Caterpillarintegrated toolcarrier(no series)

Caterpillar IT12B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar IT12B is a compact integrated tool carrier designed for utility, municipal, and construction applications. It is powered by a Cat 3114 diesel engine delivering 75 net horsepower. The machine has an operating weight of 17,526.8 lb (7,949 kg) and a bucket capacity of 1.6 yd³ (1.2 m³). Production years for the IT12B span from approximately 1990 to 2025, covering multiple serial number prefixes including 9SF, 3NJ, and 1KF. It succeeded earlier IT12 models and was followed by the IT14G series. Configurations offered include standard and extended hook heights, fork attachments, and various tire options.

Across generations, the IT12B evolved from mechanical controls to electronic powershift transmissions and improved hydraulic systems. The transition to the IT14G series introduced higher horsepower and larger bucket capacities for heavier duty cycles. The IT12B remains significant in the used and parts market due to its widespread use in municipal fleets and the availability of robust replacement components for its Cat 3114 engine and transmission. Its compact size and versatility ensure continued demand for service parts and reliable used units.

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 IT12B specifications

Engine

Engine Model3114
Gross Power81 hp (60.5 kW) @ 2400 rpm
Net Power75 hp (56 kW) @ 2400 rpm
Displacement268.6 cu in (4.4 L)

Weights

Operating Weight17526.8 lb (7950 kg)

Dimensions

Transport Length (with bucket on ground)20.54 ft (6259 mm)
Transport Length (without forks)21.84 ft (6656 mm)
Transport Height (to top of cab)9.83 ft (2996 mm)
Wheelbase7.67 ft (2337 mm)
Ground Clearance1.13 ft (343.4 mm)
Hinge Pin Max Height11.92 ft (3632 mm)
Max Lift Height11.59 ft (3532 mm)
Dump Clearance at Max Lift8.99 ft (2740 mm)
Hook Height at Max Lift (standard)19.21 ft (5854 mm)
Hook Height at Max Lift (extended)21.96 ft (6691 mm)
Hook Reach at Max Lift (standard)6.63 ft (2019 mm)
Hook Reach at Max Lift (extended)8.43 ft (2567 mm)
Reach at Max Height and Dump3.01 ft (917 mm)

Performance

Max Speed Forward22.4 mph (36 km/h)
Max Speed Reverse15 mph (24 km/h)
Static Tipping Load (bucket)9748.9 lb (4422 kg)
Static Tipping Load (forks)7826.5 lb (3550 kg)
Static Tipping Load (material handler)4418.1 lb (2004 kg)
Bucket Breakout Force13583 lb (60.5 kN)

Service capacities (summary)

Fuel Tank Capacity25.7 gal (97 L)
Hydraulic System Fluid Capacity17.7 gal (67 L)
Engine Oil Capacity3 gal (11 L)
Cooling System Fluid Capacity8 gal (30 L)
Transmission Fluid Capacity6.1 gal (23 L)
Front Diff Fluid Capacity4.8 gal (18 L)
Rear Diff Fluid Capacity4.8 gal (18 L)

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

Caterpillar IT12B maintenance schedule

Service intervalTasks
Every 10 h
  • Check engine oil level.
  • Check hydraulic fluid level.
  • Check coolant level.
  • Drain water from fuel separator.
  • Check air filter restriction indicator.
  • Inspect for fluid leaks.
Every 250 h
  • Change engine oil and filter.
  • Grease all pivot points.
  • Check fluid levels.
  • Perform visual inspection.
  • Service air filter.
  • Check belts and hoses.
Every 500 h
  • Replace fuel filter.
  • Replace hydraulic return filter.
  • Service battery.
  • Inspect undercarriage.
  • Test coolant.
  • Drain water separator.
Every 1,000 h
  • Sample hydraulic oil.
  • Service final drive oil.
  • Inspect turbocharger.
  • Torque ROPS bolts.
  • Measure wear components.
  • Clean/replace air filter element.
Every 2,000 h
  • Change hydraulic oil.
  • Flush coolant system.
  • Service transmission.
  • Inspect structural components.
  • Evaluate major components.
  • Replace worn belts and hoses.

Servicing the IT12B beyond the schedule

Predictive Maintenance & Fluid Analysis

Monitor engine oil, hydraulic fluid, and coolant through Scheduled Oil Sampling (S.O.S). Analyze wear metals and contamination levels to detect early signs of engine or hydraulic pump failure. Check coolant SCA concentration to prevent liner pitting. Inspect hydraulic oil for water content and viscosity changes. Use Cat DEO engine oil and Cat HYDO Advanced hydraulic fluid to maintain system integrity. Track fluid condition trends to optimize drain intervals and prevent costly component damage.

Corrective & Common Repairs

Address frequent issues with the Cat 3114 engine, including fuel injector leaks and turbocharger hot housing erosion. Replace worn hydraulic hoses and fittings to prevent pressure loss. Inspect the electronic powershift transmission for clutch wear and fluid contamination. Check the final drive and axle seals for leaks. Replace air filter elements regularly to prevent dust ingestion. Repair or replace worn bucket teeth and cutting edges to maintain digging force and efficiency.

Overhaul & Rebuild Points

Plan engine overhaul based on S.O.S analysis and hour accumulation, typically around 10,000-15,000 hours. Inspect cylinder liners, pistons, and bearings for wear. Rebuild the hydraulic pump and motor if flow or pressure drops below specifications. Service the transmission clutch packs and torque converter. Replace worn undercarriage components, including track shoes and sprockets, to prevent frame damage. Inspect the frame and boom for cracks or structural fatigue.

