Caterpillarwheel-type loaderwheel loader
Caterpillar 950G II
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 950G II is a medium wheel-type loader built on the third iteration of Cat's G-Series 3-4 cubic meter loader platform. It runs the Cat 3126B ATAAC diesel, an air-to-air aftercooled inline-six paired with the ADEM III electronic control module, rated at 136 kW (183 hp) net and certified to EPA Tier 2 emissions. Standard operating weight is about 17,780 kg (39,198 lb); high-lift, waste handling, and forestry configurations run heavier depending on counterweight and boom geometry. Caterpillar built the 950G II roughly from 2001-2002 through 2005-2006, replacing the Tier 1, mechanically governed 950G and giving way to the 950H when the next generation arrived.
The Series II update was mainly an emissions and cooling-system revision rather than a structural redesign: the mechanically governed 3126 DITA gave way to the electronically controlled 3126B ATAAC, and Caterpillar added a swing-out grille, a low-fin-density radiator, and a variable-speed on-demand fan to keep the tighter Tier 2 engine cool in dirty environments. The pressurized, sound-suppressed ROPS/FOPS cab and Command Control electro-hydraulic steering carried over from the late-build 950G. In the used and parts market today the 950G II sits in a well-supported middle ground: old enough to be affordable, common enough that engine, transmission, and driveline parts remain in circulation, and mechanically simple enough for independent shops to service without the dealer-only diagnostic tooling later ACERT-generation loaders require.
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 II specifications
Engine
| Engine model | Cat 3126B with ATAAC (air-to-air aftercooling), inline 6-cylinder diesel |
| Net power | 136 kW (183 hp) |
| Gross/maximum power | 146 kW (196 hp) at 2200 rpm |
| Displacement | 7.2 L (439-442 cu in) |
| Bore x stroke | 110 mm x 127 mm (4.3 in x 5.0 in) |
| Peak torque | 907 N*m (669 lb-ft) at 1400 rpm |
| Emissions tier | Meets U.S. EPA Tier 2 off-highway emissions standards |
| Generation note | Series II replaced the earlier 950G's 3126 DITA engine with the updated 3126B ATAAC; the earlier plain 950G is a distinct, lower-rated engine calibration and its figures are not carried over here |
Weights
| Operating weight | 17,780 kg (39,198 lb), standard configuration with general-purpose bucket |
| Static tipping load, full turn | 10,619 kg (23,411 lb) |
| Shipping/ground pressure | Not published for this wheel-type loader configuration; not typically listed for this class of machine |
Dimensions
| Length with bucket on ground | 8.03 m (26 ft 4 in) |
| Width over tires | 2.89 m (9 ft 6 in) |
| Height to top of cab | 3.50 m (11 ft 6 in) |
| Ground clearance | 402 mm (1 ft 4 in) |
| Reach at maximum lift and dump | 1.27 m (4 ft 2 in) |
| Tire size | 20.5-25, 12PR (L-2) |
| Wheelbase | Not confirmed from a source tied specifically to this generation; verify with your dealer if needed |
Performance
| Travel speed, forward (top gear) | Up to 37 km/h (23 mph) |
| Travel speed, reverse (top gear) | Up to 40 km/h (25 mph) |
| Breakout force | 154.2 kN (34,666 lb) |
| Bucket capacity range | 2.7-3.5 m3 (3.5-4.5 yd3) depending on bucket selection |
Service capacities (summary)
| Fuel tank | 285 L (75.3 US gal) |
| Hydraulic system | 153 L (40 US gal) |
| Engine oil | 30 L (8 US gal) |
| Cooling system | 55 L (14.5 US gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
950G II fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 30 L (7.9 US gal) | Cat DEO diesel engine oil, API CH-4 or higher. SAE 10W-30 for ambient -18°C to 40°C (0°F to 104°F); SAE 15W-40 for -9.5°C to 50°C (15°F to 122°F). Change interval up to 500 hours with Cat S·O·S oil analysis. |
| Cooling system | 55 L (14.5 US gal) | Cat Extended Life Coolant (ELC) antifreeze, factory pre-mixed to 50% concentration, freeze protection to -34°C (-29°F). Extended-life formula rated to 6,000-hour service intervals. |
| Fuel tank | 285 L (75.3 US gal) | No. 2-D diesel fuel. |
| Transmission | 34 L (9.0 US gal) | Cat TDTO (Transmission/Drive Train Oil). SAE 10W for cold ambient conditions, SAE 30 for normal/warm ambient range; select grade from the lubricant-viscosity-by-temperature chart. Daily level check by ground-level sight gauge; sampling valve provided for oil analysis. |
| Differential and final drives, front axle | 36 L (9.5 US gal) | Cat TDTO, same grade selection as the transmission. Service brakes are enclosed and oil-bathed in this axle fluid. |
| Differential and final drives, rear axle | 36 L (9.5 US gal) | Cat TDTO, same grade selection as the transmission and front axle. |
| Hydraulic system, including tank | 153 L (40.0-40.5 US gal) | Cat HYDO hydraulic oil. SAE 10 grade for typical ambient range (about -20°C to 40°C / -4°F to 104°F); heavier SAE 30 grade available where sustained high ambient heat calls for it. Implement and pilot pumps are rated using SAE 10W oil. |
| Hydraulic tank (standalone) | 88 L (23.2-23.3 US gal) | Same Cat HYDO oil as the full hydraulic system. |
| Grease, all fittings | Spec only, not capacity-rated | Cat Multipurpose Grease (Cat MPGM), NLGI grade 2, rated -30°C to 40°C (-22°F to 104°F), for bucket/loader-linkage pins, tilt and steering cylinder pins, and rear-axle oscillation bearings. A moly-fortified multipurpose grease is the fallback where extreme load or wear resistance is needed. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 950G II maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
| Every 6,000 h |
|
| Every 12,000 h |
|
Servicing the 950G II beyond the schedule
Predictive Maintenance & Fluid Analysis
The 3126B ATAAC and ADEM III control module give this loader real diagnostic depth. Pull an engine oil sample every 250 hours, transmission and hydraulic samples every 500 hours, and coolant samples at 500 hours and annually. Trend turbocharger and aftercooler wear, ADEM III fuel system drift, and planetary transmission clutch degradation before they show up as power loss or hard shifts. On high-hour units, sampling catches wear metal from the differential and final drives long before a teardown would.
