John Deere 120D Excavator Repair Technical Manual (TM10737)

John Deere 120D Excavator Repair Technical Manual (TM10737 18AUG15)

This official repair manual provides comprehensive service, troubleshooting, and maintenance procedures for the John Deere 120D Excavator. It includes hydraulic system repairs, engine overhauls, undercarriage servicing, and electrical system diagnostics to ensure reliable machine performance.

File Format: PDF

Size: 28.16 MB

No. of pages: 512

Language: English

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Table of Contents Overview:

General Information & Safety

• Recognizing safety information
• Using and maintaining seat belts
• Preventing unintended machine movement
• Avoiding worksite hazards and machine tip-overs
• Proper handling of high-pressure fluids
• Fire prevention and battery explosion safety

Track System

• Track roller removal, installation, and pressure testing
• Track carrier roller and chain servicing
• Track adjuster and recoil spring maintenance
• Front idler and sprocket replacement

Axles & Suspension Systems

• Travel gearbox servicing and adjustments
• Travel motor and park brake diagnostics
• Travel speed solenoid valve troubleshooting

Engine & Cooling System

• PowerTech™ 4.5L and 6.8L John Deere engines
• Radiator, hydraulic oil cooler, and intercooler maintenance
• Fuel tank servicing and fuel filter replacements

Hydraulic System

• Hydraulic pump removal, installation, and calibration
• Control valve and solenoid troubleshooting
• Hydraulic cylinder maintenance and bleeding procedures
• