Caterpillarwheel-type loaderwheel loader
Caterpillar 950
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 950 is a medium wheel loader that has spanned more than five decades of continuous production under the same model designation. The lineage begins with the original 950 introduced in 1965 — US and Canadian-built machines powered by the D330A diesel — and progressed through the 3304T-engined units produced through the late 1970s and early 1980s. Caterpillar subsequently released the 950B (1981–1989, Cat 3304T turbocharged, approximately 14,700 kg / 32,400 lb operating weight), the 950E (1988–1993, Cat 3304, approximately 15,570 kg / 34,300 lb), the 950F and 950F II (1993–1998, Cat 3116, approximately 15,710 kg / 34,680 lb, 127 kW / 170 hp net), the 950G (1998–2001), the 950H (2006–2011, Cat C7 ACERT Tier 3, 148 kW / 197 hp, approximately 18,500 kg / 40,785 lb), the 950K (2012–2015, Cat C7.1 ACERT Tier 4 Interim), the 950M (2014–2022, Cat C7.1 ACERT Tier 4 Final, approximately 18,100–20,100 kg / 39,900–44,300 lb), and the current 950 (2022–present, Cat C7.1, approximately 186 kW / 249 hp net, approximately 19,260 kg / 42,460 lb). Configurations available across generations have included standard Z-bar, optimized Z-bar with parallel-lift, and Integrated Toolcarrier (IT) variants, with the 950K consolidating those linkage families into a single optimized Z-bar platform that also replaced the IT62H tool carrier. Operating weight ranges vary by configuration and series.
Each successive generation brought measurable capability gains while preserving the 950's identity as a high-cycle, medium-class loader suited to aggregate handling, construction, and light-to-medium quarry work. The B-to-E transition added structural mass and output to keep pace with larger buckets; the F-series introduced the 3116 inline-six and the F II variant extended the product into higher-flow auxiliary hydraulics. The G and H generations moved to Cat's modular ACERT combustion management, raising power density and reducing particulate output ahead of Tier 3 mandates. The K and M series adopted the C7.1 with high-pressure common-rail injection to meet Tier 4 Final without sacrificing payload cycle times, and the 2022-onward 950 added joystick steering, Cat Payload with Assist, Autodig automation, and a lock-up torque converter as standard or optional equipment. In the used and parts market the 950 family — particularly H, K, and M series units — commands consistent demand because the C7 and C7.1 engines are widely supported by both OEM and aftermarket suppliers, the powershift transmission architecture is well understood by field technicians, and the machine's long production run means tooling, seal kits, and wear parts remain broadly available from multiple channels globally.
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 950 specifications
Engine
| Series note | The 'Caterpillar 950' name covers two distinct generations. The original-series 950 (production approx. mid-1960s–early 1980s, serial prefixes 90A/58H/81J/31K/43J/73J) used a Cat D330T or 3304T engine; the current-production 950 (2022–present) uses the Cat C7.1 ACERT. Specifications below are given per generation where they differ. |
| Engine model — original series | Cat 3304T (turbocharged, 4-cylinder inline diesel); earliest units (1965–1968) used the D330T or D330A |
| Engine model — current series (2022–present) | Cat C7.1 ACERT (turbocharged and aftercooled, 6-cylinder inline diesel) |
| Displacement — original series (3304T) | 7.0 L (427 cu in); bore 120.7 mm (4.75 in) × stroke 152.4 mm (6.00 in) |
| Displacement — current series (C7.1) | 7.01 L (427 cu in); bore 105 mm (4.13 in) × stroke 135 mm (5.31 in) |
| Gross power — current series (SAE J1995) | 188 kW (253 hp) at 2,100 rpm |
| Net power — current series (ISO 9249 / SAE J1349) | 172 kW (231 hp) at 2,100 rpm |
| Maximum power — current series (ISO 14396) | 186 kW (249 hp) at 2,100 rpm |
| Net power — original series (3304T) | approx. 97 kW (130 hp) |
| Maximum torque — current series | 1,231 N·m (908 lbf·ft) at 1,300 rpm |
| Emissions tier — current series | U.S. EPA Tier 4 Final, EU Stage V, Japan 2014 |
| Emissions tier — original series | Pre-tier (no emissions tier designation; pre-regulation era) |
Weights
| Operating weight — current series | 19,260 kg (42,461 lb) |
| Operating weight — original series (3304T) | approx. 12,928 kg (28,500 lb) |
| Static tipping load, full turn (with tire deflection) — current series | 11,201 kg (24,694 lb) |
| Static tipping load, straight (with deflection) — current series | 12,991 kg (28,640 lb) |
| Static tipping load — original series | approx. 9,730 kg (21,451 lb) |
Dimensions
| Transport length (without bucket) — current series | 7,024 mm (23.1 ft); varies by configuration — standard lift approx. 6,797 mm, high lift approx. 7,462 mm |
| Transport width (over tires) — current series | 2,824 mm (9.3 ft) |
| Height to ROPS — current series | 3,456 mm (11.3 ft) |
| Wheelbase — current series | 3,350 mm (11.0 ft) |
| Ground clearance — current series | 354 mm (1.2 ft) |
| Hinge pin height at maximum lift — current series (standard lift) | approx. 3,981–4,009 mm (13.1–13.2 ft); varies by configuration |
| Maximum dump height — current series (standard lift) | approx. 3,393 mm (11.1 ft) |
| Turning radius, outside of tires — current series | 6,440 mm (21.1 ft) |
| Overall length (with bucket lowered) — original series | approx. 6.17 m (20.3 ft) |
| Width over tires — original series | approx. 2.41 m (7.9 ft) |
| Height to cab top — original series | approx. 3.32 m (10.9 ft) |
Performance
| Maximum travel speed (forward) — current series | 39.5 km/h (24.5 mph) |
| Maximum travel speed (reverse) — current series | 25.7 km/h (16.0 mph) |
| Transmission — current series | Automatic countershaft powershift, 5 forward / 3 reverse, with lock-up clutch torque converter |
| Maximum travel speed (forward) — original series | approx. 35 km/h (22.4 mph); 4 forward gears |
| Maximum travel speed (reverse) — original series | approx. 42 km/h (26.5 mph); 4 reverse gears |
| Transmission — original series | Powershift, 4 forward / 4 reverse |
| Breakout force — current series | 181 kN (40,690 lbf) |
| Breakout force — original series | approx. 46 kN (10,320 lbf) |
| Bucket capacity (general purpose, heaped) — current series | 3.4 m³ (4.5 yd³) struck; range 2.7–4.4 m³ depending on application bucket |
| Bucket capacity — original series | approx. 1.6 m³ (2.1 yd³) heaped |
| Implement pump flow — current series | 322 L/min (85 gal/min) at 2,340 rpm |
Service capacities (summary)
| Fuel tank — current series | 259.5 L (68.6 gal) |
| Fuel tank — original series | approx. 201 L (53.1 gal) |
| Hydraulic system (tank) — current series | 97 L (25.6 gal) |
| Hydraulic system — original series | approx. 155 L (41 gal) |
| Engine oil — current series | 21 L (5.5 gal) |
| Cooling system — current series | 54 L (14.3 gal) |