Corrective & Common Repairs
Command Control Steering runs through an implement ECM and hand-metering unit rather than a mechanical linkage; corrosion at ECM and CAN wiring connectors is the most common cause of no-shift or no-steer faults on this generation. A plugged transmission suction screen shows up as hard or delayed shifts. Hydraulic control valve solenoid wiring corrosion causes intermittent loader function loss even with normal system pressure. Check connectors and grounds before condemning a pump or valve.
Overhaul & Rebuild Points
Wear concentrates in the powertrain and driveline on high-hour 950G II units: planetary powershift clutch packs and the Free Wheel Stator torque converter, the 3126B turbocharger and ATAAC core, and the differential/final drive gear sets. Articulation and steering cylinder reseals, axle oscillation bearing replacement, and center-hitch pin and bushing wear are typical rebuild-point work. Budget engine and transmission overhaul planning around the extended service-oil intervals rather than a fixed hour number, since duty cycle drives wear rate more than calendar time.
Seasonal & Environment Servicing
In hot or dusty applications, use the swing-out grille to clean both sides of the radiator, hydraulic oil cooler, and AC condenser cores; the low-fin-density design sheds debris but still packs in demolition or waste-handling work. Clean the cab air filter more often than the standard interval. In cold climates, verify ELC coolant protection level, keep the block heater and starting aid serviceable, and check the variable-speed on-demand fan drive so it isn't lagging in freezing conditions.
950G II fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CID 0100 FMI 04 | Engine oil pressure signal low or circuit shorted to ground. | Oil pressure sensor wiring shorted low, failed sensor, or genuinely low oil pressure from pump wear or low oil level. | Check engine oil level first. Inspect sensor wiring and connector for a ground short before replacing the sensor. |
| CID 0110 FMI 00 | Engine coolant temperature above normal operating range. | Low coolant level, blocked radiator core, slipping or failed fan drive, or a stuck thermostat. | Check coolant level and radiator fins for blockage. Verify fan operation before inspecting the temperature sensor circuit. |
| CID 0190 FMI 08 | Engine speed/timing sensor signal abnormal or lost. | Damaged sensor, excessive air gap, or open/shorted wiring between the sensor and ECM. | Check sensor air gap and connector condition. Test wiring continuity before replacing the speed-timing sensor. |
| CID 0164 FMI 02 | Injection actuation pressure signal erratic, intermittent, or incorrect. | Contaminated or aerated oil supply to the high-pressure oil pump, a loose sensor connector, or a failing pressure sensor. | Check engine oil level and condition, inspect the sensor connector, then verify sensor output on Cat ET before replacement. |
| CID 0253 FMI 02 | Personality module (ECM software/rating) data incorrect or mismatched. | Corrupted flash file, wrong rating loaded during a reflash, or an internal ECM fault. | Reflash the ECM with the correct engine rating using Cat ET. Replace the ECM if the fault persists. |
| CID 0168 FMI 02 | Machine electrical system (battery) voltage erratic or intermittent. | Loose or corroded battery cable, poor machine ground connection, or a failing charging circuit. | Check battery terminals and ground straps, then test charging system output. |
| CID 0621 FMI 03 | Transmission downshift switch voltage above normal (shorted to power). | Stuck or internally shorted downshift switch, or a pinched wire shorting the circuit to battery voltage. | Check the downshift switch and its wiring for a short to power before replacing the switch. |
| CID 0248 FMI 09 | Data link communication abnormal between machine ECMs. | Damaged data link wiring, a loose connector, or one ECM (engine, transmission, or implement) not powering up or communicating. | Check power and ground to all ECMs, inspect data link wiring and connectors, then confirm each module responds on Cat ET. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
950G II attachments & work tools
General-purpose and quick-coupler buckets
General-purpose buckets cover excavation, stockpiling and dozing; quick-coupler buckets use the same GP profile but add factory horizontal pin-lock compatibility. Bucket capacity for this loader spans roughly 2.7-4.0 m3 (3.5-5.2 yd3) depending on profile and counterweight/tire setup, so confirm the exact size against the intended duty cycle.
