John Deere 120C & 120C LC Excavator Repair Technical Manual 2002-2005
Covers 120C and 120C LC Hydraulic/Construction Excavator models from 2002-2005, detailing engine, hydraulic, and electrical systems with part numbers and diagrams. Ref: TM1935
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John Deere Models Covered & Key Technical Specifications
Models: John Deere 120C, John Deere 120C LC
Sub-models / Variants: 120C, 120C LC
Build Years: 2002–2005
Technical Data:
- Engine: POWERTECH 4.5 L & 6.8 L diesel engines
- Cooling system capacity: 26.5 L
- Component weight (track roller): 21 kg
- Component weight (sprocket): 37 kg
- Component weight (front idler): 82 kg
- Main hydraulic pump weight: 95 kg
- Track roller oil capacity: 200 ml
- Track carrier roller oil capacity: 48 ml
- Track roller-to-frame cap screw torque: 300 Nm (225 lb-ft)
- Track carrier roller-to-frame cap screw torque: 98 Nm (72 lb-ft)
- Sprocket-to-propel gearbox cap screw torque: 265 Nm (195 lb-ft)
- Track shoe-to-link cap screw torque: 163 Nm (120 lb-ft) plus 1/2 (180°) turn
- Track roller oil cavity air test pressure: 110 ± 18 kPa (1.1 ± 0.3 bar)
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John Deere 120C & 120C LC Excavator Technical Documentation
- Covers the 2002–2005 John Deere 120C and 120C LC excavator series, detailing repair procedures for undercarriage, engine systems, and chassis components
- Official John Deere publication TM1935, dated April 2009
- Contains detailed technical torque charts for unified inch and metric fasteners, including specific assembly values for track rollers, carriers, and sprocket drives
- Downloads to your account within seconds of checkout
- Laid out for standard letter and A4 printing
- This 2009 edition serves as the definitive reference for servicing the 120C build, providing consistent technical data for the cooling, fuel, and hydraulic undercarriage subsystems
Technical Scope and Structure
The 120C and 120C LC technical manual establishes a clear reference for the repair of core systems. Content is segmented into functional chapters including general information, track systems, axle shafts, engine auxiliary components, and the operator's station.
Detailed chapters document the removal and installation of engine cooling, intake, and fuel systems, alongside specific instructions for the frame and swing or pivoting mechanisms. Diagnostic data and assembly specifications support the service of major excavator components like track rollers, front idlers, and sprockets.
Specification Highlights
Torque values are documented for a wide range of hardware, ranging from standardized hydraulic connection maintenance to heavy-duty structural bolting. Track roller-to-frame cap screw torque is specified at 300 Nm in the engine and chassis assembly data. The cooling system capacity for the 120C excavator is documented at 26.5 liters. Magneto pick-up and related electrical system checks rely on the integrated technical data tables. Reference only — always consult a certified technician before performing service on this equipment.
This official John Deere 490-page OEM technical manual covers the 2002–2005 120C and 120C LC excavators, documenting engine, undercarriage, and hydraulic system repair specifications for the specified construction equipment build.
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