Caterpillar 436
Caterpillarbackhoe loader(no series)

Caterpillar 436

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 436 is a 2WD (optional 4WD/MFWD) wheeled backhoe loader in Cat's mid-size 400-series backhoe loader class, sitting between the smaller 416/426 machines and the larger 446-series units. The base 436 (5KF serial prefix, serials 00001-00805) and the 436 Series II running change (5KF 00806-up) both use the naturally aspirated, Perkins-built Cat 4.236 diesel: a 3.86 L (236 cu in) 4-cylinder direct-injection engine rated 61.9 kW (83 hp) gross and 57.4 kW (77 hp) net. Operating weight runs about 6,878 kg (15,163 lb). Production covers roughly the late 1980s into the early 1990s, with the Series I/Series II split falling around 1990-1991 depending on the source. The machine runs a 4-speed power-shuttle transmission with full synchromesh gearing, enclosed multi-disc service brakes that run in axle housing oil, and a shared loader/backhoe hydraulic circuit that uses ball-type resolver valves to prioritize flow when more than one function is worked at once. Cat offered it with a standard or extendable backhoe dipper stick and 2WD or 4WD front axle configurations.

The Series II update refined the base 436 within the same 5KF production block before Cat moved the platform forward to the 436B and later the 436C, generations that added a turbocharged engine and updated hydraulics and left behind the fully mechanical, ECM-free architecture of the base machine. That mechanical simplicity, no electronic fault codes and no sensor network beyond basic oil-pressure and coolant-temperature switches, is exactly why the base 436 and Series II still hold a place in the used and parts market: buyers who want a machine serviceable with hand tools and a multimeter gravitate to this generation over later electronic backhoes. Because these units are now 30-plus years old, demand centers on wear items rather than complete machines: loader and backhoe pin-and-bushing sets, resolver valve seals, injection pump and injector rebuilds, and power-shuttle clutch pack components, with sourcing increasingly running through cross-reference and aftermarket channels as Cat's own mainstream parts support for the platform ages out.

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 436 specifications

Engine

Engine modelFour-cylinder, naturally aspirated diesel (4.236 family), used through the 436 and 436 Series II production run
Gross power61.9 kW (83 hp)
Net power57.4 kW (77 hp)
Displacement3.86 L (236 cu in)
Cylinders4, in-line, direct injection
Emissions tierNot documented — machine predates formal off-highway emissions tiers

Weights

Operating weight (2WD, standard configuration)6,878 kg (15,163 lb)
Shipping weightNot published — verify with dealer for a specific unit
Ground pressureNot published for this model

Dimensions

Transport length7.10 m (23.3 ft)
Transport width2.29 m (7.5 ft)
Transport height (travel position)3.81 m (12.5 ft); cab-top height alone is 2.80 m (9.2 ft)
Wheelbase2.10 m (6.9 ft)
Ground clearance0.37 m (1.2 ft)
Turning radius3.93 m (12.9 ft)

Performance

Forward travel speed29.8 km/h (18.5 mph)
Reverse travel speed29.9 km/h (18.6 mph)
Backhoe dig depth5.46 m (17.9 ft) standard stick; 6.52 m (21.4 ft) with extendable stick
Backhoe reach from swing pivot6.07 m (19.9 ft) standard stick; 7.13 m (23.4 ft) with extendable stick
Backhoe load/dump height3.81 m (12.5 ft) standard stick; 4.36 m (14.3 ft) with extendable stick
Loader breakout force35.1 kN (7,891 lb)
Backhoe bucket digging force48.9 kN (11,003 lb)

Service capacities (summary)

Fuel tank128.3 L (33.9 gal US)
Hydraulic systemPump flow 138.2 L/min (36.5 gpm) at 186 bar (2,700 psi) relief pressure; reservoir capacity not separately published for this configuration
Engine oil (with filter)7.2 L (7.6 qt)
Cooling system11.4 L (12.0 qt)

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

436 fluids & capacities

SystemCapacityRecommended fluid
Engine crankcase (with filter)7.0-8.0 L (7.4-8.5 US qt) - varies by configuration/seriesCat Diesel Engine Oil (Cat DEO). Select SAE 10W, 30W or 40W straight grade or a 15W-40 multigrade by ambient temperature range per the OMM viscosity chart; multigrade preferred for cold starts below 0C (32F).
Cooling system21.0 L (22.2 US qt)Cat permanent-type antifreeze/coolant (ethylene-glycol base, Cat ELC or equivalent full-strength Cat coolant), mixed per the OMM climate chart. Standard mix runs 50% concentration; raise toward 60% only for extreme cold, never exceed it.
Fuel tank128 L (33.8 US gal)No. 2-D diesel fuel for normal service. Switch to No. 1-D or a winter blend in cold climates per the OMM fuel-handling section.
Transmission (4-speed powershuttle gearbox)10.0 L (10.6 US qt)Cat Transmission/Drive Train Oil (TDTO), single-grade SAE 10W across most of the OMM ambient range; heavier grade only called out for sustained high-heat operation.
Rear axle, differential and final drivesnot documented for this exact configuration in available sources - verify with dealerCat TDTO, same grade as the transmission. Final drive planetary reduction sits in each wheel hub and draws from the axle housing fill; differential lock is standard on the heavy-duty industrial rear axle.
Hydraulic system (tank and lines)79.0 L (20.8-21.0 US gal)Cat TDTO serves double duty as the hydraulic fluid on this Series II loader/backhoe and hydrostatic-steering circuit. Grade follows the same ambient-temperature chart as the transmission fill.
Grease - all pins, bushings and pivot pointsspec only, no reservoir capacityCat Multipurpose Grease (Cat MPGM), NLGI 2 lithium-complex grease with moly (MoS2) additive for high-load pin and bushing points. Apply at the scheduled daily/periodic lube points listed in the maintenance chart.

