Caterpillarmini hydraulic excavator(no series)
Caterpillar 306
Maintenance schedule, common problems & OEM parts breakdown
The Cat 306 is a mini hydraulic excavator in Caterpillar's 6-metric-ton size class, positioned between the 305 CR and the 307.5 in the current mini excavator lineup. The platform runs the Cat C2.4 Turbo diesel, a 2.43-liter four-cylinder rated 41.7 kW (55.9 hp) net at 2200 rpm and 43.2 kW (57.9 hp) gross, meeting Tier 4 Final/Stage V emissions in North America and Europe. Operating weight runs roughly 6.4-7.2 t (14,100-15,800 lb), varying by cab or canopy, standard or long stick, steel or rubber track, and counterweight. Caterpillar introduced the 306 CR (Compact Radius) in 2019 as its first purpose-built 6-ton mini excavator, still in current production, with a 306.5 variant sold in other regions under different local emissions rules on the same engine platform. Configurations include open canopy or sealed cab, compact-radius or standard-tail upper structure, standard or long stick, and steel or rubber undercarriage.
Before the 306 existed, Cat's mini excavator range jumped straight from the 5.5-ton 305.5 to the 7.5-ton-plus 307/308, leaving a gap for buyers who needed more digging force than a 305.5 without stepping up to a much heavier machine. The 306 CR closed that gap with dedicated 6-ton engineering: load-sensing variable-displacement piston-pump hydraulics, standard ROPS/TOPS/Top Guard Level 1 protection, and the hydraulic interlock lockout system shared across Cat's E2/CR-generation mini excavators. Because the C2.4 engine and much of the hydraulic architecture carry over from the smaller 305.5E2 and 305E2 CR machines, service knowledge and wear patterns cross over well within that family. As a comparatively recent model line, used 306 CR units on today's market are still fairly young, so parts demand runs mostly through OEM and dealer channels rather than a mature aftermarket. Buyers should track serial-number prefix carefully, since 306, 306 CR, and 306.5 share overlapping service literature but differ in tail-swing geometry and regional emissions tuning.
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 306 specifications
Engine
| Engine model | Cat C2.4 Turbo, 4-cylinder inline diesel (used across the 306 CR Next Generation line since its 2019 launch; no earlier/non-CR "306" generation documented) |
| Gross power (ISO 14396) | 57.9 hp (43.2 kW), rounded to 58 hp (43 kW) in some literature |
| Net power (ISO 9249) | 55.9 hp (41.7 kW) at 2,200 rpm |
| Displacement | 2.43 L (148 in³) |
| Bore x stroke | 87 mm x 102.4 mm (3.4 in x 4.0 in) |
| Cylinders | 4, turbocharged |
| Emissions tier | Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards |
Weights
| Operating weight, standard (cab) | 15,766 lb (7,150 kg); some spec sheets list up to 15,821 lb (7,175 kg) with the sealed, pressurized cab option |
| Operating weight, minimum (open canopy) | 14,134 lb (6,410 kg) |
| Operating weight, maximum (canopy) | 15,633 lb (7,090 kg) |
| Ground pressure | 5.1-5.7 psi (35-39 kPa), varies by configuration (shoe width, counterweight, cab vs canopy) |
| Transport weight | Not documented as a separate figure from operating weight; the 306 CR is transported as a single unit at its as-configured operating weight |
| Long-undercarriage variant | No LC/long-undercarriage option documented for this model; configuration differences are limited to canopy vs. cab, standard vs. long stick, and counterweight (reduced vs. full swing) |
Dimensions
| Transport length | 234-235 in (5,945-5,970 mm) |
| Transport width (over tracks) | 78 in (1,980 mm) |
| Transport height | 69 in (1,755 mm) with standard stick stowed; up to 95 in (2,410 mm) with long stick, depending on boom transport position |
| Tail swing radius | 53-58 in (1,350-1,475 mm), varies with counterweight option (reduced counterweight vs. full compact-radius counterweight) |
| Track shoe width | 16 in (400 mm) |
| Ground clearance | 12 in (305 mm) |
| Undercarriage length | 102 in (2,591 mm) |
Performance
| Max dig depth, standard stick | 146 in (3,710 mm) |
| Max dig depth, long stick | 162 in (4,110 mm) |
| Max reach at boom pivot, standard/long stick | 248 in (6,295 mm) standard stick; 263 in (6,685 mm) long stick |
| Max reach at ground level, standard/long stick | 241 in (6,120 mm) standard stick; 257 in (6,530 mm) long stick |
| Max dump height, standard/long stick | 170 in (4,320 mm) standard stick; 182 in (4,620 mm) long stick |
| Max cutting height | Not distinctly published apart from max dump height in available spec sheets |
| Max blade (dozer) lift height | 16 in (400 mm) |
| Swing speed | 11 rpm |
| Travel speed | High range 3.1 mph (5.0 km/h); low range 1.7 mph (2.8 km/h) |
| Gradeability | 30 degrees maximum |
| Drawbar pull / max traction force | High speed 6,969 lbf (31 kN); low speed 12,589 lbf (56 kN) |
| Lift capacity | Up to 7,839 lb (3,555 kg) at a 9.8 ft (3 m) radius, per manufacturer lift-performance claim |
Forces
| Bucket digging force | 11,578 lbf (51.5 kN) |
| Stick (arm) digging force, standard stick | 6,632 lbf (29.5 kN) |
| Stick (arm) digging force, long stick | 5,957 lbf (26.5 kN) |
Service capacities (summary)
| Fuel tank | 34.3 gal US (130 L); some listings round to 34 gal US |
| Hydraulic system, total | 27.5-28 gal US (104 L) |
| Hydraulic tank | 14 gal US (53 L) |
| Engine oil | 2.0-2.1 gal US (8 L) |
| Cooling system | 2.6-3 gal US (10 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
306 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 8.0 L (2.1 US gal) | Cat DEO-ULS diesel engine oil — required on this Tier 4 Final / Stage V engine because it runs a diesel particulate filter, which needs a low-ash oil. SAE 10W-30 covers most climates (0°C to 40°C / 32°F to 104°F); step up to SAE 15W-40 in sustained heat; switch to Cat DEO-ULS Cold Weather SAE 0W-40 below about -18°C (0°F). |
| Cooling system | 10.0 L (2.6 US gal) | Cat ELC (Extended Life Coolant), factory-fill, rated to -37°C (-35°F). Never run water alone as coolant. |
| Fuel tank | 130 L (34.3 US gal) | Ultra-low sulfur diesel (ULSD, 15 ppm sulfur max). Blends up to B20 biodiesel are accepted; lockable fuel cap is standard. |
| Hydraulic system total / hydraulic tank | System total: 75 L (19.8 US gal); tank only: 39 L (10.3 US gal) | Cat HYDO Advanced 10 SAE 10W is the factory fill and preferred oil (-20°C to 40°C / -4°F to 104°F). Cat HYDO Advanced 30 SAE 30W suits warmer ranges (0°C to 50°C / 32°F to 122°F); Cat BIO HYDO Advanced covers -30°C to 45°C. Second-choice oils Cat TDTO, Cat MTO, and Cat DEO-ULS are acceptable but give shorter drain intervals. |
| Final drive (each, x2) | Not published in the dealer/OEM sources reviewed for this exact configuration — quantity is small (well under 2 L per side on this weight class). Confirm the exact fill with your dealer using the machine serial number. | Cat GO (Gear Oil) SAE 85W-140, or Cat Synthetic GO SAE 75W-140 for wider temperature range — Caterpillar's standard fill for final drives on this class of mini excavator. |
| Swing drive | Not published in the sources reviewed — confirm with your dealer using the machine serial number. | Cat GO (Gear Oil) SAE 85W-140, or Cat Synthetic GO SAE 75W-140. |
| Pilot / other hydraulic circuits | No separate reservoir — pilot and auxiliary circuits draw from the main hydraulic tank listed above. | Same as hydraulic system: Cat HYDO Advanced 10 or 30, matched to climate. |
| Grease (spec only) | Multiple grease points on boom, stick, bucket linkage, swing bearing, and undercarriage — no single fill quantity applies. | Cat Advanced 3Moly NLGI Grade 2 for general use (-20°C to 40°C / -4°F to 104°F). Cat Arctic Platinum NLGI Grade 0 for extreme cold down to -50°C (-58°F). Cat Desert Gold NLGI Grade 2 for hot climates up to 60°C (140°F). |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 306 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 3,000 h |
|
| Every 6,000 h |
|
Servicing the 306 beyond the schedule
Predictive Maintenance & Fluid Analysis
The C2.4 Turbo's small displacement runs hard through repeated digging cycles, so track wear trends with S.O.S sampling at the engine, hydraulic, final drive, and swing drive ports rather than waiting for symptoms. Watch hydraulic oil condition closely on the load-sensing piston pump system since particulate contamination shows up first as sluggish boom or slew response. Pull an engine oil sample at every 500-hour change to catch turbo or injector wear before it costs a rebuild.
Corrective & Common Repairs
Final drive face-seal leaks are the most common undercarriage repair on the 306 CR, usually traced to debris packed around the drive motor on the compact-radius frame's tighter clearances. Swing bearing play or a rumbling slew shows up when grease intervals slip on the slew ring. Boom and stick cylinder seals wear faster on machines working confined trenches with frequent full-stroke cycling. Check the hydraulic interlock lockout system if attachment controls go dead.
