group1
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1229681 Air Conditioner Gp
11***89Duct Group-Defroster1
11***91Duct Group-Air1
11***05Air Conditioner & Mounting Group1
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1116413 Air Conditioner Gp
1300250 Air Conditioner Gp
1557021 Air Conditioner Gp
12***48Duct Group-Defroster1
12***49Duct Group-Cab Air1
12***50Duct Group-Air1
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1474811 Air Conditioner Gp
1229602 Arm As-Wiper
1474833 Blower Gp
6i5444 Box Gp-Storage
1557019 Cab Gp (Basic) - Part 1 Of 2
1116293 Cab Gp
1557019 Cab Gp (Basic) - Part 2 Of 2
1116294 Cab Gp (Basic) - Part 2 Of 2
1557020 Cab Gp (Basic) - Part 1 Of 2
1116294 Cab Gp (Basic) - Part 1 Of 2
1244012 Cab Gp
1556995 Cab Gp
1116270 Cab Gp
1557020 Cab Gp (Basic) - Part 2 Of 2
1116271 Cab Gp (Basic) - Part 2 Of 2
1116271 Cab Gp (Basic) - Part 1 Of 2
1540674 Cab Gp
1244013 Cab Gp (Basic) - Part 1 Of 2
1244013 Cab Gp (Basic) - Part 2 Of 2
1099506 Compressor Gp-Refrigerant
1540445 Compressor Gp-Refrigerant
1540440 Condenser & Mtg Gp-Air Cond
15***40Condenser & Mtg Group-Refrigerant1
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1176317 Condenser & Mtg Gp-Air Cond
11***17Condenser & Mtg Group-Refrigerant1
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1116278 Console Gp-Operator
1557084 Console Gp
1116279 Console Gp
1557008 Console Gp
1116280 Console Gp
1557039 Cover Gp
1557027 Cover Gp-Storage
1116277 Cover Gp-Storage
1680746 Distributor As
1557054 Door Gp-Cab
1557053 Door Gp-Cab
4i6973 Door Gp-Cab
4i6974 Door Gp-Cab
1352255 Duct As
1243982 Duct As
1397151 Duct As
4i1170 Duct Gp-Air
4I***70Duct Group-Air; Duct Gp-Air (Basic)1
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1116291 Duct Gp-Air
1282150 Duct Gp-Air
1282149 Duct Gp-Air
1243985 Duct Gp-Air
1397150 Duct Gp-Air
1282148 Duct Gp-Defrost
1116289 Duct Gp-Defrost
1204955 Guard Ar-Vandalism
10***44Box & Mtg Group-Storage1
12***55Guard Ar-Vandalism1
12***07Guard Group-Vandalism1
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1024740 Guard Ar-Vandalism
10***40Guard Ar-Vandalism1
10***44Box & Mtg Group-Storage1
11***21Guard Group-Vandalism1
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1282156 Guard Gp-Window
1116321 Guard Gp-Vandalism
1244007 Guard Gp-Vandalism
1282157 Guard Gp-Window
4i1273 Hatch Gp
4i4204 Hatch Gp
1229648 Headrest As
7y3813 Horn Gp-Electric
1176265 Lever As
1597744 Lever As
15***44Lever Group-Control; (Hydraulic Controls Lockout) (Hydraulic Activation Control)1
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1244029 Lines Gp-Air Conditioner - Part 1 Of 2
1540518 Lines Gp-Air Conditioner - Part 2 Of 2
1540518 Lines Gp-Air Conditioner - Part 1 Of 2
1244029 Lines Gp-Air Conditioner - Part 2 Of 2
7y0059 Literature Gp
09***45Cable; (Lanyard)1
5P***58Sleeve; (Cable Splice)2
5P***00Key Total 2 Pieces Per Unit; (Literature Compartment)2
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1557001 Mirror Gp-Rear View
1089836 Mirror Gp-Rear View
1060176 Monitor Gp-Operator
1229603 Motor As-Windshield Wiper
1133452 Motor As-Windshield Wiper
1540591 Platform Gp-Operator
1116285 Platform Gp-Operator
1400858 Radio Gp-Am/Fm
14***58Radio Group; (Am/Fm)1
14***65Wiring Group-Console; (Console)1
14***67Wiring Group-Radio1
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1597672 Seat As
1540775 Seat As
1229625 Seat Belt Gp
12***25Seat Belt Group; -Retractable, 3-In1
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1243925 Seat Gp
1502200 Seat Gp
1116283 Seat Gp
1116282 Seat Gp
1519617 Seat Gp
1116281 Support Gp-Seat
1300340 Suspension As-Seat
1243926 Suspension Gp-Seat
1116391 Suspension Gp-Seat
4i0559 Tank As-Windshield Washer
8r1774 Bottle Gp-Windshield Washer
1116313 Visor Gp-Sun
6i5387 Visor Gp-Protection-Rain
1116267 Washer Gp-Window
1116316 Washer Gp-Window
1843965 Window Ar-Cab
18***65Window Ar-Cab1
18***03Window Group-Cab1
18***04Film Group; -Cab Window, Rear1
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4i6966 Window As-Door
1843966
1844003 Window Gp-Cab
1557058 Window As-Door
1557045 Window Gp
1116273 Window Gp
1243963 Window Gp
1557043 Window Gp
1116315 Wiper & Washer Gp
11***15Wiper & Washer Group-Window; (Window)1
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1116314 Wiper Ar-Lower
11***95Wiring Group-Window Wiper1
11***14Wiper Ar-Lower1
11***15Wiper & Washer Group-Window; (Window)1
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1557041 Wiper Gp-Window
1116272 Wiper Gp-Window
Power Train
1141337 Fastener Gp-Swing & Final Dr
11***37Fastener Group-Swing & Final Dr1
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1141484 Final Drive Gp - Part 2 Of 2
1141484 Final Drive Gp - Part 1 Of 2
1141483 Final Drive Gp
7y1605 Sprocket Gp-Nonsegmented
Service Equipment And Supplies
1370976 Film Gp
1275248 Film Gp
1205100 Film Gp
12***00Film Group; -Alternate Pattern Control1
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1205094 Film Gp
1275247 Film Gp
1844004 Film Gp
1161603 Plate & Film Gp - Part 2 Of 3
1205118 Plate & Film Gp - Part 1 Of 3
1205119 Plate & Film Gp - Part 1 Of 3
1205118 Plate & Film Gp - Part 3 Of 3
1161603 Plate & Film Gp - Part 3 Of 3
1205119 Plate & Film Gp - Part 2 Of 3
1205118 Plate & Film Gp - Part 2 Of 3
1161603 Plate & Film Gp - Part 1 Of 3
1205095 Film Gp
1205119 Plate & Film Gp - Part 3 Of 3
1205120 Plate & Film Gp - Part 1 Of 3
1205120 Plate & Film Gp - Part 3 Of 3
1205120 Plate & Film Gp - Part 2 Of 3