Seasonal & Environment Servicing

In cold weather, use Cat DEO-ULS Cold Weather oil and ensure coolant freeze protection. Check battery condition and charge level. In hot climates, monitor engine temperature and clean radiator fins daily. Use Cat HYDO Advanced oil optimized for high temperatures. In dusty environments, service the air filter more frequently and check the air filter restriction indicator. Inspect seals and gaskets for wear due to extreme temperatures or chemical exposure. Adjust maintenance intervals based on duty cycle and environmental conditions.

IT12B common service parts

Part numberPart
6V-7615Film-Identification-On Fuel FilterCheck fitment →
8C-8899Film-Identification-On Engine Oil FilterCheck fitment →
9X-6008Transmission FilterCheck fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

IT12B fault codes & troubleshooting

CodeMeaningLikely causeWhat to do
CID 0110 FMI 03Engine Coolant Temperature Sensor — Voltage Above NormalOpen circuit in sensor wiring, short to power, or failed sensor.Inspect wiring harness for damage; test sensor resistance; replace if faulty.
CID 0110 FMI 01Engine Coolant Temperature — Below Normal RangeLow coolant level, failed thermostat stuck open, or sensor error.Check coolant level; inspect for leaks; test thermostat operation.
CID 0190 FMI 08Engine Speed Sensor — Abnormal FrequencySpeed sensor air gap incorrect, sensor failure, or damaged tone ring.Check sensor gap; inspect tone ring for damage; test sensor signal.
CID 0041 FMI 038-Volt DC Supply — Voltage Above NormalShort to power on the 8V reference circuit shared by multiple sensors.Disconnect sensors one at a time to isolate the shorted component.
CID 0041 FMI 048-Volt DC Supply — Voltage Below NormalShort to ground on the 8V reference circuit.Disconnect sensors one at a time to locate the shorted circuit.
CID 0168 FMI 02System Voltage — Erratic/IntermittentLoose battery connections, failing alternator, or poor ground.Check battery terminals and ground straps; test alternator output.
CID 0248 FMI 09CAT Data Link — Abnormal Update RateCAN bus wiring damage, poor connection, or termination fault.Inspect data link wiring for damage; check connector pins; measure termination.
CID 0091 FMI 02Throttle Position Sensor — Erratic/IntermittentWorn throttle sensor, loose wiring, or poor connection.Inspect throttle linkage and sensor wiring; test sensor signal consistency.
CID 0100 FMI 01Engine Oil Pressure — Below Normal RangeLow oil level, failing oil pump, or clogged filter.Check oil level immediately; inspect for leaks; verify oil pressure with gauge.
CID 0174 FMI 03Engine Fuel Temperature Sensor — Voltage Above NormalOpen circuit in sensor wiring or failed sensor.Inspect harness for breaks; test sensor resistance; replace if necessary.

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

IT12B attachments & work tools

Standard Buckets

The IT12B is equipped with a standard bucket having a struck capacity of 1.4 cubic meters (1.4 cubic yards) and a heaped capacity of 1.6 cubic meters (1.6 cubic yards). The bucket width measures 2.41 meters (7.9 feet). Breakout force is rated at 6160 kilograms (13583 pounds).

Fork Attachments

Standard fork tines measure 1.22 meters (4 feet) in length. The machine supports hook heights of 5.85 meters (19.21 feet) for the standard configuration and 6.70 meters (21.96 feet) for the extended configuration. Static tipping load with forks is 3550 kilograms (7826.5 pounds).

Hydraulic System

The hydraulic system utilizes a pump flow capacity of 112 liters per minute (29.6 gallons per minute) with a relief valve setting of 15.2 megapascals (2204 psi). The system fluid capacity is 67 liters (17.7 gallons). Cat HYDO Advanced hydraulic oil is the recommended fluid specification.

Engine and Power

The IT12B uses a Cat 3114 engine with a displacement of 4.4 liters (268.6 cubic inches). Gross power is 60 kilowatts (81 horsepower) and net power is 56 kilowatts (75 horsepower) at 2400 rpm. Engine oil capacity is 11.4 liters (3 gallons).

Transmission and Drivetrain

The machine features an electronic powershift transmission with 4 forward gears and 3 reverse gears. Maximum forward speed is 36.0 kilometers per hour (22.4 miles per hour) and maximum reverse speed is 24.1 kilometers per hour (15 miles per hour). Transmission fluid capacity is 23.1 liters (6.1 gallons).

Dimensions and Weight

Operating weight is 7950 kilograms (17526.8 pounds). Length with bucket on ground is 6.26 meters (20.54 feet). Height to top of cab is 2.99 meters (9.83 feet). Wheelbase is 2.34 meters (7.67 feet). Ground clearance is 0.34 meters (1.13 feet).