Overhaul & Rebuild Points
Plan undercarriage rebuilds - rollers, idlers, sprockets, track chain - around track sag and wear-strip readings rather than a fixed hour number, since the 306's steel or rubber track options wear at different rates. Swing gear and bearing replacement, hydraulic pump or motor rebuild, and C2.4 valve lash and injector inspection cluster around the 2000-hour-plus range. Budget for turbocharger inspection at the same milestone.
Seasonal & Environment Servicing
Cold-climate 306 CR owners should run winter-grade fuel, check coolant concentration before freeze season, and consider a block heater since the C2.4's small displacement struggles to build heat on short duty cycles. In hot or dusty environments, clean radiator and oil cooler fins more often than the standard interval and keep the cab air filter serviced on pressurized-cab units. Wash undercarriage components regularly in wet, muddy jobsites to keep grit out of final drive face seals.
306 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 099-2257 | Filter Element-Fuel | Fuel system service | Check fitment → |
| 134-8726 | Filter Element As-Air | Air intake service | Check fitment → |
| 150-2128 | Filter Element As-Cab Air | Air intake service | Check fitment → |
| 217-2456 | Filter Element As-Oil | Hydraulic service | Check fitment → |
| 094-9680 | O-Ring, Oil Filter-Oil Cooler | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
306 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 5603-3 | Left travel pedal position sensor, signal circuit voltage above normal | Open or shorted-to-supply wiring at the left travel pedal sensor connector, corrosion in the pedal-assembly connector (common on open-canopy/OROPS units left exposed to weather), or a failed pedal sensor | With key on, check sensor signal and supply voltage at the pedal connector; jumper the signal pin to the return pin — if the code flips to a 4 (voltage below normal) the sensor itself is bad, if it does not flip suspect the harness or connector; joystick travel mode can be used as a temporary workaround |
| 5604-3 | Right travel pedal position sensor, signal circuit voltage above normal | Damaged or corroded right travel pedal sensor wiring/connector, or a failed position sensor | Verify sensor supply (~5V) and signal voltage at the connector, run a jumper test between signal and return to isolate sensor versus harness fault, repair wiring or replace the sensor as needed |
| 5604-4 | Right travel pedal position sensor, signal circuit voltage below normal | Signal wire shorted to ground/return, or internal sensor failure | Inspect the harness near the pedal assembly for chafing or a short to ground; replace the sensor if the wiring checks out clean |
| 110-3 / 110-4 | Engine coolant temperature sensor circuit, voltage above or below normal | Open circuit, corroded connector pins, or a failed coolant temperature sensor on the C2.4 engine | Inspect sensor wiring and connector for corrosion, test sensor resistance against spec at a known temperature, replace the sensor if out of range |
| 100-3 / 100-4 | Engine oil pressure sensor circuit, voltage above or below normal | Failed oil pressure sensor or damaged sensor wiring — this is a sensor circuit fault, not by itself proof of an actual low oil pressure condition | Confirm real oil pressure with a mechanical gauge before condemning the engine, inspect the sensor connector and wiring, replace the sensor if faulty |
| 168-3 / 168-4 | Electrical system (battery) voltage circuit abnormal | Weak or failing battery, loose/corroded battery terminals, faulty alternator, or a charging circuit wiring fault | Load-test the battery, check alternator output and belt condition, clean and tighten battery and ground connections |
| 3251-0 | Diesel particulate filter (DPF) differential pressure above normal — high soot load | Extended low-load or idle operation that prevents normal passive/active regeneration, a clogging filter, or a restricted exhaust | Let an automatic regeneration complete at normal operating rpm and load; if soot load stays high, run a stationary forced regeneration; inspect the DPF if the condition repeats |
| 2458-2 | DPF differential pressure sensor signal erratic, intermittent, or incorrect | Soot- or moisture-blocked sensor pressure tubing, a loose connector, or a failed differential pressure sensor | Clear and inspect the sensor's pressure lines for blockage, check connector pins for corrosion, replace the sensor if the signal stays erratic |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
306 attachments & work tools
Buckets
Pin-on buckets for this 6-ton class use a 45 mm (1.8 in) pin common to the 304-306 mini excavator bucket family. Widths run roughly 300-914 mm (12-36 in); heavy-duty capacity spans about 60 L (2.1 ft3) at 300 mm up to 221 L (7.8 ft3) at 914 mm, with an 18 in HD bucket near 0.09 m3 (3.1 ft3) and a 24 in HD bucket near 0.12 m3 (4.2 ft3). A lightened 12 in general-purpose bucket runs about 0.05 m3. GD/GP buckets trade capacity for lighter weight in dirt/loam, HD buckets add wear plates for mixed clay and semi-rocky material, and dedicated rock buckets use heavier castings and fewer, longer teeth for abrasive or rocky digging. Machine ships standard with a pin-on/manual-coupler front shovel mount; a factory hydraulic pin-grabber coupler is offered as an option for this size class.
Hydraulic hammers
This machine falls in the 6-ton bracket that spans two Cat hammer sizes. The smaller-class hammer is rated for roughly 3-6 ton carriers with an operating weight (with tool) near 345 kg (760 lb) and an impact energy class around 813 J (600 ft-lbf). The next class up is rated for roughly 5-9 ton carriers, operating weight near 390 kg (860 lb) and impact energy near 1,085 J (800 ft-lbf). Being at the top of the lighter class and within range of the next class up, either can be matched depending on duty cycle and desired breaking force; confirm carrier weight and circuit relief settings with the dealer before ordering.
Quick couplers
Factory quick coupler options for this size class are Cat pin-grabber couplers sized for the 5-6 ton mini excavator bracket, offered in both manual (lever-operated) and hydraulic (cab-actuated) versions. A rotating tiltrotator unit built for this weight class is also offered, using an S-type hydraulic coupler on the top (machine) interface and a pin-on or pin-grabber interface on the bottom for swapping buckets, forks, grapples, brooms and compactors.
Thumbs/grapples
Aftermarket hydraulic thumb kits are built to bolt to the factory cylinder mount on the stick with no welding required, typically a two-tine design around 330 mm (13 in) wide running off the auxiliary hydraulic circuit. Demolition and sorting grapples are available as pin-on tools or mounted through the size-matched tiltrotator, useful for brush, debris and material sorting work within this machine's lift and flow limits.
Rippers
Single-tooth ripper attachments using the same 45 mm pin as the bucket family are rated across roughly a 4-8 ton carrier range, sharing fitment with the 305 and 307-size machines. They mount in place of the bucket for frost breaking, hardpan scarifying, or light rock ripping ahead of digging; they are not intended for sustained heavy rock work.
Hydraulic-kit notes
Standard load-sensing hydraulics on this machine include a primary auxiliary circuit rated about 90 L/min (24 gal/min) at 245 bar (3,553 psi) and a secondary auxiliary circuit rated about 33 L/min (9 gal/min) at 245 bar, with selectable one-way, two-way and continuous-flow modes and quick-disconnect lines. This standard flow covers hammers, thumbs, augers, compactors and most hydromechanical tools without a separate high-flow kit; a second auxiliary line is offered as an option for dual-function tools such as tiltrotators or grapples that need independent circuits.
