Caterpillar IT62G
Maintenance schedule, common problems & OEM parts breakdown
The Cat IT62G is an integrated toolcarrier: a parallel-lift wheel loader built on the 950G-size chassis with a quick-coupler work-tool system that swaps buckets, pallet forks, and other attachments without a separate carrier vehicle. The base IT62G runs the Cat 3126 DITA, a 7.2-liter inline-six diesel with mechanical HEUI fuel injection, rated 149 kW (200 hp) net at 2200 rpm. Operating weight runs 17,506-18,314 kg (38,600-40,380 lb) depending on the work tool fitted. Cat built the IT62G roughly from 1997 to 2003, with serial prefixes running 6PS then AKP across the production run. Cat offered it with the full G-series work-tool line for this class: general-purpose and stockpile buckets, pallet forks including logging and lumber-fork variants, and other quick-coupler attachments, with command control (joystick) steering available alongside the standard wheel.
Cat updated the line partway through its life and again at the next full generation. The IT62G Series II moved to the 3126B with air-to-air aftercooling and a higher power rating for Tier 2 compliance, plus an electrically actuated quick coupler; the IT62H that followed switched to the electronic C7 ACERT engine entirely. None of that applies to the base IT62G covered here — it stays on the naturally turbocharged, mechanically governed 3126 DITA throughout its build. In the used and parts market today, the base IT62G is valued as a simple, pre-emissions-electronics toolcarrier: no aftertreatment and no engine ECM strategy to troubleshoot, with running gear shared with the higher-volume 950G/962G wheel loaders that keeps axle, transmission, and hydraulic parts easier to source than the toolcarrier-specific linkage and quick-coupler components. It remains a common sight in forestry yards, sawmills, and aggregate operations where the quick-change tool system earns its keep switching between forks and buckets in the same shift.
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 IT62G specifications
Engine
| Engine model | Cat 3126 DITA — six-cylinder, four-stroke, direct-injection, turbocharged and water-jacket aftercooled diesel |
| Gross (maximum flywheel) power | 154 kW (207 hp) at 1,950 rpm |
| Net (flywheel) power | 149 kW (200 hp) at 2,200 rpm |
| Displacement / bore x stroke | 7.2 L (439 in³); bore 110 mm x stroke 127 mm (4.3 x 5.0 in) |
| Peak torque | 917 N·m (674 lb-ft) at 1,400 rpm; total torque rise 41.2% |
| Emissions | Meets EU, US EPA, and Japan MOC exhaust emissions requirements in effect at time of manufacture (no specific tier level published) |
| Later-generation note | The later IT62G Series II toolcarrier carries the same 3126 engine family at a revised rating — net 152 kW (204 hp), maximum 157 kW (210 hp). The figures above apply to the original IT62G only; do not blend the two. |
Weights
| Operating weight — material handling bucket, 3.1 m³ (4.0 yd³) | 18,284 kg (40,310 lb) |
| Operating weight — material handling bucket, 3.3 m³ (4.25 yd³) | 18,314 kg (40,380 lb) |
| Operating weight — pallet fork configuration | 17,663 kg (38,940 lb) |
| Operating weight — material handling arm configuration | 17,506 kg (38,600 lb) |
| Static tipping load, straight (material handling bucket) | 12,961–13,014 kg (28,580–28,690 lb), varies by bucket size |
| Static tipping load, full 40° turn (material handling bucket) | 11,226–11,288 kg (24,750–24,890 lb), varies by bucket size |
| Static tipping load, pallet forks (610 mm/24 in load center) | 8,928 kg (19,680 lb) straight; 7,753 kg (17,090 lb) full 40° turn |
| Ground pressure | Not published in factory literature for this model |
Dimensions
| Overall length, bucket on ground (material handling bucket) | 8,265 mm (27 ft 1 in) |
| Overall length, pallet-fork configuration | 8,755 mm (28 ft 9 in) |
| Width over tires (standard 23.5-R25 XHA L-3) | 2,890 mm (9 ft 6 in / 114 in) |
| Height to top of cab | 3,375 mm (11 ft 1 in) |
| Overall height, bucket at full raise | 5,435–5,485 mm (17 ft 10 in–18 ft 0 in), varies by bucket size |