All IT12B assemblies by section

Every catalogued assembly group for the Caterpillar IT12B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Air Inlet And Exhaust System
7c5519 Air Cleaner Gp
7c5518 Air Cleaner Gp
7c2290 Cover Gp-Inlet Manifold
7C***90Cover Group-Inlet Manifold; Inlet Manifold Cover Group1
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7e0831 Exhaust Extension Gp
7c3582 Lines Gp-Air
7c5522 Lines Gp-Air
7c3581 Lines Gp-Turbocharger Oil
7c3580 Manifold Gp-Exhaust
4w5362 Manifold Gp-Inlet
4y5207 Muffler Gp
7c5525 Muffler Gp
4m0310 Precleaner As
9y6592 Turbocharger Gp
Basic Engine
7e3686 Balancer Gp
4w4865 Camshaft Gp-Single
4W***65Camshaft Group-Single; (Single)1
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4w3462 Carrier Gp-Seal
4W***62Carrier Group-Seal; Carrier Group (Seal)1
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1w8897 Cover Gp-Cylinder Block
1W***97Cover Group-Cylinder Block; Cylinder Block Cover Group1
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7w9847 Cover Gp-Front
9y8046 Cover Gp-Valve-Sound Suppression
9Y***46Cover Group-Sound Suppression; Cover Gp-Valve-Sound Suppression1
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7w7337 Cover Gp-Valve Mechanism
7W***37Cover Group-Valve Mechanism; Valve Mechanism Cover Group1
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4w3579 Crankshaft Gp
4W***79Crankshaft Group; Crankshaft Group1
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7e5311 Cylinder Block Gp
4w3724 Cylinder Block Gp
4W***24Cylinder Block Group; Cylinder Block Group1
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7w5664 Cylinder Head As
9y6164 Cylinder Head As*R
9y8872 Cylinder Head Gp
9Y***72Cylinder Head Group; Cylinder Head Group1
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9y8849 Cylinder Head Gp*R
7c0044 Drive Gp-Fan
7C***44Drive Group-Fan; Fan Drive Group1
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9y9511 Flywheel Gp
7e3756 Gear Gp-Front
7E***56Gear Group-Front; Front Gear Group1
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7e8774 Housing Gp-Flywheel
7E***74Housing Group-Flywheel; Flywheel Housing Group1
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7w8813 Housing Gp-Flywheel
7l0002 Housing Gp-Front
4w2515 Lifting Gp-Engine
4w4866 Fuel Pump & Valve Mechanism Gp
4W***66Mechanism Group-Fuel Pump & Valve1
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7c5524 Mounting Gp-Engine
4w3652 Rod & Piston Gp
7c4479 Piston Gp
9y4914 Pulley Gp-Crankshaft
7e5213 Ring Gp-Piston
10***87Ring-Piston (Top-Chrome)1
7C***32Ring-Piston; (Oil Regulating)1
7E***13Ring Group-Piston1
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7c6077 Rocker Arm Gp-Valve
1154120 Seal Gp-Crankshaft
7e7590 Seal Gp-Crankshaft
7E***90Seal Group-Crankshaft; Crankshaft Seal Group1
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7c1770 Seal Gp-Flywheel Housing
Cab, Gauges And Accessories
3t7063 Wiper Gp-Front
7x1982 Wiper Gp
7X***82Wiper Group; Wiper Group (Robert Bosch)1
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7x1983 Wiper Gp
7X***83Wiper Group; Wiper Group (Nippondenso)1
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6w8505 Adjuster Gp-Seat
6W***05Adjuster Group-Seat; -Suspension1
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8c6220 Air Conditioner & Mounting Gp
8C***20Air Conditioner & Mounting Group1
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8t9866 Air Conditioner Gp
4y4240 Canopy Gp-Soft
8t9761 Clutch & Refrigerant Compressor Gp
8T***61Compressor Group-Clutch & Refrig1
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7c5538 Compressor Gp-Refrigerant
8r7784 Mounting & Condenser Gp
9x3450 Condenser Gp
3w8011 Dash Gp
8r1836 Door Gp
3w0811 Duct Gp-Control
8r4198 Gauge Gp
9x5715 Gauge Gp-Cluster
8r4151 Guard Gp-Vandalism
8r6747 Heater & Air Conditioner Ar
3W***56Lines Group-Air Conditioner1
7C***38Compressor Group-Refrigerant1
8C***20Air Conditioner & Mounting Group1
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8c6219 Heater & Mounting Gp
8C***19Heater & Mounting Group; Mounting & Heater Gp1
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3w8053 Heater Ar-Cab
3W***11Duct & Control Group1
3W***13Lines Group-Heater1
3W***53Heater Ar-Cab1
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3w0812 Heater Gp-Cab
3w8056 Lines Gp-Air Conditioner
3w0813 Lines Gp-Heater
8r4659 Lock Gp-Vandalism
5P***00Key Total 2 Pieces Per Unit; (Literature Compartment)2
5P***02Padlock Group; (Includes: Battery Compartments, Platform Compartments, Radiator Access Door, Firewall Doors)7
6V***74Cover-Padlock (Not Part Of This Group)8
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5g7647 Mirror Gp
8r6760 Mirror Gp
9c8243 Mirror Gp
9C***43Mirror Group-Rear View; -Inside1
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4e0964 Mounting Gp-Rops