All 306 assemblies by section
Every catalogued assembly group for the Caterpillar 306. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
131-8964 Air Cleaner Gp
| 09***77 | Valve (Evacuation) | 1 |
| 09***28 | Indicator-Air Filter Change; (Air Filter Service) | 1 |
| 13***64 | Air Cleaner Group | 1 |
259-7948 Air Cleaner Gp
| 0A***26 | Fitting | 1 |
| 13***79 | Precleaner Group; -Turbine | 1 |
| 13***64 | Air Cleaner Group | 1 |
123-1499 Extension Gp-Exhaust
| 09***90 | Clamp; (Hose) (26-39mm Id) | 2 |
| 12***99 | Extension Group-Exhaust | 1 |
| 18***50 | Hose | 1 |
259-7947 Lines Gp-Air
| 14***17 | Bolt; (M10x1.25x25-mm) | 1 |
| 19***00 | Pipe As | 1 |
| 19***01 | Clip | 1 |
162-6267 Lines Gp-Muffler Drain
| 13***12 | Stud | 2 |
| 13***51 | Manifold Group-Exhaust | 1 |
| 13***76 | Nut | 8 |
139-7790 Manifold Gp-Exhaust
| 09***30 | Bolt (30mm Long); (30 mm Long) | 8 |
| 13***90 | Manifold Group-Exhaust | 1 |
| 13***22 | Manifold | 1 |
190-5732 Manifold Gp-Inlet
| 09***68 | Clamp Assem. | 1 |
| 09***00 | U-Bolt | 2 |
| 09***23 | Nut | 8 |
190-5740 Muffler Gp
| 19***40 | Muffler Group | 1 |
| 25***74 | Tape | 1 |
| 25***81 | Wire | 1 |
263-9807 Shield Gp-Exhaust
| 09***43 | Pin-Cotter | 1 |
| 09***09 | Nut; (M16x2.0 Thd) | 2 |
| 12***57 | Bracket Assem. | 1 |
Basic Engine
190-5724 Camshaft Gp
| 13***15 | Lock | 16 |
| 13***42 | Camshaft Group | 1 |
| 13***88 | Tappet | 8 |
183-8284 Cover Gp-Valve Mechanism
| 09***32 | Plate | 1 |
| 09***08 | Washer | 2 |
| 09***09 | Rubber | 2 |
190-5723 Crankshaft Gp
| 13***04 | Pin | 1 |
| 13***24 | Key | 2 |
| 19***23 | Crankshaft Group | 1 |
212-8640 Cylinder Block As
| 09***47 | Pin, Dowel | 2 |
| 09***11 | Bushing | 3 |
| 09***65 | Cap (28) | 1 |
212-8638 Cylinder Block Gp
| 09***31 | Gasket, Oil Pipe; Gasket, Pipe Ect | 2 |
| 09***45 | Plug | 2 |
| 09***69 | Bolt; (140-mm Lg) | 3 |
183-8282 Cylinder Head Gp
| 09***62 | Cap | 1 |
| 09***66 | Cap (35) | 1 |
| 09***89 | Bolt (40mm Long); (40-mm Long) | 10 |
139-7777 Flywheel Gp
| 09***93 | Bolt (34mm Long) | 7 |
| 13***77 | Flywheel Group | 1 |
| 13***10 | Gear; (34-mm Long) | 1 |
190-5727 Gear Gp-Front
| 09***18 | Bolt (20mm Long); (20 mm Long) | 2 |
| 09***33 | Bolt; (65-mm Long) | 1 |
| 13***02 | Adjuster | 1 |
139-7778 Housing Gp-Flywheel
| 09***99 | Plug-Dust | 1 |
| 09***35 | Screw; (Machine) (M5x0.8x8mm) | 1 |
| 13***78 | Housing Group-Flywheel | 1 |
190-5726 Housing Gp-Front
| 09***09 | O-Ring, Speed Sensor | 1 |
| 09***51 | Washer-Copper | 2 |
| 09***75 | Bolt; (25-mm Long) | 1 |
131-8965 Mounting Gp-Engine
| 09***61 | Mount-Flexible | 4 |
| 09***62 | Mount-Flexible | 4 |
| 12***39 | Bolt; (M10x1.25x25-mm) | 16 |
178-6471 Pan Gp-Oil
| 09***56 | Gasket, Drain Plug | 1 |
| 09***73 | Bolt (12mm Long); (12 mm Long) | 1 |
| 13***92 | Screw; (M6x1x16-mm) | 1 |
190-5725 Piston & Rod Gp
| 13***27 | Ring | 8 |
| 13***35 | Rod As | 4 |
| 13***97 | Bolt | 8 |
217-5553 Pulley Gp
| 15***71 | Pulley | 1 |
| 19***73 | Washer | 1 |
| 19***74 | Bolt | 1 |
125-1657 Pulley Gp-Idler
| 12***45 | Pulley As | 1 |
| 12***46 | Cover | 1 |
| 12***57 | Pulley Group-Idler | 1 |
Cooling System
147-7149 Cooler Gp-Engine Oil
| 09***36 | Gasket | 2 |
| 09***23 | Nut | 4 |
| 09***80 | O-Ring, Oil Filter-Oil Cooler | 3 |
190-5731 Fan Gp-Suction
| 09***54 | Bolt (16mm Long); (16-mm Long) | 4 |
| 09***90 | Bolt (70mm Long) | 4 |
| 19***31 | Fan Group-Suction | 1 |
190-5730 Lines Gp-Water
| 09***54 | Bolt (16mm Long); (16-mm Long) | 1 |
| 09***38 | Plug | 2 |
| 13***11 | Seal | 3 |
190-5729 Pump Gp-Water
| 09***06 | Bolt (80mm Long); (80 mm Long) | 4 |
| 13***26 | Seal | 1 |
| 19***29 | Pump Group-Water | 1 |
266-2645 Radiator & Hyd Oil Cooler Gp -With Reservoir
| 08***07 | Tank As-Coolant; (Recovery) | 1 |
| 08***13 | Tank; (Radiator) | 1 |
| 08***14 | Cap As-Coolant Tank; (Recovery) | 1 |
267-1072 Radiator & Hyd Oil Cooler Gp
| 09***34 | Bolt; (Wing) (M6x1.0x15mm) | 2 |
| 09***35 | Clamp | 3 |
| 12***74 | Valve-Drain | 1 |
Electrical And Starting System
267-8121 Alarm Gp-Travel
| 16***39 | Alarm As | 1 |
| 19***25 | Harness As-Switch; (Travel Pressure) | 1 |
| 19***28 | Switch As-Rocker; (Travel Alarm) | 1 |
271-5865 Alarm Gp-Travel
| 13***17 | Stator | 1 |
| 13***19 | Screw | 1 |
| 13***20 | Screw | 1 |
201-3906 Alternator Gp-Charging
| 11***37 | Clip | 4 |
| 13***05 | Strap As; (Ground) | 1 |
| 13***86 | Cover-Shield | 1 |
139-7850 Alternator Gp-Charging
| 09***25 | Nut | 1 |
| 09***89 | Bolt (40mm Long); (40-mm Long) | 1 |
| 13***20 | Nut | 1 |
260-5269 Battery & Wiring Gp
| 09***30 | Screw-Machine; (M4x0.07x6-mm) | 2 |
| 12***22 | Diode | 1 |
| 14***50 | Relay; (24-Volt)(Hydraulic Lock, Quick Cplr, Supply) | 1 |
271-5866 Box Gp-Junction -Travel Alarm
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 2 |
| 27***66 | Box Group-Junction; -Travel Alarm | 1 |
| 6V***92 | Screw-Machine; (M4x0.7x25-mm) | 2 |
143-1617 Lamp Gp-Flood
| 14***17 | Lamp Group-Flood; -Boom, Lh-Boom, Rh | 1 |
| 18***35 | Lamp Group-Flood | 1 |
| 21***34 | Bracket | 1 |
267-8114 Lighting Gp-Cab
| 14***17 | Lamp Group-Flood; -Boom, Lh-Boom, Rh | 1 |
| 26***27 | Bracket | 1 |
| 26***14 | Lighting Group-Cab | 1 |
266-2626 Lighting Gp-Flood -Boom, Lh
| 09***11 | Bolt (L=40mm) | 2 |
| 13***41 | Plug; (Glow) | 4 |
| 13***35 | Plate | 1 |
185-9157 Starting Motor Gp-Electric
| 18***57 | Starting Motor Group-Electric | 1 |
| 6V***62 | Screw-Machine; (8-32x0.31-In) | 4 |
| 7T***99 | Nut-Mounting; (1-32-Thd) | 1 |
147-7153 Starting Motor Gp-Electric
| 09***50 | Stopper Set | 1 |
| 09***10 | Bearing | 1 |
| 12***40 | Washer As | 1 |
9g-7641 Switch Gp-Start -Engine, Key
| 27***09 | Harness As-Cab; (Main) | 1 |
| 27***10 | Harness As-Cab; (Wiper Motor) | 1 |
| 27***11 | Clip | 2 |
274-3518 Wiring Gp-Cab
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***96 | Timer As; (Glow Plug) | 1 |
| 12***24 | Connector | 1 |
266-2655 Wiring Gp-Console
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 18***36 | Socket-Connector; (16-Ga To 18-Ga) | 4 |
338-7021 Wiring Gp-Fuel Pump
| 09***75 | Seal - O-Ring (7.80 mm Id) | 1 |
| 09***80 | Seal-O-Ring (Id=11.80mm) | 2 |
| 09***82 | Seal-O-Ring (Id=13.80mm) | 3 |
Engine Arrangement
271-5893 Engine Ar
| 19***77 | Switch-Temperature; (Engine Coolant) | 1 |
| 27***93 | Engine Ar | 1 |
| 32***21 | Engine Ar | 1 |
320-3421 Engine Ar
| 13***77 | Flywheel Group | 1 |
| 13***78 | Housing Group-Flywheel | 1 |
| 13***90 | Manifold Group-Exhaust | 1 |
259-7946 Installation Ar-Engine
| 12***99 | Extension Group-Exhaust | 1 |
| 13***65 | Mounting Group-Engine | 1 |
| 16***67 | Lines Group-Muffler Drain | 1 |
Frame And Body
318-3541 Box Gp-Fuel Transfer
| 09***43 | Pin-Cotter | 1 |
| 09***80 | Pin; (Clevis) | 1 |
| 18***80 | Seal; (8.8-cm) | 0 |