| Wheelbase | 3,350 mm (11 ft 0 in) |
| Ground clearance (standard tires) | 400 mm (1 ft 4 in) |
| Minimum turning radius, over tire | 6,025 mm (19 ft 9 in) |
| Loader clearance circle, bucket in carry position | 13,385–13,410 mm (43 ft 11 in–44 ft 0 in) |
| Digging depth | 90 mm (3.5 in) |
Performance
| Maximum forward travel speed (4th gear) | 37.0 km/h (23.0 mph) |
| Maximum reverse travel speed (4th gear) | 40.5 km/h (25.3 mph) |
| Breakout force | 125.5–130.3 kN (28,210–29,280 lb), varies by bucket size |
| Hydraulic cycle time (raise / dump / lower-float / total) | 6.1 s / 2.1 s / 2.8 s / 11.0 s total |
| Steering articulation angle | 40° each direction, center-point articulated frame |
| Rear axle oscillation / max single-wheel rise and fall | ±13° oscillation; 470 mm (19 in) max single-wheel rise and fall |
Service capacities (summary)
| Fuel tank | 295 L (78 gal) |
| Hydraulic system, including tank | 153 L (40.4 gal) |
| Engine oil (crankcase) | 30 L (7.9 gal) |
| Cooling system | 49 L (12.9 gal) |
| Transmission | 34 L (9.0 gal) |
| Differentials and final drives, front and rear (each) | 36 L (9.5 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
IT62G fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 29.9 L (7.9 US gal) | Cat DEO or DEO-ULS diesel engine oil. Multigrade SAE 15W-40 covers most ambient ranges; switch to SAE 10W-30 in cold climates for easier starting and quicker post-start circulation. Match viscosity grade to expected ambient temperature at the time of oil change, per the machine fluids chart. |
| Cooling system | 48.8 L (12.9 US gal) | Cat ELC (Extended Life Coolant/Antifreeze) premixed or concentrate, or a heavy-duty antifreeze meeting Cat's coolant specification if ELC is unavailable. Maintain proper glycol/water ratio for the expected minimum ambient temperature; do not mix coolant types. |
| Fuel tank | 295.2 L (78.0 US gal) | No. 2-D diesel fuel (ultra-low sulfur where required); No. 1-D or a winter-blend diesel in cold ambient conditions to prevent fuel gelling/waxing. |
| Transmission (powershift) | 34.1 L (9.0 US gal) | Cat TDTO (Transmission/Drive Train Oil). SAE 30 is the typical grade for moderate ambient temperatures; step down to SAE 10W in cold climates and up to SAE 50 in sustained high heat, per the ambient-temperature guide. |
| Final drive/differential, front axle | 36.0 L (9.5 US gal) | Cat TDTO, same grade selection logic as the transmission (SAE 10W/30/50 by ambient temperature). |
| Final drive/differential, rear axle | 36.0 L (9.5 US gal) | Cat TDTO, same grade selection logic as the transmission (SAE 10W/30/50 by ambient temperature). |
| Hydraulic tank (refill only) | 87.8 L (23.2 US gal) | Cat HYDO or HYDO Advanced hydraulic oil. SAE 10W is common for general service; move to a heavier grade (SAE 30) in hot ambient conditions if a higher-viscosity hydraulic oil is called for. |
| Hydraulic system, total (including tank) | 152.9 L (40.4 US gal) | Cat HYDO or HYDO Advanced hydraulic oil, viscosity grade selected by ambient temperature as above. |
| Grease (all lubrication points) | Per lube point, not a system fill | Cat Multipurpose Grease (NLGI 2) for general chassis, bucket/tool-linkage, and pin joints. Use Cat grease with added moly for heavily shock-loaded pins (loader linkage, bucket/coupler pivots); soft NLGI 1 or 0 grease in very cold climates for pumpability. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar IT62G maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 6,000 h |
|
Servicing the IT62G beyond the schedule
Predictive Maintenance & Fluid Analysis
Sample the 3126 DITA's engine oil every 250 hours; the mechanical HEUI system hides wear until it fails as hard starting or low power, so trending iron and soot counts catches pump and injector wear early. Sample transmission and axle oil every 500 hours, and hydraulic oil on the same interval — the toolcarrier's quick-coupler cylinders and parallel-lift linkage cycle harder than a standard loader's. Watch coolant sample trends too if the machine still runs conventional coolant instead of ELC.