8r1133 Operator Ar-Canopy
3W***12Platform Group1
4E***81Plate2
4Y***40Canopy Group-Soft; Canopy Gp1
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8r1135 Operator Ar-Non Rops
1A***42Spacer-Jaw Lock3
3W***12Platform Group1
4E***81Plate2
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8r1134 Operator Ar-Open Rops
3W***12Platform Group1
4E***47Rops Group1
8R***34Operator Ar-Open Rops1
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6v6561 Pivot Gp-Wiper Arm
6V***61Pivot Group-Wiper Arm; (Wiper Arm)1
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8r3313 Roading Ar
5G***98Speedometer Group; Speedometer-Gp1
8R***12Lighting Group-Roading1
8R***13Roading Ar1
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4e1050 Rops Gp-Part 2 Of 3
4e1047 Rops Gp
4e1050 Rops Gp-Part 3 Of 3
4e1049 Rops Gp-Enclosed
4e1050 Rops Gp-Part 1 Of 3
9v8184 Seat Gp
8r5373 Seat Gp
8r5372 Seat Gp-Adjustable
8r3855 Seat Gp-Adjustable
5g7598 Speedometer Gp
5G***98Speedometer Group; Speedometer-Gp1
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9v7924 Suspension Gp-Seat-Part 2 Of 2
6w8502 Suspension Gp-Seat-Part 1 Of 2
9v7924 Suspension Gp-Seat-Part 1 Of 2
6w8502 Suspension Gp-Seat-Part 2 Of 2
8r1774 Bottle Gp-Windshield Washer
3w8048 Washer & Wiper Gp-Part 1 Of 2
3w8052 Washer & Wiper Gp
3T***55Switch As-Rotary (Wiper & Washer) (Each Includes)1
3T***64Wiper Group-Sensor1
3T***86Crank Assem.1
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3w8048 Washer & Wiper Gp-Part 2 Of 2
3t7064 Wiper Gp-Sensor
3T***64Wiper Group-Sensor1
7X***82Wiper Group; Wiper Group (Robert Bosch)1
7X***83Wiper Group; Wiper Group (Nippondenso)1
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Chassis
9c9135 Counterweight Gp
5g7640 Cover Gp-Hood & Guard
5g7582 Fender Gp-Part 1 Of 2
5g7582 Fender Gp-Part 2 Of 2
5g7581 Fender Gp
8r6229 Firewall Gp
3w0791 Firewall Gp
9c9571 Frame Gp-Engine End
9c6116 Frame Gp-Non Engine End
5g7331 Guard Gp-Bottom
4e4735 Guard Gp-Crankcase
3w8017 Hood & Guard Gp-Part 1 Of 2
3w8017 Hood & Guard Gp-Part 2 Of 2
3w9914 Ladder Gp
3w8012 Platform Gp
8r2483 Rim Gp-Demountable-4 Required
9c9186 Rim Gp-Demountable-4 Required
8r1148 Rim Gp-Demountable-4 Required
8r6697 Support Gp-Platform
8r6698 Support Gp-Platform
5g7646 Tool Box Gp
Cooling System
4w4869 Cooler Gp-Engine Oil
4W***69Cooler Group-Engine Oil; Engine Oil Cooler Group1
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8r3711 Cooler Gp-Hydraulic Oil
7c6998 Drive Gp-Water Pump
7C***98Drive Group-Water Pump; Water Pump Drive Group1
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7c5521 Fan Gp-Blower
9x3294 Heater Gp-Jacket Water
9x3293 Heater Gp-Jacket Water
3t8724 Heater Gp-Jacket Water
3w8034 Lines Gp-Torque Converter Cooler
9y7743 Lines Gp-Water
7c7030 Pump Gp-Water
7C***30Pump Group-Water; Water Pump Group1
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7c6438 Pump Gp-Water
9y6716 Radiator Gp
4y4611 Radiator Gp-C
7c5527 Radiator Gp
Engine Arrangement
7c3288 Engine Ar-Part 2 Of 2
1W***32Pan Group-Oil1
2T***51Valve Group-Fluid Sampling; Manual Valve Group (Fluid Sampling)1
4W***15Lifting Group1
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7c3288 Engine Ar-Part 1 Of 2
1N***76Filter Group-Fuel1
1N***77Breather Group; Breather Group1
1W***97Cover Group-Cylinder Block; Cylinder Block Cover Group1
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Fuel System And Governor
9s1932 Cover Gp
8c5663 Cable Gp-Parking Brake
7w8600 Control Gp-Fuel Injection
7W***00Control Group-Fuel Injection; Fuel Injection Control Group1
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7c5203 Control Gp-Governor
4p4775 Drive Gp-Governor & Transfer Pump
4P***75Drive Group-Gov & Transfer Pump1
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7w8179 Drive Gp-Governor & Transfer Pump
7W***79Drive Group-Gov & Transfer Pump1
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4p0666 Drive Gp-Governor & Transfer Pump
4P***66Drive Group-Gov & Transfer Pump1
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7w4812 Fastener Gp-Governor
7W***12Fastener Group-Governor; Fastener Group(Governor) (~1c K5811)1
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1n3476 Filter Gp-Fuel
7c4949 Filter Gp-Primary Fuel
7c6870 Governor Gp-Unit Injector
4p4778 Governor Gp-Unit Injector
4p4777 Governor Gp-Unit Injector
4p8727 Governor Gp-Unit Injector
4p1582 Governor Gp-Unit Injector
7c4022 Governor Gp-Unit Injector
4p5792 Governor Gp-Unit Injector
4P***92Governor Group-Unit Injector1
4P***27Governor Group-Unit Injector1
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8r1497 Installation Gp-Controls
4p5748 Kit-Governor
1T***68Seal-O-Ring; (Fuel Injection Pump)1
3J***07Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve2
3P***47Ring-Retaining1
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4p5751 Kit-Shaft