296-1179 Box Gp-Fuel Transfer
| 27***71 | Cam-Latch | 1 |
| 27***72 | Latch As | 1 |
| 29***79 | Box Group-Fuel Transfer | 1 |
351-0205 Box Gp-Storage -Fuel Transfer
| 10***10 | Hinge | 1 |
| 19***86 | Washer; (23x32x1.6-mm Thk) | 1 |
| 22***92 | Lock As | 1 |
351-0206 Box Gp-Storage
| 09***18 | Nut (M6x1.0 Thd) | 4 |
| 14***63 | Hinge | 2 |
| 17***13 | Liner | 1 |
318-3544 Box Gp-Storage
| 10***49 | Spacer; (22x40x22-mm Thk) | 4 |
| 10***67 | . Plate; Swash, Shim (1.0mm Thick), Plate | 4 |
| 10***68 | Shim (1.6mm Thick) | 4 |
259-7931 Counterweight Gp
| 09***18 | Nut (M6x1.0 Thd) | 4 |
| 14***63 | Hinge | 2 |
| 17***13 | Liner | 1 |
259-6541 Cover Gp-Access -Air Filter, Battery
| 25***41 | Cover Group-Access; -Air Filter, Battery | 1 |
| 25***50 | Plate-Cover | 1 |
| 26***71 | Channel | 1 |
297-8607 Cover Gp-Access
| 08***94 | Shim (2.0mm Thick) | 3 |
| 13***73 | Bolt As; (M12x1.75x25-mm) | 15 |
| 13***75 | Bolt As-Locking; (M12x1.75x30-mm)(M12x1.75x30-mm)) | 2 |
297-8604 Cover Gp-Access
| 19***86 | Washer; (23x32x1.6-mm Thk) | 1 |
| 22***92 | Lock As | 1 |
| 22***21 | Cam | 1 |
271-5864 Cover Gp-Side
| 13***74 | Bolt As; (M12x1.75x25-mm) | 19 |
| 26***94 | Sheet | 1 |
| 26***95 | Sheet | 1 |
259-7934 Cover Gp-Side
| 09***65 | Grommet | 1 |
| 12***96 | Seal; (1.084m) | 0 |
| 20***16 | Seal; (120-cm) | 0 |
259-7935 Firewall Gp
| 14***80 | Washer; (10.5x32x3.2-mm Thk) | 1 |
| 17***96 | Tube | 2 |
| 25***35 | Firewall Group | 1 |
338-7041 Frame Gp-Upper
| 27***21 | Cover | 1 |
| 33***41 | Frame Group-Upper | 1 |
| 7X***48 | Bolt; (M12x1.75x16-mm) | 2 |
259-7933 Guard Gp-Bottom
| 25***33 | Guard Group-Bottom | 1 |
| 26***93 | Cover | 1 |
| 8T***23 | Washer-Hard; (13.5x25.5x3-mm Thk)(Bolt To Shield) | 4 |
266-2625 Guard Gp-Cylinder -Boom
| 08***96 | Shim (0.5mm Thick) | 4 |
| 10***73 | Rod | 2 |
| 13***62 | Liner | 1 |
267-8124 Guard Gp-Cylinder -Blade
| 09***17 | Screw-Machine; (M6x1x12-mm)(M6x1x12mm) | 4 |
| 09***18 | Nut (M6x1.0 Thd) | 4 |
| 13***34 | Cover | 1 |
267-8123 Guard Gp-Swivel
| 19***18 | Insulation | 1 |
| 26***10 | Insulation | 1 |
| 26***11 | Insulation | 1 |
259-7938 Hood & Guard Gp
| 12***65 | Adapter | 1 |
| 20***79 | Tube; (15-Dm) | 0 |
| 25***38 | Hood & Guard Group | 1 |
260-8884 Hood Gp-Engine
| 16***66 | Liner | 1 |
| 26***84 | Hood Group-Engine | 1 |
| 26***48 | Liner | 1 |
266-2652 Hood Gp-Engine
| 09***04 | Seal-O-Ring (Id=39.70mm) | 1 |
| 09***94 | Ring-Backup | 1 |
| 12***63 | Piston | 1 |
266-2671 Lines Gp-Grease
| 09***04 | Seal-O-Ring (Id=39.70mm) | 1 |
| 09***94 | Ring-Backup | 1 |
| 12***63 | Piston | 1 |
260-5254 Suppression Gp-Sound -Counterweight
| 15***05 | Cover | 1 |
| 15***06 | Cover | 2 |
| 15***07 | Cover | 2 |
Fuel System
259-7932 Control Gp-Governor
| 09***26 | Bolt; (M14x1.5x26-mm) | 2 |
| 09***22 | Packing | 4 |
| 09***01 | Bolt (L=50mm) | 2 |
190-5736 Filter Gp-Fuel
| 09***19 | Seal-O-Ring (Id=15.80mm) | 4 |
| 19***36 | Filter Group-Fuel | 1 |
| 23***58 | Block | 2 |
223-3095 Gauge Gp-Sight -Fuel Level
| 08***92 | Nut | 1 |
| 08***01 | Washer | 2 |
| 08***32 | Bolt (18mm Long) | 1 |
205-6654 Governor Gp
| 08***29 | Clamp | 2 |
| 08***57 | Clamp | 3 |
| 09***10 | Protector | 2 |
260-8880 Lines Gp-Fuel
| 12***79 | Shim (T=1.350mm) | 1 |
| 13***91 | Shim | 1 |
| 13***92 | Shim (T=1.450mm) | 1 |
190-5737 Lines Gp-Fuel
| 09***68 | Grommet | 1 |
| 09***86 | Clamp; (Hose) | 4 |
| 19***37 | Lines Group-Fuel | 1 |
151-6586 Nozzle Gp-Unit Injector
| 09***24 | Nut | 1 |
| 09***73 | Bolt (12mm Long); (12 mm Long) | 1 |
| 09***32 | Bolt (60mm Long); (60-mm Long) | 1 |
162-6249 Pump Gp-Fuel Injection
| 16***49 | Pump Group-Fuel Injection | 1 |
| 19***83 | Valve As; (Foot) | 1 |
| 23***11 | Plug As-Connector; (2-Pin) | 1 |
151-6587 Pump Gp-Fuel Injection
| 08***83 | Pump | 1 |
| 08***02 | Shim (T=2.0mm) | 1 |
| 08***21 | Washer | 4 |
296-1178 Pump Gp-Fuel Transfer
| 09***86 | Clamp; (Hose) | 2 |
| 09***88 | Clamp; (Hose) | 1 |
| 09***61 | Strap; (Cable) | 1 |
266-2630 Separator Gp-Water
| 17***87 | Spacer; (17x35x56.5-mm Thk) | 4 |
| 26***30 | Separator Group-Water | 1 |
| 33***23 | Tank Group-Fuel | 1 |
338-7022 Tank & Mtg Gp-Fuel
| 00***64 | End; (Hose) | 1 |
| 00***83 | Nipple-Pipe; (Hexagon) | 1 |
| 08***81 | Cap As; (Fuel Tank)(Fuel Tank) | 1 |
338-7023 Tank Gp-Fuel
| 27***65 | Alarm Group-Travel | 1 |
| 27***33 | Lines Group-Pilot; -Travel Alarm | 1 |
| 33***23 | Tank Group-Fuel | 1 |
Hydraulic System
087-4454 Accumulator Gp-Hydraulic -Charged
| 08***54 | Accumulator Group-Hydraulic; -Charged-Pilot Oil | 1 |
| 09***74 | Seal-O-Ring (Id=6.8mm); (Id=6.80mm) | 1 |
| 09***05 | Bolt-Socket Head; (M14x2x40-mm) | 3 |
087-4456 Accumulator Gp-Hydraulic -Charged
| 08***56 | Accumulator Group-Hydraulic; -Charged-Pilot Oil | 1 |
| 24***25 | Lever Group-Control; -2-Way Pattern | 1 |
| 26***58 | Film Group; -Control Pattern | 1 |
145-5106 Accumulator Gp-Hydraulic -Charged
| 14***06 | Accumulator Group-Hydraulic; -Charged | 1 |
| 20***93 | Plug As | 2 |
| 26***85 | Film Group; -Work Tool | 1 |
4i-1536 Accumulator Gp-Hydraulic -Charged
| 09***84 | Seal-O-Ring (Id=15.80mm) | 3 |
| 09***91 | Seal-O-Ring (Id=22.10mm) | 2 |
| 10***01 | Spring-Disc | 8 |
5i-8416 Accumulator Gp-Hydraulic -Charged
| 09***65 | Pin, Dowel | 3 |
| 10***66 | Piston Assem. | 1 |
| 10***68 | Retainer | 1 |
309-6631 Actuator Gp-Pump -Piston
| 09***93 | Seal As | 1 |
| 16***72 | Bolt; (M10x1.5x16-mm) | 1 |
| 16***73 | Washer; (10.5x21x2-mm Thk) | 1 |
274-5945 Actuator Gp-Pump -Spring
| 09***88 | Bolt-Special | 3 |
| 09***44 | Coupling | 1 |
| 10***48 | Hub | 1 |
274-5943 Barrel Gp-Pump
| 17***73 | Ring | 1 |
| 17***74 | Ring | 1 |
| 17***75 | Ring | 2 |
274-5944 Block Gp-Hydraulic
| 15***49 | Bushing | 2 |
| 17***83 | Screw | 1 |
| 17***84 | Ball | 1 |
278-8522 Control Ar-Auxiliary -Work Tool
| 09***55 | Pin-Spring; (20 mm Long) | 3 |
| 15***84 | Collar | 1 |
| 15***85 | Ring | 1 |
267-8120 Control Ar-Auxiliary -2-Way
| 09***92 | Seal-O-Ring (Id=23.70mm) | 1 |
| 14***66 | Bushing | 2 |
| 17***73 | Ring | 1 |
102-3747 Coupling Gp-Pump
| 08***68 | Bolt; (M14x2x40-mm) | 18 |
| 10***47 | Coupling Group-Pump; -Piston | 1 |
| 7X***10 | Washer-Hard; (15.5x29x3-mm Thk) | 18 |
205-0477 Cylinder Gp-Blade
| 09***19 | Seal-O-Ring (Id=15.80mm) | 4 |
| 20***77 | Guide; Hose, Cylinder Group-Blade, Guide | 1 |
| 23***57 | Pipe | 1 |
259-7926 Cylinder Gp-Boom
| 25***26 | Cylinder Group-Boom | 1 |
| 27***42 | Swashplate Group | 1 |
215-2232 Cylinder Gp-Bucket
| 20***29 | Lines Group-Travel Motor | 1 |
| 21***32 | Cylinder Group-Bucket | 1 |
| 25***55 | Tank & Mtg Group-Hydraulic | 1 |
191-1959 Cylinder Gp-Stick
| 09***28 | Screw; (Machine) (M4x0.7x12mm) | 2 |
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 2 |