| Transmission — current series | 43 L (approx. 11.4 gal); treat as indicative — single source |
| DEF/AdBlue tank — current series | 15 L (4.0 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
950 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase (with filter) — original 950 (3304T/D330A engine) | Approximately 19–21 L (5.0–5.5 US gal); varies by configuration/series. Later 950H (C7 ACERT): approx. 27–30 L (7.1–7.9 US gal). | Cat DEO (Diesel Engine Oil) SAE 15W-40 preferred for most ambient conditions (above −18 °C / 0 °F); Cat DEO SAE 10W-30 for moderate climates; Cat DEO-ULS SAE 15W-40 or 10W-30 for Tier-4 engines; Cat DEO Cold Weather SAE 0W-40 for sustained operation below −18 °C (0 °F). |
| Cooling System | Original 950 (early production): approximately 41–44 L (10.8–11.6 US gal); 950H (C7 ACERT) approx. 42 L (11.1 US gal); 950 GC approx. 48–50 L (12.7–13.2 US gal). Varies by configuration/series. | Cat ELC (Extended Life Coolant) premixed at 50% concentration, providing freeze protection to −34 °C (−29 °F). Cat ELC Extender added at service mid-life interval (approximately 3,000 hours); full drain and refill at 12,000 hours. |
| Fuel Tank | Original 950 (early production): approx. 201 L (53.1 US gal). 950H: approx. 264 L (69.8 US gal). 950 GC: 290 L (76.6 US gal). Varies by configuration/series. | Ultra-low-sulfur diesel (ULSD) meeting Cat fuel quality requirements; biodiesel blends up to B20 permitted where Cat approves. |
| Transmission (Powershift) | 950H: 34 L (9.0 US gal); 950 GC: 45 L (11.9 US gal). Original 950 early-production capacity not documented. Varies by configuration/series. | Cat TDTO (Transmission/Drive Train Oil) meeting Cat TO-4 specification; SAE 30 is the factory-fill grade for axle and transmission compartments in medium wheel loaders per Cat publications; Cat TDTO-TMS (Transmission Multi-Season) synthetic blend for cold-climate operation. |
| Front Differential and Final Drives (integrated axle housing) | 950H: approximately 34 L (9.0 US gal); 950 GC: 40 L (10.6 US gal). Original 950: not independently confirmed. Varies by configuration/series. | Cat TDTO meeting Cat TO-4 specification; SAE 30 preferred as factory-fill grade for medium wheel loader final drives and differentials. Cat TDTO Cold Weather formulation for operation below −25 °C (−13 °F). |
| Rear Differential and Final Drives (integrated axle housing) | 950H: approximately 34–36 L (9.0–9.5 US gal). 950 GC: 38 L (10.0 US gal). Varies by configuration/series. | Cat TDTO meeting Cat TO-4 specification; SAE 30 preferred as factory-fill grade for medium wheel loader axles. Cat TDTO Cold Weather for cold-climate operation. |
| Hydraulic System (total including tank, cylinders, and lines) | Original 950 (early production): approx. 155 L (41.0 US gal) per the Cat 950 lubrication guide. 950H: approx. 109–110 L (29 US gal) hydraulic tank. 950 GC: 112 L hydraulic tank (29.6 US gal). Hydraulic system total (including cylinders and lines) is larger than tank-only figure. Varies by configuration/series. | Cat HYDO Advanced 10 (SAE 10W viscosity) — the Cat-recommended hydraulic fluid for the 950-series wheel loaders; provides extended drain intervals (up to 6,000 hours with fluid analysis monitoring). Cat HYDO Advanced 30 for high-ambient or sustained high-temperature operation. Minimum 900 ppm zinc content required; do not mix oil types. |
| Grease — all pins, joints, articulation bearing, linkage (specification only; no volumetric fill) | No fixed refill capacity; applied by grease gun to all lube points. Cat OMM specifies daily or 8–10 hour intervals for heavily loaded pin joints; every 50 hours for hydraulic cylinder pivot points and articulation joints. | Cat Multipurpose Grease (MPG) NLGI No. 2 for standard pin joints and bearings; Cat Prime Application Grease NLGI No. 2 with greater than 3% molybdenum for high-load oscillating pin joints; Cat Extreme Application Grease No. 2 (EAG-2) for extreme-pressure oscillating joints; Cat Arctic Platinum Grease for sustained operation below −25 °C (−13 °F). |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 950 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
Servicing the 950 beyond the schedule
Predictive Maintenance and Fluid Analysis for the Cat 950
The 950's Cat C7.1 powertrain and HYDO Advanced hydraulic circuit are well-suited to Cat S-O-S fluid analysis sampling. Pull engine oil, transmission oil, hydraulic fluid, and front and rear axle oil at every 250-hour interval and submit samples before the next service window. Watch iron and silicon trends in the axle samples — the 950's planetary final drives are a known early-wear indicator. Elevated copper in the transmission sample signals torque-converter thrust washer wear before a catastrophic failure develops. Use S-O-S results to justify extending or tightening Cat TDTO and HYDO Advanced change intervals.
Corrective Repairs and Common Failure Points on the 950
The 950 powershift transmission is the most frequently cited corrective repair target: low modulating pressure at the top of the filter housing (target approximately 2,760 kPa / 400 psi through all speeds in both directions) points to a worn pump, sticking modulating relief valve, or degraded clutch discs. Torque-converter aluminum in the sump filter is a red-flag finding requiring immediate converter teardown. On older 3304T-engined units, head-gasket and sleeve-seal failures at high hours are common; on C7.1 machines, clogged diesel particulate filter outlets and failing DEF dosing valves are the predominant corrective items.
Overhaul and Rebuild Decision Points for the Cat 950
Major powertrain rebuild thresholds for the 950 align with fluid analysis wear-metal trends rather than a fixed hour clock, but practical field experience places first-overhaul decisions around 10,000–14,000 hours for well-maintained C7/C7.1 units and as low as 6,000–8,000 hours for older 3304T machines in abrasive environments. Cat certified rebuild programs for 950K and 950M units recondition the engine, torque converter, transmission, and both final drives together with a 3-year/5,000-hour powertrain warranty. Hydraulic cylinder rod chrome condition and articulation hitch bearing play are the key structural indicators that trigger frame-level overhaul decisions independently of engine hours.
Seasonal and Environmental Servicing for the 950
In cold climates, verify Cat ELC freeze protection to at least −34 °C (−29 °F) before the season; install the optional jacket water heater and confirm hydraulic oil viscosity is adequate — Cat HYDO Advanced 10 is the cold-weather hydraulic choice, while HYDO Advanced 30 suits sustained high-ambient operation. In dusty or quarry environments, shorten the air cleaner primary element inspection to every 10 service hours and pre-clean radiator and oil-cooler fins daily. In corrosive coastal or salt-road environments, increase articulation pin and Z-bar greasing frequency to every 25 hours to prevent accelerated pin-bore wear.