3w8020 Lines Gp-Fuel
7w9854 Lines Gp-Fuel Filter
7w8434 Lines Gp-Governor Oil
7W***34Lines Group-Governor Oil; Governor Oil Lines Group1
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9c9138 Pedal Gp-Governor
7e3423 Pump Gp-Fuel Injection
4e0750 Pump Gp-Fuel Priming
1P***36Gasket; (Fuel Priming Pump)(Fuel Priming Pump)1
3J***07Seal Valve Assembly To; Seal- Tube Assembly To Logic Valve3
4E***50Pump Group-Fuel Priming1
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4e2608 Pump Gp-Fuel Priming & Primary Filter
4E***08Pump Group-Fuel Prm & Prim Filter1
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3w8024 Tank Gp-Fuel
Hydraulic System
9g9288 Cover Gp-Protection
9G***88Protection Cover Group; -Hydraulic Tank-Steering Tank Fill Cap-Hydraulic Tank Fill Cap1
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8r8154 Control Gp-Hydraulic Hand
5g6990 Control Gp-Hydraulic Hand
8r8153 Control Gp-Hydraulic Hand
3w8037 Control Gp-Hydraulic Hand
5g7819 Cylinder & Mounting Gp
5g7664 Cylinder & Mounting Gp
9t5152 Cylinder Gp-Lift-2 Required (Chgs 00-04)
9t5729 Cylinder Gp-Pin Coupler (Chgs 00-01)
4t8579 Cylinder Gp-Pin Coupler (Chgs 00-03)
9t5151 Cylinder Gp-Tilt-2 Required (Chgs 00-01)
8r6221 Guard Gp-Hose
5g7000 Hydraulic Ar-4 Valve
4E***32Shaft1
5G***70Lines Group-Front1
5G***90Control Group-Hydraulic Hand1
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8r8156 Hydraulic Ar-4 Valve
4E***32Shaft1
5G***70Lines Group-Front1
6E***98Valve Group-Bank; Valve Gp-Bank 41
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8r4872 Hydraulic Ar-Check Valve-4 Valve
6E***00Valve Group-Bank; Valve Gp-Bank-41
8R***72Hydraulic Ar-Check Valve1
8R***22Lines Group-Check Valve1
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8r4870 Hydraulic Ar-Check Valve-3 Valve
6E***99Valve Group-Bank; Valve Gp-Bank 31
8R***70Hydraulic Ar-Check Valve1
8R***22Lines Group-Check Valve1
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8r9422 Lines Gp-Check Valve-Part 3 Of 3
8r9422 Lines Gp-Check Valve-Part 1 Of 3
8r9422 Lines Gp-Check Valve-Part 2 Of 3
3w9920 Lines Gp-Coupler
3w9921 Lines Gp-Front
5g6970 Lines Gp-Front
3w9922 Lines Gp-Lift Cylinder-Part 2 Of 2
3w9922 Lines Gp-Lift Cylinder-Part 1 Of 2
3w9923 Lines Gp-Pump-Part 2 Of 2
3w9923 Lines Gp-Pump-Part 1 Of 2
3w9924 Lines Gp-Tilt Cylinder-Part 2 Of 2
3w9924 Lines Gp-Tilt Cylinder-Part 1 Of 2
9t8919 Pump Gp-Gear
3w9925 Pump Gp-Gear
3w8042 Tank Gp-Hydraulic
1122240 Valve & Mounting Gp
11***40Valve & Mounting Group; -Blade Cushion1
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9t5629 Valve Gp-4 Bank
9t5628 Valve Gp-3 Bank
6e4198 Valve Gp- 4 Bank
6E***98Valve Group-Bank; Valve Gp-Bank 41
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6e4200 Valve Gp-Bank 4
6E***00Valve Group-Bank; Valve Gp-Bank-41
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6e4199 Valve Gp-Bank 3
6E***99Valve Group-Bank; Valve Gp-Bank 31
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6e4197 Valve Gp-Bank 3
8j9471 Valve Gp-Check & Relief-Lift Cylinder
8J***71Valve Group-Check; -Lift Cylinder Circuit1
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3w9926 Valve Gp-Control
9t5679 Valve Gp-Control
9t5682 Valve Gp-Control
9t5678 Valve Gp-Control
9t8880 Valve Gp-Control
6e4194 Valve Gp-Relief
9t5677 Valve Gp-Relief
9j0798 Valve Gp-Relief
4t7944 Valve Gp-Relief-Tilt
9t7263 Valve Gp-Relief
9t4739 Valve Gp-Sequence
1128210 Valve Gp-Solenoid
11***10Valve Group-Solenoid; (Pilot Pressure Supply)1
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Implements
9v1795 Arm Gp-Material Handling
3g4428 Bit & Cutting Edge Gp
9w8695 Bit & Cutting Edge Gp
5g8524 Bucket As
5g7599 Bucket As
9v8961 Bucket As-General Purpose
9v8958 Bucket As-General Purpose
9v8959 Bucket As-General Purpose
9v8960 Bucket As-General Purpose
6w8832 Carriage As-Fork
6W***32Carriage As-Fork; -Quick Coupler1
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8c9759 Control Gp-Electronic
8C***59Control Group-Electronic; (Bucket Positioner)1
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5g7329 Control Gp-Implement-Part 2 Of 2
5g7329 Control Gp-Implement-Part 1 Of 2
8c9763 Control Gp-Electronic
8C***63Control Group-Lift Kickout; (Lift Kickout)1
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5g7661 Quick Coupler Ar
5G***61Coupler Ar-Quick1
5G***62Coupler Group-Quick; Quick Coupler Gp1
5G***63Lines Group-Coupler1
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5g7330 Quick Coupler Gp
5g7662 Quick Coupler Gp
5G***62Coupler Group-Quick; Quick Coupler Gp1
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9w3486 Edge-Cutting
Edge-Cutting-Abrasion Resistant Material
9w3482 Edge-Cutting-Lh
9W***82Edge-Cutting-Lh; Cutting Edge-End-L.H.1
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9w3481 Edge-End-Rh