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

Caterpillar 436 maintenance schedule

Service intervalTasks
Every 50 h
  • Check engine oil level before starting the 4.236 diesel
  • Check hydraulic reservoir level and coolant level at the radiator header tank
  • Drain water and sediment from the fuel tank sump and check the fuel/water separator
  • Grease loader arm, backhoe boom/dipper/bucket pivot pins and front axle kingpins/tie-rod ends, more often in abrasive digging conditions
  • Check tire pressure and inspect sidewalls for damage
  • Check service brake pedal travel and parking brake holding force separately
Every 250 h
  • Change engine oil and the 4.236 filter element
  • Check battery electrolyte level and clean terminals and ground straps
  • Inspect alternator and fan belt tension and check starter connections
  • Check transmission and axle housing oil level
  • Clean the radiator core and screen
  • Recheck parking brake adjustment
Every 500 h
  • Replace the fuel filter/water separator element and bleed the injection system
  • Replace the hydraulic system filter element
  • Change the transmission oil filter
  • Check front axle differential and final drive oil level
  • Inspect stabilizer cylinder rod ends and base fittings for oil weeping
  • Run loader and backhoe functions together to check resolver shuttle-valve response
Every 1,000 h
  • Change transmission oil and axle/differential oil
  • Sample engine oil, transmission oil and hydraulic oil for wear metals
  • Inspect injection pump timing and injector spray pattern for smoke or drift
  • Check front axle kingpin and tie-rod end play
  • Inspect enclosed multi-disc service brake adjustment in the axle housing
Every 2,000 h
  • Change hydraulic tank oil and clean the suction strainer
  • Check and adjust engine valve lash on the 4.236
  • Change engine coolant
  • Inspect resolver shuttle-valve balls and seats in the loader/backhoe hydraulic circuit
  • Inspect power-shuttle clutch packs for slippage if drive-loss symptoms have appeared
Every 4,000 h
  • Rebuild or replace the mechanical injection pump and injector set once calibration no longer clears smoke or timing drift
  • Overhaul backhoe swing bearing, kingpost bushings and boom/dipper/bucket pin-and-bushing sets
  • Inspect starter and alternator for bearing wear from duty-cycle heat and vibration, rebuild or replace as needed
  • Reseal the hydraulic pump and main control valve once seal-kit replacement no longer restores pressure and flow

Servicing the 436 beyond the schedule

Predictive maintenance & fluid analysis

The naturally aspirated 4.236 runs no ECM, so wear shows up in oil condition, not fault codes. Sample engine oil, the transmission fill and the hydraulic reservoir at scheduled intervals to catch injection pump drift, clutch pack wear or resolver valve leakage before failure. Watch for smoke that persists after warm-up, a sign of injector fouling or timing drift rather than normal naturally aspirated cold-start haze, and track loader/backhoe pin play by hand since nothing onboard will flag linkage looseness.

Corrective & common repairs

Intermittent loss of drive after the power-shuttle transmission warms up, or reverse that won't engage at all, usually points to the shifting module or forward/reverse clutch packs rather than fluid condition. A backhoe that speeds up when the loader is worked at the same time signals a stuck resolver shuttle ball in the shared hydraulic circuit, reseated or resealed from underneath without splitting the machine. Weeping stabilizer cylinder rod seals and worn front-axle kingpins and tie-rod ends round out the recurring repair list.

Overhaul & rebuild points

High-hour 4.236 engines typically need injection pump recalibration and a fresh injector set rather than internal block work, since this naturally aspirated block has a reputation for a long-lived core. Backhoe swing bearing, kingpost bushings and boom/dipper/bucket pins wear into slop once greasing lapses and are the classic rebuild items on this loader arm. Enclosed multi-disc service brakes run in axle oil and rarely need attention outside a major axle overhaul; resolver valve balls and seats are a low-cost rebuild against replacing the hydraulic block.

Seasonal & environment servicing

Cold climates call for winter-blend fuel and a fuel/water separator check before start, since there is no glow-plug electronics to mask condensation-related fuel contamination; brief white smoke on a cold start is normal for this naturally aspirated engine. In hot or abrasive digging conditions, shorten the loader, backhoe and front-axle kingpin grease interval below the standard schedule. Owners consistently cite grease discipline as the top factor separating long-lived 436 units from machines needing early pin-and-bushing replacement.

436 common service parts

Part numberPart
8T-6655Film-Identification (On Fuel Filter)Check fitment →
8T-6656Film-Identification (On Oil Filter)Check fitment →

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436 fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
No OEM electronic fault codes presentThe base Cat 436 (5KF prefix, Series II) uses a naturally aspirated, mechanically injected 4.236 diesel with no engine or machine ECM, so it never generates MID-CID-FMI codes or flash codes.Not applicable - machine architecture predates Caterpillar electronic engine and machine control systems entirely.Diagnose using analog gauge readings, dash telltale lamps, wiring schematics, and manual electrical/hydraulic checks instead of a code reader.
Charging system telltale lamp (battery symbol)Charging circuit voltage has dropped below normal, alternator not keeping batteries charged.Slipping or worn alternator belt, failed alternator or regulator, loose or corroded battery and ground connections.Check belt tension, test alternator output, clean and tighten battery and ground terminals.
Engine oil pressure telltale lamp (oil can symbol)Engine oil pressure has fallen below the safe minimum.Low oil level, worn oil pump, clogged filter, worn bearings, or a faulty oil pressure sender/switch.Shut engine down immediately, check oil level and look for leaks, verify sender/switch before further operation.
Coolant temperature gauge reading in the high/red zoneEngine coolant temperature has exceeded normal operating range.Low coolant level, clogged radiator fins, failed thermostat, slipping fan belt, or water pump failure.Let the engine cool, check coolant level and radiator condition, inspect belt and thermostat.
Air cleaner restriction indicator (where fitted)Air filter element restriction has reached the service limit.Dirty or clogged primary air filter element.Inspect the element and clean or replace per the maintenance interval chart.
Neutral-start no-crank conditionStarter circuit is blocked because the transmission is not confirmed in neutral.Transmission control levers left out of neutral, or a faulty neutral-start switch.Confirm transmission levers are in neutral with the forward-reverse neutral lock engaged, then test the neutral-start switch if the engine still will not crank.
Slow-crank or no-crank at starter (field complaint, not a coded fault)Starter fails to turn the engine over or cranks weakly despite the start switch working.Corroded or loose ground cable at the frame, weak battery, failed starter relay/solenoid, or a blown fuel-solenoid fuse.Clean and tighten all ground and battery terminals, load-test the battery, listen for solenoid click, and check the fuel-solenoid fuse.