950 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 5S-9665 | Fuel Filter | Fuel system service | Check fitment → |
| 2P-7714 | Fuel Filter | Fuel system service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
950 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| MID 082 CID 0352 FMI 13 | Position Sensor (Lift Lever) — lever not centred on power-up; implement lift function locked out until key cycle (950G/950H/950K/950 GC generations using CDL code format) | Worn or sticking joystick return spring or plastic detent mechanism preventing the lever from returning to the neutral position before the ECM reads its start-up state; less commonly a failed sensor or damaged harness pin | Key the machine off and allow the lever to self-centre; if code recurs, inspect lever return mechanism for wear, then use Cat ET to check live duty-cycle — should read 50 ±9 % at rest; re-calibrate sensor in ET if hardware is sound, otherwise replace the lever assembly |
| MID 082 CID 0353 FMI 03 | Position Sensor (Tilt/Bucket Lever) — voltage above normal; bucket tilt command circuit fault (950G/950H/950K generation CDL format) | Open circuit or short-to-supply on the tilt lever sensor signal wire; connector corrosion at the lever harness plug; less commonly a failed sensor | Inspect the tilt lever wiring harness connector for bent pins, corrosion or chafing damage; measure sensor supply and signal voltages against service manual specification; replace sensor or repair harness as indicated |
| MID 082 CID 0358 FMI 05 | Solenoid Valve (Pilot Pressure Supply) — current below normal or open circuit; implement functions disabled (950G/950H/950K CDL format) | Open circuit in the solenoid driver wire between the implement ECM and the pilot supply solenoid; failed solenoid coil (nominal resistance approximately 32 Ω); corroded or backed-out connector pin | Check solenoid coil resistance at the connector with a multimeter; inspect harness for pinching or chafing at articulation joint; verify ECM output voltage at the solenoid terminal before condemning the solenoid |
| MID 036 CID 0100 FMI 03 | Engine Oil Pressure Sensor — voltage above normal (open circuit or short to supply); ECM cannot perform accurate engine protection (950G with 3126 engine; 950G Series II with 3126B engine; 950H with C7 ACERT engine — CDL format) | Open sensor signal circuit or sensor signal wire shorted to battery voltage; water ingress or corrosion at the sensor connector; failed sensor element | With key-on engine-off, check ECM-side signal voltage at the sensor connector — voltage above approximately 4.8 V confirms open or short-high fault; inspect connector for corrosion, repair or replace harness as needed; replace sensor if wiring checks pass |
| E360 (severity 1/2/3) | Low Engine Oil Pressure — event code generated when oil pressure drops below the programmed trip point; severity 1 is a warning with no power derate, severity 2 causes power derate, severity 3 causes engine shutdown (950G through current C7.1 generations) | Low engine oil level; worn oil pump; blocked oil filter; oil pressure sensor fault masking real pressure; severe internal wear | Stop work immediately at severity 2 or 3; check oil level on level ground with engine off; if level is correct, do not restart — diagnose oil pump and pressure-relief system before running; at severity 1 monitor closely and investigate within the same shift |
| E361 (severity 1/2/3) | High Engine Coolant Temperature — event code generated when ECM detects coolant temperature above trip point; severity 1 is a warning, severity 2 causes power derate, severity 3 may cause engine shutdown or further derate depending on application configuration (950G through current C7.1 generations) | Blocked radiator fins (debris or dust); low coolant level; failed thermostat stuck closed; failing water pump; air in cooling system after recent service | Stop the machine and allow it to idle briefly at severity 1 while checking for debris blockage; shut down at severity 2 or 3; inspect radiator for external plugging, coolant level and integrity; do not remove radiator cap while hot |
| E362 (severity 1/3) | Engine Overspeed — generated when ECM detects engine speed exceeding the programmed overspeed trip point; severity 1 is a warning with no performance effect, severity 3 causes engine shutdown (950G through current, CDL and J1939 systems); no severity 2 derate level exists for this event code on C7/C9 engine platforms | Operator downhill runaway with inadequate retarding; failed throttle or governor mechanism; incorrect ECM parameter setting; defective engine speed sensor causing false reading | Reduce vehicle speed or throttle immediately; check event log in Cat ET for frequency and context; verify engine speed sensor air gap and tone-ring condition; if recurring without true overspeed, inspect sensor and harness |
| 5856-9 | Lost communication with ECM #2 (CAN data link fault) — SPN 5856, FMI 9 = abnormal update rate on J1939 network; displayed on 950 GC and similar C7.1-equipped models | Damaged or corroded CAN bus wiring between main ECM and secondary ECM (powertrain or body controller); failed ECM module; software version mismatch between modules after ECM replacement | Inspect CAN data link harness connectors for corrosion, damage or improper routing; perform CAN Data Link Test procedure in Cat ET; verify software versions on all ECMs match; if machine is emission-locked, only a registered Cat dealer with current software can clear the condition |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
950 attachments & work tools
General-Purpose (GP) Bucket — Performance Series
The primary digging bucket for the 950 class is the Cat Performance Series GP bucket, available in capacities roughly 2.7–3.5 m³ (3.5–4.6 yd³) for standard earthwork. Bucket shape is engineered against the machine's Z-bar linkage geometry to maximise fill factor and breakout force at ground level. Both pin-on and Fusion quick-coupler interface versions are offered.
Material-Handling (MH) Bucket
A shallower, smoother-floor material-handling bucket is offered for the 950 class, suited to loose, low-density stockpile work and truck loading. Bolt-on flat cutting-edge GET replaces teeth on this bucket family to protect the floor and reduce material scatter.
Rock / Heavy-Duty Bucket
A reinforced rock-duty bucket with heavier plate and extra wear packages is offered for high-density or abrasive materials such as crushed stone, ore, and shot rock. Capacity is reduced relative to the GP bucket to stay within rated payload. Available with either Fusion or pin-on mounting.
Light-Material / High-Dump (Woodchip / Coal) Bucket
Elevated-capacity, high-dump buckets extend the 950's capacity range up to approximately 9.9 m³ (13 yd³) for low-density materials such as woodchips, coal, grain, and mulch. Forestry-configured 950 units are noted to have increased tilt capacity to better handle chip and log material.
Multi-Purpose / 4-in-1 Bucket
A multi-purpose clamshell-style bucket providing digging, dozing, grading, and clamping functions is listed in the 950K work-tool line. This attachment requires the machine's auxiliary third hydraulic function (third valve) to operate the clam action. Available in both pin-on and Fusion coupler interfaces.
Side-Dump Bucket
A side-dump specialty bucket is listed in Cat's work-tool catalog for the 950K class, enabling material discharge to either side of the machine — useful in confined trenching or tunnel applications. This tool requires the third auxiliary hydraulic valve circuit to actuate the tilt mechanism.
Waste / Industrial Bucket (Top Clamp, Tamp and Load-and-Carry)
Cat offers waste-specific bucket variants for the 950 class including load-and-carry, tamp-and-clamp, and dozing styles designed for transfer stations, recycling depots, and scrap yards. These buckets pair with the Industrial and Waste factory configuration, which adds guarding reinforcement to the machine's powertrain, cab, and linkage.
Pallet Forks
Cat Fusion-interface pallet forks in an open-frame design with offset tines are a primary non-bucket work tool for the 950 class, suited to palletised construction materials and pipe handling on site. The open frame maximises sightlines to tine tips at both ground level and truck-bed height.
Forestry Forks (Log-and-Lumber, Logging, Millyard, Grapple, Pole Forks)
Multiple forestry-specific fork families — log-and-lumber, logging, millyard, pole and pipe/pole styles — are catalogued for the 950K class and compatible with the forestry factory configuration. The Forestry configuration of the 950 raises tilt and lift capacities to suit mill-yard chip and log handling.
Coupler / Mounting Systems — Fusion Quick Coupler
Cat's Fusion Coupler for the 950/962 class (weighing approximately 257 kg / 566 lb) uses a constant-pressure hydraulic wedging system that maintains rated payload and sightlines comparable to a pin-on tool. A common interface spans machines from the 924 through the 972 class, enabling fleet-wide tool sharing.
Coupler / Mounting Systems — Pin-On Interface
All bucket and fork families in the 950 class are available as direct pin-on tools where no quick-coupler is installed; this remains the baseline configuration on machines not ordered with the Fusion option. Pin-on tools avoid coupler weight and offset entirely and are typically specified in high-cycle truck-loading applications.
Hydraulic Arrangements — Standard and Performance Packages
On the 950M, Cat offered three factory hydraulic performance packages: standard flow (H1), standard flow with electronic self-level and work-tool positioner (H2), and high-flow hydraulics with all H2 features (H3). The current 950 retains optional third and fourth auxiliary hydraulic circuits enabling tools such as multi-purpose buckets, side-dump buckets, and grapples.
Ground Engaging Tools (GET) — Advansys and Legacy Systems
Cat's Advansys hammerless GET system is catalogued for wheel loaders from the 950 through the 992 class, providing tapered tip profiles for reduced drag and adapter noses rated for significantly lower stress than the preceding system; no special removal tools are required. Legacy bolt-on GET (cutting edges, end bits, sidebar protectors, base-edge segments) remain interchangeable on the 950-class bucket lineup.
Factory Special Configurations
Cat lists multiple application-specific factory configurations for the 950: Industrial/Waste (reinforced guarding for scrap yards, recycling, and demolition); Forestry (higher tilt and lift capacities for mill-yard work); Block Handler (structural reinforcement for block quarries); Steel Mill (additional safety features for slag environments); Tunneling (added performance and structural protection for underground work); and Corrosion Resistant (factory-applied treatment for chemical facilities, salt-water ports, and agriculture). Availability varies by region and series generation.
Operator-Assist and Productivity Technology (Current 950, 2022-onwards)
The current-generation 950 added Autodig — automating bucket filling to improve fill factors and cycle times — and Auto Set Tires to promote correct loading technique and cut tyre slip. Cat Payload with Assist displays real-time load data; an Advanced Payload subscription option adds Tip-Off Assist to auto-trim the final bucket to a target load. Product Link telematics and optional VisionLink fleet management are available.