320B N serial number reference

The PIN plate is a riveted metal tag on the machine frame, usually on the right side of the upper structure near the operator's cab, at or below window height; some earlier units carry a duplicate plate inside the cab near the seat or right foot area. The first three characters of the PIN are the serial number prefix, which ties the machine to a specific model/configuration production run; the digits after that are the sequential build number within that run. Because the 320B family splits into several undercarriage/configuration variants (320B, 320B L, 320B LN, 320B N, 320B S, and others) that share the same engine but carry different prefix blocks, match the full prefix against a 320B-family reference rather than assuming by engine or body style alone.

PrefixIdentifies
2AS320B N (narrow-gauge undercarriage)
4NR320B N (narrow-gauge undercarriage) - confirm with dealer

Frequently asked questions

What engine does the Caterpillar 320B N use?

The 320B N runs the Caterpillar 3066T, a turbocharged inline-six diesel rated at roughly 128 hp (95 kW) net. It is mechanically governed with a Cat fuel injection pump, shared across the 320B, 320B L, and 320B N, and carried forward in updated form into the following 320C.

What is the operating weight of the Caterpillar 320B N?

The 320B N has an operating weight of about 19,930 kg (43,938 lb) in its standard configuration. Other 320B trims range from about 19,800 kg to 21,300 kg (43,700 lb to 47,000 lb) depending on undercarriage and boom/stick setup, so confirm the exact configuration when matching parts or attachments.

What replaced the Caterpillar 320B N?

Caterpillar replaced the 320B family, including the N trim, with the 320C, introduced around 2001 and built into the mid-2000s. The 320C kept the same 3066T engine family but added revised electronics and cooling. This lineage is unrelated to the reintroduced Cat 320 nameplate Caterpillar used on its 2018-and-later Next Generation excavators, which is a different machine despite reusing the model number.