Ground engaging tools (GET)
Buckets take bolt-on cutting edges in standard, heavy-duty, or abrasion-resistant material grades, plus bolt-on teeth with a choice of tip profiles. Corner protectors and wear plates are offered to extend bucket life in abrasive material.
Specialty and material-handling buckets
A material-handling bucket uses a flat-floor design for free-flowing stockpile material. Specialty variants include rock, refuse, and coal buckets for industry-specific duty, plus a coal bucket with bolt-on cutting edges, a woodchip bucket with visibility screens for light material, and a side-dump bucket for working in congested sites.
Pallet and lumber forks
Pallet forks are offered with a choice of tine lengths for palletized-load handling, and lumber/log forks come in millyard or floating-tine styles. Both mount through the loader's standard coupler system; confirm exact tine length and load rating with the dealer for the specific job.
Material handling arm
An adjustable-length material handling arm attachment is offered for manipulating pipe, precast concrete sections, and similar loads, with load capacity varying by arm length and configuration.
Hydraulic reversible plow
A hydraulic reversible plow is available for site-clearing work, angling roughly 30 degrees to the left or right under hydraulic control from the cab.
Angle broom
A manually-angled broom (BA30 class) is offered for sweeping paved areas such as parking lots and runways, mounted through the loader's standard work-tool coupler.
Coupler and mounting system
Work tools mount through a factory-installed horizontal pin-lock quick coupler with steel hydraulic lines for tool functions. The coupler is hydraulically actuated and controlled by an in-cab electric switch with a safety lock-out to prevent accidental release.
Guarding and notable factory options
A heavy-duty airborne debris grille with fine (about 4 mm) perforations is available to protect the cooling package in dusty or debris-heavy work. Front or rear limited-slip differentials and a rear No-SPIN differential are offered as traction options, and factory features such as Ride Control (selectable pitch-smoothing modes) and Command Control steering are commonly specified alongside work-tool use. Product Link wireless communication and a Machine Security System are also offered as factory options.
All 950G II assemblies by section
Every catalogued assembly group for the Caterpillar 950G II. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
202-7408 Lines Gp-Air -Custom
| 16***74 | Washer | 4 |
| 19***93 | Tube | 1 |
| 19***94 | Tube | 1 |
200-7137 Precleaner Gp
| 12***37 | Precleaner As; -Air Cleaner-Air Inlet | 1 |
| 20***37 | Precleaner Group | 1 |
| 20***38 | Precleaner Group | 1 |
Braking System
200-1315 Brake Gp-Parking
| 20***15 | Brake Group-Parking | 1 |
| 20***16 | Camshaft | 1 |
| 3B***12 | Lockwasher (3/4") Transfer Gear Case To Frame Mounting | 2 |
199-8518 Lines Gp-Service Brake -Custom
| 09***45 | Washer; (16.6x24x1.2-mm Thk) | 6 |
| 10***30 | Hose Assem. | 1 |
| 10***52 | Tee-Union | 1 |
106-1774 Valve Gp-Brake Control -Parking
| 10***74 | Valve Group-Brake Control; -Parking | 1 |
| 4J***33 | Seal Fuel Injection Pump | 2 |
| 9S***01 | Plug-O-Ring; (5/16-24 Thd) | 2 |
229-1937 Valve Gp-Brake Control -Custom
| 10***30 | Hose Assem. | 1 |
| 10***52 | Tee-Union | 1 |
| 10***46 | Rod-Control | 1 |
Cooling System
223-6201 Radiator & Fan Gp -Custom
| 12***07 | Mount As-Resilient | 2 |
| 13***38 | Adapter | 1 |
| 16***76 | Bolt | 6 |
Electrical And Starting System
198-4588 Alternator Gp-Charging -Custom
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 2 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
3e-7577 Alternator Gp-Charging
| 10***31 | Fan-Alternator; (11-Blade) | 1 |
| 10***32 | Collar; (Alternator) | 1 |
| 10***56 | Diode As; (Alternator) | 1 |
229-1450 Panel & Mtg Gp-Circuit Breaker -Custom
| 16***79 | Bolt | 4 |
| 19***98 | Panel Group-Circuit Breaker | 1 |
| 22***62 | Washer | 4 |
228-3571 Panel Gp-Circuit Breaker -Custom
| 0S***70 | Cap Screw (5/8" Long) | 2 |
| 10***05 | Kit-Receptacle; (6-Pin)(Display Monitor Harness) | 1 |