All 950 assemblies by section
Every catalogued assembly group for the Caterpillar 950. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Central Structure
5s6425 Balancer Group
| 5S***25 | Balancer Group; Balancer Group | 1 |
2p6201 Camshaft Group
| 2P***01 | Camshaft Group-Single; Single Camshaft Group | 1 |
5s6429 Connecting Rod And Piston Group
| 5S***29 | Connecting Rod And Piston; Connecting Rod And Piston Group | 1 |
Cylinder Block Cover (6a6610 N/S)
| 6A***10 | Cover Group-Cylinder Block; Cylinder Block Cover Group | 1 |
6a6610 Cylinder Block Cover Group
| 6A***10 | Cover Group-Cylinder Block; Cylinder Block Cover Group | 1 |
2p1686 Crankshaft Assembly--Field Installation
| 2P***86 | Crankshaft Assembly | 1 |
Crankshaft Bearing Replacement Groups
Crankshaft (2p6216 N/S)
| 2P***16 | Crankshaft Group | 1 |
6a6669 Cylinder Block Assembly
| 6A***69 | Cylinder Block As | 1 |
Cylinder Block Cover (6a6609 N/S)
| 6A***09 | Cylinder Block Cover | 1 |
6a6609 Cylinder Block Cover Group
| 6A***09 | Cylinder Block Cover | 1 |
6a3834 Cylinder Block Group
| 6A***34 | Cylinder Block Group; Cylinder Block Group | 1 |
4n4028 Connecting Rod And Piston Group
| 4N***28 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
9s8912 Connecting Rod And Piston Group
| 9S***12 | Piston & Rod Group; Connecting Rod And Piston Group | 1 |
2p6225 Crankshaft Seal Group
| 2P***25 | Seal Group-Crankshaft; Crankshaft Seal Group | 1 |
2p6223 Crankshaft Seal Group
| 2P***23 | Seal Group-Crankshaft; Crankshaft Seal Group | 1 |
Cooling System
2p6215 Engine Oil Cooler Group
| 2P***15 | Cooler Group-Engine Oil; Oil Cooler Group Engine | 1 |
2p6508 Transmission Oil Cooler Group
| 2P***08 | Cooler Group-Transmission Oil; Transmission Oil Cooler Group | 1 |
2p8165 Housing And Regulator Group
| 2P***65 | Housing & Regulator Group; Housing And Regulator Group | 1 |
3n3271 Housing And Regulator Group
| 3N***71 | Housing & Regulator Group; Housing And Regulator Group | 1 |
2p8167 Housing And Regulator Group
| 2P***67 | Housing & Regulator Group; Regulator And Housing Group | 1 |
2p8164 Housing And Regulator Group
| 2P***64 | Housing & Regulator Group; Regulator And Housing Group | 1 |
2p8169 Housing And Regulator Group
| 2P***69 | Housing & Regulator Group; Housing And Regulator Group | 1 |
2p8163 Housing And Regulator Group
| 2P***63 | Housing & Regulator Group; Housing And Regulator Group | 1 |
2p7741 Water Pipe Lines Group
| 2P***41 | Lines Group-Water; Water Lines Group-- Pipe | 1 |
2p6188 Water Lines
| 2P***88 | Lines Group-Water; Water Lines Group | 1 |
2p7740 Water Elbow Lines Group
| 2P***40 | Lines Group-Water; Water Lines Group--Elbow | 1 |
2p661 Water Pump
| 2P***61 | Pump Group-Water; Water Pump Group | 1 |
2p662 Water Pump
| 2P***62 | Pump Group-Water; Water Pump Group | 1 |
Engine Arrangement
5c790 Basic Engine Arrangement
| 2P***49 | Pipe Group-Exhaust; Exhaust Pipe Group | 0 |
| 2P***05 | Pulley Group; Pulley Group | 0 |
| 4N***79 | Exhaust Pipe Group | 1 |
5c785 Basic Engine Arrangement
| 2P***49 | Pipe Group-Exhaust; Exhaust Pipe Group | 0 |
| 2P***05 | Pulley Group; Pulley Group | 0 |
| 4N***79 | Exhaust Pipe Group | 0 |
Engine Arrangements
Front Structure
4n6508 Front Housing Cover Group
| 4N***08 | Cover Group-Front Housing; Front Housing Cover Group | 1 |
2p6529 Front Housing Cover Group
| 2P***29 | Cover Group-Front Housing; Front Housing Cover Group | 1 |
2p6528 Front Housing Cover Group
| 2P***28 | Cover Group-Front Housing; Front Housing Cover Group | 1 |
2p7831 Fan Drive Group
| 2P***31 | Drive Group-Fan; Fan Drive Group | 1 |
Fan Drive (4n8537 N/S)
| 4N***37 | Drive Group-Fan; Fan Drive Group | 1 |
Fan Drive (6a7389 N/S)
| 6A***89 | Fan Drive Group | 1 |
6a7389 Fan Drive Group
| 6A***89 | Fan Drive Group | 1 |
2p6498 Front Housing Fasteners Group
| 2P***98 | Fastener Group-Front Housing; Front Housing Fastener Group | 1 |
2p6498 Front Housing Fastener Group
| 2P***98 | Fastener Group-Front Housing; Front Housing Fastener Group | 1 |
2p6211 Front Gear Group--Timing
| 2P***11 | Front Gear Group; Front Gear Group-Timing | 1 |
2p6153 Front Housing Group
| 2P***53 | Front Housing; Front Housing Group | 1 |
2p9642 Front Gear Group--Timing
| 2P***42 | Gear Group-Front Timing | 1 |
2p9642 Front Timing Gear Group
| 2P***42 | Gear Group-Front Timing | 1 |
2p9641 Front Housing Group
| 2P***41 | Housing Group-Front; Front Housing Group | 1 |
2p8598 Crankshaft Hub Group
6a6620 Pulley Group
| 6A***20 | Pulley Group | 1 |
5c1987 Pulley Group
| 5C***87 | Pulley Group | 1 |
6a6621 Pulley Group
| 6A***21 | Pulley Group | 1 |
Pulley (6a5562 N/S)
| 6A***62 | Pulley Group | 1 |
Pulley (2p8605 N/S)
| 2P***05 | Pulley Group; Pulley Group | 1 |
6a4274 Pulley Group
| 6A***74 | Pulley Group | 1 |
Pulley (2p8610 N/S)
| 2P***10 | Pulley Group | 1 |
4n8281 Pulley Group--Type 2
| 4N***81 | Pulley Group; Pulley Group | 1 |
4n8281 Pulley Group--Type 1
| 4N***81 | Pulley Group; Pulley Group | 1 |
Pulley (4n3562 N/S)
| 4N***62 | Pulley Group-Crankshaft; Crankshaft Pulley Group | 1 |
2p7757 Support Group
| 2P***57 | Support Group | 1 |
5c2678 Support Group
| 5C***78 | Support Group | 1 |
4n5239 Support Group
| 4N***39 | Support Group-Engine; Engine Support Group | 1 |
2p7753 Support Group
| 2P***53 | Support Group-Engine; Front Engine Support Group | 1 |
2p7755 Support Group
| 2P***55 | Support Group-Engine | 1 |
2p6246 Trunnion Group
| 2P***46 | Trunnion Group-Engine | 1 |
Fuel System And Governor
9n867 Fuel Ratio Control Group
| 9N***67 | Control Group-Fuel Ratio | 1 |
6n2505 Torque Control Group
| 6N***05 | Control Group-Torque | 1 |
4n4510 Governor Cover Group
| 4N***10 | Cover Group-Governor; Governor Cover Group | 1 |
6n4413 Tachometer Drive Group
| 6N***13 | Drive Group-Tachometer; Tachometer Drive Group | 1 |
4n3303 Fuel Filter Group
| 4N***03 | Filter Group-Fuel; Fuel Filter Group | 1 |
2p975 Fuel Filter Group
| 2P***75 | Filter Group-Fuel; Fuel Filter Group | 1 |
Primary Fuel Filter (1p6835 N/S)
| 1P***35 | Filter Group-Primary Fuel; Primary Fuel Filter Group | 1 |
5s9665 Fuel Filter Group
| 5S***65 | Fuel Filter | 1 |
Fuel Filter (2p7714 N/S)
| 2P***14 | Fuel Filter | 1 |
Fuel Filter (5s9666 N/S)
| 5S***66 | Fuel Filter Group | 1 |