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

436 attachments & work tools

Loader (front) buckets

General-purpose front bucket for this machine runs roughly 2.26-2.3 m (89 in) wide with capacity in the 0.75-1.0 m3 (1.0-1.3 yd3) range, varying by configuration and source. Breakout force is rated near 35 kN (about 7,890 lbf). A hydraulically operated multi-purpose (4-in-1) bucket is offered as an alternative to the standard general-purpose front bucket on this backhoe loader class.

Backhoe (rear) digging buckets

Standard-duty digging buckets for this size class typically run about 300-900 mm (12-36 in) wide, covering trenching, general excavation, and ditch cleanup. Standard dipperstick gives a dig depth near 4.9-5.5 m (16-18 ft); an optional extendable (telescoping) dipperstick adds reach and depth beyond the standard-stick figures.

Backhoe swing/mounting arrangement

This generation uses a swing-frame, sideshift-type backhoe mounting rather than the center-pivot arrangement used on the later 436C, per the shared vehicle-systems documentation covering the 416/426/436 and 428/438 family. Bucket attaches to the dipper through a pinned linkage typical of this class.

Rear coupler / pin grabber

A manual dual-lock pin-grabber coupler is offered for the backhoe stick, sized for the shared backhoe loader class this model belongs to, for faster bucket changes without pulling pins. The coupler fits between dipper and bucket and keeps the standard pin spacing used across that class.

Hydraulic hammer / breaker

A flat-top, stick-mounted hydraulic hammer sized for this backhoe loader class is offered for light-to-medium demolition, pavement breaking, and frozen-ground work. Fitting a hammer requires a matching factory hydraulic kit (auxiliary plumbing and relief-valve setting) on the backhoe stick; common tool options are moil, chisel, and blunt points.

Material handling and misc work tools

Pallet forks, augers, thumbs, pickup brooms, and cold planers are offered across the Cat backhoe loader lineup and apply to this size class: forks for palletized loads, augers for post-hole and footing work, thumbs for handling irregular debris and material, brooms for surface cleanup, and cold planers for small-scale asphalt milling. Most mount to the same backhoe stick/bucket pin arrangement as the standard digging bucket.

Engine and hydraulics affecting attachment sizing

This model runs a naturally aspirated 3.9 L (about 235.6 cu in) four-cylinder diesel rated near 57-58 kW (77 hp net), with hydraulic pump flow around 138 L/min (36.5 gpm) and relief-valve pressure near 186 bar (2,700 psi); these figures govern sizing for auxiliary-flow tools like hammers and augers. Later 436B/436C models use a larger 4.4 L turbocharged engine and should not be used as a reference for this model's hydraulic-kit sizing.

Factory guarding and cab configuration

Factory options for this class include ROPS/FOPS operator protection in open-canopy or enclosed-cab form, plus a rear window/screen guard recommended when running a hammer or other impact tool. Both 2WD and 4WD driveline configurations are offered across this size class.

