Caterpillar 950G
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 950G is a medium wheel loader in Cat's 3-4 cu yd (2.3-3.1 m³) bucket class, used for loading, load-and-carry, and general material handling on quarry, aggregate, and construction sites. The first-series 950G (about 1998 through 2001/2002) runs a Cat 3126 DITA turbocharged diesel rated at 134 kW (180 hp) gross / 147 kW (197 hp) net; published output figures vary slightly by source and rating standard. The 950G Series II (about 2002 through 2005/2006) carries the Tier 2 Cat 3126B with air-to-air aftercooling, rated near 136 kW (183 hp) net. Operating weight for the family runs around 17,782 kg (39,203 lb), varying with bucket, counterweight, and tire selection. The 950G replaced the 950F/950F II, which used the Cat 3306 engine, and was itself replaced by the 950H. Cat offered the 950G with standard-lift and high-lift boom arrangements and a range of general-purpose, multi-purpose, and light-material buckets plus forks and other work-tool options.
The move from 950F to 950G swapped the mechanically governed 3306 for the electronically controlled 3126 platform, adding onboard diagnostics and Cat Monitoring System integration onto the same articulated, four-wheel-drive, powershift-transmission chassis layout. Within the G-series itself, Series II replaced the 3126 DITA with the air-to-air aftercooled 3126B to meet Tier 2 emissions, changing cooling-system layout and fuel-system components along with it. The 950G remains a common sight in the used and parts market: its 3126/3126B engine shares parts with a wide range of Cat truck and industrial engines, its axle, transmission, and hydraulic components carry over closely across the G-series, and enough units remain in quarry and aggregate service that rebuilt and used parts stay in steady circulation even though the model line has been out of production for close to two decades.
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 950G specifications
Engine
| Engine model (950G, 1998-2001) | Cat 3126 DITA, inline 6-cylinder turbocharged direct-injection diesel with aftercooling |
| Gross power (950G) | 134 kW (180 hp) |
| Net power (950G) | 147 kW (197 hp) |
| Engine, later production (950G Series II, 2002-2005) | Rating varies by market/build: some 950G Series II units continue the 3126 DITA rating (134 kW/180 hp gross, 147 kW/197 hp net); others use a 3126B ATAAC (air-to-air aftercooled) variant rated 136 kW (183 hp) net. Verify against the engine serial plate. |
| Displacement | 7.2 L (439-442 cu in), 6 cylinders inline |
| Emissions tier | Base 950G predates formal nonroad emissions-tier certification for its power class. The 3126B ATAAC variant used on later Series II builds is EPA Tier 2 certified. |
Weights
| Operating weight | approx. 17,782 kg (39,203 lb); rounds to about 17.9 t in general listings |
Dimensions
| Transport length (bucket on ground) | 8.03-8.05 m (26.3-26.4 ft) |
| Transport width (over tires) | 2.75-2.90 m (9.0-9.5 ft), varies by tire size and whether measured over or between tires |
| Height to top of cab | 3.50-3.51 m (11.5 ft) |
| Ground clearance | 0.40-0.43 m (1.3-1.4 ft) |
Performance
| Maximum forward travel speed | 37 km/h (23 mph) |
| Maximum reverse travel speed | 40.5 km/h (25.2 mph) |
| Static tipping load, full turn | 10,407-12,195 kg (22,944-26,884 lb), varies by bucket and counterweight configuration |
| Breakout force | approx. 14,880 kgf / 145.9 kN (32,810 lbf) |
Service capacities (summary)
| Fuel tank | 295 L (78 gal) |
| Hydraulic system (total) | 153 L (40.5 gal) |
| Engine oil (crankcase) | 30.3 L (8 gal) |
| Cooling system | 49.2 L (13 gal) |
| Transmission | 34.1 L (9 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
950G fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 30 L (8 US gal) | Cat DEO (Diesel Engine Oil). Multigrade SAE 15W-40 for ambient temperatures above roughly -18 C (0 F); SAE 10W-30 for colder climates. Select grade from the machine's ambient-temperature viscosity chart, based on coldest expected start-up temperature. |
| Cooling system | 49 L (13 US gal) | Cat ELC (Extended Life Coolant), premixed 50/50 water-glycol, is the preferred fill. Cat DEAC (conventional heavy-duty antifreeze/coolant) is the lower-cost alternative. Do not mix ELC and DEAC in the same system. |