6n5916 Fuel Filter Group
| 6N***16 | Fuel Filter Group | 1 |
Fuel Injection Lines (2p7461 N/S)
| 2P***61 | Fuel Injection Lines; Fuel Injection Lines Group | 1 |
Fuel Injection Lines (2p7460 N/S)
| 2P***60 | Fuel Injection Lines | 1 |
4n3374 Fuel Injection Lines Group
| 4N***74 | Fuel Injection Lines Group | 1 |
6n728 Fuel Injection Lines Group
| 6N***28 | Fuel Injection Lines Group | 1 |
Fuel Injection Lines (6n727 N/S)
| 6N***27 | Fuel Injection Lines Group | 1 |
3n3387 Fuel Injection Pump Group
| 3N***87 | Fuel Injection Pump Group | 1 |
4n4882 Fuel Injection Lines Group--Part 2
| 4N***82 | Fuel Injection Valves And Lines Group | 1 |
4n4882 Fuel Injection Lines Group--Part 2 Of 2
| 4N***82 | Fuel Injection Valves And Lines Group | 1 |
4n4882 Fuel Injection Lines Group--Part 1 Of 2
| 4N***82 | Fuel Injection Valves And Lines Group | 1 |
5s2100 Fuel Priming Pump Group
| 5S***00 | Fuel Priming Pump | 1 |
Fuel Priming Pump (7s1251 N/S)
| 7S***51 | Fuel Priming Pump Group | 1 |
Fuel Priming Pump (2p7716 N/S)
| 2P***16 | Fuel Priming Pump Group | 1 |
Governor And Fuel Injection Pump (8s727 N/S)
| 8S***27 | Fuel Pump Housing And Governor | 1 |
Governor And Fuel Injection Pump (7s5859 N/S)
| 7S***59 | Fuel Pump Housing And Governor | 1 |
Governor And Fuel Injection Pump (8s720 N/S)
| 8S***20 | Fuel Pump Housing And Governor; Governor And Fuel Injection Pump | 1 |
Governor And Fuel Injection Pump (8s728 N/S)
| 8S***28 | Fuel Pump Housing And Governor | 1 |
Governor And Fuel Injection Pump (7s9334 N/S)
| 7S***34 | Fuel Pump Housing And Governor | 1 |
7s8831 Fuel Pump Housing Group
| 7S***31 | Fuel Pump Housing Group | 1 |
4n4900 Fuel Ratio Control Group
| 4N***00 | Fuel Ratio Control Group | 1 |
7s5445 Fuel Transfer Pump Group (7s5108 N/S)
| 7S***45 | Fuel Transfer Pump Group | 1 |
7s4430 Fuel Transfer Pump Group
| 7S***30 | Fuel Transfer Pump Group | 1 |
4n4873 Fuel Transfer Pump Group (7s5108 N/S)
| 4N***73 | Fuel Transfer Pump Group | 1 |
Glow Plug (5s8500 N/S)
| 5S***00 | Glow Plug Group; Glow Plug Group | 1 |
6n243 Governor And Fuel Injection Pump Group
| 6N***43 | Gov & Fuel Inj Pump Group | 1 |
6n279 Governor And Fuel Injection Pump Group
| 6N***79 | Gov & Fuel Inj Pump Group | 1 |
4n1834 Governor And Fuel Injection Pump Group--Part 4 Of 4
| 4N***34 | Gov & Fuel Inj Pump Group | 1 |
6n277 Governor And Fuel Injection Pump Group
| 6N***77 | Gov & Fuel Inj Pump Group; Governor And Fuel Injection Pump Group | 1 |
6n281 Governor And Fuel Injection Pump Group
| 6N***81 | Gov & Fuel Inj Pump Group; Governor And Fuel Injection Pump Group | 1 |
4n1834 Governor And Fuel Injection Pump Group--Part 2 Of 4
| 4N***34 | Gov & Fuel Inj Pump Group | 1 |
4n1834 Governor And Fuel Injection Pump Group--Part 1 Of 4
| 4N***34 | Gov & Fuel Inj Pump Group | 1 |
4n1834 Governor And Fuel Injection Pump Group--Part 3 Of 4
| 4N***34 | Gov & Fuel Inj Pump Group | 1 |
6n5356 Governor And Fuel Injection Pump Group--Part 2 Of 4
| 6N***56 | Gov & Fuel Inj Pump Group | 1 |
6n247 Governor And Fuel Injection Pump Group--Type 2
| 6N***47 | Gov & Fuel Inj Pump Group | 1 |
6n5356 Governor And Fuel Injection Pump Group--Part 3 Of 4
| 6N***56 | Gov & Fuel Inj Pump Group | 1 |
6n247 Governor And Fuel Injection Pump Group--Type 1
| 6N***47 | Gov & Fuel Inj Pump Group | 1 |
4n6115 Governor And Fuel Injection Pump Group
| 4N***15 | Gov & Fuel Inj Pump Group; Governor And Fuel Injection Pump Group | 1 |
6n284 Governor And Fuel Injection Pump Group--Replaced By 6n2476 Shown
| 6N***84 | Gov & Fuel Inj Pump Group | 1 |
6n5356 Governor And Fuel Injection Pump Group--Part 1 Of 4
| 6N***56 | Gov & Fuel Inj Pump Group | 1 |
4n6116 Governor And Fuel Injection Pump Group--Field Installation
| 1P***36 | Gasket; (Fuel Priming Pump)(Fuel Priming Pump) | 1 |
| 1P***53 | Stop Bar .250" (6.35 mm) Thick | 1 |
| 2H***34 | Seal Transfer Pump To Plate | 1 |
6n5356 Governor And Fuel Injection Pump Group--Part 4 Of 4
| 6N***56 | Gov & Fuel Inj Pump Group | 1 |
6n2476 Governor And Fuel Injection Pump Group--Replaced By 4n6116
| 1P***36 | Gasket; (Fuel Priming Pump)(Fuel Priming Pump) | 1 |
| 1P***53 | Stop Bar .250" (6.35 mm) Thick | 1 |
| 2H***34 | Seal Transfer Pump To Plate | 1 |
6n283 Governor And Fuel Injection Pump Group
| 6N***83 | Governor And Fuel Injection Pump Group | 1 |
6n244 Governor And Fuel Injection Pump Group--Type 2
| 6N***44 | Governor And Fuel Injection Pump Group | 1 |
6n275 Governor And Fuel Injection Pump Group--Replaced By 6n2476 Listed
| 6N***75 | Governor And Fuel Injection Pump Group | 1 |
6n274 Governor And Fuel Injection Pump Group--Replaced By 6n2476 Shown
| 6N***74 | Governor And Fuel Injection Pump Group | 1 |
6n282 Governor And Fuel Injection Pump Group--Replaced By 6n2476 Shown
| 6N***82 | Governor And Fuel Injection Pump Group | 1 |
Governor And Fuel Injection Pump Group (6n249 N/S)
| 6N***49 | Governor And Fuel Injection Pump Group | 1 |
6n244 Governor And Fuel Injection Pump Group--Type 1
| 6N***44 | Governor And Fuel Injection Pump Group | 1 |
6n286 Governor And Fuel Injection Pump Group
| 6N***86 | Governor And Fuel Injection Pump Group | 1 |
6n2477 Governor And Fuel Injection Pump Group
| 6N***77 | Governor And Fuel Injection Pump Group | 1 |
6n282 Governor And Fuel Injection Pump Group
| 6N***82 | Governor And Fuel Injection Pump Group | 1 |
7s9333 Governor Group--Part 2 Of 2--Type 3
| 7S***33 | Governor Group | 1 |
7s9332 Governor Group--Part 2 Of 2--Type 1
| 7S***32 | Governor Group | 1 |
7s9332 Governor Group--Part 2 Of 2--Type 2
| 7S***32 | Governor Group | 1 |
7s9333 Governor Group--Type 1
| 7S***33 | Governor Group | 1 |
7s9332 Governor Group--Part 1 Of 2--Type 1
| 7S***32 | Governor Group | 1 |
7s9333 Governor Group--Part 1 Of 2--Type 3
| 7S***33 | Governor Group | 1 |
7s9332 Governor Group--Part 1 Of 2--Type 2
| 7S***32 | Governor Group | 1 |
7s9333 Governor Group--Type 2
| 7S***33 | Governor Group | 1 |
Torque Control (8s6099 N/S)
| 8S***99 | Governor Torque Spring | 1 |
Torque Control (8s5549 N/S)
| 8S***49 | Governor Torque Spring | 1 |
Governor And Fuel Injection Pump (7s5858 N/S)
| 7S***58 | Injection Pump & Gov Group; Governor And Fuel Injection Pump Group | 1 |
9h2256 Fuel Priming Pump Assembly