| 12***02 | Switch Group-Magnetic; -Starting Motor, Start Relay | 1 |
193-2550 Sensor Gp-Speed
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 17***49 | Strap; (Marker) | 1 |
| 19***50 | Sensor Group-Speed; -Tmsn, Torque Converter Output | 1 |
229-1939 Switch Gp-Disconnect -Custom
| 16***79 | Bolt | 4 |
| 18***18 | Washer | 4 |
| 18***89 | Washer; (6.4x12.5x1.6-mm Thk) | 2 |
167-0138 Switch Gp-Magnetic -Main Relay
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***38 | Switch Group-Magnetic; -Main Relay-Main Power Relay | 1 |
| 3E***62 | Wedge-Plug Lock; (2-Pin) | 1 |
125-1302 Switch Gp-Magnetic -Start Relay
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 12***02 | Switch Group-Magnetic; -Starting Motor, Start Relay | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
197-4147 Switch Gp-Ride Control
| 10***33 | Switch As-Rocker; (Ride Control) | 1 |
| 19***47 | Switch Group-Ride Control; (Ride Control) | 1 |
| 3E***80 | Actuator-Rocker | 1 |
197-6476 Switch Gp-Secondary Steering
| 14***01 | Switch As-Rocker; (Secondary Steering Test) | 1 |
| 14***02 | Actuator-Rocker | 1 |
| 14***03 | Switch As-Rocker; (Secondary Steering Test) | 1 |
200-2725 Wiring Gp-Air Conditioner
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***33 | Switch As-Pressure; (A/C) | 1 |
| 13***00 | Clip; (Tab) | 2 |
224-4767 Wiring Gp-Cab -Custom
| 10***04 | Kit-Receptacle; (4-Pin)(Start Switch) | 1 |
| 13***87 | Screw; (M4x0.7x12-mm) | 2 |
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 1 |
209-2116 Wiring Gp-Ride Control
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 15***55 | Kit; (Connecting Plug) (12-Pin) (Includes Plug As Wedge & Interface Seal) | 1 |
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
190-5100 Wiring Gp-Secondary Steering
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***11 | Cable Assem. | 1 |
Frame And Body
192-6084 Lines Gp-Automatic Lubrication -Custom
| 19***80 | Mounting Group-Lubrication Lines; -Custom | 1 |
| 19***84 | Lines Group-Automatic Lubrication; -Custom | 1 |
| 19***21 | Valve & Lines Group-Lubrication; -Custom | 1 |
192-6075 Lines Gp-Automatic Lubrication -Custom
| 19***75 | Lines Group-Automatic Lubrication; -Custom | 1 |
| 19***76 | Mounting Group-Lubrication Lines; -Custom | 1 |
| 19***20 | Valve & Lines Group-Lubrication; -Custom | 1 |
192-5913 Lines Gp-Automatic Lubrication -Custom
| 19***13 | Lines Group-Automatic Lubrication; -Custom | 1 |
| 19***17 | Mounting Group-Lubrication Lines; -Custom | 1 |
| 19***84 | Hose As | 2 |
228-6313 Lines Gp-Grease -Custom
| 17***37 | Hose Assem. | 2 |
| 20***55 | Tube Assem. | 1 |
| 20***56 | Tube Assem. | 1 |
197-0344 Lubrication Ar-Automatic -Custom
| 14***55 | Receptacle As | 1 |
| 14***73 | Receptacle As | 1 |
| 17***47 | Block Group-Lube Lines Support | 1 |
192-6076 Mounting Gp-Lubrication Lines -Custom
| 11***25 | Clamp-Double | 1 |
| 12***40 | Clamp-Single | 1 |
| 14***35 | Bolt | 2 |
192-5917 Mounting Gp-Lubrication Lines -Custom
| 16***79 | Bolt | 6 |
| 16***81 | Washer | 6 |
| 17***92 | Clamp | 1 |
192-6080 Mounting Gp-Lubrication Lines -Custom
| 16***79 | Bolt | 10 |
| 16***81 | Washer | 12 |
| 16***29 | Sleeve; (200cm) | 0 |
195-9833 Pin Gp-Hood -Custom
| 12***30 | Pin Assem. (R. H.) | 1 |
| 12***31 | Pin Assem. (L. H.) | 1 |
| 19***21 | Pin As; (Rh) | 1 |
197-1525 Protection Ar-Hardware -Custom
| 14***35 | Bolt | 2 |
| 14***36 | Bolt | 6 |
| 16***76 | Bolt | 8 |
192-6182 Pump & Mtg Gp-Lubrication -Custom
| 16***75 | Bolt | 4 |
| 16***76 | Bolt | 4 |
| 16***80 | Washer | 4 |
192-6121 Valve & Lines Gp-Lubrication -Custom
| 16***30 | Hose; (208-cm Each) | 0 |
| 16***31 | Hose; (229-cm Each) | 0 |
| 17***24 | Plug | 7 |
192-6120 Valve & Lines Gp-Lubrication -Custom
| 17***92 | Clamp | 2 |
| 17***24 | Plug | 6 |
| 17***25 | Plug | 2 |
192-6067 Valve Gp-Lube Distribution -Custom
| 16***76 | Bolt | 2 |
| 17***84 | Plug | 4 |
| 17***12 | Injector | 1 |
192-6078 Valve Gp-Lube Distribution -Custom
| 17***92 | Switch-Pressure; (Lubrication) | 1 |
| 17***96 | Block | 1 |
| 17***11 | Injector | 6 |
Hydraulic System