| Fuel tank | 295 L (78 US gal) | No. 2-D diesel fuel meeting Cat's diesel fuel specification. Switch to a lighter winter-blend or No. 1-D distillate in cold weather to prevent fuel gelling and filter plugging. |
| Transmission (powershift) | 34 L (9 US gal) | Cat TDTO (TO-4 transmission/drive-train oil). SAE 10W in cold ambient conditions, SAE 30 in normal to warm climates, per the viscosity-by-temperature chart. |
| Front differential and final drive | 36 L (9.6 US gal) | Cat TDTO (TO-4). Same cold/warm viscosity selection as the transmission - SAE 10W cold, SAE 30 normal to warm. |
| Rear differential and final drive | 36 L (9.6 US gal) | Cat TDTO (TO-4). Same cold/warm viscosity selection as the transmission - SAE 10W cold, SAE 30 normal to warm. |
| Hydraulic tank | 88 L (23.3 US gal) | Cat TDTO (TO-4), the shared fluid family also used in the transmission and final drives on this machine's implement and steering hydraulic circuit. Grade follows the same cold/warm viscosity chart. |
| Hydraulic system, including tank and lines | 153 L (40.5 US gal) | Cat TDTO (TO-4); total system fill covering tank, lines, and cylinders. |
| Grease, all lubrication points | Spec only - no single reservoir; serviced per fitting | Cat Multipurpose Grease (NLGI 2, lithium-complex base) for standard chassis, linkage, and pin points. Cat Advanced 3Moly Grease at medium-load, high-articulation points such as the bucket linkage and articulation joint where the manual calls for a moly-fortified grease. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 950G maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 6,000 h |
|
Servicing the 950G beyond the schedule
Predictive Maintenance & Fluid Analysis
Run S·O·S sampling on engine, transmission, axle, and hydraulic oil at every scheduled interval; the 3126/3126B's HEUI fuel system and torque converter both show wear trends in oil analysis before they show up as complaints. Watch torque converter outlet temperature under load - repeated spikes point toward converter or cooler fade rather than engine trouble, especially on early 3126 DITA units. On Series II 3126B machines, track fuel pressure regulator condition; a weeping regulator O-ring shows up first as overnight hard starting, not a fault code.
Corrective & Common Repairs
Common 950G complaints trace to a handful of repeatable faults. First-series machines can lose power under load as the torque converter heats up; check converter outlet pressure and cooler flow before condemning the engine. Series II 3126B engines with overnight hard-starting usually need the fuel pressure regulator O-ring replaced. Loader-arm faults often trace to the lift lever position sensor or implement pilot pressure supply solenoid rather than the pump. Steering that feels soft or delayed at low pilot pressure can point to the hydraulic neutralizer valve.
Overhaul & Rebuild Points
Plan major rebuild dollars around the powershift transmission and torque converter, front and rear axle differentials and planetary final drives, and the main hydraulic control valve - these carry the bulk of wear on a machine running load-and-carry duty cycles. Articulation joint pins and bushings, lift/tilt cylinder pins, and axle oscillation trunnions wear steadily under articulated steering and need periodic bushing replacement, not just grease. On the engine side, budget for injector, turbocharger, and valve-train work on either the 3126 DITA or 3126B once hours climb past normal service life.
Seasonal & Environment Servicing
In cold climates, verify coolant freeze protection and use the correct winter-grade engine, transmission, and hydraulic oil viscosity to avoid slow torque converter response and hard HEUI starts on the 3126/3126B. Block heaters and ether-assist starting aids help below-freezing starts. In hot, dusty quarry environments, clean the radiator, hydraulic oil cooler, and torque converter oil cooler cores often - the torque converter's known heat-fade tendency gets worse with a plugged core. Wash accumulated fines from the articulation joint and axle housings to keep grease doing its job.