| 9H***56 | Pump Assembly | 1 |
4n3287 Fuel Priming Pump Group
| 4N***87 | Pump Group-Fuel Priming; Pump Group-Fuel Priming | 1 |
Fuel Priming Pump (4n4314 N/S)
| 4N***14 | Pump Group-Fuel Priming; Fuel Priming Pump Group | 1 |
4n4864 Fuel Transfer Pump Group--Type 2
| 4N***64 | Pump Group-Fuel Transfer | 1 |
4n4864 Fuel Transfer Pump Group--Type 1
| 4N***64 | Pump Group-Fuel Transfer | 1 |
7s4429 Fuel Transfer Pump Group
| 7S***29 | Pump Group-Fuel Transfer; Fuel Transfer Pump Group | 1 |
Torque Control (9s3312 N/S)
| 9S***12 | Rack Stop Group | 1 |
Service Meter (9s5141 N/S)
| 9S***41 | Service Meter | 1 |
Service Meter (9s8923 N/S)
| 9S***23 | Service Meter | 1 |
Service Meter (9s7993 N/S)
| 9S***93 | Service Meter | 1 |
Service Meter Drive (2p6158 N/S)
| 2P***58 | Service Meter Drive | 1 |
Service Meter (2p6478 N/S)
| 2P***78 | Service Meter Group | 1 |
Torque Control (6n509 N/S)
| 6N***09 | Torque Control Group | 1 |
6n581 Torque Control Group
| 6N***81 | Torque Control Group | 1 |
Torque Control (9s3423 N/S)
| 9S***23 | Torque Spring Group | 1 |
Gasket Kits
Gasket Kits
| 5P***68 | Kit-Gasket; (Single Cylinder Liner)(Single Cylinder Liner) | 0 |
| 5P***71 | Water Pump- Serial No. 78p34523 To 78p40899 Inclusive | 0 |
| 5P***02 | 8n***60, 8n***61, 8n***15, 8n***16; 1w***78, 1w***79, 1w***86, 1w***87 | 0 |
Intake And Exhaust System
Accessory Drive (2p7705 N/S)
| 2P***05 | Accessory Drive | 1 |
Accessory Drive (2p7712 N/S)
| 2P***12 | Accessory Drive | 1 |
2p7794 Air Compressor Group
| 2P***94 | Air Compressor Group | 1 |
Air Compressor (2p8712 N/S)
| 2P***12 | Air Compressor Group; Air Compressor Group | 1 |
Air Compressor (2p8710 N/S)
| 2P***10 | Air Compressor Group; Air Compressor Group | 1 |
Air Compressor (2p7795 N/S)
| 2P***95 | Air Compressor Group; Air Compressor Group | 1 |
2p8711 Air Compressor Group
| 2P***11 | Air Compressor Group | 1 |
2p8709 Air Compressor Group
| 2P***09 | Air Compressor Group | 1 |
2p6837 Air Lines Group
| 2P***37 | Air Lines Group | 1 |
4n8279 Exhaust Pipe Group
| 4N***79 | Exhaust Pipe Group | 1 |
2p6533 Exhaust Manifold Fastener Group
| 2P***33 | Fastener Group-Exhaust Manifold; Exhaust Manifold Fastener Group | 1 |
4n9585 Exhaust Manifold Fastener Group
| 4N***85 | Fastener Group-Exhaust Manifold; Exhaust Manifold Fastener Group | 1 |
4n9584 Exhaust Manifold Fastener Group
| 4N***84 | Fastener Group-Exhaust Manifold; Exhaust Manifold Fastener Group | 1 |
6a7457 Air Lines Group
| 6A***57 | Lines Group-Air; Air Lines Group | 1 |
Air Lines (6a7457 N/S)
| 6A***57 | Lines Group-Air; Air Lines Group | 1 |
4n4794 Air Lines Group
| 4N***94 | Lines Group-Air; Air Lines Group | 1 |
Air Lines (2p6839 N/S)
| 2P***39 | Lines Group-Air; Air Lines Group | 1 |
Air Lines (2p6843 N/S)
| 2P***43 | Lines Group-Air; Air Lines Group | 1 |
2p6840 Air Lines Group
| 2P***40 | Lines Group-Air; Air Lines Group | 1 |
2p7796 Air Compressor Lines Group
| 2P***96 | Lines Group-Air Compressor; Air Compressor Lines Group | 1 |
4n3923 Turbocharger Oil Lines Group
| 4N***23 | Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group | 1 |
4n3924 Turbocharger Oil Lines Group
| 4N***24 | Lines Group-Turbocharger Oil; Turbocharger Oil Lines Group | 1 |
Exhaust Manifold (2p6571 N/S)
| 2P***71 | Manifold Group-Exhaust; Exhaust Manifold Group | 1 |
Exhaust Manifold (2p6570 N/S)
| 2P***70 | Manifold Group-Exhaust; Exhaust Manifold Group | 1 |
2p7349 Exhaust Pipe Group
| 2P***49 | Pipe Group-Exhaust; Exhaust Pipe Group | 1 |
4n8737 Exhaust Pipe Group
| 4N***37 | Pipe Group-Exhaust; Exhaust Pipe Group | 1 |
3p138 Exhaust Pipe Group
| 3P***38 | Pipe Group-Exhaust; Exhaust Pipe Group | 1 |
4n6858 Turbocharger Group
| 4N***58 | Turbocharger Group | 1 |
4n6856 Turbocharger Group
| 4N***56 | Turbocharger Group; Turbocharger Group | 1 |
1p34 Turbocharger Group (1p8533 N/S)
| 1P***34 | Turbocharger Group | 1 |
4n6859 Turbocharger Group
| 4N***59 | Turbocharger Group | 1 |
4n6857 Turbocharger Group
| 4N***57 | Turbocharger Group; Turbocharger Group | 1 |
1p9136 Turbocharger Group (1p9137 N/S)
| 1P***36 | Turbocharger Group | 1 |
Turbocharger Oil Lines (2p7430 N/S)
| 2P***30 | Turbocharger Oil Lines Group | 1 |
Turbocharger Oil Lines (2p7353 N/S)
| 2P***53 | Turbocharger Oil Lines Group | 1 |
Lower Structure
2p6186 Oil Pan Fastener Group
| 2P***86 | Fastener Group-Oil Pan; Oil Pan Fastener Group | 1 |
2p6189 Oil Pan Fastener Group
| 2P***89 | Fastener Group-Oil Pan; Oil Pan Fastener Group | 1 |
2p6491 Oil Level Gauge Group
| 2P***91 | Gauge Group-Oil Level (Dipstick) | 1 |
2p990 Oil Level Gauge Group
| 2P***90 | Gauge Group-Oil Level (Dipstick) | 1 |
2p6494 Oil Level Gauge Group
| 2P***94 | Gauge Group-Oil Level (Dipstick); Oil Lever Gauge Group | 1 |
Oil Pan (2p6155 N/S)
| 2P***55 | Pan Group-Oil; Oil Pan Group | 1 |
2p6175 Oil Pan Group
| 2P***75 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
Lubrication System
Breather (1p4244 N/S)
| 1P***44 | Breather Group | 1 |
4n9821 Oil Filler Group
| 4N***21 | Filler Group-Oil; Oil Filler Group | 1 |
2p6855 Oil Filler Group
| 2P***55 | Filler Group-Oil | 1 |
4n4817 Oil Filler Group
| 4N***17 | Filler Group-Oil; Oil Filler Group | 1 |
2p6475 Oil Filter Group
| 2P***75 | Filter Group-Engine Oil; Oil Filter Group (10z1 ~ 10z7023) | 1 |
2p6525 Oil Filter Group
| 2P***25 | Filter Group-Oil | 1 |
Fumes Disposal (2p7446 N/S)
| 2P***46 | Fumes Disposal | 1 |
4n3325 Fumes Disposal Group
| 4N***25 | Fumes Disposal Group; Fumes Disposal Group | 1 |
2p7447 Fumes Disposal Group
| 2P***47 | Fumes Disposal Group | 1 |
3n3392 Fumes Disposal Group
| 3N***92 | Fumes Disposal Group; Fumes Disposal Group | 1 |
2p6512 Oil Lines Group
| 2P***12 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
2p6513 Oil Lines Group
| 2P***13 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
2p6857 Oil Filler Group
| 2P***57 | Oil Filler Group | 1 |
Oil Filler (2p6857 N/S)
| 2P***57 | Oil Filler Group | 1 |
2p1785 Oil Pump Group
| 2P***85 | Pump Group-Engine Oil | 1 |
2p1784 Oil Pump Group
| 2P***84 | Pump Group-Engine Oil; Engine Oil Pump Group | 1 |
Rear Structure
Flywheel (7s7878 N/S)
| 7S***78 | Flywheel Group; Flywheel Group | 1 |
Flywheel (7s7877 N/S)
| 7S***77 | Flywheel Group; Flywheel Group | 1 |