| 14***46 | Knob | 2 |
170-8873 Drive Gp-Swing
| 17***73 | Drive Group-Swing | 1 |
| 20***41 | Cap | 1 |
| 24***31 | Lever As | 1 |
155-6883 Fastener Gp-Swing & Final Dr
| 09***68 | Bolt, Hexagon Socket | 2 |
| 15***83 | Fastener Group-Swing & Final Dr | 1 |
| 15***91 | Connector-Special | 1 |
227-0620 Gauge Gp-Sight -Hydraulic Oil Level
| 22***20 | Gauge Group-Sight; -Hydraulic Oil Level | 1 |
| 29***80 | Lines Group-Auxiliary Hydraulic; -Boom, Stick | 1 |
194-9981 Housing Gp-Pump
| 09***91 | Clamp, Single | 2 |
| 15***17 | Cap-Dust | 1 |
| 15***18 | Cap-Dust | 1 |
259-7952 Hydraulic Ar
| 20***63 | Elbow As | 4 |
| 25***52 | Hydraulic Ar | 1 |
| 31***33 | Hose As | 2 |
248-5625 Lever Gp-Control -2-Way
| 14***47 | Nut; (M10x1.15-Thd) | 2 |
| 19***86 | Guard | 1 |
| 20***56 | Connector As | 4 |
203-3602 Lever Gp-Control -Travel
| 09***94 | Clamp, Double | 1 |
| 20***56 | Connector As | 2 |
| 20***02 | Lever Group-Control; -Travel | 1 |
297-8580 Lines Gp-Auxiliary Hydraulic
| 16***74 | Valve Group-Selector; -Joystick Pattern | 1 |
| 19***83 | Bracket As | 1 |
| 20***22 | Connector As | 2 |
263-1878 Lines Gp-Auxiliary Hydraulic -Main Control Valve
| 15***45 | Connector | 1 |
| 16***78 | Valve Group-Pilot; -Work Tool-Swing | 1 |
| 20***24 | Connector As | 4 |
278-9924 Lines Gp-Auxiliary Hydraulic -Front
| 08***56 | Accumulator Group-Hydraulic; -Charged-Pilot Oil | 1 |
| 14***11 | Adapter Group | 1 |
| 15***70 | Manifold | 1 |
261-1201 Lines Gp-Blade
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***16 | Fitting | 2 |
| 13***48 | Switch As-Pressure; (Travel Alarm) | 4 |
297-8584 Lines Gp-Bucket Cylinder
| 08***56 | 90 Degrees Elbow | 1 |
| 12***21 | Block | 1 |
| 13***40 | Sleeve-Hose; (110-cm Each) | 0 |
261-0270 Lines Gp-Front
| 09***92 | Clamp, Hose | 2 |
| 10***58 | Tee | 1 |
| 14***11 | Adapter Group | 1 |
274-8233 Lines Gp-Pilot
| 10***79 | Guard; (13-cm) | 0 |
| 15***73 | Plate | 1 |
| 20***24 | Connector As | 6 |
266-2678 Lines Gp-Pilot -Swing Motor
| 19***66 | Clamp | 1 |
| 20***56 | Connector As | 2 |
| 25***45 | Tube As | 1 |
274-8218 Lines Gp-Pilot -2-Way
| 20***35 | Connector As | 1 |
| 20***36 | Connector As | 1 |
| 20***41 | Elbow Group | 2 |
263-7002 Lines Gp-Pilot -Work Tool
| 09***37 | Valve As-Check | 1 |
| 09***01 | Seal-O-Ring (Id=39.40mm) | 1 |
| 19***48 | Tube As | 1 |
260-5273 Lines Gp-Pump
| 09***19 | Seal-O-Ring (Id=15.80mm) | 2 |
| 09***78 | Seal-O-Ring (Id=9.80mm) | 1 |
| 09***79 | Seal-O-Ring (Id=10.80mm) | 2 |
260-8892 Lines Gp-Return -With Check Valve
| 09***57 | Bolt-Socket Head; (M10x1.5x65-mm) | 4 |
| 09***79 | Seal-O-Ring (Id=10.80mm) | 2 |
| 09***17 | Seal-O-Ring (Id=114.40mm) | 1 |
260-5272 Lines Gp-Return
| 17***73 | Drive Group-Swing | 1 |
| 26***72 | Lines Group-Return | 1 |
| 27***32 | Motor Group-Swing | 1 |
259-7924 Lines Gp-Stick
| 10***47 | Coupling Group-Pump; -Piston | 1 |
| 25***24 | Lines Group-Stick | 1 |
| 29***75 | Pump Group-Piston; -Main Hydraulic | 1 |
266-2636 Lines Gp-Swing Motor
| 08***84 | Plug | 1 |
| 09***74 | Seal-O-Ring (Id=6.8mm); (Id=6.80mm) | 1 |
| 09***79 | Seal-O-Ring (Id=10.80mm) | 1 |
207-8329 Lines Gp-Travel Motor
| 09***39 | Spring | 1 |
| 09***80 | Seal-O-Ring (Id=59.69mm) | 1 |
| 09***75 | Screen As; (Hydraulic) | 1 |
191-1390 Manifold Gp-Control
| 10***59 | Case | 1 |
| 10***61 | Seal-Lip Type | 1 |
| 11***39 | Ball Bearing | 1 |
269-4283 Motor Gp-Swing
| 10***62 | Swashplate | 1 |
| 10***63 | Cover | 1 |
| 10***64 | Collar | 1 |
274-9032 Motor Gp-Swing
| 09***22 | Seal-O-Ring (Id=69.60mm) | 1 |
| 09***08 | Seal-O-Ring | 1 |
| 09***12 | Seal-O-Ring (Id=89.40mm) | 1 |
323-5684 Pump & Mtg Gp-Main Hydraulic
| 09***70 | Valve As; (Bypass) | 1 |
| 09***23 | Seal-O-Ring (Id=144.40mm) | 1 |
| 09***25 | Seal-O-Ring (Id=154.30mm) | 1 |
297-6575 Pump Gp-Piston -Main Hydraulic
| 17***87 | Spacer; (17x35x56.5-mm Thk) | 4 |
| 26***56 | Tank & Filter Group-Hydraulic | 1 |
| 29***75 | Pump Group-Piston; -Main Hydraulic | 1 |
165-9331 Screen Gp-Hydraulic
| 16***31 | Screen Group-Hydraulic | 1 |
| 29***77 | Valve Group-Main Control; (Main Control Valve) | 1 |
| 7X***18 | Washer-Hard; (13.5x40x5-mm Thk) | 8 |
274-5941 Shaft Gp-Drive
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 15***39 | Seal | 2 |
274-5942 Swashplate Gp
| 09***23 | Spring | 1 |
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
268-3054 Swivel Gp
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 14***45 | Plug Assem. | 1 |
| 15***39 | Seal | 2 |
260-5256 Tank & Filter Gp-Hydraulic
| 09***23 | Spring | 1 |
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
259-7955 Tank & Mtg Gp-Hydraulic
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 15***39 | Seal | 2 |
297-8589 Valve & Mtg Gp-Main Control
| 10***30 | Sheet | 1 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 15***39 | Seal | 2 |
200-4858 Valve Gp-Control -Bucket
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 15***39 | Seal | 2 |
275-2878 Valve Gp-Control -Stick
| 09***60 | Setscrew-Socket; (M6x1x6-mm) | 1 |
| 09***78 | Seal-O-Ring (Id=9.80mm) | 2 |
| 09***35 | Sleeve | 2 |
200-4864 Valve Gp-Control -Work Tool
| 20***64 | Valve Group-Control; -Work Tool | 1 |
200-4867 Valve Gp-Control -Blade
| 17***98 | Valve Group-Relief; (Main) | 1 |
| 18***55 | Valve As-Manual; (Shutoff)(Work Tool) | 6 |
| 20***56 | Nut | 8 |
275-2879 Valve Gp-Control -Inlet, Outlet
| 09***76 | Seal | 4 |
| 09***86 | Seal - O-Ring (19.80 mm Id) | 4 |
| 09***28 | Sleeve | 4 |
200-4862 Valve Gp-Control -Travel
| 09***74 | Seal-O-Ring (Id=6.8mm); (Id=6.80mm) | 2 |
| 09***79 | Seal-O-Ring (Id=10.80mm) | 4 |
| 16***16 | Plug | 1 |
275-2877 Valve Gp-Control -Boom
| 08***07 | Spring | 4 |
| 08***10 | Setscrew; (M10x21-mm) | 4 |
| 08***08 | Pedal | 2 |
200-4861 Valve Gp-Control -Inlet
| 10***30 | Sheet | 2 |
| 13***05 | Bolt; (M6x1x18-mm) | 4 |
| 15***39 | Seal | 2 |
200-4865 Valve Gp-Control -Boom, Work Tool Combiner Valve
| 20***65 | Valve Group-Control; -Boom, Work Tool Combiner Valve | 1 |
200-4860 Valve Gp-Control -Travel
| 09***34 | Adapter | 2 |
| 10***30 | Sheet | 2 |
| 11***22 | Bolt; (L=32mm) | 4 |
274-9034 Valve Gp-Control -Swing Brake
| 09***12 | Seal-O-Ring (Id=7.80mm) | 2 |
| 09***44 | Pin-Spring | 2 |
| 10***18 | Plug | 1 |
200-4868 Valve Gp-Control -Boom Swing
| 09***76 | Seal-O-Ring | 1 |
| 09***85 | Seal- -O-Ring (17.80 mm Id) | 1 |
| 09***79 | Ring-Backup | 1 |
200-4866 Valve Gp-Control -Swing
| 20***66 | Valve Group-Control; -Swing | 1 |
298-2877 Valve Gp-Main Control
| 09***82 | Seal-O-Ring (Id=13.80mm) | 1 |
| 09***85 | Seal- -O-Ring (17.80 mm Id) | 1 |
| 09***90 | Seal-O-Ring (Id=21.80mm) | 1 |
204-8278 Valve Gp-Manual
| 20***78 | Valve Group-Manual; -Work Tool, Harness; Wire | 1 |
| 25***22 | Boom Group | 1 |