Corrective & Common Repairs
Most engine complaints on the 3126 DITA trace back to the HEUI high-pressure oil pump or injector O-rings, not the injectors themselves — hard starting, rough idle, and surging point there first. On the chassis, check the quick-coupler locking pins and work-tool cylinders for play since constant attachment swaps wear these faster than a fixed-bucket loader. Command control steering units, where fitted, can develop pilot oil screen contamination; clean or replace the screen if steering response gets soft or delayed.
Overhaul & Rebuild Points
At major overhaul, inspect the parallel-lift linkage pins and bushings along with the loader and tilt cylinders — these carry more load-cycling than a standard bucket loader because of the quick-coupler's attachment versatility. Rebuild the HEUI pump and injectors as a set rather than piecemeal; mixed wear levels cause uneven fueling. On the drivetrain, plan differential, final drive, and articulation hitch bearing inspection together at 2000-hour-plus rebuilds since all three share the oscillating rear axle's duty cycle.
Seasonal & Environment Servicing
Cold-climate starts on the 3126 DITA benefit from block heaters and correctly rated engine oil, since the mechanical HEUI pump needs adequate oil pressure to actuate the injectors before combustion begins. In dusty forestry or aggregate settings, service the primary and cab air filters ahead of the standard interval and inspect the radiator core for pack-in between fins. Wet or muddy sites accelerate wear on articulation and axle oscillation bearings — grease them ahead of schedule, not after.
IT62G fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 164-11 | Injection Actuation Pressure system fault, no valid signal or reading out of range | Engine control module not receiving a usable signal from the HEUI injection actuation pressure circuit; typically a failed pressure sensor, damaged sensor wiring/connector, or a bad Injection Actuation Pressure Control Valve on the high-pressure oil pump | Check the sensor connector and wiring for corrosion or damage, then verify sensor supply voltage before condemning the IAPCV or high-pressure oil pump |
| 164-2 | Injection Actuation Pressure signal erratic, intermittent, or incorrect | Erratic HEUI system pressure reading from a failing Injection Actuation Pressure Control Valve, a worn high-pressure oil pump, a leaking injector, or a faulty pressure sensor; low engine oil level can also trigger it | Check engine oil level and condition first, then test the pressure sensor and control valve before replacing the high-pressure oil pump |
| 190-8 | Engine speed/timing sensor generating an abnormal frequency, pulse width, or signal pattern | Incorrect air gap between the speed/timing sensor and the tone ring, a damaged tone ring tooth, or a corroded sensor connector | Check and reset the sensor air gap with a feeler gauge and inspect the connector before replacing the sensor |
| 100-3 | Engine oil pressure sensor circuit voltage above normal, or signal invalid | Faulty or miswired oil pressure sensor sending an incorrect signal to the ECM, a bad ground, or damaged sensor wiring; actual oil pressure is often still within range | Confirm actual oil pressure with a mechanical gauge, then check sensor wiring and connector before replacing the sensor |
| 111-1 (FMI suffix varies by ECM software; also seen as 111-11 or 111-18) | Low coolant level warning | Coolant level below the probe in the radiator top tank or recovery system, a fouled coolant level probe, a wiring fault between probe and ECM, or a failed level sensor | Check and top off coolant, then clean the level probe before replacing the sensor if the warning persists |