950G fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 110-3 | Engine coolant temperature sensor circuit reads voltage above the normal range | Open circuit or short to a voltage supply in the sensor wiring or connector; less often a failed sensor | Inspect the sensor connector and harness for corrosion or chafing, verify sensor resistance against spec, replace the sensor if wiring checks out good |
| 100-1 | Engine oil pressure reading below the normal operating range for current engine speed | Low oil level, worn oil pump, plugged oil filter, or a failing oil pressure sensor giving a false low reading | Check oil level and condition first, confirm actual pressure with a mechanical gauge before condemning the sensor; shut engine down if pressure is genuinely low to avoid bearing damage |
| 190-8 | Engine speed/timing sensor signal is missing, erratic, or out of the expected frequency range | Incorrect sensor air gap, damaged sensor tip, chafed harness, or a failed camshaft speed/timing sensor | Check sensor gap and mounting, inspect harness and connectors, test and replace the sensor per the engine troubleshooting procedure |
| 102-3 | Boost (intake manifold) pressure sensor circuit reads voltage above the normal range | Open circuit, chafed harness, or corroded connector on the boost sensor circuit; occasionally a failed sensor | Inspect wiring and connector, verify sensor supply voltage and signal against spec, replace sensor if the circuit checks out |
| 111-11 | Coolant level sensor reports coolant level below the low-level threshold | Actual coolant loss from a leak, or a fouled/failed coolant level sensor giving a false reading | Check coolant level and inspect for external or internal leaks before servicing the sensor; top up with the correct coolant and pressure-test the system if level is genuinely low |
| 91-4 | Throttle position sensor circuit reads voltage below the normal range | Short to ground, damaged wiring, or a worn/failed throttle position sensor | Inspect harness and connector for shorts or damage, check sensor calibration, replace sensor if wiring is sound |
| 1-5 through 6-5 | Injector solenoid on the numbered cylinder reads current below normal or open circuit | Failed injector solenoid winding, damaged injector harness, or a loose/corroded injector connector | Check injector wiring and connector, test solenoid resistance, replace the injector if the solenoid circuit is open; engine may run rough or lose power on that cylinder until repaired |
| 352-13 | Lift lever position sensor is out of calibration or the lever was not centered when the machine was powered up | Lift lever not in the hold/neutral position at key-on, or the position sensor has drifted out of calibration | Center the lift lever at key-on and cycle power; if the code persists, recalibrate the lever position sensor with the diagnostic service tool |
| 358-5 | Implement pilot pressure supply solenoid reads current below normal or an open circuit | Failed solenoid coil, damaged wiring to the pilot pressure supply solenoid, or a loose connector | Inspect the solenoid wiring and connector, check coil resistance against spec, replace the solenoid if the circuit is open; expect reduced or no implement response until repaired |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
950G attachments & work tools
General-purpose (GP) buckets
Standard work tool for the 950G class; heaped capacity runs roughly 2.7-4.0 m3 (3.5-5.2 yd3) depending on width and series, with a 2.7-3.5 m3 (3.5 yd3) bucket as the common base configuration. Overall bucket width is about 2.93 m (9.6 ft), sized for truck loading and stockpile work in this loader's weight class.
Multi-purpose (4-in-1) bucket
Bucket front half splits and is cylinder-actuated so it can clamp material, meter out fill, doze with an angled inner edge, or close flush to load like a standard bucket. Runs off the machine's auxiliary hydraulic circuit rather than the base lift/tilt lines.
Grapple bucket
Adds a pair of ladder-style clamp tines over a bucket floor for handling loose, bulky, or awkward material such as brush, scrap, or demolition debris. Uses the same auxiliary hydraulic circuit as the multi-purpose bucket to power the clamp.