221-1756 Accumulator & Mtg Gp-Ride Cont
| 11***78 | Plate | 1 |
| 11***05 | Elbow-Fitting | 1 |
| 13***18 | Bracket | 1 |
190-5005 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 |
| 10***36 | Rod | 1 |
229-1974 Control Gp-Ride -Custom
| 19***47 | Switch Group-Ride Control; (Ride Control) | 1 |
| 20***19 | Control Ar-Ride; -2-Function Hydraulics | 1 |
| 21***17 | Valve & Mtg Group-Main Control; -2-Function | 1 |
224-2473 Hydraulic Ar-3 Valve -Custom
| 14***05 | Lines Group-Pilot; -3-Valve | 1 |
| 18***09 | Control Group-Pilot Operated Hydraulic; -2-Function | 1 |
| 19***05 | Control Group-Pilot Operated Hydraulic; -3-Function | 1 |
233-0979 Hydraulic Ar-3 Valve -Custom
| 14***05 | Lines Group-Pilot; -3-Valve | 1 |
| 18***09 | Control Group-Pilot Operated Hydraulic; -2-Function | 1 |
| 19***05 | Control Group-Pilot Operated Hydraulic; -3-Function | 1 |
231-2611 Lines Gp-Front -Custom
| 13***18 | Plate | 1 |
| 13***19 | Plate | 1 |
| 16***55 | Bracket | 2 |
229-8592 Lines Gp-Hydraulic -Custom
| 13***03 | Hose Assem. | 1 |
| 13***78 | Hose Assem. | 1 |
| 1P***79 | Flange (Half) | 4 |
229-1941 Lines Gp-Hydraulic -Custom
| 12***06 | Tube Assem. | 1 |
| 12***07 | Tube Assem. | 1 |
| 12***09 | Hose As | 2 |
145-2805 Lines Gp-Pilot
| 14***98 | Hose Assem. | 1 |
| 14***99 | Hose Assem. | 1 |
| 14***05 | Lines Group-Pilot; -3-Valve | 1 |
223-3312 Lines Gp-Ride Control
| 13***20 | Block | 1 |
| 14***81 | Valve Group-Shuttle; (Ride Control) | 1 |
| 16***03 | Hose As | 2 |
191-2943 Motor Gp-Gear -Hydraulic Fan
| 09***94 | Ring-Retaining | 1 |
| 13***29 | Bolt; (M12x1.75) | 4 |
| 13***30 | Washer; (12.5x18x1.5-mm Thk) | 4 |
229-2040 Valve & Mtg Gp-Main Control -Custom
| 12***72 | Tee | 1 |
| 13***00 | Clip; (Tab) | 1 |
| 14***15 | Valve Group-Pilot; -Oil Manifold | 1 |
118-5095 Valve Gp-Control -Auxiliary
| 09***91 | Bolt; (Locking) (M12x1.75x25mm) | 1 |
| 10***83 | Spring; (Outer) | 1 |
| 11***95 | Valve Group; (Auxiliary)(Auxiliary) | 1 |
223-5976 Valve Gp-Diverter -Ride Control
| 15***40 | Valve Group-Solenoid; -Reversing Fan, Ride Control | 1 |
| 1S***42 | Spring | 1 |
| 22***41 | Plug Assem. | 1 |
229-2437 Valve Gp-Main Control
| 00***63 | Seal-O-Ring; (55.24mm Id) | 3 |
| 09***91 | Bolt; (Locking) (M12x1.75x25mm) | 2 |
| 11***95 | Valve Group; (Auxiliary)(Auxiliary) | 1 |
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 |
153-0054 Valve Gp-Pilot
| 10***72 | Boot | 1 |
| 10***73 | Clamp-Boot | 1 |
| 10***28 | Valve Group-Pilot Cartridge; -Cartridge | 2 |
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 |
153-0055 Valve Gp-Pilot
| 10***72 | Boot | 1 |
| 10***73 | Clamp-Boot | 1 |
| 10***28 | Valve Group-Pilot Cartridge; -Cartridge | 2 |
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 |
107-3838 Valve Gp-Pilot Cartridge
| 10***37 | Plunger | 1 |
| 10***38 | Valve Group-Pilot Cartridge | 1 |
| 10***46 | Seat-Spring | 1 |
109-4854 Valve Gp-Pilot Cartridge
| 10***46 | Seat-Spring | 1 |
| 10***54 | Valve Group-Pilot Cartridge | 1 |
| 10***58 | Plunger | 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 -Line
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
| 4T***41 | Spring | 1 |
| 4T***71 | Plate | 1 |
4t-4162 Valve Gp-Relief -Line
| 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 |
4t-2742 Valve Gp-Relief -Line
| 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 |
135-5491 Valve Gp-Relief -Main
| 11***15 | Dowel | 1 |
| 13***91 | Valve Group-Relief | 1 |
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 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 |
143-9354 Valve Gp-Shutoff
| 11***61 | Seal Kit; (Includes Seals, Thrust Ring, Stem And Connectors) | 1 |
| 11***48 | Lever As | 1 |
| 12***54 | Plate; (6-mm Thk) | 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 |
141-1481 Valve Gp-Shuttle
| 12***57 | Valve Group-Shuttle | 1 |
| 14***81 | Valve Group-Shuttle; (Ride Control) | 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 |
152-8340 Valve Gp-Solenoid
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***43 | Locknut; (5/16-18-Thd) | 2 |
| 15***38 | Cartridge Assem. | 1 |
Implements
192-4616 Arm & Bearing As