All 436 assemblies by section

Every catalogued assembly group for the Caterpillar 436. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Backhoe
9r6148 Boom Gp-Backhoe
9r5630 Bucket Gp-Hoe
9r5618 Bucket Gp-Hoe
9r6624 Bucket Gp-Rock
9r5624 Bucket Gp-Hoe
9r6618 Bucket Gp-Rock
9r6151 Frame Gp-Swing
9r0040 Linkage Gp-Bucket-Backhoe
9r2961 Mounting Gp-Bucket
9r6007 Pad Gp-Stabilizer
9r1085 Pad Gp-Street
9r4604 Stabilizer Gp-Backhoe
9r5123 Stick Gp-Extension
9r1598 Stick Gp-Extension
9R***98Stick Group-Extension; Stick Gp-Extendable1
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9r6119 Stick Gp-Extension
9R***19Stick Group-Extension; Stick Gp-Extendable1
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9r6189 Stick Gp-Extension
9r5122 Stick Gp-Extension
9R***98Stick Group-Extension; Stick Gp-Extendable1
9R***22Stick Group-Extension1
9R***23Stick Group-Extension1
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9r5526 Stick Gp-Hoe
9w1251 Tip Gp-Abrasive
7t4672 Tip Gp-Penetration
9j3172 Tip Gp-Short
9r5866 Tooth Gp-Uni Bolt-On
Basic Engine
7c3734 Camshaft Gp
7w6206 Cover Gp-Valve Mechanism
7c8213 Crankshaft Gp
7c3732 Crankshaft Gp
7c6070 Cylinder Block As
7c6071 Cylinder Block Gp
7c3188 Cylinder Head Gp
7c3735 Cylinder Head Gp
7C***35Cylinder Head Group; Head Gp-Cylinder1
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7c7901 Engine Ar-Primary
1W***78Gear Group-Front; Gear Gp-Front Idler1
1W***57Pump Group-Engine Oil1
2W***70Lines Group-Engine Oil1
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7w6212 Flywheel Gp
9y5003 Gear Gp-Front Idler
9Y***03Gear Group-Front; Gear Gp-Front Idler1
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1w7878 Gear Gp-Front
1W***78Gear Group-Front; Gear Gp-Front Idler1
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7c3827 Housing Gp-Front Engine
7C***27Housing Group-Front; Housing Gp-Front Engine1
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7w6277 Lifting Gp-Engine
06***43Plate-Front1
0T***03Bolt Bracket To Starting Engine Fuel Tank2
5B***08Bolt-To Front Lifting Plate Thru2
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7w1516 Mounting Gp-Engine
7c6073 Pan Gp-Oil
7w2511 Rod & Piston Gp
7W***11Piston & Rod Group; Rod & Piston Gp1
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7c3736 Pulley Gp-Crankshaft
7w6204 Valve Mechanism Gp
Brakes And Drive Axle
9r5230 Axle As-Drive-Part 1 Of 2
9r5230 Axle As-Drive-Part 2 Of 2
9r6693 Axle As-Rear Drive-Part 1 Of 2
9r6693 Axle As-Rear Drive-Part 2 Of 2
9r1056 Axle Gp-Drive
9r5434 Brake Gp-Parking
9r0169 Control Gp-Differential Lock
9R***69Control Group-Differential Lock1
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9r0318 Control Gp-Parking Brake
9r0030 Control Gp-Foot Brake
9r1233 Guard Gp-Drive Shaft
9R***33Guard Group-Drive Shaft; -All Wheel Drive-All Wheel Steer1
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9r1231 Shaft Gp-Drive
02***87Fitting-Grease; (Universal Joint)1
05***13Spider & Bearing Group2
10***26Bolt; (M24x19.1-mm)8
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9r0033 Drive Shaft Gp
9r0720 Wheel & Tire Gp-Rear
5P***48Washer--Bracket To L.H. Support Rail16
6B***82Nut Cylinder Block To Head Assembly16
9R***20Wheel & Tire Group-Rear; -Rear1
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9r0976 Wheel & Tire Gp-Rear-L.H.
9R***76Wheel & Tire Group-Rear; -Rear, Lh1
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Chassis
9r0782 Battery Box Gp
9r0900 Bumper Gp-Front
9r0704 Counterweight Gp
9r5257 Cover Gp-Fender
9r2714 Door Gp-Side-Lh
9r2713 Door Gp-Side-Rh
9r2564 Enclosure Gp-Engine
9r2715 Fender Gp-Front
9r0014 Frame Gp-Loader
9r0015 Hood & Guard Gp
9r2712 Hood Gp
9r6976 Suppression Ar-Sound
4B***48Screw-Drive4
4B***58Screw (Identification Plate) Mounting4
7X***70Plate Group (Exterior Sound) (104)1
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Cooling
2w9715 Fan Gp-Suction
7w6224 Lines Gp-Water
2w9709 Mounting Gp-Radiator & Transmission Cooler
2W***09Mounting Group-Rad & Tmsn Cooler1
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7w6225 Pump Gp-Water
9y5837 Radiator Gp
Front Loader
9r0035 Arm Gp-Lift
9r0036 Brace Gp-Lift Cylinder
9r6091 Bucket Ar-Multi-Purpose
9R***12Lines Group-Bucket; Lines Gp-Bucket (Bottom Dump)1
9R***67Bucket Group-Multipurpose; Bucket Gp-Multi-Purpose1
9R***68Mounting Group-Bucket Cylinder; -Multipurpose Bucket1
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9r6088 Bucket Ar-Multi-Purpose
9R***07Lines Group-Hydraulic; Lines Gp-Hydraulic-Multi-Purpose Bucket.1
9R***93Control Group-Bucket; Control Gp-Bucket-Valve Multi-Purpose1
9R***88Bucket Ar-Multi-Purpose1
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9r5988 Bucket As-General Purpose
9r4667 Bucket Gp-Multi-Purpose
9R***67Bucket Group-Multipurpose; Bucket Gp-Multi-Purpose1
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9r5321 Edge Gp-Cutting
9r5137 Linkage Gp-Bucket-Front
9r1807 Lock Gp-Transport
Fuel System And Governor
9r0011 Control Gp-Governor & Accelerator
9R***11Control Group-Gov & Accelerator1
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7w7627 Filter Gp-Fuel
9r0019 Lines Gp-Fuel
7w6228 Lines Gp-Fuel Filter
7w6230 Lines Gp-Fuel Injection
7c2799 Pump Gp-Fuel
9y5809 Pump Gp-Fuel Injection
03***65Dowel1
03***57Stud3
03***08Gear1
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7c9634 Pump Gp-Fuel Injection
7w9458 Separator Gp-Water
9r0025 Tank Gp-Fuel
Hydraulics
9t3877 Valve Gp-Pressure & Flow Compensator
9T***77Valve Group-Press & Flow Cmpnstr; (Pressure, Flow Compensator)1
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9r1893 Control Gp-Multipurpose Bucket Valve