9W***81Edge-End-Rh; Cutting Edge-End-R.H.1
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6w9739 Fork Gp-Pallet
09***37Service Group-Fork Positioner1
6W***39Fork Group1
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6w8900 Fork Gp-Pallet
09***37Service Group-Fork Positioner1
6W***00Fork Group1
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6w8933 Fork Gp-Pallet
09***37Service Group-Fork Positioner1
6W***33Fork Group1
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8r1691 Positioner & Kickout Gp
5g7663 Lines Gp-Coupler
9j3169 Tip Gp-Long
9j3178 Tip Gp-Short
1u1528 Tooth Gp-Long
3g4017 Tooth Gp-Long
1u1527 Tooth Gp-Short
3g4018 Tooth Gp-Short
6e1521 Valve Gp-Ball
Lubrication System
1n3477 Breather Gp
9y8048 Cover Gp-Oil Pan-Sound Suppression
7e9027 Cover Gp-Sound Suppression-Oil Pan
7c4532 Drain Gp-Oil Pan
7C***32Drain Group-Oil Pan; Oil Pan Drain Group1
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7w8798 Filler Gp-Oil
7W***98Filler Group-Oil; Engine Oil Filler Group1
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7c0896 Filter Gp-Engine Oil
7C***96Filter Group-Engine Oil; Engine Oil Filter Group1
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4p1737 Fumes Disposal Gp
9y0325 Gauge Gp-Oil Level (Dipstick)
9Y***25Gauge Group-Oil Level (Dipstick)1
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7w8796 Gauge Gp-Oil Level (Dipstick)
7W***96Gauge Group-Oil Level (Dipstick)1
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7c0897 Lines Gp-Engine Oil
7c5873 Lines Gp-Engine Oil
7C***73Lines Group-Engine Oil; Engine Oil Lines Group1
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7c5402 Pan Gp-Oil
1w7632 Pan Gp-Oil
7e2971 Pump Gp-Engine Oil
7E***71Pump Group-Engine Oil; Engine Oil Pump Group1
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7e3687 Pump Gp-Engine Oil
Power Train-Power Transmission Unit
9c8157 Brake & Planetary Gp
8r6264 Brake Gp-Parking
6Y***18Brake Group-Parking1
8R***64Brake Group-Parking1
8R***98Brake Group-Parking1
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6y0218 Brake Gp-Parking
8r7098 Brake Gp-Parking
8e7228 Case & Parts Gp
8e2340 Case & Parts Gp
8E***40Case & Parts Group-Planetary; Case & Parts Gp1
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9w6884 Clutch Gp
9w7726 Clutch Gp
8e7229 Clutch Gp
9w6883 Clutch Gp
8e7230 Clutch Gp
5g7645 Control Gp-Transmission
8c5321 Control Gp-Transmission
8c6135 Control Gp-Transmission
3e0469 Control Gp-Transmission
8e5526 Control Gp-Transmission Hydraulic
8E***26Control Group-Transmission Hydraulic; Transmission Hydraulic Control Group1
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9w7729 Control Gp-Transmission Hydraulic
9W***29Control Group-Transmission Hydraulic; Control Gp-Transmission Hydraulic1
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4e0695 Differential Ar-Limited Slip-2 Required
4E***95Differential Ar1
4E***96Gear-Bevel2
4E***97Differential Group2
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8r6622 Differential Gp
9c8156 Differential Gp
8r6618 Differential Gp
3H***54Washer-Hard; (13.5x22.5x3.0-mm Thk)(Hard)8
6V***96Bolt; (M12x1.75x80-mm)8
8R***18Differential Group1
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4e0697 Differential Gp
3w8032 Filler Gp-Power Train Oil
6y3557 Filter Gp-Transmission
6Y***57Filter Group-Transmission; -Power Train1
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9c8155 Gear Gp-Bevel
6y0235 Gear Gp-Output
8e7375 Gear Gp-Output
8r4314 Guard Gp-Power Train
4e4737 Guard Gp-Power Train
9c8158 Housing Gp-Axle
9c8154 Housing Gp-Axle
3w8033 Lines Gp-Power Train Oil
4e7535 Lines Gp-Power Train Oil
3w9916 Neutralizer Gp
6y5000 Pump Gp-Gear
6y5001 Pump Gp-Gear
6Y***01Pump Group-Gear; Pump Gp-Gerotor1
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4e7496 Service Gp-Transmission Pump Priming
3J***54Packing,Preformed Part Of Kit P/N 5r***272
4E***49Flange1
4E***96Service Group-Tmsn Pump Priming1
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8y0797 Drive Shaft Gp
8y1115 Slip Joint Gp
5t8739 Spider & Bearing Gp
4e1328 Switch Gp
1t1703 Torque Converter Gp
1t1704 Torque Converter Gp
8e9102 Transmission Ar
1T***04Torque Converter Group1
3E***98Power Train Oil Lines1
6Y***01Pump Group-Gear; Pump Gp-Gerotor1
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9w7724 Transmission Ar
1T***03Torque Converter Group1
6Y***35Gear Group-Output1
6Y***01Pump Group-Gear; Pump Gp-Gerotor1
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8e5525 Valve Gp-2
9w8388 Valve Gp
8e5523 Valve Gp-Dump
8E***23Valve Group-Dump; (Transmission)(Load Piston, Transmission)1
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6y7622 Valve Gp-Dump
9w7189 Valve Gp-Flow Control
9W***89Valve Group-Flow Control; -Planetary Case1
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2t2951 Valve Gp-Fluid Sampling