| 10***74 | Crossmember | 1 |
| 11***23 | Stud-Weld; (M10x1.5x25-mm) | 2 |
| 12***38 | Plate As | 2 |
192-4615 Arm & Bearing As
| 11***23 | Stud-Weld; (M10x1.5x25-mm) | 3 |
| 19***15 | Arm & Bearing As | 1 |
| 21***81 | Block | 6 |
Machine Arrangement
196-8719 Conversion Gp-Machine -Custom
| 08***21 | Plate | 1 |
| 10***96 | Pin-Keeper | 1 |
| 11***91 | Bracket Assem. | 1 |
198-4586 Protection Ar-Corrosion -Custom
| 17***73 | Baffle | 1 |
| 18***50 | Radiator & Fan Group | 0 |
| 19***76 | Transmission Ar; -Freewheel Stator Torque Converter | 1 |
233-7349 Protection Ar-Corrosion -Custom
| 17***73 | Baffle | 1 |
| 18***50 | Radiator & Fan Group | 1 |
| 19***51 | Transmission Ar; -Freewheel Stator Torque Converter | 1 |
224-2989 Protection Ar-Corrosion -Custom
| 12***23 | Bracket Assem. | 1 |
| 18***66 | Bracket As | 1 |
| 18***04 | Plate Assem. | 1 |
Operator Station
200-7502 Air Conditioner Ar -Custom
| 11***93 | Plate; (Instruction) (On Right Side Behind Cab Door) | 1 |
| 18***64 | Lines Group-Air Conditioner | 1 |
| 20***25 | Wiring Group-Air Conditioner | 1 |
200-7503 Air Conditioner Gp -Custom
| 18***93 | Heater Group-Cab | 1 |
| 19***21 | Lines Group-Air Conditioner | 1 |
| 20***03 | Air Conditioner Group; -Custom | 1 |
163-0872 Compressor Gp-Refrigerant
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 11***69 | Valve Group-Relief; (Refrigerant Compressor) | 1 |
| 16***72 | Compressor Group-Refrigerant; -Air Conditioner | 1 |
216-9818 Compressor Gp-Refrigerant
| 14***01 | Cover-Dust; (Rear) | 1 |
| 15***00 | Bolt; (M10x1.5x54.25-mm) | 1 |
| 16***72 | Compressor Group-Refrigerant; -Air Conditioner | 1 |
193-3121 Lines Gp-Air Conditioner
| 10***93 | Valve As | 1 |
| 10***94 | Gasket | 1 |
| 10***95 | Valve As | 1 |
224-3891 Lines Gp-Air Conditioner
| 10***81 | Clamp Assem. | 1 |
| 16***94 | Bracket | 1 |
| 1P***56 | Plate | 1 |
185-1564 Lines Gp-Air Conditioner
| 10***00 | Fitting As-Air Conditioner; (Quick Disconnect)(Refrigerant) | 2 |
| 10***81 | Clamp Assem. | 1 |
| 10***97 | Valve As; (Low Side) | 1 |
Power Train
190-3784 Control Gp-Transmission Hyd
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 1 |
| 11***26 | Sensor Group-Temperature; -Transmission Oil | 1 |
| 13***00 | Clip; (Tab) | 4 |
157-0955 Gear Gp-Output Transfer
| 11***53 | Tube Assem. | 1 |
| 11***27 | Cage-Bearing | 1 |
| 11***26 | Yoke Assem. | 1 |
114-8947 Gear Gp-Output Transfer
| 10***12 | Drum | 1 |
| 11***53 | Tube Assem. | 1 |
| 11***47 | Gear Group-Output Transfer | 1 |
186-2522 Planetary Gp-Transmission
| 03***60 | Ring-Retaining | 3 |
| 11***50 | Piston-Clutch | 5 |
| 11***52 | Plate | 1 |
186-2523 Planetary Gp-Transmission
| 03***60 | Ring-Retaining | 3 |
| 11***50 | Piston-Clutch | 5 |
| 11***52 | Plate | 1 |
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 |
174-0058 Torque Converter & Housing Gp
| 11***21 | Flange-Pump Drive | 1 |
| 11***43 | Housing-Torque Converter | 1 |
| 13***49 | Gear-Pump Drive; (79-Teeth)(79 Teeth) | 1 |
168-5223 Torque Converter Gp
| 06***43 | Ring-Snap | 1 |
| 11***23 | Shaft-Output | 1 |
| 12***80 | Ball Bearing | 1 |
190-3776 Transmission Ar
| 11***47 | Gear Group-Output Transfer | 1 |
| 13***20 | Pump Group-Transmission | 1 |
| 17***58 | Torque Converter & Housing Group; -Freewheel Stator Torque Converter | 1 |
191-2351 Transmission Ar
| 13***20 | Pump Group-Transmission | 1 |
| 15***55 | Gear Group-Output Transfer | 1 |
| 17***58 | Torque Converter & Housing Group; -Freewheel Stator Torque Converter | 1 |
229-1940 Transmission Ar -Custom
| 13***09 | Tube-Heat Shrink; (32-mm Dia)(16-cm) | 0 |
| 13***10 | Tube; (12-cm) | 0 |
| 15***40 | Grease-Dielectric | 1 |
233-7856 Transmission Ar -Custom
| 13***09 | Tube-Heat Shrink; (32-mm Dia)(16-cm) | 0 |
| 13***10 | Tube; (12-cm) | 0 |
| 15***40 | Grease-Dielectric | 1 |
160-8408 Valve Gp-Modulating -Transmission Clutch
| 14***44 | Coil Assem. | 1 |
| 16***08 | Valve Group-Modulating; -Torque Converter Lockup Clutch | 1 |
| 16***08 | Washer; (13.03x25.4x2.38-mm Thk) | 1 |
202-8933 Valve Gp-Relief -Transmission Hydraulic Control
| 11***00 | Body | 1 |
| 1M***51 | Spring-Steering Clutch | 1 |