What 320B N owners discuss

What engine does the 320B N actually run, and does the narrow-gauge undercarriage change the powertrain?
The 320B N uses the same Cat 3066T as the other 320B configurations: a turbocharged inline-6 diesel rated around 95 kW (128 hp) net. The "N" suffix marks a narrower track gauge undercarriage, not a different engine or power rating, so power complaints and fixes carried over from other 320B builds generally apply here too. The 3066T is a Mitsubishi-built design with reasonable parts support even on older units. With disciplined oil and filter intervals, owners commonly report engine life reaching into the 10,000-15,000 hour range before liners and pistons need attention; heavy-duty cycles or deferred oil changes pull that number down significantly, so treat any hour figure as a range, not a guarantee.
Why does the whole hydraulic system go soft or sluggish at once instead of one function at a time?
When every hydraulic function loses power together rather than just the boom or stick alone, owners most often trace it to the main pumps themselves: worn swash plates, a scored barrel, or a weak or broken spring inside the pump drop both flow and pressure even though the pump still turns fine. A second recurring cause is the pressure-reducing valve that supplies powershift/pilot pressure to the pump control — when it sticks or leaks off, the pumps never get commanded to full stroke and everything feels weak at once. Check pilot pressure and case drain flow first; that narrows down whether the fix is a valve or a pump teardown before spending money on the wrong repair.
What usually causes a 320B N to run hot after a few hours of work?
The recurring complaint is airflow, not the radiator core itself. Debris packs into the gap between the hydraulic oil cooler and the radiator, and on machines missing the foam seals around that cooler pack, the fan just recirculates already-hot air through the core instead of pulling fresh air across it. A leaking oil cooler hose that soaks the fins in hydraulic oil makes the dirt stick faster. Cleaning only the outward-facing side of the pack rarely fixes it — the assembly needs to be split so both faces of the cooler and radiator get cleaned. If temperatures stay high after a proper cleaning, check for a sheen of oil in the coolant, which points to a cracked oil cooler core letting oil migrate into the coolant side.
One track pulls weak or the machine won't track straight — is that the travel motor?
Not usually, at least not first. On these machines the center swivel joint (the rotary manifold that feeds hydraulic oil from the upper structure down to the travel motors and blade cylinders) tends to start leaking internally somewhere around the 5,000-hour mark. Because the left and right travel circuits share adjacent passages through that joint, a worn seal there causes oil to bypass between circuits, which shows up as a weak-feeling motor, drift to one side, or reduced climbing power — even though the travel motor itself tests fine. Confirm before condemning a motor: tee a gauge into the case drain line and check pressure, which should read low, roughly 0.7-1 bar (10-15 psi); a high reading points back to the swivel joint rather than the motor. Because uneven or unpredictable travel response is a safety issue on grade or near an edge, have your dealer verify swivel joint and travel motor condition before the machine goes back to slope work.
What undercarriage wear pattern should an owner expect on this machine?
Standard medium-excavator wear shows up here too: bottom rollers and idlers seize or flat-spot when grease intervals slip, sprockets wear fastest on the drive side, and track adjuster seals weep grease over time, which lets tension bleed off. Running the track loose or overly tight accelerates pin, bushing, and roller wear regardless of total hours, so tension checks matter as much as the hour meter. Because the N undercarriage runs a narrower gauge and shoe width than the standard or long-gauge 320B variants, replacement rollers, idlers, and shoes need to match that narrower configuration specifically rather than being swapped from a wider-gauge parts source.
What's behind intermittent electrical faults and sensor codes on the 320B N?
Most electrical complaints on these machines trace back to connectors rather than failed parts. A corroded pin or a poorly-crimped terminal inside a harness connector can throw sensor fault codes, kill an accessory circuit like the A/C, or cause intermittent no-starts, even on a connector that looks fine from the outside. Coolant and hydraulic temperature/pressure sensor circuits are frequent offenders, throwing short-to-ground or short-to-battery codes that turn out to be a chafed harness wire rather than a bad sensor. The reliable diagnostic approach is following power from a known-good point wire by wire with the diagnostic code screen live, rather than swapping sensors on a guess.
What should a buyer check before purchasing a used 320B N?
Cold-start it if at all possible — a warm engine can hide hard starting or low compression. Check engine oil for a milky coolant mix and check the coolant itself for an oil sheen, which flags a failing oil cooler core. Cycle every hydraulic function under load and watch for speed sag that suggests worn pump swash plates or barrels rather than just a cold, thick-oil excuse. Tee into the case drain at the center swivel joint and confirm both tracks pull evenly in a straight line under power with no drift. Walk the full undercarriage looking for flat-spotted rollers, sprocket wear, and adjuster seal leaks, and confirm the track gauge and shoe width actually match the narrower N undercarriage rather than mismatched wide-gauge components fitted at some point. Check the boom, stick, and major mounting welds for crack lines hiding under fresh paint, and ask for service records to see whether the hour count lines up with any past rebuild work. Swing parking-brake holding and travel motor cross-leakage are safety items that don't show up on a quick test drive — have your dealer verify both before the machine goes into daily production.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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