7s7753 Flywheel Group
| 7S***53 | Flywheel Group; Flywheel Group | 1 |
Flywheel (2p976 N/S)
| 2P***76 | Flywheel Group; Flywheel Group | 1 |
Flywheel Housing (5c3176 N/S)
| 5C***76 | Flywheel Housing | 1 |
5c3176 Flywheel Housing Group
| 5C***76 | Flywheel Housing | 1 |
5c3193 Flywheel Housing Group
| 5C***93 | Flywheel Housing Group | 1 |
2p6813 Flywheel Housing Group
| 2P***13 | Flywheel Housing Group | 1 |
Flywheel Housing (2p6166 N/S)
| 2P***66 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2p6119 Flywheel Housing Group--Type 2
| 2P***19 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2p6119 Flywheel Housing Group
| 2P***19 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2p6119 Flywheel Housing Group--Type 1
| 2P***19 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
2p6166 Flywheel Housing Group
| 2P***66 | Housing Group-Flywheel; Flywheel Housing Group | 1 |
Upper Structure
Valve Mechanism Cover (2p6514 N/S)
| 2P***14 | Cover Group-Valve Mechanism; Valve Mechansim Cover Group | 1 |
4n7444 Cylinder Head Assembly
| 4N***44 | Cylinder Head Assembly | 1 |
2p6484 Cylinder Head Group
| 2P***84 | Cylinder Head Group; Cylinder Head Group | 1 |
2p6274 Cylinder Head Group
| 2P***74 | Cylinder Head Group; Cylinder Head Group | 1 |
Cylinder Head Fastener (2p6544 N/S)
| 2P***44 | Fastener Group-Cylinder Head; Cylinder Head Fastener Group | 1 |
1p3840 Lifting Eye Group
| 1P***40 | Lifting Group; Lifting Eye Group | 1 |
Valve Mechanism (2p6524 N/S)
| 2P***24 | Valve-Mechanism Group; Valve Mechanism Group | 1 |
950 serial number reference
On the original Cat 950 (1965–1981 production), the serial number plate is a riveted metal tag located on the right (curb) side of the machine above and forward of the front axle. The plate displays a serial number whose first three alphanumeric characters (e.g., '81J', '31K', '49U') are the prefix identifying the production series, plant of manufacture, and configuration, followed by a five-digit sequence number. To read the prefix: locate and clean the plate, note the first three characters before the numeric sequence, and cross-reference against parts.cat.com or Cat SIS using the full serial number. Note that additional early prefixes (15J and 99A) are confirmed to exist in a jensales.com operators manual alongside 58H and 90A, but their country of origin and sub-range details were not resolvable in public sources and are not included here pending dealer or SIS verification.
| Prefix | Identifies | Notes |
|---|---|---|
| 90A | Cat 950 Wheel Loader / Traxcavator — US-built, first production series | Serial range 90A1 through 90A3142; manufactured 1965–1968. Fitted with the D330T or D330A engine. Exact rated output uncertain — verify with dealer or SIS lookup. |
| 58H | Cat 950 Wheel Loader / Traxcavator — Canada-built, equivalent to 90A | Serial range 58H1 through 58H520; manufactured 1965–1968. Fitted with the D330A engine. Serial 58H515 documented as 1968 Canada-built. Country of manufacture: Canada. |
| 81J | Cat 950 Wheel Loader — US-built, main production run | Four documented sub-ranges per SIS catalog. Later sub-ranges powered by the 3304 engine. Engine fitment for the two earlier sub-ranges consistent with D330-series but the precise D330-to-3304 breakpoint uncertain — verify with dealer or SIS lookup. Country of origin: US. Produced from approximately 1968 into the late 1970s. |
| 43J | Cat 950 Wheel Loader — Belgium-built export variant | Serial range 43J1 and up; production began approximately 1968. Country of manufacture confirmed as Belgium by serialbox.me. Covered by the same service manual as 31K, 81J, and 73J. Engine fitment mirrors US counterpart but sub-range engine breakpoints not independently confirmed — confirm with dealer or SIS lookup. |
| 73J | Cat 950 Wheel Loader — Japan-built variant, production from approximately 1968 | Country of manufacture confirmed as Japan by serialbox.me. Listed in avspare.com parts catalog alongside 31K, 43J, 81J under base 950 Wheel Loader. Operators manual covers 73J serials in the same book as 81J and 31K. Engine type and sub-range breakpoints not independently confirmed — confirm with dealer. |
| 31K | Cat 950 Wheel Loader — US-built, later production run with documented engine change | Serial range 31K667 (1968) through 31K3129 (1981). Initially fitted with D330T engine; engine changed to 3304 during production. Exact changeover serial varies by sub-range — verify with dealer or SIS lookup. |
| 49U | Cat 950 Tree Harvester — forestry-configured variant of the base 950, from 1972 | Serial range 49U00001 and up; production from 1972. Two documented sub-ranges per avspare.com SIS catalog: earlier units with a basic engine and later units fitted with the 3304 vehicular engine. The specific engine model for the early sub-range units is not independently confirmed — retain only the verified framing. Confirmed as a distinct Tree Harvester designation by Amazon service manual listing and avspare.com catalog headers. |
Frequently asked questions
What engine does the Caterpillar 950 wheel loader use?
Engine fitment varied by generation. The original 1965 950 used the Cat D330A; late-1960s through early-1980s units used the Cat 3304T (approximately 97 kW / 130 hp). The 950B and 950E continued with the turbocharged 3304T (approximately 117–119 kW / 155–160 hp net). The 950F used the Cat 3116 inline-six (approximately 127 kW / 170 hp net). The 950H moved to the Cat C7 ACERT at 148 kW / 197 hp, and all subsequent series — 950K, 950M, and the current 2022-onward 950 — use the Cat C7.1 ACERT, producing approximately 168–186 kW (225–249 hp) net depending on variant and configuration.
What is the operating weight of the Caterpillar 950 wheel loader?
Operating weight increased substantially across generations and varies by configuration. The 950B weighed approximately 14,700 kg (32,400 lb); the 950E approximately 15,570 kg (34,300 lb); the 950F approximately 15,710 kg (34,680 lb); the 950H approximately 18,400–19,500 kg (40,570–43,000 lb); and the current 950 (2022-onward) approximately 19,260 kg (42,460 lb) in standard configuration.
What model replaced the Caterpillar 950, and what did the 950 itself replace?