| 20***05 | Cover | 1 |
Service Equipment And Supplies
197-9986 Plate & Film Gp -Custom
| 13***59 | Plate-Identification; (Engine Stop, Run) | 1 |
| 18***52 | Plate-Hood; (Hood) | 1 |
| 19***86 | Plate & Film Group; -Custom | 1 |
Steering System
201-8110 Lines Gp-Secondary Steering
| 14***97 | Valve Group-Secondary Steering | 1 |
| 14***06 | Hose Assem. | 1 |
| 14***09 | Hose Assem. | 1 |
202-1067 Pump & Motor Gp-Sec Steering
| 11***68 | Gasket | 1 |
| 18***65 | Kit-Service; (Secondary Steering Pump) | 1 |
| 18***67 | Motor Group-Electric; (Secondary Steering) | 1 |
229-1999 Pump & Mtg Gp-Secondary Steer -Custom
| 10***01 | Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge) | 1 |
| 10***11 | Cable Assem. | 1 |
| 15***60 | Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness) | 2 |
201-8109 Pump & Mtg Gp-Secondary Steer
| 14***17 | Angle | 1 |
| 20***09 | Pump & Mtg Group-Secondary Steer | 1 |
| 20***86 | Bracket | 1 |
230-0867 Steering Ar-Secondary -Custom
| 10***11 | Cable Assem. | 1 |
| 19***00 | Wiring Group-Secondary Steering | 1 |
| 19***01 | Harness Assembly-Secondary Steering | 1 |
141-2597 Valve Gp-Secondary Steering
| 10***10 | Valve-Check; (Steering) | 2 |
| 10***11 | Plug; (5/16-12 Thd) | 2 |
| 14***97 | Valve Group-Secondary Steering | 1 |
950G II serial number reference
The PIN plate on a 950G II is mounted on the left-hand (highway/curb) side of the loader's front frame, near the front wheel and forward of the operator's station; a duplicate identification film may also be present nearby. The plate shows a 17-character Product Identification Number - the first 3 letters are the serial prefix (identifies the model/configuration block), followed by a numeric sequence number unique to that machine.
| Prefix | Identifies | Notes |
|---|---|---|
| AXX | 950G II wheel loader, base North American configuration | 3126B diesel engine. Part of the standard Pilot Hydraulics/HMU steering group; one of the earlier serial blocks issued for the Series II production run. |
| AYL | 950G II wheel loader, Swedish/European market-spec configuration, standard steering | 3126 engine. Covered under the Swedish-market plate and identification-film parts group. Standard (non-Command Control) Pilot Hydraulics/HMU steering. |
| AYB | 950G II wheel loader, Swedish/European market-spec configuration, Command Control steering | 3126B ATAAC engine. Covered under the Swedish-market plate and identification-film parts group. Electrohydraulic Command Control steering. |
| AYD | 950G II wheel loader, Command Control steering configuration | 3126B engine. Factory parts documentation tags this block specifically as the Command Control Steering machine. |
| AXR | 950G II wheel loader, Command Control steering configuration | 3126B engine. Electrohydraulic Command Control steering group; plate/film parts group carries no Swedish-market tag, unlike AYB. |
| AYS | 950G II wheel loader, standard Pilot Hydraulics/HMU steering configuration | 3126B engine. Standard (non-Command Control) hydraulic steering block, grouped with AXX/AYL/BAA under Pilot Hydraulics/HMU steering documentation, separate from the AXR/AYB/AYD Command Control group. |
| BAA | 950G II wheel loader, standard configuration | 3126B engine. A later serial block in the Series II run, part of the standard Pilot Hydraulics/HMU steering group; confirm exact options with dealer. |
| BMA | 950G II wheel loader (confirm with dealer) | Tied to the 950G II in factory parts documentation for a bounded serial span, but absent from broader Series II prefix summaries and from the steering-group documentation covering the other seven blocks. Engine and steering configuration not independently corroborated - confirm with dealer before relying on this prefix. |
Frequently asked questions
What engine powers the Caterpillar 950G II?
A Cat 3126B ATAAC diesel: an air-to-air aftercooled inline-six with ADEM III electronic control, rated at 136 kW (183 hp) net and certified to EPA Tier 2. It replaced the mechanically governed, Tier 1 3126 DITA used in the earlier plain 950G.
What is the operating weight of the Caterpillar 950G II?