9R***93Control Group-Bucket; Control Gp-Bucket-Valve Multi-Purpose1
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9r4406 Control Gp-Backhoe
9R***06Control Group-Valve; Control-Additional Backhoe Circuit1
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9r2113 Control Gp-Valve-Mounting & Pedal-R.H.
9R***13Control Group-Valve; Control Gp-Valve-Mounting & Pedal-R.H1
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9r0216 Control Gp-Valve-Mounting & Pedal-L.H.
9R***16Control Group-Valve; Control Gp-Valve-Mounting & Pedal-L.H1
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9t1920 Conversion Gp-7 To 8
9T***20Conversion Group; Conversion-Field-7 To 8 Valve1
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9t1918 Conversion Gp-6 To 7
9t1919 Conversion Gp-6 To 8
9t1917 Conversion Gp-2 To 3
9T***17Conversion Group; Conversion-Field-2 To 3 Valve1
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7c2240 Cooler Gp-Hydraulic Oil
9r0069 Coupling Gp-Pump
9t5222 Cylinder Gp-Boom
9t7288 Cylinder Gp-Backhoe Bucket (Chg 05)
9t7288 Cylinder Gp-Backhoe Bucket (Chg 00)
9t4006 Cylinder Gp-Multipurpose Bucket-2 Required
9T***06Cylinder Group-Bucket; Cylinder Gp-Multi-Purpose Bucket1
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9t4809 Cylinder Gp-Extendable Stick
9T***09Cylinder Group-Extendable Stick1
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9t0415 Cylinder Gp-Loader Lift
9t7391 Cylinder Gp-Stabilizer-L.H.
9t7392 Cylinder Gp-Stabilizer-R.H.
9t7290 Cylinder Gp-Stick (Chg 00)
9t7290 Cylinder Gp-Stick (Chg 02)
4t6879 Cylinder Gp-Swing-L.H.
4t6879 Cylinder Gp-Swing-Lh
9t0529 Cylinder Gp-Swing-Rh
9t0529 Cylinder Gp-Swing-R.H.
9t5371 Cylinder Gp-Tilt
9r2717 Guard Gp-Boom Cylinder
9r2880 Guard Gp-Hose Lines
9r5560 Guard Gp-Stabilizer
9R***60Guard Group-Stabilizer Cylinder1
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9r3280 Guard Gp-Cylinder
9R***80Guard Group-Stabilizer Cylinder1
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Hydraulic Arrangements
9R***16Control Group-Valve; Control Gp-Valve-Mounting & Pedal-L.H1
9R***23Hydraulic Ar; Hydraulic Ar-60
9R***07Hydraulic Ar; Hydraulic Arrangement1
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9r0556 Kickout & Positioner Gp
9r7023 Lines Gp-Boom Cylinder-Part 1 Of 5
9r0072 Lines Gp-Boom Cylinder
9r7023 Lines Gp-Boom Cylinder-Part 4 Of 5
9r7023 Lines Gp-Boom Cylinder-Part 2 Of 5
9r7023 Lines Gp-Boom Cylinder-Part 5 Of 5
9r7023 Lines Gp-Boom Cylinder-Part 3 Of 5
9r3712 Lines Gp-Bucket-Bottom Dump
9R***12Lines Group-Bucket; Lines Gp-Bucket (Bottom Dump)1
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9r7022 Lines Gp-Bucket Cylinder
9r5610 Lines Gp-Bucket Cylinder
9r3996 Lines Gp-Check Valve
9r2962 Lines Gp-Cylinder
9r0142 Lines Gp-Hydraulic
9r1365 Lines Gp-Rear Hydraulic-3 Circuit-Part 2 Of 2
9r1365 Lines Gp-Rear Hydraulic-3 Circuit-Part 1 Of 2
9r7017 Lines Gp-Rear Hydraulic-3 Circuit-Part 2 Of 2
9r0207 Lines Gp-Hydraulic-Part 1 Of 2
9R***07Lines Group-Hydraulic; Lines Gp-Hydraulic-Multi-Purpose Bucket.1
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9r0207 Lines Gp-Hydraulic-Part 2 Of 2
9R***07Lines Group-Hydraulic; Lines Gp-Hydraulic-Multi-Purpose Bucket.1
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9r7017 Lines Gp-Rear Hydraulic-3 Circuit-Part 1 Of 2
9r3330 Lines Gp-Hydraulic Oil Cooler
9R***30Lines Group-Hydraulic Oil Cooler1
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9r3334 Lines Gp-Hydraulic Pump-Front-Part 2 Of 3
9r3334 Lines Gp-Hydraulic Pump-Front-Part 3 Of 3
9r3334 Lines Gp-Hydraulic Pump-Front-Part 1 Of 3
9r0055 Lines Gp-Lift Cylinder
9r6923 Lines Gp-Shutoff (Tuv)
9R***23Lines Group-Shutoff; Lines Gp-Shutoff (Tuv)1
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9r0057 Lines Gp-Stabilizer
9r0074 Lines Gp-Stick
9r0217 Lines Gp-Extendable Stick-Part 2 Of 2
9r0217 Lines Gp-Extendable Stick-Part 1 Of 2
9r0060 Lines Gp-Swing Cylinder
9r0059 Lines Gp-Tilt Cylinder
9r7030 Lock Ar-Boom
9R***23Lines Group-Boom Cylinder1
9R***30Lock Ar1
9T***47Valve Group; Valve Gp-61
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9r7077 Lock Ar-Boom
3D***24O-Ring - For Oil Drain & Level Plug (Items 3 & 7)2
9R***13Control Group-Valve; Control Gp-Valve-Mounting & Pedal-R.H1
9R***77Lock Ar-Boom1
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9r7075 Lock Ar-Boom
3D***24O-Ring - For Oil Drain & Level Plug (Items 3 & 7)2
9R***16Control Group-Valve; Control Gp-Valve-Mounting & Pedal-L.H1
9R***75Lock Ar-Boom1
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9r7203 Lock Ar-Boom
3D***24O-Ring - For Oil Drain & Level Plug (Items 3 & 7)2
9R***16Control Group-Valve; Control Gp-Valve-Mounting & Pedal-L.H1
9R***06Tube As1
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9r7205 Lock Ar-Boom & Stick
3D***24O-Ring - For Oil Drain & Level Plug (Items 3 & 7)2
9R***16Control Group-Valve; Control Gp-Valve-Mounting & Pedal-L.H1
9R***13Control Group-Valve; Control Gp-Valve-Mounting & Pedal-R.H1
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9r7202 Lock Ar-Boom Stick
9R***02Lock Ar-Boom & Stick1
9R***56Tube As1
9T***48Valve Group; Valve Gp-7 Bank1
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9r4668 Mounting Gp-Cylinder
9R***68Mounting Group-Bucket Cylinder; -Multipurpose Bucket1
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9r0421 Pedal Gp-Lock-L.H.
9r0459 Pedal Gp-Lock-R.H.
9t4833 Pump Gp-Piston Slipper
9r0064 Tank & Filter Gp-Hydraulic
9t8417 Valve Gp-6
9t7933 Valve Gp-Swing Control
9t8419 Valve Gp-8
9t9049 Valve Gp-8
9t9048 Valve Gp-7
9t9047 Valve Gp-6
9t6403 Valve Gp-Swing Control
9t8418 Valve Gp-7
9T***18Valve Group; Valve Gp-7 Circuit1