Within the 950 family the generational succession ran: original 950 → 950B (1981) → 950E (1988) → 950F / 950F II (1993) → 950G (1998) → 950H (2006) → 950K (2012) → 950M (2014) → current 950 (2022). The 950K notably absorbed the IT62H Integrated Toolcarrier when Caterpillar consolidated those linkage lines. The current 950 (2022) supersedes the 950M and is offered in GC, standard, Performance, and XE (extended efficiency) trim levels. Caterpillar traces the broader medium wheel loader lineage to the 944 Traxcavator of the early 1960s.
What 950 owners discuss
What engine does the original Caterpillar 950 wheel loader use, and what are its known quirks?
The original Caterpillar 950 (mid-1960s through early 1980s, serial prefixes including 90A, 58H, 81J, and 31K) was powered by the Caterpillar D330A or D330T four-cylinder naturally aspirated diesel, with later units transitioning to the 3304T turbocharged engine producing around 97 kW (130 hp). Community consensus on ACMOC and Heavy Equipment Forums identifies several recurring quirks. The D330/D333 family is documented as prone to cracking between valve seats when run hot, and the precombustion chambers corrode through from the water-jacket side when coolant is neglected — a corroded chamber can fill a cylinder with coolant overnight, causing hydraulic lock on the next cold start. Early production runs had a known cooling-circulation problem where coolant moved too fast to shed heat adequately; the factory-documented fix was welding a restrictor washer into the thermostat neck to slow flow. Sourcing cylinder heads for the D330T has been reported as extremely difficult; anyone acquiring a high-hour original 950 should verify head condition before purchase.
How does the powershift transmission behave when it starts slipping or losing forward gears, and what should be checked first?
Forum threads covering the 950 and related loader transmissions describe a consistent pattern: the machine performs normally when cold but loses drive in one or more forward or reverse ranges once oil temperature climbs. Mechanics cite worn clutch pack friction material as the primary cause — hot oil thins sufficiently that a marginally worn clutch disc can no longer hold under load, whereas the same clutch will engage when oil is cool and viscous. The recommended diagnostic sequence: (1) check and replace the transmission filter and suction screen first — a plugged screen drops pump output enough to mimic clutch failure; (2) with engine at high idle, measure clutch engagement pressure at the filter housing test port, which should be roughly 2,760–2,900 kPa (approximately 400 psi) depending on configuration — a drop in one or two selected gears while others remain normal points to a specific clutch pack rather than a pump; (3) compare torque converter inlet and outlet pressures — if outlet drops below inlet, converter internal clearances are excessive; (4) inspect the filter element after cutting it open for aluminum particles (torque converter) or copper-colored debris (clutch disc friction material). Running the correct Cat TDTO (TO-4 specification) fluid at the proper level is strongly emphasized as the most effective preventive measure.
What hydraulic system problems do owners most commonly report on the Cat 950 wheel loader?
Across forum threads, owners and mechanics consistently identify four hydraulic failure patterns. First, implement drift — a loaded bucket that slowly uncurls or drops while the operator holds position — is traced to worn spool valves in the main control valve, bypassing cylinder piston seals, or load-check valves that fail to seat correctly. Second, boom cylinders are hotspots for external seal leaks on older machines, particularly where hoses attach to cylinder ports. Third, high-pitched pump whine or cavitation noise points to a clogged suction strainer or fluid level too low, which if ignored rapidly destroys the gear-type pump. Fourth, slow or weak bucket and tilt response under load is linked to a main relief valve set too low, a worn pump producing insufficient flow, or contaminated fluid blocking the control valve passages. The tilt cylinder linkage center pin is specifically called out as a wear point that can become loose and eventually fracture the rod eye of the tilt cylinder if left uninspected. On any 950 with unknown history, a complete hydraulic fluid and filter change is the community's standard first step before fault-chasing.
What steering behavior issues are owners of the original Cat 950 loader most likely to encounter?
The original 950 uses a mechanical-hydraulic steering system with manual linkage running from the steering column through a signal lever to the hydraulic control valve. ACMOC forum veterans document a characteristic shimmy or oscillation when making fine steering corrections: the machine executes wide sweeps smoothly but shakes erratically when the operator tries to hold a precise heading. Root causes include accumulated wear in the ball joints on the front frame connection arms, worn rod ends on the steering linkage, and lost motion at the signal lever's engagement point inside the hydraulic valve. Bent front-frame connection arms — caused by turning the machine with the engine off and forcing the hydraulic circuit against its stops — are also cited as a contributor. The community standard fix is a thorough greasing of all articulation and steering cylinder pivot points as the first step, followed by inspection of all rod ends and linkage pins for slop. Safety note: linkage adjustments on the original 950 steering system affect braking and directional control simultaneously — have your dealer verify any steering system adjustment or component replacement.
What wear patterns and structural concerns are typical on high-hour original Cat 950 machines?
Forum restoration threads and inspection guides identify a consistent set of concerns for high-hour original 950 loaders. Loader arm bushings are a primary wear point: on very high-hour machines the bushings work outward from the bores in the loader arms, and if this goes far enough it requires professional machining or sleeve repair beyond simple bushing replacement. The center pins at the articulation joint develop side-to-side play as bushings degrade, which if ignored galls the pin bores. Frame cracks around previous weld repairs are frequently found hiding under paint or undercoating, particularly around the articulation hitch and front frame connection arms. On machines worked in wet or road-salt environments, cab rust can be severe. The precombustion chamber area of the D330-series cylinder head and the coolant passages surrounding them are a documented structural vulnerability — externally visible coolant staining around the head or excessive makeup water consumption are serious flags. The restoration community notes that machines with very high operating hours are likely to need professional machining of multiple bores and may require a head rebuild or replacement before returning to reliable service.
What should a buyer check when inspecting a used original Cat 950 wheel loader before purchase?
Community consensus from forums, auction inspection guides, and expert Q&A converges on this pre-purchase checklist. Engine and cooling: inspect for external coolant staining around the cylinder head (precombustion chamber leaks), check oil for a milky or frothy appearance indicating coolant intrusion, and verify the radiator is not plugged. Transmission and torque converter: with the machine fully warmed up, shift through all forward and reverse ranges and note any slip; pull the transmission filter and examine the element for aluminum particles (converter failure) or copper-tinted friction debris (clutch pack wear); verify the transmission oil is the correct TO-4 spec and not motor oil. Hydraulics: cycle the bucket through full lift and curl with a load and check for drift over a thirty-second hold; listen for pump whine. Steering linkage: grasp the front and rear frames and attempt to move them relative to each other — any play beyond a small amount in the articulation joint indicates worn pins and bushings. Tires and rims: a single large loader tire is a significant cost item; check tread depth and inspect sidewalls for cuts or bulges. Brakes: the original 950 uses an air-over-hydraulic brake system — verify the air compressor builds pressure correctly and the machine stops in a straight line. Oil sampling: commission a Cat S.O.S. or equivalent fluid analysis on engine oil, transmission oil, and hydraulic fluid before finalizing any purchase.
What do experienced owners say about the air-over-hydraulic brake system on the original Cat 950, and what are the common failure points?
The original Caterpillar 950 uses an air-over-hydraulic brake circuit in which compressed air acts on a hydraulic master to apply the wheel brakes. Three recurring failure modes: First, air leaks or a failed air-dryer allow moisture to accumulate; in cold conditions this can freeze the system, and chronic moisture accelerates corrosion of brake components. Second, diaphragm damage or corrosion in the brake chambers causes partial or total loss of actuation force — particularly common on machines that sat outdoors for extended periods. Third, the hydraulic accumulators that store emergency brake pressure can fail when the nitrogen charge dissipates or the internal bladder seal fails; a working accumulator should be verified by shutting off the engine, waiting briefly, and verifying that the brake pedal provides firm resistance through several applications. Checking the accumulator nitrogen charge valve for oil residue is the standard field test — a dry valve indicates intact seals, while oil at the valve face indicates bladder failure. Older brake adjustment hardware can also seize from lack of service, leaving effective brake travel shorter than it appears on inspection. Safety note: any suspected issue with the accumulator, master cylinder, or air circuit should be diagnosed and repaired by a dealer-certified technician before the machine is returned to service.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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