| 25***26 | Cylinder Group-Boom | 1 |
341-3549 Valve Gp-Pilot -Travel
| 09***30 | Seal-Lip Type | 4 |
| 14***04 | Bushing | 4 |
| 15***89 | Shim; (1-mm Thk)(1.0mm) | 3 |
162-4578 Valve Gp-Pilot
| 09***33 | Seal Stk Link, Bkt Link & Cyl | 2 |
| 13***17 | Shim (0.5mm Thick) | 2 |
| 16***78 | Valve Group-Pilot; -Work Tool-Swing | 1 |
191-1392 Valve Gp-Pilot
| 09***30 | Seal-Lip Type | 6 |
| 14***71 | Bushing | 4 |
| 17***64 | Shim; (0.5-mm Thk) | 4 |
193-6360 Valve Gp-Pilot -Joystick
| 19***59 | Cylinder Group-Stick | 1 |
| 19***60 | Valve Group-Pilot; -Joystick | 1 |
| 25***24 | Lines Group-Stick | 1 |
165-9522 Valve Gp-Pilot -Travel
| 16***22 | Valve Group-Pilot; -Travel | 1 |
| 21***32 | Cylinder Group-Bucket | 1 |
| 29***84 | Lines Group-Bucket Cylinder | 1 |
274-9033 Valve Gp-Relief -Swing
| 20***77 | Guide; Hose, Cylinder Group-Blade, Guide | 1 |
| 24***83 | Control Group-Blade | 1 |
| 26***01 | Lines Group-Blade | 1 |
Implements
259-7925 Boom Ar
| 14***34 | Seal-Dust | 4 |
| 14***69 | Bushing | 2 |
| 21***81 | Pin As | 2 |
259-7922 Boom Gp
| 25***22 | Boom Group | 1 |
| 2C***59 | Plate-Identification; (Cat) | 2 |
| 32***08 | Plate | 6 |
259-7959 Linkage Ar-Bucket
| 09***10 | Tooth | 5 |
| 09***11 | Pin-Lock | 5 |
| 09***12 | Rubber | 5 |
316-4193 Linkage Gp-Bucket
| 19***85 | Coupler Group-Quick | 1 |
| 19***89 | Shim; (1-mm Thk) | 4 |
| 19***90 | Shim; (0.5-mm Thk) | 4 |
259-7923 Stick Ar-Hoe
| 18***60 | Shim; (0.3-mm Thk) | 4 |
| 19***86 | Coupler | 1 |
| 19***87 | Follower | 1 |
316-4194 Stick Gp-Hoe
| 09***96 | Stopper, Rubber | 1 |
| 12***80 | Screw-Flat Head; (M8x1.25x20-mm) | 2 |
| 15***09 | Protector | 3 |
Lubrication System
190-5739 Breather Gp
| 09***51 | Clamp | 1 |
| 19***39 | Breather Group; -Crankcase | 1 |
| 19***80 | Hose; (Crankcase Breather) | 1 |
266-2631 Filter & Mtg Gp-Engine Oil
| 15***24 | Valve Group-Fluid Sampling; (3/8-18 Nptf Thd) | 1 |
| 18***56 | Base As | 1 |
| 1R***14 | Filter As-Engine Oil | 1 |
190-5735 Lines Gp-Engine Oil
| 08***57 | Clamp | 2 |
| 09***54 | Bolt (16mm Long); (16-mm Long) | 2 |
| 09***75 | Bolt | 3 |
212-8639 Pump Gp-Engine Oil
Machine Arrangement
333-5710 Chassis Ar
| 16***01 | Handrail Group | 1 |
| 25***41 | Cover Group-Access; -Air Filter, Battery | 1 |
| 25***31 | Counterweight Group | 1 |
333-5700 Common Ar
| 25***46 | Installation Ar-Engine | 1 |
| 25***50 | Undercarriage Ar | 1 |
| 25***52 | Hydraulic Ar | 1 |
Operator Station
299-7809 Accessory Gp-Cab
| 20***86 | Nut; (M8x1.25-Thd) | 1 |
| 20***87 | Bolt As; (M8x1.25x20-mm) | 2 |
| 20***88 | Bolt As; (M8x1.25x16-mm) | 1 |
267-8127 Air Conditioner & Mounting Gp
| 15***81 | Screw; (M6x1x16-mm) | 5 |
| 15***81 | Armrest As | 1 |
| 19***22 | Support | 1 |
191-9470 Air Conditioner Gp
| 15***81 | Screw; (M6x1x16-mm) | 7 |
| 15***81 | Armrest As | 1 |
| 19***70 | Air Conditioner Group | 1 |
259-7940 Cab & Mounting Gp
| 11***02 | Knob | 1 |
| 19***92 | Valve Group-Pilot; -Blade Control | 1 |
| 20***27 | Support | 1 |
299-7810 Cab Gp
| 09***17 | Screw-Machine; (M5x0.8x6-mm) | 2 |
| 16***50 | Boot | 1 |
| 29***10 | Cab Group | 1 |
260-5265 Compressor Gp-Refrigerant
| 09***17 | Screw-Machine; (M5x0.8x6-mm) | 2 |
| 16***50 | Boot | 1 |
| 26***65 | Compressor Group-Refrigerant | 1 |
266-2633 Condenser & Mtg Gp-Refrigerant
| 15***46 | Switch | 1 |
| 15***47 | Switch-Toggle | 1 |
| 15***49 | Knob | 1 |
253-3630 Console Gp-Operator -Lh
| 08***56 | 90 Degrees Elbow | 1 |
| 09***79 | Tape-Color; (White) | 4 |
| 09***80 | Tape - Color; (Blue) | 2 |
222-1677 Console Gp-Operator -Armrest
| 19***59 | Control Group-Handle; -Lh | 1 |
| 19***60 | Valve Group-Pilot; -Joystick | 1 |
| 22***77 | Console Group-Operator; -Armrest | 1 |
253-3628 Console Gp-Operator -Rh
| 19***58 | Control Group-Handle; -Rh | 1 |
| 19***60 | Valve Group-Pilot; -Joystick | 1 |
| 25***28 | Console Group-Operator; -Rh | 1 |
244-9583 Control Gp-Blade
| 16***22 | Valve Group-Pilot; -Travel | 1 |
| 20***02 | Lever Group-Control; -Travel | 1 |
| 24***83 | Control Group-Blade | 1 |
193-6359 Control Gp-Handle -Lh
| 09***22 | Screw-Machine; (M4x0.7x8-mm) | 2 |
| 16***39 | Handle As | 1 |
| 16***15 | Joint | 1 |
193-6358 Control Gp-Handle -Rh
| 17***93 | Bumper; (Rubber) | 1 |
| 19***86 | Washer; (23x32x1.6-mm Thk) | 1 |
| 19***58 | Control Group-Handle; -Rh | 1 |
197-8190 Control Gp-Heat & Air Cond
| 15***30 | Clip | 4 |
| 15***63 | Case | 2 |
| 15***65 | Lever | 1 |
191-1387 Control Gp-Joystick -Lh
| 09***23 | Screw; (M3x0.5x10-mm) | 4 |
| 19***87 | Control Group-Joystick; -Lh | 1 |
| 21***89 | Cover | 1 |
191-1388 Control Gp-Joystick -Rh
| 19***88 | Control Group-Joystick; -Rh | 1 |
| 27***58 | Bracket As; (Lh) | 1 |
| 27***59 | Bracket As; (Rh) | 1 |
266-2677 Control Gp-Pilot Operated Hyd -Joystick, Pedals
| 13***72 | Bolt As; (M12x1.75x20-mm) | 2 |
| 17***66 | Handrail As | 1 |
| 26***77 | Control Group-Pilot Operated Hydraulic; -Joystick, Pedals | 1 |
266-2679 Control Gp-Pilot Operated Hyd
| 26***65 | Compressor Group-Refrigerant | 1 |
| 26***33 | Condenser & Mtg Group-Refrigerant | 1 |
| 26***54 | Lines Group-Air Conditioner | 1 |
267-8136 Cover Gp-Access
| 09***20 | Switch As-Rotary | 1 |
| 10***76 | Knob | 1 |
| 13***85 | Film-Instruction; (Blower Fan Speed) | 1 |
274-3519 Door Gp-Cab
| 27***19 | Door Group-Cab | 1 |
| 27***81 | Clip | 1 |
| 27***82 | Clip | 1 |
200-0910 Duct Gp-Cab Air
| 08***45 | Lock | 1 |
| 08***46 | Lock | 1 |
| 08***47 | Retainer | 1 |
248-3862 Gauge Gp-Cluster
| 24***62 | Gauge Group-Cluster | 1 |
| 27***30 | Liner | 1 |
| 28***69 | Liner | 1 |
274-3522 Handle Gp-Door
| 12***42 | Receiver-Refrigerant Dryer | 1 |
| 13***82 | Bracket As | 1 |
| 19***34 | Hose As | 1 |
168-1601 Handrail Gp
| 16***01 | Handrail Group | 1 |
| 5D***26 | Clamp-Band; (9/16 To 1 1/16) | 4 |
| 5P***67 | Hose (.625 In. I.D.)17.02 Dm(67 In.) | 0 |
260-5264 Heater & Air Conditioner Ar
| 09***45 | Cable; (Lanyard) | 1 |
| 26***64 | Heater & Air Conditioner Ar | 1 |
| 5P***58 | Sleeve; (Cable Splice) | 2 |
201-4571 Heater & Mtg Gp-Cab
| 12***11 | Mirror | 1 |
| 17***70 | Support As | 1 |
| 20***71 | Heater & Mtg Group-Cab | 1 |
274-3556 Latch Gp-Cab Door
| 27***56 | Latch Group-Cab Door | 1 |
| 27***88 | Bracket | 1 |
| 27***90 | Antenna As | 1 |
085-6444 Latch Gp-Front Window
| 08***44 | Latch Group-Front Window | 1 |
| 20***71 | Heater & Mtg Group-Cab | 1 |
| 22***77 | Console Group-Operator; -Armrest | 1 |
278-9929 Liner Gp-Cab
| 20***06 | Pedal As; (Rh) | 1 |
| 20***07 | Pedal As; (Lh) | 1 |
| 27***29 | Liner Group-Cab | 1 |
266-2654 Lines Gp-Air Conditioner
| 09***43 | Pin-Cotter | 1 |
| 12***56 | Tread-Nonskid | 1 |
| 12***58 | Pedal-Rubber | 1 |
271-5877 Lines Gp-Heater
| 09***16 | Grommet | 1 |
| 11***56 | Step Assem. | 2 |