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9t7294 Valve Gp-Loader Control-3 Circuit
9T***94Valve Group-Bank; Valve Gp-Control-3 Circuit1
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9t7940 Valve Gp-8
9t7293 Valve Gp-Loader Control-2 Circuit
9t7939 Valve Gp-7
9t7938 Valve Gp-6
9t7936 Valve Gp-Pilot Operated
9t0718 Valve Gp-Relief-Crossover
9T***18Valve Group-Check & Relief; -Crossover1
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9t1700 Valve Gp-Pressure & Flow Compensator
9t7934 Valve Gp-Boom Control
9t0626 Valve Gp-Control
9t6401 Valve Gp-Control-Lift
9t4468 Valve Gp-Extendable Stick/Auxiliary Control
9t7292 Valve Gp-Control-Tilt
9t7171 Valve Gp-Bucket Control
9T***71Valve Group-Control; (Bucket Control)1
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9t7935 Valve Gp-Stick Control
9t7937 Valve Gp-Stabilizer Control-R.H. & L.H.
9T***37Valve Group-Control; (Stabilizer Control)1
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9t9046 Valve Gp-Control
9t9927 Valve Gp-Manual (Tuv)
9t0633 Valve Gp
9T***33Valve Group-Priority Flow Divider; (Priority)1
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9t8482 Valve Gp-Relief-Direct Operated
9t4752 Valve Gp-Relief
9t0634 Valve Gp-Relief-Return Restrictor
Intake And Exhaust System
2w9771 Air Cleaner Gp
7w2691 Air Cleaner Gp
9y5841 Lines Gp-Air
7w4476 Manifold Gp-Exhaust
7w4477 Manifold Gp-Inlet
9y0253 Muffler Gp
7c3446 Turbocharger Gp
7c3465 Turbocharger Gp
Lubrication System
7c2905 Oil Cooler & Filter Base Gp
7C***05Cooler Group-Filter Base & Eng Oil1
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7w6220 Filler Gp-Engine Oil
7W***20Filler Group-Oil; Filler Gp-Engine Oil1
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7w6218 Fumes Disposal Gp
7w6215 Gauge Gp-Oil Level (Dipstick)
7W***15Gauge Group-Oil Level (Dipstick)1
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7e1409 Lines Gp-Engine Oil
2w7670 Lines Gp-Engine Oil
1w8357 Pump Gp-Engine Oil
Operator Platform
9r6881 Bar Gp-Latch
9r2817 Cab & Platform Ar
9R***73Visor Group-Cab1
9R***71Fan Group-Circulating1
9R***17Cab & Platform Ar1
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9r2720 Cab & Platform Ar
9R***18Lighting Group-Roading1
9R***73Wiper Group1
9R***74Mirror Group-Rear View1
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9r1045 Cab Ar
9R***23Lines Group-Heater1
9R***44Heater Group-Cab1
9R***45Cab Ar1
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9r1080 Cab Ar
9R***23Lines Group-Heater1
9R***44Heater Group-Cab1
9R***74Console Group-Front; Console Gp-Front Cab1
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9r5645 Cab Gp-Part 2 Of 3
9r5645 Cab Gp-Part 3 Of 3
9r5649 Cab Gp-Part 1 0f 3
9r5649 Cab Gp-Part 2 Of 3
9r5645 Cab Gp-Part 1 Of 3
9r5649 Cab Gp-Part 3 Of 3
9r1074 Console Gp-Front Cab
9R***74Console Group-Front; Console Gp-Front Cab1
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9r0013 Console Gp-Front-Rops
9r0482 Console Gp-Rear
9r0547 Console Gp-Instrument
9r2815 Control Gp-Backhoe
9r0043 Control Gp-Hydraulic Hand
9r0044 Control Gp-Hydraulic Hand
9r0031 Control Gp-Steering & Shuttle
9r4404 Control Gp-3 Lever Foot Swing
9r4404 Control Gp-Swing
9r0979 Control Gp-Transmission Hand
9r4405 Control Gp-Valve
9r1036 Conversion Gp-Non Rops
9G***69Housing As. 8 Pin. Including;-0
9G***95Plug-Insert Into Housing To Close Holes0
9R***36Conversion Group-Non-Rops1
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9r2461 Cushion Gp-Arm
9r5651 Door Gp-Cab L.H.-Part 1 Of 2
9r5650 Door Gp-Cab R.H.-Part 2 Of 2
9r5651 Door Gp-Cab L.H.-Part 2 Of 2
9r5650 Door Gp-Cab R.H.-Part 1 Of 2
9r5542 Door Gp-L.H.
9r5543 Door Gp-R.H.
5d2855 Fan As-Defroster
9r2571 Fan Gp-Circulating
9r2608 Floormat Gp
9r2722 Floorplate Gp
9r1044 Heater Gp-Cab
6t7884 Heater Gp-Part 2 Of 2
6t7884 Heater Gp-Part 1 Of 2
9r0017 Instrument Gp
9r7930 Instrument Gp
9r6494 Kit-Rail Conversion (Slide)
9R***94Kit-Rail Conversion; Kit-Conversion-Rail (Slide)1
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9r6507 Kit-Rail Conversion (Slide)
9R***07Kit-Rail Conversion; Kit-Conversion-Rail (Slide)1
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9r6506 Kit-Rail Conversion (Slide)
9R***06Kit-Rail Conversion; Kit-Conversion-Rail (Slide)1
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9r6489 Kit-Rail Conversion (Slide)
9R***89Kit-Rail Conversion; Kit-Conversion-Rail (Slide)1
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9r6800 Kit-Relay-Side Console
3S***93Strap-Cable-To Tie Harnesses Together4
5P***23Wire 4.55m (Br/Bk2); (1-Conn. Ether Starting System Sending Unit / 1-Conn. Solenoid Valve Ether Start System)0
7X***02Switch As-Magnetic1
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9r0223 Lines Gp-Heater
9r1806 Lock Gp-Hydraulic Hand Control
9R***06Lock Group-Hydraulic Hand Control1
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9r6059 Mirror Gp-Rear View-Canopy
9r6144 Mirror Gp-Exterior-Cab
9r5158 Mirror Gp-Rear View
9r1574 Mirror Gp
6v6561 Wiper Pivot Gp-Sensor
6V***61Pivot Group-Wiper Arm; (Wiper Arm)1
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9r5730 Platform Gp-Cab
9r5648 Platform Gp-Cab
9r2721 Platform & Rollover Ar
9R***18Lighting Group-Roading1
9R***23Rops Group; Rops Gp-Protection1
9R***74Mirror Group-Rear View1
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9r0023 Rops Gp
9r0024 Seat Gp-Reversible
9r6486 Seat Gp-Static
9r5714 Seat Gp-Static
9r6487 Seat Gp-Suspension-Vinyl
9r6488 Seat Gp-Suspension-Cloth
9r5716 Seat Gp-Suspension-Cloth
9r2653 Seat Gp-Suspension
9r5715 Seat Gp-Suspension-Vinyl
9r2652 Seat Gp-Suspension-Cloth-With Armrest
9r2390 Speedometer Gp
9r0675 Tachometer Gp-Electric
9r1573 Visor Gp-Cab