Pallet forks / fork carriage
Carriage-mounted forks pin or coupler-mount to the loader arms for palletized and unit loads; field carriages built for this size class run roughly 2.4-2.5 m (94-100 in) wide. Standard bucket-type mounting geometry lets forks swap with buckets on the same coupler.
Quick coupler / mounting system
Factory hydraulic quick coupler uses a pin-on/pin-grabber interface with steel hydraulic lines and an in-cab electric actuator plus lockout switch, letting the operator swap buckets, forks, and grapples without leaving the seat. Hook spacing is shared across this size class, so tools sized for the 950H and 962G/H also fit.
Auxiliary hydraulics (third-valve) kit
Multi-function tools such as the multi-purpose bucket and grapple need the machine's auxiliary/third-valve hydraulic circuit and an in-cab control to actuate clamp or tilt cylinders. Base loader hydraulics (lift and tilt only) will not run these tools without the added circuit.
Waste Handling Arrangement (WHA)
Factory package aimed at transfer stations, scrap yards, and demolition sites: tilt-cylinder guard, front-frame guard over the hydraulic lines, an engine service wall, and airborne-debris cooling with hinged/swinging cooler cores. Adds a quick-replaceable glass cab with grommet-mounted front and rear windows, plus crankcase and powertrain guards that raise and lower electrically for cleaning access.
High-lift arrangement
Optional boom/linkage configuration giving extra dump clearance, reach, and overall machine length versus the standard-lift loader, useful for loading over high truck sideboards or taller stockpiles. Available bucket capacity for a given breakout force typically trades off against the standard-lift bucket.
Ride control
Optional accumulator-based boom ride control smooths bucket pitching when traveling loaded at speed, cutting spillage and operator fatigue. Offered as a factory attachment/option across this loader class.
Traction aids
No-Spin rear differential and limited-slip differential options are available for low-traction underfoot conditions such as mud, snow, or loose fill; selection depends on application and configuration.
Airborne debris / radiator guarding
Heavy-duty debris grille with fine perforation (around 4 mm) shields the radiator core from chips, dust, and airborne debris in wood-waste or recycling settings. An optional finer-fin debris/air-conditioner cooler core is available for higher-debris environments.
All 950G assemblies by section
Every catalogued assembly group for the Caterpillar 950G. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Braking System
118-2291 Brake Gp-Parking
| 11***91 | Brake Group-Parking | 1 |
| 3B***12 | Lockwasher (3/4") Transfer Gear Case To Frame Mounting | 2 |
| 5D***41 | Camshaft | 1 |
Electrical And Starting System
100-3055 Sensor Gp-Temperature
| 10***55 | Sensor Group-Temperature; -Front Brake Oil-Torque Converter Oil-Transmission Oil-Aftercooler-Axle Oil-Rear Brake Oil | 1 |
| 8T***29 | Pin-Connector; (16-Ga To 18-Ga)(Throttle Position Sensor) | 3 |
| 8T***32 | Receptacle-Connector; (3-Pin)(Throttle Position Sensor) | 1 |
162-2956 Switch Gp-Ride Control
| 16***56 | Switch Group-Ride Control | 1 |