2T***51Valve Group-Fluid Sampling; Manual Valve Group (Fluid Sampling)1
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8e5521 Valve Gp-Selector & Pressure Control
8E***21Valve Group-Selector & Press Cont1
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9w8387 Valve Gp-Selector & Pressure Control
9W***87Valve Group-Selector & Press Cont1
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9w2741 Valve Gp-Solenoid
7T***13Valve Group-Solenoid1
9W***39Valve Group-Solenoid1
9W***41Valve Group-Solenoid1
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7t4513 Valve Gp-Solenoid
3e6269 Valve Gp-Solenoid
3E***69Valve Group-Solenoid; (Transmission Control)1
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Service Equipment And Supplies
8f9866 Grease Gun As
3p2245 Hand Tool Gp
Name Plates & Films
4W***13Plate-Serial Number (Engine)1
5A***59Film-Patent; (Engine) (Inside Of Engine Closure, On Rear Of The Wall Which Interrupts Sound)1
5A***78Film-Patent; (Articulated Wheel Loader) (On Front Lower Part Of L.H. Platform)1
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Starting And Electrical System
9w3043 Alternator Gp*R
9W***43Alternator Group-Charging; (24-Volt, 52-Ampere)1
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7e7276 Alternator Gp
3w9918 Battery & Wiring Gp-Part 2 Of 2
3w9918 Battery & Wiring Gp-Part 1 Of 2
7t8000 Control Gp-Electronic
8r2950 Converter Gp-Electrical
7T***00Converter As-Electrical1
8R***50Converter Group-Electrical1
8T***47Bolt (M6x1.0x45mm); (M6x1.0x45-mm)4
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6t8941 Lamp Gp
9x1439 Lamp Gp-Flood
9X***39Lamp Group-Flood; -Rear-Ladder Access-Engine Work Light1
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9x6775 Lamp Gp-Flood
9x3462 Lamp Gp-Head
8c6207 Lamp Gp-Signal
8C***07Lamp Group-Signal; (Stop, Tail, Red)(Stop/Tail Red)1
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7x6066 Lamp Gp-Signal
7X***66Lamp Group-Signal; (Rear, Turn, Park)1
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8r2413 Lighting Gp
8r1763 Lighting Gp
8r6585 Lighting Gp
8r3312 Lighting Gp-Road-Part 1 Of 4
8r3312 Lighting Gp-Road-Part 2 Of 4
8r3312 Lighting Gp-Road-Part 4 Of 4
8r3312 Lighting Gp-Road-Part 3 Of 4
8r2653 Lighting Gp-Signal
8r3618 Lighting Gp-Warning
7c5526 Pulley Gp
7c3729 Pulley-Alternator
5g7648 Receptacle Gp-Starting
5G***48Receptacle Group-Auxiliary Start1
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9x5524 Solenoid As
7c4028 Solenoid Gp-Shut-Off-24 Volt
3w7999 Starting Aid Gp-Ether
9w3748 Starting Motor Gp-Electric
7e3562 Starting Motor Gp-Electric
3e5381 Starting Motor Gp-Electric
7n0718 Switch As-Disconnect
7N***18Switch As-Disconnect; -Battery-Ground Level1
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9g7641 Switch Gp
9G***41Switch Group-Start; -Engine, Key-Vims Service1
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3w8044 Warning Gp-Back-Up
8r2383 Wiring Gp-Part 1 Of 2
8r2383 Wiring Gp-Part 2 Of 2
8r4197 Wiring Gp-Cab-Part 1 Of 2
8r4197 Wiring Gp-Cab-Part 2 Of 2
8r2386 Wiring Gp-Front-Part 1 Of 3
8r2386 Wiring Gp-Front-Part 2 Of 3
8r2386 Wiring Gp-Front-Part 3 Of 3
8r2384 Wiring Gp-Rear
Steering And Braking System
3w8007 Control Gp-Parking Brake
3w8008 Control Gp-Service Brake-Part 1 Of 2
3w8008 Control Gp-Service Brake-Part 2 Of 2
3w8006 Control Gp-Service Brake
3w8023 Control Gp-Steering
6t3760 Control Gp-Switch
9t7209 Cylinder Gp-Steering-Lh (Chgs 00-02)
9t7209 Cylinder Gp-Steering-Lh (Chgs 03-05)
9t7210 Cylinder Gp-Steering-Rh (Chg 03)
9t7210 Cylinder Gp-Steering-Rh (Chgs 00-02)
3w8021 Lines Gp-Steering Oil-Part 1 Of 2
3w8021 Lines Gp-Steering Oil-Part 2 Of 2
5g7586 Lines & Pump Gp-Supplemental Steering-Part 1 Of 2
5G***86Pump & Lines Group; Pump & Lines Gp-Supplemental Steering1
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5g7586 Lines & Pump Gp-Supplemental Steering-Part 2 Of 2
5G***86Pump & Lines Group; Pump & Lines Gp-Supplemental Steering1
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9c4770 Pump & Mounting Gp
1H***27Seal 10.1 cm(3.984 In.) I.D.1
8T***39Capscrew; (Hex Hd) (M12 X 1.75 X 30l Gr 10.9)4
8T***23Washer-Hard; (13.5x25.5x3-mm Thk)(Bolt To Shield)4
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9t5484 Pump Gp-Gear
9t6763 Pump Gp-Metering
8r6981 Steering Ar-Supplemental
5G***86Pump & Lines Group; Pump & Lines Gp-Supplemental Steering1
7X***25Film-Used With Speedometer Group1
7X***26Film-Warning1
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8r0905 Lines & Valve Gp
4T***54Valve Group-Check & Relief1
5G***00Tube As1
5G***51Tube As1
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9t6631 Valve Gp-Check
6e4587 Valve Gp-Check
9t5985 Valve Gp-Flow Control & Relief
9T***85Valve Group-Flow Control & Relief1
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IT12B serial number reference