9r2100 Washer Gp-Windshield
9r0673 Wiper Gp-Part 1 Of 2
9r0673 Wiper Gp-Part 2 Of 2
6t6530 Wiper Gp-Windshield
9r1172 Wiring Gp-Wiper
Service Equipment And Supplies
Name Plates & Transfers
1P***07Film-Symbol; 2 On Bottom Of Upper Frame Below Engine. 2 On Front Of Upper Frame Above Boom Articulation4
2H***57Tag-Antifreeze1
5P***10Film-Caution; Below Heat Start Switch On Dash1
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Starting And Electrical System
7t2876 Alternator Gp-Charging
2w9774 Alternator Gp
9r0028 Battery & Wiring Gp-Part 3 Of 3
9r0028 Battery & Wiring Gp-Part 1 Of 3
9r0028 Battery & Wiring Gp-Part 2 Of 3
9r1216 Battery Gp-Heavy Duty
9r1195 Battery Gp-Heavy Duty
9r0016 Horn Gp-Electric
7t0618 Lamp Gp
7t7104 Lamp Gp-Head & Turn-12 Volt-R.H.
7x6108 Lamp Gp-Head & Turn-12 Volt-L.H.
7x6109 Lamp Gp-Head & Turn-12 Volt-R.H.
7t7103 Lamp Gp-Head & Turn-L.H.
9r1426 Lighting Gp-Front Work
9R***26Lighting Group-Front; Lighting Gp-Front Work1
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9r3407 Lighting Gp-Rear Work
9r2124 Lighting Gp-Roading
9r0018 Lighting Gp-Roading-Canopy
9r6510 Lighting Gp-Roading-L.H. Dip
7X***08Lamp Group-Head & Turn; -Lh1
7X***09Lamp Group-Head & Turn; -Rh1
9R***10Lighting Group-Roading; -Lh Dip1
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9r1215 Lighting Gp-Warning
9r6474 Starting Aid-Ether
7x1361 Starting Motor Gp-Electric
7n8000 Switch As
7N***00Switch As-Toggle; (Warning Light)1
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7n8001 Switch As
7N***01Switch As-Toggle; -Prelubrication Override-Crank Override1
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9g7641 Switch Gp
9G***41Switch Group-Start; -Engine, Key-Vims Service1
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9r0026 Warning Gp-Backup
9r2818 Wiring & Lighting Gp
9R***18Wiring & Lighting Group; Wiring Gp-Lighting & Roading1
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Steering
9r4048 Axle As-Drive & Steer-Part 2 Of 3
9r4048 Axle As-Drive & Steer-Part 1 Of 3
9r4048 Axle As-Drive & Steer-Part 3 Of 3
9r4047 Axle Gp-Drive & Steer
9R***25Bearing - Sleeve2
9R***47Axle Group-Drive & Steering-Front1
9R***48Axle As-Drive & Steering1
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9r0010 Axle Gp-Front
9t1493 Cylinder Gp-Steering
9r5605 Drive Ar-Front Wheel
6Y***98Transmission Group-Direct Drive; Transmission Gp1
8C***84Film - Identification2
9R***83Wiring Group-Front; Wiring Gp-Front Drive1
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9r0061 Lines Gp-Steering-Part 1 Of 2
9r0061 Lines Gp-Steering-Part 2 Of 2
9r1232 Lines Gp-Steering
4t6896 Pump Gp-Metering
9r2047 Steering Gp-Hydraulic
9r5603 Wheel & Tire Ar
9R***20Wheel & Tire Group-Rear; -Rear1
9R***03Wheel & Tire Ar1
9R***93Wheel & Tire Group-Front1
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9r6190 Tire & Wheel Gp-Front
5P***48Washer--Bracket To L.H. Support Rail16
6B***82Nut Cylinder Block To Head Assembly16
9R***90Wheel & Tire Group-Front; -Front1
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9r1287 Wheel & Tire Gp-Front
5P***48Washer--Bracket To L.H. Support Rail16
6B***82Nut Cylinder Block To Head Assembly16
9R***87Wheel & Tire Group-Front; -Front1
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9r6191 Wheel & Tire-Front-L.H.
9R***91Wheel & Tire Group-Front; -Front, Lh1
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9r6492 Wheel & Tire Gp-2 Required
9r6493 Wheel & Tire Gp-Front
5P***48Washer--Bracket To L.H. Support Rail16
6B***82Nut Cylinder Block To Head Assembly16
9R***92Wheel & Tire Group-Front2
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9r1306 Wheel & Tire Gp-Front-L.H.
9R***06Wheel & Tire Group-Front; -Front, Lh1
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9r2730 Wheel & Tire Gp-Front-L.H.
9R***30Wheel & Tire Group-Front-Lh; -Front, Lh1
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9r0983 Wiring Gp-Front Drive
9R***83Wiring Group-Front; Wiring Gp-Front Drive1
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Transmission
9w1355 Drive Gp-Flexible
9r1040 Filler Gp-Power Train Oil
9r0032 Lines Gp-Power Train Oil Cooler
9w8111 Mounting Gp-Transmission
6t9519 Solenoid As
3t9608 Torque Converter As
9w3329 Transmission Ar
3T***08Torque Converter As1
8E***35Torque Converter As1
9W***55Drive Group-Flexible Coupling1
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9w7920 Transmission Gp-Part 2 Of 3
9W***20Transmission Group; Transmission Gp-Direct Drive1
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9w7920 Transmission Gp-Part 3 Of 3
9W***20Transmission Group; Transmission Gp-Direct Drive1
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9w7920 Transmission Gp-Part 1 Of 3
9W***20Transmission Group; Transmission Gp-Direct Drive1
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6y2598 Transmission Gp-Direct Drive-Part 1 Of 4
6Y***98Transmission Group-Direct Drive; Transmission Gp1
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6y2598 Transmission Gp-Direct Drive-Part 4 Of 4
6Y***98Transmission Group-Direct Drive; Transmission Gp1
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6y2598 Transmission Gp-Direct Drive-Part 3 Of 4
6Y***98Transmission Group-Direct Drive; Transmission Gp1
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6y2598 Transmission Gp-Direct Drive-Part 2 Of 4
6Y***98Transmission Group-Direct Drive; Transmission Gp1
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9w6500 Valve Gp-Transmission Control
6y7468 Valve Gp-Transmission Control
6Y***68Valve Group-Pressure Compensator; (1/8-27thd Hex-Countersunk)1
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436 serial number reference