| 3E***80 | Actuator-Rocker | 1 |
| 3E***25 | Lamp; (24-Volt) | 1 |
Frame And Body
126-7724 Counterweight Gp
| 10***96 | Pin-Keeper | 1 |
| 12***24 | Counterweight Group | 1 |
| 12***59 | Counterweight | 1 |
Hydraulic System
162-2298 Accumulator & Mtg Gp-Ride Cont
| 06***35 | Valve-Gas | 1 |
| 10***33 | Accumulator As-Ride Control | 1 |
| 11***78 | Plate | 1 |
147-5148 Control Ar-Ride
| 12***35 | Lines Group-Ride Control | 1 |
| 14***19 | Valve & Mtg Group-Main Control; -3-Function, Logging | 1 |
| 14***23 | Valve & Mtg Group-Main Control; -3-Function, With Ride Control | 1 |
175-5937 Control Gp-Pilot Operated Hyd -Custom
| 12***80 | Cover Assem. | 1 |
| 14***41 | Control Group-Pilot Operated Hydraulic; -3-Function | 1 |
| 15***00 | Control Group-Pilot Operated Hydraulic; -2-Function | 1 |
153-0401 Control Gp-Pilot Operated Hyd
| 10***06 | Screw-Pan Head; (6-19x0.37-In) | 4 |
| 10***36 | Rod | 2 |
| 10***40 | Rod | 1 |
146-0041 Control Gp-Pilot Operated Hyd
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***06 | Screw-Pan Head; (6-19x0.37-In) | 4 |
| 12***01 | Knob; (Auxiliary) | 2 |
153-4948 Cylinder & Seal Gp-Tilt
| 15***06 | Cylinder Group-Tilt | 1 |
| 15***48 | Cylinder & Seal Group-Tilt; -Logging | 1 |
| 7K***10 | Seal-Lip; (82.55 Id) | 2 |
151-8206 Cylinder Gp-Tilt
| 15***06 | Cylinder Group-Tilt | 1 |
| 15***07 | Rod Assem. | 1 |
| 15***08 | Cylinder Assem. | 1 |
147-5143 Hydraulic Ar-Ride Control
| 12***38 | Lines Group-Front | 1 |
| 14***15 | Arm As-Lift | 1 |
| 14***19 | Valve & Mtg Group-Main Control; -3-Function, Logging | 1 |
126-7738 Lines Gp-Front
| 12***38 | Lines Group-Front | 1 |
| 13***19 | Plate | 1 |
| 13***34 | Tube Assem. | 1 |
145-2805 Lines Gp-Pilot
| 14***98 | Hose Assem. | 1 |
| 14***99 | Hose Assem. | 1 |
| 14***05 | Lines Group-Pilot; -3-Valve | 1 |
126-7735 Lines Gp-Ride Control
| 12***35 | Lines Group-Ride Control | 1 |
| 13***12 | Hose Assem. | 1 |
| 13***14 | Hose Assem. | 1 |
151-0884 Lines Gp-Tilt Cylinder
| 14***86 | Tube Assem. | 1 |
| 14***87 | Tube Assem. | 1 |
| 14***88 | Bracket | 2 |
144-4023 Valve & Mtg Gp-Main Control
| 12***79 | Valve Group-Main Control; (3-Function)(Lift, Tilt & Auxiliary) | 1 |
| 12***36 | Pipe | 1 |
| 12***78 | Tee-O-Ring Port | 1 |
144-4019 Valve & Mtg Gp-Main Control
| 12***79 | Valve Group-Main Control; (3-Function)(Lift, Tilt & Auxiliary) | 1 |
| 12***24 | Tube Assem. | 1 |
| 13***34 | Tube Assem. | 1 |
118-5095 Valve Gp-Control
| 09***91 | Bolt; (Locking) (M12x1.75x25mm) | 1 |
| 10***83 | Spring; (Outer) | 1 |
| 11***95 | Valve Group; (Auxiliary)(Auxiliary) | 1 |
160-7116 Valve Gp-Diverter
| 16***16 | Valve Group-Diverter; -Ride Control | 1 |
| 1S***42 | Spring | 1 |
| 2M***80 | Seal--To Connector Pump Outlet | 2 |
120-4579 Valve Gp-Main Control
| 00***63 | Seal-O-Ring; (55.24mm Id) | 3 |
| 09***91 | Bolt; (Locking) (M12x1.75x25mm) | 2 |
| 10***83 | Spring; (Outer) | 2 |
160-7115 Valve Gp-Manifold
| 16***94 | Body | 1 |
| 16***15 | Valve Group-Manifold | 1 |
| 2M***80 | Seal--To Connector Pump Outlet | 2 |
152-6481 Valve Gp-Pilot
| 10***06 | Receptacle Kit; (Includes Wedge And Receptacle Assem.) | 1 |
| 13***62 | Plate Assem. | 1 |
| 15***81 | Valve Group-Pilot; -3-Function | 1 |
145-7771 Valve Gp-Pilot