About 17,780 kg (39,198 lb) in standard configuration. Weight varies by configuration - high-lift, waste handling, and forestry arrangements run heavier due to added counterweight, guarding, and boom geometry.
What replaced the Caterpillar 950G II?
The Cat 950H succeeded it as Caterpillar moved the medium wheel loader line to its next-generation platform, later followed by the 950K, 950M, and 950 GC updates.
What 950G II owners discuss
What do operators say about the 950G II's power shift transmission and on-demand fan under normal operation?
The transmission is a planetary power shift with proportional electro-hydraulic clutch valves and full auto or manual shift modes controlled by the power train ECM. Operators report brief shift busyness on light-to-heavy direction changes as normal, and the electronic on-demand fan running slower in cool weather and louder or faster once coolant or hydraulic oil temp climbs is expected, not a fault. Flags to act on: delayed or slipping gear engagement, the transmission running hot under load or on grade, or a heavy pull with weak response. Mechanics start with fluid level, filter condition, and the suction screen in the output transfer gear housing; visible metal in the screen points to clutch pack wear and a likely rebuild rather than a simple service.
Steering feels jerky or grabby on a 950-family loader. What's the usual troubleshooting order?
Jerky or grabby steering on this loader family is most often traced to worn linkage rather than the steering valve itself. The order mechanics report working through: grease every articulation and steering cylinder pin first, then check the follow-up linkage rod ends and steering box internals for play, and run a full hydraulic fluid and filter change if service history is unknown. Persistent jerk after that points to a worn signal lever in the steering box, a bent follow-up linkage, or on older units a sheared woodruff key on the pitman shaft. A loaded bucket amplifies any steering lag, so have your dealer verify articulation and steering valve response before returning the machine to full duty.
What wear patterns are typical for the 950G II compared to a tracked machine?
As a wheel-type loader, its highest-wear points are tires, the articulation joint, and the Z-bar or bucket linkage pins rather than track undercarriage. Owners grease linkage and articulation points roughly every 8 to 10 working hours, tightening that to about every 4 hours in wet, sandy, or quarry duty where contamination accelerates bushing wear. Tire pressure only a few psi off spec is enough to cause uneven tread wear, and quarry operators commonly fit tire protection chains to stretch tire life against cuts and abrasion. Articulation joint play is the one wear item to watch closely: excess play there means reduced steering control with a loaded bucket, so have your dealer verify joint bearing condition if you feel any looseness in the pivot.
How does the 950G II's engine differ from other loaders in the 950 series, and what's the known weak point?
Engine identity varies by production series and is a frequent source of confusion in parts and repair discussions. The 950G II carries the Cat 3126B ATAAC (air-to-air aftercooled), a Tier 2 engine run through an ADEM III electronic control module that also manages the on-demand fan and integrates with the power train ECM for coordinated power-shift response. The earlier plain 950G used the 3126 DITA, a Tier 1 unit without that level of electronic integration. Across the broader 3126 engine family, mechanics flag the HEUI fuel system as the component to watch: high-pressure oil pump or injector wear typically shows up first as marginal oil pressure or a hard, rough start, and contamination from a failing pump can take out injectors downstream. Confirm engine serial prefix against the ECM before assuming parts or calibration interchange with a plain 950G.
What electrical or sensor faults come up most often on the 950G II?
The most commonly discussed sensor fault on this platform is the lift lever position sensor failing calibration, typically flagged when the lever isn't centered at power-up; it clears with a recalibration run on the factory diagnostic tool. An implement pilot pressure supply solenoid fault often shows up alongside it and points to the same electro-hydraulic implement circuit. A stuck-on brake pressure warning light with a continuous alarm is usually a brake accumulator precharge issue; some owners report it clearing after the machine is driven and the accumulator cycles, but low precharge is a braking-performance issue, so have your dealer verify accumulator pressure rather than relying on it to self-correct. Instrument panel and coolant temp gauge misreads are frequently the gauge or panel itself rather than the actual cooling system; swapping the instrument panel is a comparatively cheap fix once the sender checks out good.
Why do some owners disable the intake air heater on the 950G II in hot climates?
In hot climates operators find the intake air starting-aid heater cycling on every cold start unnecessary and sometimes disable it, either through the power train ECM's service mode or by pulling power from the heater relay so the ECM sees an open circuit instead of a fault. This is a convenience adjustment rather than a defect and doesn't affect running performance once the engine is warm. Confirm the ECM software revision with your dealer before changing start-aid behavior so no other diagnostic logic is disrupted.
What should a buyer check on a used 950G II before making an offer?
Buyers focus on the same short list mechanics use for any medium wheel loader: cycle the articulation joint and check for play under load, since excess play there is the costliest hidden repair; inspect Z-bar and bucket pins and bushings for looseness and intact grease zerks; check tires and rims for sidewall cuts, cracks, and rim damage rather than just tread depth; look for cylinder and hose leaks at the lift and tilt circuits; and pull the ECM fault code history if a diagnostic tool is available, since repeat lift-sensor or implement-solenoid codes suggest deferred electrical maintenance. Ask for oil sample or analysis trends on the HEUI fuel and lube system if available, and check the transmission suction screen history for metal. Articulation and brake system condition both affect safe operation with a loaded bucket, so have your dealer verify both before purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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