| 110-0 (high coolant temperature warning; 110-3 is the sensor-circuit variant) | Engine coolant temperature above the normal operating range, or a coolant temperature sensor circuit fault | Low coolant level, a restricted or dirty radiator, a failed water temperature regulator, a cooling fan or fan drive issue, excessive load, or a faulty coolant temperature sensor/wiring | Check coolant level and radiator condition first, then verify the sensor reading against a manual temperature check before replacing the sensor |
| 168-2 (intermittent) / 168-4 (low voltage) | ECM battery/system voltage fault: intermittent power supply or voltage below normal | Loose or corroded battery cable and ground connections, a weak or failing battery, or low alternator charging output | Check battery voltage and terminal connections first, then verify charging system output before chasing ECM wiring |
| 105-3 / 105-4 | Intake manifold (air inlet) temperature sensor circuit voltage high, or a short circuit | A failed intake manifold air temperature sensor, or damaged/shorted sensor wiring | Inspect sensor wiring and the connector for damage or corrosion, then test the sensor and replace it if out of specification |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
IT62G attachments & work tools
General-purpose and light-material buckets
Standard bucket range for this size class runs about 3.1-3.3 m³ (4.0-4.25 yd³) heaped, with struck capacity near 2.7 m³ (3.5 yd³). Lighter-density buckets (light-material and sand-and-gravel versions) are offered for high-volume, low-density loads.
Multi-purpose and high/side-dump buckets
A clamshell-style multi-purpose bucket adds grading, clamping, and light dozing to straight digging duty. High-dump and side-dump bucket variants are offered for loading over high sideboards or dumping to the side in tight yards, plus a refuse-handling bucket for waste sites.
Pallet forks and material handling arms
Pallet forks, available in multiple tine lengths, and material handling arms cover palletized and irregular loads. The toolcarrier's parallel-lift linkage keeps forks level through the full lift cycle so the operator does not have to correct fork angle while raising or lowering.
Log and lumber forks
Log loading forks with an integrated grapple, plus lumber/log forks offered with or without clamps, support forestry and lumberyard handling. These mount through the same front coupler as the bucket line.
Hydraulic broom and snow plow
A hydraulic broom (sweeper) and a snow plow blade round out the factory work-tool line for yard cleanup and snow removal. The broom draws off the machine's auxiliary hydraulic circuit rather than running passively.
Quick coupler / mounting system
Work tools mount through a hydraulic quick coupler that lets most tools be swapped in under 30 seconds without leaving the cab. This coupler is documented as standard and electrically actuated on the later IT62G II refresh; base IT62G units in the field are also commonly fitted with a hydraulic bucket coupler.
Auxiliary hydraulics and hydraulic-kit notes
Powered tools such as the broom or a grapple attachment need the machine's auxiliary hydraulic circuit piped to the coupler. Pilot-assisted implement controls give one adjustable lift kickout and a two-position return-to-dig setting so the operator can favor either of two different tools.
Self-leveling parallel-lift linkage
An 8-bar loader linkage provides parallel lift through the full range of travel, the core feature separating this toolcarrier from a standard Z-bar wheel loader on the same size-class chassis. It keeps buckets and forks level automatically as the lift arms raise, which is what makes fork and grapple work practical on this machine.
Factory-installed work-tool program and options
Caterpillar lists these attachments as factory-installed work tools rather than aftermarket-only fitments. Optional automatic ride control smooths travel when carrying a loaded bucket or forks, and electronic autoshift and a cold-weather air-intake heater are other factory options; exact tool and hydraulic-kit availability varies by configuration and production year.