| 03***39 | Ring-Retaining | 6 |
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
| 10***81 | Bolt-Socket Head; (M8x1.25x20-mm) | 3 |
153-0056 Valve Gp-Pilot
| 10***72 | Boot | 1 |
| 10***73 | Clamp-Boot | 1 |
| 10***28 | Valve Group-Pilot Cartridge; -Cartridge | 2 |
144-0115 Valve Gp-Pilot -Oil Manifold
| 11***68 | Valve Group-Sequence; -Float | 1 |
| 14***15 | Valve Group-Pilot; -Oil Manifold | 1 |
| 15***91 | Valve Group-Pressure Reducing; -Lowering Control | 1 |
107-3838 Valve Gp-Pilot Cartridge
| 10***37 | Plunger | 1 |
| 10***38 | Valve Group-Pilot Cartridge | 1 |
| 10***46 | Seat-Spring | 1 |
145-8711 Valve Gp-Pilot Cartridge
| 11***27 | Orifice | 1 |
| 13***04 | Adapter | 1 |
| 14***07 | Spring; (Inner) | 1 |
107-3828 Valve Gp-Pilot Cartridge
| 03***28 | Seal-O-Ring | 1 |
| 10***27 | Seat-Spring | 1 |
| 10***28 | Valve Group-Pilot Cartridge; -Cartridge | 1 |
145-8710 Valve Gp-Pilot Cartridge
| 13***01 | Spring; (Outer) | 1 |
| 13***04 | Adapter | 1 |
| 14***51 | Spring | 1 |
154-0191 Valve Gp-Pressure Reducing
| 15***91 | Valve Group-Pressure Reducing; -Lowering Control | 1 |
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
| 5P***99 | Ring-To Clutch Piston Pins | 1 |
154-8871 Valve Gp-Pressure Reducing
| 15***71 | Valve Group-Pressure Reducing; -Lowering Control | 1 |
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
| 5P***99 | Ring-To Clutch Piston Pins | 1 |
6e-2377 Valve Gp-Relief
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
| 4T***41 | Spring | 1 |
| 4T***71 | Plate | 1 |
4t-2742 Valve Gp-Relief
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
| 4T***41 | Spring | 1 |
| 4T***42 | Valve Group-Relief; -Secondary Steering | 1 |
6e-6185 Valve Gp-Relief
| 11***15 | Dowel | 1 |
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 1 |
| 4J***22 | Seal-Interface Between 3rd & Tilt Valve | 1 |
4t-2764 Valve Gp-Relief
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
| 4T***41 | Spring | 1 |
| 4T***64 | Valve Group-Relief; (Line, Tilt Cylinder Head End) | 1 |
4t-4162 Valve Gp-Relief
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
| 4T***41 | Spring | 1 |
| 4T***62 | Valve Group-Relief; (Line, Auxiliary Cyl Rod End) | 1 |
114-1268 Valve Gp-Sequence
| 11***68 | Valve Group-Sequence; -Float | 1 |
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
| 5P***99 | Ring-To Clutch Piston Pins | 1 |
162-7447 Valve Gp-Shutoff
| 12***54 | Plate; (6-mm Thk) | 1 |
| 12***56 | Plate; (4-mm Thk) | 1 |
| 14***44 | Spacer; (20x25x4-mm Thk) | 1 |
4t-1860 Valve Gp-Shuttle
| 1M***18 | Ball | 1 |
| 3J***07 | Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve | 1 |
| 4T***60 | Valve Group-Shuttle; -Ripper Lift-Ripper Tilt-Blade Tilt-Blade Lift | 1 |
6e-3373 Valve Gp-Shuttle
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
| 5P***99 | Ring-To Clutch Piston Pins | 1 |
| 6E***10 | Seal-O-Ring; (16.10mm Id) | 1 |
3e-8574 Valve Gp-Solenoid
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 1S***93 | Strap; (Cable) (0.62in Dia) | 2 |
| 2D***35 | Locknut (Visor To Bracket) | 1 |
Implements
143-4615 Arm As-Lift
| 10***71 | Block | 6 |
| 14***15 | Arm As-Lift | 1 |
| 3V***33 | Bearing-Sleeve; (89.2mm Id) | 2 |
147-5142 Logging Ar