| 12***10 | Step-Rubber | 2 |
7y-0059 Literature Gp
| 09***36 | Screw; (Machine) (M5x0.8x10mm) | 4 |
| 27***67 | Radio Group | 1 |
| 7Y***59 | Literature Group | 1 |
267-8115 Mirror Gp-Rear View
| 20***84 | Bolt; (M8x1.25x75-mm) | 4 |
| 20***85 | Lockwasher | 4 |
| 26***68 | Seat Group; -Cloth, Suspension | 1 |
274-3521 Mounting Gp-Radio
| 20***87 | Bolt As; (M8x1.25x20-mm) | 4 |
| 20***33 | Bolt; (7/16-20x1.1-In)(7/16-20x11.0in) | 2 |
| 20***34 | Washer | 2 |
259-7939 Operator Ar
| 21***51 | Support Group-Seat | 1 |
| 22***92 | Lock As | 1 |
| 22***21 | Cam | 1 |
274-8248 Pedal Gp-Foot
| 21***50 | Support Group-Seat | 1 |
| 27***48 | Pedal Group-Foot | 1 |
| 8T***21 | Washer-Hard; (11x21x2.5-mm Thk)(M10x1.50x30mm) | 4 |
208-2177 Pedal Gp-Foot -Direction, Speed
| 19***60 | Pin | 1 |
| 19***61 | Plate | 1 |
| 20***42 | Rail As; (Lh) | 1 |
259-7944 Platform Gp-Operator
| 14***95 | Hose; (650-cm Each) | 0 |
| 19***24 | Tank Group-Window Washer | 1 |
| 25***44 | Platform Group-Operator | 1 |
267-8122 Radio Gp
| 09***44 | Screw-Machine; (M8x1.25x12-mm) | 2 |
| 17***72 | Spacer | 6 |
| 17***74 | Spacer | 4 |
259-7958 Seat Gp -Cloth, Suspension
| 15***57 | Stop-Rubber | 2 |
| 16***98 | Seal | 1 |
| 17***20 | Clip | 7 |
260-5268 Seat Gp -Cloth, Suspension
| 08***44 | Latch Group-Front Window | 1 |
| 26***68 | Seat Group; -Cloth, Suspension | 1 |
259-7927 Support Gp-Seat -With Mounting
| 12***07 | Film-Instruction; (On Radiator Filler Cap) | 1 |
| 12***97 | Film-Instruction; (2-Speed) | 1 |
| 12***00 | Film-Instruction; (Lever Lock) | 1 |
218-4251 Support Gp-Seat
| 21***51 | Support Group-Seat | 1 |
| 25***54 | Film-Notice; (Hammer, Read Omm) | 1 |
| 26***61 | Film-Information; (Operator Controls) | 1 |
218-4250 Support Gp-Seat
| 21***50 | Support Group-Seat | 1 |
| 25***62 | Film-Instruction; (Control Pattern) | 1 |
| 27***46 | Film-Information; (Operator Controls) | 1 |
267-1049 Washer Gp-Window
| 26***49 | Washer Group-Window | 1 |
274-3517 Window Gp-Cab
| 27***17 | Window Group-Cab | 1 |
274-3520 Window Gp-Front
| 27***20 | Window Group-Front | 1 |
274-3557 Window Gp-Sliding
| 27***57 | Window Group-Sliding | 1 |
Power Train
191-1384 Drive Gp-Travel Motor & Final
| 15***83 | Fastener Group-Swing & Final Dr | 1 |
| 15***52 | Sprocket Group | 1 |
| 19***84 | Drive Group-Travel Motor & Final | 3 |
259-7956 Power Train Ar
| 08***68 | Bolt; (M14x2x40-mm) | 18 |
| 15***95 | Sprocket | 2 |
| 25***56 | Power Train Ar | 1 |
158-4752 Sprocket Gp
| 13***73 | Bolt As; (M12x1.75x25-mm) | 11 |
| 15***52 | Sprocket Group | 1 |
| 31***41 | Box Group-Fuel Transfer | 1 |
Service Equipment And Supplies
260-5258 Film Gp -Control Pattern
| 26***58 | Film Group; -Control Pattern | 1 |
260-5285 Film Gp -Work Tool
| 26***85 | Film Group; -Work Tool | 1 |
333-5705 Plate & Film Gp
| 33***05 | Plate & Film Group | 1 |
Undercarriage
185-9232 Cylinder Gp-Idler -Lh
| 09***98 | Dowel | 1 |
| 12***65 | Adapter | 2 |
| 15***99 | Gear & Bearing Group-Swing | 1 |
185-9233 Cylinder Gp-Idler -Rh
| 17***86 | Plate | 1 |
| 17***87 | Bearing As | 1 |
| 18***33 | Cylinder Group-Idler; -Rh | 1 |
259-7951 Frame Gp-Undercarriage
| 16***65 | Spring Group-Recoil | 2 |
| 24***02 | Idler Group-Front; -Lh | 1 |
| 24***03 | Idler Group-Front; -Rh | 1 |
354-2453 Frame Gp-Undercarriage
| 09***92 | Pin-Spring | 2 |
| 09***90 | Ball Bearing | 2 |
| 12***60 | Seal-Oil | 2 |
155-6799 Gear & Bearing Gp-Swing
| 15***99 | Gear & Bearing Group-Swing | 1 |
| 15***67 | Link-Track; (Rh) | 37 |
| 15***68 | Link-Track; (Lh) | 37 |
155-6798 Gear & Bearing Gp-Swing
| 09***92 | Pin-Spring | 2 |
| 09***90 | Ball Bearing | 2 |
| 12***60 | Seal-Oil | 2 |
353-5578 Idler Gp-Front
| 12***36 | Nut; (M30x3-Thd) | 1 |
| 12***52 | Spring | 1 |
| 12***53 | Support | 1 |
354-2462 Idler Gp-Front
| 15***66 | Link As-Track | 1 |
| 15***75 | Bolt; (M12x1.25x38-mm) | 152 |
| 15***76 | Nut; (M12x1.25-Thd) | 152 |
240-6302 Idler Gp-Front -Lh
| 09***41 | Seal-O-Ring (Id=41.70mm) | 1 |
| 09***61 | Bearing-Carrier Roller | 2 |
| 09***62 | Retainer | 1 |
155-6790 Idler Gp-Front
| 09***79 | Setscrew-Socket; (M12x1.75x25-mm) | 2 |
| 15***90 | Idler Group-Front | 1 |
| 27***76 | Roller Group-Track Carrier | 2 |
240-6303 Idler Gp-Front -Rh
| 15***13 | Seal-O-Ring | 2 |
| 15***14 | Bushing | 2 |
| 23***62 | Ring-Retaining | 2 |
158-4766 Link As-Track
| 15***44 | Track Group | 1 |
| 15***66 | Link As-Track | 1 |
| 28***50 | Guard Group-Track Guide | 1 |
326-8521 Roller Ar-Track & Carrier
| 15***90 | Idler Group-Front | 1 |
| 15***98 | Gear & Bearing Group-Swing | 1 |
| 25***51 | Frame Group-Undercarriage | 1 |
277-8576 Roller Gp-Track Carrier
| 27***76 | Roller Group-Track Carrier | 1 |
| 4I***39 | Core | 1 |
| 4I***62 | Cap | 1 |
340-8957 Roller Gp-Track-Center Flange
| 08***54 | Accumulator Group-Hydraulic; -Charged-Pilot Oil | 1 |
| 34***57 | Roller Group-Track-Center Flange | 1 |
| 4I***67 | Cap | 1 |
163-7165 Spring Gp-Recoil
| 08***75 | Core | 1 |
| 08***76 | Cap | 1 |
| 08***77 | Seal | 1 |
284-1648 Track Gp
| 15***00 | Film-Warning; (High Pressure Cylinder) | 1 |
| 28***48 | Track Group | 1 |
155-6844 Track Gp
| 14***06 | Accumulator Group-Hydraulic; -Charged | 1 |
| 15***44 | Track Group | 1 |
| 4I***36 | Accumulator Group-Hydraulic; -Charged-Pilot Oil | 1 |
259-7950 Undercarriage Ar
| 10***89 | Cover | 1 |
| 10***90 | Setscrew | 1 |
| 12***52 | Seat-Spring | 1 |
Work Tools
333-5720 Blade Ar
| 12***47 | Louver | 4 |
| 12***20 | Duct As | 1 |
| 12***22 | Duct | 1 |
333-5725 Blade Gp-Straight
| 15***03 | Case | 1 |
| 15***04 | Case | 1 |
| 15***05 | Shroud | 1 |
320-4869 Bucket As-Hoe -High Capacity
| 21***97 | Plug | 4 |
| 27***89 | Screw; (M12x1.75x50-mm) | 2 |
| 29***10 | Cab Group | 1 |
320-4865 Bucket Gp-Hoe -High Capacity
| 27***17 | Window Group-Cab | 1 |
| 27***18 | Wiring Group-Cab | 1 |
| 27***19 | Door Group-Cab | 1 |
199-4085 Coupler Gp-Quick
| 19***29 | Condenser As | 1 |
| 19***85 | Coupler Group-Quick | 1 |
| 26***70 | Plate As | 1 |
199-4083 Coupler Gp-Quick
| 12***57 | Pulley Group-Idler | 1 |
| 12***80 | Bracket As | 1 |
| 12***21 | V-Belt; (Refrigerant Compressor) | 1 |
306 serial number reference
The PIN plate on a Cat 306-family mini excavator is a riveted metal tag mounted on the machine frame, typically on the front of the machine near/below the cab; a separate engine serial plate sits on the engine block. Since 2001 Caterpillar PINs run 17 characters: CAT + a 5-character machine descriptor + a single check character + the 3-character serial prefix + a 5-digit sequence number. The 3-character prefix in that string ties the machine to a specific production run and model generation, and together with the sequence number is what a dealer uses to pull an exact build date.