All IT62G assemblies by section
Every catalogued assembly group for the Caterpillar IT62G. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Operator Station
3e-1906 Compressor Gp-Refrigerant
| 3E***06 | Compressor Group-Refrigerant | 1 |
| 7T***32 | Plug Assem.; (3/8-24) | 1 |
| 9X***85 | Seal-O-Ring (20.22mm Id) | 2 |
106-5122 Compressor Gp-Refrigerant
| 10***22 | Compressor Group-Refrigerant; -Air Conditioner | 1 |
| 7T***32 | Plug Assem.; (3/8-24) | 1 |
| 9X***85 | Seal-O-Ring (20.22mm Id) | 2 |
2q-7918 Kit-Air Conditioner -Custom
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***22 | Compressor Group-Refrigerant; -Air Conditioner | 1 |
| 10***04 | Suppressor As-Arc | 1 |
2q-8256 Kit-Air Conditioner -Custom
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***00 | Fitting As-Air Conditioner; (Quick Disconnect)(Refrigerant) | 2 |
2q-8254 Kit-Air Conditioner -Custom
| 10***00 | Fitting As-Air Conditioner; (Quick Disconnect)(Refrigerant) | 2 |
| 10***81 | Clamp Assem. | 1 |
| 10***22 | Compressor Group-Refrigerant; -Air Conditioner | 1 |
2q-8253 Kit-Air Conditioner -Custom
| 06***93 | Grommet; (Rh) | 1 |
| 10***93 | Valve As | 1 |
| 10***94 | Gasket | 1 |
IT62G serial number reference
The serial/PIN plate on the IT62G sits on the left-hand (highway) side of the machine, behind the front tire. On machines built before 2001 the number is 8 characters: a 3-letter prefix followed by a 5-digit sequence (example 6PS00357). On 2001-and-later production the number is the full 17-character PIN combining CAT, the model code, a single check/plant letter, the 3-letter prefix, and the 5-digit sequence (example CATIT62GVAKP00535); this same number is also stamped into the frame near the plate. Read the prefix as the 3 letters directly before the trailing 5-digit sequence.
| Prefix | Identifies | Notes |
|---|---|---|
| 6PS | IT62G Integrated Toolcarrier (first-generation, not IT62G II) | Earliest confirmed production block. A sold unit with this exact prefix carries a 1998 model year; exact introduction date is not independently confirmed beyond that. Powered by the Cat 3126 engine. Uses the pre-2001 8-character serial format (3-letter prefix plus 5-digit sequence). |
| AKP | IT62G Integrated Toolcarrier (first-generation, not IT62G II) | Later production block of the same base IT62G, seen on machines sold new around 2003. Powered by the Cat 3126 engine. Appears in the full 17-character PIN format (CAT + model code + a single check/plant letter + AKP + 5-digit sequence). |
Frequently asked questions
What engine does the Caterpillar IT62G use?
The base IT62G runs the Cat 3126 DITA, a 7.2-liter inline-six diesel with mechanical HEUI fuel injection, rated 149 kW (200 hp) net at 2200 rpm. Later IT62G Series II units switched to the aftercooled 3126B at a higher rating — don't confuse the two when sourcing engine parts.
What is the operating weight of the Caterpillar IT62G?
Operating weight runs 17,506-18,314 kg (38,600-40,380 lb), varying by which work tool is fitted — a bucket, pallet forks, or another quick-coupler attachment shifts the figure.
What replaced the Caterpillar IT62G?
Cat updated it in place first with the IT62G Series II (3126B engine, higher rating, electric quick coupler), then replaced the line outright with the IT62H, which moved to the electronic C7 ACERT engine.
What IT62G owners discuss
What engine does the IT62G actually run, and does that matter for parts and service?
What are the most common 3126 DITA complaints owners report on this machine?
Is the powertrain/transmission a known weak point?
What linkage and coupler wear is specific to it being a toolcarrier rather than a straight loader?
What about ride control and general hydraulics?
What electrical or sensor issues come up most?
What should I check before buying a used IT62G?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific IT62G part?
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