| 11***54 | Counterweight Group | 1 |
| 12***24 | Counterweight Group | 1 |
| 14***95 | Film 950g; (On L.H. Side Of Radiator Guard) | 1 |
Machine Arrangement
170-8304 Conversion Ar-Machine -Custom
| 11***68 | Axle Ar-Fixed; -Front, Standard Differential | 1 |
| 11***88 | Cylinder & Seal Group-Tilt | 1 |
| 11***93 | Lines Group-Tilt Cylinder | 1 |
Power Train
138-3122 Axle Ar-Fixed
| 11***38 | Gear Group-Bevel & Pinion; -Fixed Axle | 1 |
| 11***69 | Housing Group-Fixed Axle | 1 |
| 13***92 | Differential Group | 1 |
164-3018 Brake & Planetary Gp
| 09***66 | Washer; (Hard) (4.5x9x1mm Thk) | 1 |
| 11***59 | Plug | 1 |
| 11***62 | Spring | 3 |
117-5756 Control Gp-Transmission Hyd
| 10***55 | Sensor Group-Temperature; -Front Brake Oil-Torque Converter Oil-Transmission Oil-Aftercooler-Axle Oil-Rear Brake Oil | 1 |
| 11***51 | Valve Group-Relief; -Transmission Hydraulic Control | 1 |
| 11***56 | Control Group-Transmission Hydraulic | 1 |
137-1392 Differential Gp
| 12***60 | Screw-Flat Head; (M6x1x16-mm) | 8 |
| 13***45 | Spider | 1 |
| 13***50 | Case Assem. | 1 |
112-0738 Gear Gp-Bevel & Pinion
| 03***60 | Cup-Roller Bearing | 1 |
| 03***61 | Cone-Roller Bearing | 1 |
| 11***38 | Gear Group-Bevel & Pinion; -Fixed Axle | 1 |
114-8947 Gear Gp-Output Transfer
| 10***12 | Drum | 1 |
| 11***53 | Tube Assem. | 1 |
| 11***57 | Case-Transfer Gear | 1 |
112-0769 Housing Gp-Fixed Axle
| 09***73 | Bolt; (Socket Head) (M12x1.75x60mm) | 4 |
| 11***69 | Housing Group-Fixed Axle | 1 |
| 12***03 | Seal-Lip Type; (7602mm Id) | 1 |
141-2387 Planetary Gp-Transmission
| 03***60 | Ring-Retaining | 3 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***50 | Piston-Clutch | 5 |
132-6120 Pump Gp-Transmission
| 11***53 | Pump Group-Transmission | 1 |
| 13***20 | Pump Group-Transmission | 1 |
| 8T***95 | Capscrew; (Hex Hd) (M10 X 1.50 X 30l Gr 10.9) | 1 |
117-1653 Pump Gp-Transmission
| 11***53 | Pump Group-Transmission | 1 |
| 11***54 | Manifold As | 1 |
| 12***60 | Body As-Oil Pump | 1 |
116-3827 Torque Converter & Housing Gp
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***21 | Flange-Pump Drive | 1 |
| 11***43 | Housing-Torque Converter | 1 |
116-3825 Torque Converter Gp
| 06***43 | Ring-Snap | 1 |
| 11***23 | Shaft-Output | 1 |
| 11***25 | Carrier Assem. | 1 |
141-2388 Transmission Ar
| 11***47 | Gear Group-Output Transfer | 1 |
| 11***27 | Torque Converter & Housing Group | 1 |
| 11***56 | Control Group-Transmission Hydraulic | 1 |
121-0357 Valve Gp-Modulating
| 11***82 | Seal-O-Ring; (16.36mm Id) | 1 |
| 11***54 | Spool Assem. | 1 |
| 11***83 | Seal-O-Ring | 1 |
159-0932 Valve Gp-Modulating
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 12***57 | Valve Group-Modulating; -Transmission Clutch | 1 |
| 12***74 | Spacer-Special; (16.5x34.42x11.5-mm Thk) | 1 |
115-4551 Valve Gp-Relief -Transmission Hydraulic Control
| 11***50 | Cover | 1 |
| 11***51 | Valve Group-Relief; -Transmission Hydraulic Control | 1 |
| 1M***51 | Spring-Steering Clutch | 1 |
950G serial number reference