| Prefix | Identifies | Notes |
|---|---|---|
| SMD | Cat 306 Mini Hydraulic Excavator - first generation (pre-306E) | Pre-306E generation, built roughly mid-2000s into the early 2010s. Fitted with a Mitsubishi 4M40 diesel (2.84 L), rated 37.6 kW net. Operating weight sits in the high-5-tonne class (varies by configuration). Sold heavily into South America/Asia-Pacific dealer channels rather than North America. Confirm exact serial range with dealer. |
| MXH | Cat 306 Mini Hydraulic Excavator - first generation (pre-306E), later production block | Second known prefix block for the same pre-306E, Mitsubishi 4M40-powered 306. Same base machine as the SMD-prefix run; exact date split between the two prefixes is not documented. Confirm with dealer. |
| FHL | Cat 306E Mini Hydraulic Excavator | 306E generation, roughly 2013 into the mid-2010s (exact cutover varies by source). Runs a Cat C2.6 DI Turbo diesel rated 41.5 kW net, operating weight near 5795 kg. Cab or canopy per order. |
| E2W | Cat 306E2 Mini Hydraulic Excavator, including the 306E2 FB (fixed front dozer blade) configuration | 306E2 generation, roughly 2016 into 2019 (exact cutover varies by source). Runs a Cat C2.4 DI diesel rated 36.5 kW net, operating weight near 5800 kg. Covers both the plain 306E2 and the FB build. |
| 6G6 | Cat 306 / 306 CR Mini Hydraulic Excavator - current 6-tonne-class generation | Current-generation 306, marketed as 306 CR, introduced around 2019-2020 and still in production. Runs a Cat C2.4 turbo diesel rated 41.7 kW (55.9 hp) net, Tier 4 Final/Stage V. Do not confuse with prefix GW6, which is built on the same parts platform but tags the 306.5, a separate, wider-frame sales model - GW6 does not belong on a 306. |
Frequently asked questions
What engine does the Cat 306 excavator use?
The 306 CR and 306.5 run the Cat C2.4 Turbo, a 2.43-liter four-cylinder diesel rated 41.7 kW (55.9 hp) net at 2200 rpm and 43.2 kW (57.9 hp) gross. North American and European machines meet Tier 4 Final/Stage V emissions; the 306.5 variant sold in other regions is tuned to different local emissions rules on the same engine platform.
What is the operating weight of the Cat 306?
Operating weight runs about 6.4-7.2 t (14,100-15,800 lb), depending on configuration. Canopy machines run roughly 6,410-7,090 kg (14,134-15,633 lb); cab machines run roughly 6,470-7,175 kg (14,266-15,821 lb). Stick length, track choice, and counterweight all shift the number, so confirm the exact configuration rather than relying on the model name alone.
What replaced the Cat 306?
Nothing yet - the 306 CR remains Caterpillar's current 6-ton mini excavator. It was introduced in 2019 to fill a gap Cat's lineup previously jumped over directly: the step from the 5.5-ton 305 CR to the 7.5-ton-plus 307.5.
What 306 owners discuss
Has the engine in the Cat 306 mini excavator changed across generations?
Yes, and the two are not the same engine tune. The current Next Generation 306 CR runs a Cat C2.4T turbocharged diesel rated 41.7 kW (55.9 hp) net at 2200 rpm, gross 43.2 kW (57.9 hp), meeting EPA Tier 4 Final/EU Stage V, and it carries a diesel particulate filter (DPF) in the exhaust. The prior 305.5E2/306E2 CR generation used a naturally aspirated C2.4 rated around 36.5 kW (48.9 hp) at 2700 rpm, Tier 4 Interim/Stage IIIA, with no DPF. Confirm which generation you actually have before comparing power complaints or ordering parts — owners moving from the naturally aspirated E2 to the turbo Next Gen consistently note noticeably stronger pulling power for the same size class.
Why does the 306 CR keep calling for a regeneration, and is that a red flag?
Not by itself. The DPF traps soot and needs a periodic active regen to burn it off; on the Next Gen 306 CR the controller manages this automatically without operator input. What regen can't clear is ash, which needs removal at scheduled service intervals — skip that and exhaust backpressure climbs. Machines worked mostly at low load or idle build soot faster and regen more often, so a used unit with a history of frequent forced regens may simply have had a light-duty life. It is still worth having it scanned for exhaust-temperature or soot-sensor faults before assuming duty cycle explains everything.
My 306's travel jerks or lurches when starting off — what's the usual cause?
A worn pilot control valve is a documented culprit: one owner traced a left-travel lurch to internal wear in the travel pilot valve, which kept fluid from metering smoothly at low input and caused the track to "unlock" late and jerk. Replacing the valve eliminated it. Air trapped in the pilot circuit and worn main control valve spools are the other common suspects. Because unexpected travel or function lurch is a safety issue around people and structures on site, have your dealer verify the pilot valve and control valve condition before returning the machine to full service.
What does a travel pedal fault code on the 306 usually mean?
A right travel pedal code reading signal voltage above normal points at the pedal's position sensor circuit, not necessarily the pedal itself. Field troubleshooting typically starts at the sensor wiring and connector for corrosion or damage before condemning the sensor, and the machine can often still be driven in an alternate control mode while the fault is active. Because fault numbering and wiring schematics vary by serial number range, pull the machine's specific electrical schematic rather than assuming a generic pinout applies.
What undercarriage and drivetrain wear patterns show up most on this class of mini excavator?
Three repeat items. Track tensioner leak-down, where a failed grease seal inside the tensioning cylinder lets the track slack off again soon after regreasing, requiring the whole adjuster to be pulled and resealed. Final drive or travel motor seepage at the sprocket, usually a failed floating face (duo-cone) seal that debris packed around a dirty undercarriage can push out of position. And swing gear backlash, felt as the upper structure hanging up or going slack through part of its rotation, which can point to a chipped or worn tooth. Rock the boom against the swing lock and feel for play as part of any inspection. Because swing and travel are motion functions around people on a jobsite, have your dealer verify any suspected final drive, tensioner, or swing gear wear before the machine goes back to work.
What causes intermittent stalling or no-power complaints on the 306?
Two separate failure families get reported and are easy to mix up. Stalling or power loss during operation, especially on lower-hour machines, traces most often to fuel: a clogging filter, water or debris in the tank, or air drawn in at a loose fitting. No power to the key switch on start-up traces more often to the electrical side — corroded battery terminals, a blown fuse, or a corroded harness connector at the switch — rather than the switch itself. Pull stored and active fault codes with a scan tool before chasing either path blind. Hard cold starting across this class of Cat mini excavator is usually glow plug condition or battery state of charge first, then fuel filter and injector condition; replace glow plugs as a full set rather than one at a time, since uneven preheat causes rough, smoky starts.
What should I check before buying a used Cat 306?
Confirm which engine generation you're looking at — naturally aspirated C2.4 E2-series versus turbocharged C2.4T Next Gen CR — since power output and DPF servicing needs differ. Ask for service records; a machine without them is a harder sell even at low hours. Cold-start it yourself and watch for smoke, listen for knock, and check for water in the oil or oil in the coolant. Walk the undercarriage for track wear, tensioner leak-down, and final drive seepage at the sprockets. Rock the boom against the swing lock to feel for gear backlash. Check hydraulic cylinders, hoses, and the pilot valve area for weeping or fresh wiped-clean spots hiding a leak. On turbo Next Gen machines, ask about regen frequency and whether any exhaust or soot-sensor faults have logged. Pull the fault code history with a scan tool if the seller allows it — stored codes tell you more than a clean-looking machine ever will.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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