The Product Identification Number (PIN) plate is located on the machine's outer frame, typically near the operator's station or on the rear counterweight. The serial number prefix consists of the first three alphanumeric characters of the PIN; the remaining characters form the sequence ID. Use the full PIN to verify the exact build year and configuration via a dealer database.

PrefixIdentifies
9SFIT12B Integrated Toolcarrier
3NJIT12B Integrated Toolcarrier
1KFIT12B Integrated Toolcarrier

Frequently asked questions

What engine does the IT12B use?

The IT12B uses a Cat 3114 diesel engine with 75 net horsepower.

What is the operating weight?

The operating weight is 17,526.8 lb (7,949 kg).

What replaced the IT12B?

The IT12B was succeeded by the IT14G series integrated tool carrier.

What IT12B owners discuss

What engine powers the IT12B, and what are the known operational quirks for this series?
The IT12B is powered by a Cat C12 engine. Community consensus notes that while the C12 is generally reliable, it is sensitive to gross vehicle weight; keeping loads under 80,000 lb (36,287 kg) is critical for longevity. Common quirks include a tendency for oil leaks between the front structure and engine block, and crank position sensor failures. The engine prefers slower RPMs for peak torque and fuel economy, and it typically consumes 6-7 mpg in heavy applications. Early 3196 series engines had aluminum spacer block issues, but the C12 is considered an improvement, though head gasket retention can be a concern if head bolts are not replaced during service. have your dealer verify the specific engine tier and serial prefix for your unit.
What are the typical hydraulic and powertrain behaviors for the IT12B?
The IT12B features a robust hydraulic system with quick coupler technology. Operators report that low hydraulic oil levels cause cavitation that destroys pumps, so maintaining correct fluid levels is essential. The machine uses Cat HYDO Advanced hydraulic oil; mixing with generic oils can create sludge and clog valves. The powertrain is designed for utility and material handling, with a standard operating width of 0 m (7 ft 0 in) and a length of 0.13 m (20 ft 5 in). The system is sensitive to cross-contamination; operators should ensure less than 10% contamination when switching oil types to prevent chemical reactions that damage components.
What undercarriage or wear patterns are typical for this machine type?
As an integrated tool carrier, the IT12B experiences high stress on its front linkage and attachment points due to its dual function as a loader and a carrier. The standard operating length with the bucket on the ground is 20.54 ft (6.26 m). Wear patterns often include fatigue in the quick coupler mechanisms and hydraulic lines due to the high-frequency articulation and load cycling. The machine's 1.6 yd³ bucket capacity and 75 hp output indicate it is a mid-size utility machine; undercarriage wear is less of a primary concern than in crawler models, but tire wear and rim damage are common in rocky or debris-heavy jobsites. The operating weight is approximately 17,527 lb (7,949 kg), which influences ground pressure and tire selection.
What are the common electrical or sensor issues reported for the IT12B?
Electrical instability is a noted issue in Caterpillar equipment of this era. The IT12B uses an Electronic Control Module (ECM) that generates fault codes via MID (Module Identifier), CID (Component Identifier), and FMI (Failure Mode Identifier). Common electrical complaints include crank position sensor failures and ECM issues. Operators should monitor for coolant temperature sensor faults (CID 0110) and injector rail pressure issues. Diagnostic tools like CAT ET are required to interpret these codes accurately. Cross-contamination of fluids can also lead to electrical connector corrosion if seals fail.
What fluids and specifications should be used for the IT12B?
The IT12B requires specific Caterpillar fluids to maintain warranty and performance. Engine oil should be Cat DEO (Diesel Engine Oil) or DEO-ULS for ECF-3/API CJ-4 compliance, available in SAE 15W-40 or 10W-30. Hydraulic systems require Cat HYDO Advanced oil; using generic oils can cause sludge and valve clogging. Coolant should be Cat Extended Life Coolant (ELC), typically ethylene glycol-based. Transmission fluid is Cat TDTO (Transmission and Torque Converter Oil). Always verify the exact specification in the Operation and Maintenance Manual for your serial range, as formulations can vary by region and emissions tier.
What is the critical 'what to check when buying a used IT12B' entry?
When buying a used IT12B, verify the serial number prefix (e.g., 9SF, 3NJ, 1KF) to confirm the exact model year and configuration, as specs vary by series. Check the engine for oil leaks between the front structure and block, and inspect the crank position sensor history. Verify the hydraulic fluid condition for water contamination (milky oil indicates coolant leak) and check for sludge from mixed oil types. Inspect the quick coupler mechanism for wear and ensure the ECM is functioning without active fault codes. Confirm the operating weight matches your transport and jobsite requirements, as it is approximately 7,949 kg (17,527 lb). Have your dealer verify the machine build date and original configuration via the Cat Service Information System.

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

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