The PIN/serial plate is riveted to the frame on the left-hand (curb) side of the machine, at or behind the front wheel/axle area; a duplicate stamp is usually punched into the frame itself nearby. On pre-2001 machines the serial is an 8-character code: a 3-letter prefix plus a 5-digit sequence (example 3JW00123). On the full 17-character PIN format used from 2001 on, that same prefix and sequence form the last 8 characters (example CAT0950GAAYD00231, prefix AYD, sequence 00231). The prefix identifies the model and production block; don't confuse it with a component or attachment serial plate elsewhere on the machine.
| Prefix | Identifies | Notes |
|---|---|---|
| 2JS | 950G (first series) | Early first-series 950G production block. Cat 3126 DITA engine. |
| 3JW | 950G (first series) | First-series 950G production block; base serial point for original parts and service manual coverage. Cat 3126 DITA engine. |
| 4BS | 950G (first series) | First-series 950G production block. Cat 3126 DITA engine. |
| 5FW | 950G (first series) | First-series 950G production block. Cat 3126 DITA engine. Confirm with dealer. |
| 5MW | 950G (first series) | First-series 950G production block, seen on later first-series units. Cat 3126 DITA engine. |
| 6NS | 950G (first series) | First-series 950G production block, 1998 model year. Cat 3126 DITA engine. |
| 8JW | 950G (first series) | First-series 950G production block. Cat 3126 DITA engine. Confirm with dealer. |
| AXR | 950G Series II | 950G Series II production block, Cat 3126B engine. |
| AXX | 950G Series II | 950G Series II production block, Cat 3126B engine. Common on Series II cooling and undercarriage parts listings. |
| AYB | 950G Series II | 950G Series II production block, Cat 3126B engine. |
| AYD | 950G Series II | 950G Series II production block, Cat 3126B engine; tied to the command-control steering option on parts listings. |
| AYL | 950G Series II | 950G Series II production block built for Sweden/EU-spec plate-and-decal configuration. |
| AYS | 950G Series II | 950G Series II production block, Cat 3126B engine. |
Frequently asked questions
What engine does the Caterpillar 950G wheel loader use?
The first-series 950G (about 1998-2001/2002) uses a Cat 3126 DITA turbocharged diesel rated at 134 kW (180 hp) gross / 147 kW (197 hp) net. The 950G Series II (about 2002-2005/2006) uses the Tier 2 Cat 3126B with air-to-air aftercooling, rated near 136 kW (183 hp) net.
What is the operating weight of the Caterpillar 950G?
Operating weight is approximately 17,782 kg (39,203 lb), varying with bucket type, counterweight, and tire configuration.
What replaced the Caterpillar 950G?
The Caterpillar 950G was replaced by the Cat 950H. It in turn succeeded the 950F/950F II, which used the Cat 3306 engine.
What 950G owners discuss
What's a common complaint about the 950G's transmission or torque converter behavior?
What wear patterns show up on tires, axles, and the articulation joint on this loader?
How do the engine quirks differ between the two 950G series?
What electrical or sensor faults come up most often on the 950G?
What hydraulic quirks should owners expect on a G-series loader?
What do owners and operators generally say about the 950G's reliability?
What should a buyer check on a used 950G before purchase?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 950G part?
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