On Cat 400-series backhoe loaders of this era (pre-2001), the PIN/serial plate sits on the frame near the cab, above the base of the loader/cylinder arm. Most models in this range, including the 436, use the left-side plate location; the early 416-series machines used the right side instead, so check both sides if the plate isn't where expected. The PIN/serial number reads as an 8-character code: the first three alphanumeric characters are the prefix identifying the model and build block, and the trailing five digits are the individual unit's running sequence number within that block.

PrefixIdentifies
5KF436 (base, pre-Series II), serial 00001-00805
5KF436 Series II, serial 00806-up

Frequently asked questions

What engine powers the Caterpillar 436 backhoe loader?

The base 436 and 436 Series II both use a naturally aspirated, Perkins-built Cat 4.236 diesel: a 3.86 L (236 cu in) 4-cylinder, direct-injection engine rated 61.9 kW (83 hp) gross and 57.4 kW (77 hp) net. It has no turbocharger and no electronic engine control.

What is the operating weight of the Caterpillar 436?

About 6,878 kg (15,163 lb) for the standard 2WD wheeled configuration.

What replaced the Caterpillar 436?

Cat carried the platform forward through a Series II running change within the same 5KF serial block before moving to the 436B and later the 436C, which added a turbocharged engine and updated hydraulics. There is no single confirmed direct successor model number beyond that generational continuation within the 43x backhoe loader family.

What 436 owners discuss

What's a known drivetrain quirk on the Cat 436 power-shuttle transmission?
Owners report intermittent loss of drive in both directions after the machine has been running a while, then normal operation returns once it sits and cools for a few minutes. It's usually not a fluid problem - one owner had already changed oil and filter and found the shifting module clean, with no metal in the old fluid. A separate common complaint is forward working fine while reverse won't engage at all. Techs point first at the shifting module and the forward/reverse clutch packs: on manual-shift units a slipping clutch is the top suspect, on electric-shift units swapping the forward and reverse valves on the valve body will tell you whether the fault follows the valve or stays with the clutch. A shop can pressure-test the clutches with air to confirm a leaking clutch seal before pulling the transmission apart. Have your dealer verify clutch pressures before committing to a rebuild.
Any quirks in how the loader and backhoe hydraulics interact on the base 436?
The implement hydraulic circuit on this generation (covered in Cat's own combined hydraulics manual for the 416, 426, and 436) uses ball-type shuttle valves, which Cat calls resolvers, to prioritize flow when more than one function is worked at once. Operators use this as a built-in diagnostic: run the backhoe, then raise the loader - if the backhoe speeds up while the loader is being worked, a resolver ball isn't seating and moving freely. A stuck or worn resolver also shows up as one function taking full pump pressure the instant a second function is engaged, or a function that won't move at all. Reseating or reseal­ing the resolver is a straightforward job accessed from underneath the machine and doesn't require splitting anything. Have your dealer verify hydraulic pressures before opening the valve body.
What's the reputation of the 4.236 diesel used in the base 436?
The naturally aspirated, Perkins-built 4.236 has a strong reputation for a long-lived block. Owners of related Cat machines running the same engine report tens of thousands of hours with only wear-item replacement - water pumps, an injection pump, and sets of injectors over the engine's life - rather than major internal failures. A little white smoke on a cold start is normal for this naturally aspirated engine, since fuel takes a moment to atomize fully before the block reaches temperature. Smoke that persists after warm-up points to a fuel delivery problem: worn or carbon-fouled injector tips, injection pump timing drift, or water/ice contamination in the fuel from condensation in cold weather. Because it's naturally aspirated there's no turbocharger to fail, which owners note is one less wear item than on later turbocharged engines built on the same block family.
What wear patterns show up on the tires, axles, and brakes on this machine?
As a 2WD wheeled backhoe there's no track undercarriage to inspect - wear concentrates in the tires, front axle pivots, and the enclosed multiple-disc service brakes. Front tire wear is often uneven because the machine spends much of its working life digging with stabilizers down and the front axle unloaded, then loading with the front axle heavily loaded, so check tread depth and sidewall cracking on both axles independently. The service brakes are fully enclosed multi-disc units running in axle housing oil, so they don't degrade from dust and mud exposure the way open brakes do, but the parking brake is a separate mechanical unit and should be checked on its own for holding force. Front axle kingpins and tie-rod ends are grease points, and the recurring theme among owners is that frequent greasing is far cheaper than replacing worn pins and bushings later. Have your dealer verify brake holding force and kingpin play before returning the machine to work.
What electrical issues come up on a machine this age?
The base 436 predates the sensor-heavy electronics on later Cat backhoes, so the wiring is simple - a handful of switches for oil pressure and coolant temperature feeding mechanical gauges, rather than a network of sensors and control modules. Most electrical complaints on machines this age trace back to basics: corroded grounds, a starter cooked by extended cranking beyond its intended duty cycle, or an alternator whose bearings have worn from vibration and heat until the rotor drags or seizes. Owners recommend checking battery terminals, ground straps, and the starter/alternator connections first before assuming a gauge or switch itself has failed. Have your dealer verify charging system output and starter draw if starting or gauge behavior seems off.
What should a buyer check before purchasing a used Cat 436?
Pull maintenance records first - they show what's already been fixed and what's coming due. Run every hydraulic function together (loader, backhoe, stabilizers, swing) to check for the resolver symptoms owners describe: a function that won't move, or one that takes full pump pressure the instant a second function is engaged. Shift the transmission through forward and reverse under load, then let the machine idle to see if drive is lost once it warms up. Inspect tire tread and sidewalls on both axles, check for oil weeping around the stabilizer cylinder rod ends and at the fitting on the base of the cylinder body, and grease every pin and bushing point on the loader arm and backhoe linkage to feel for looseness. Because parts and service literature for this generation remain widely available and the machine is mechanically simple, a well-maintained example with intact records is usually a safe buy even at high hours. Have your dealer verify structural and hydraulic condition with a pre-purchase inspection.
What's the single biggest factor owners point to for long-term reliability?
Grease discipline. Across owner discussions the recurring theme is that this generation of backhoe loader is mechanically simple and will run a long service life if pins, bushings, and u-joints are greased on schedule - skipping grease intervals is what turns a cheap maintenance habit into an expensive pin-and-bushing replacement job on the loader arm and backhoe linkage. Combined with routine oil and filter changes and keeping water out of the fuel, that's what owners credit for machines still working well past the hours where comparably aged equipment starts needing structural repair.

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

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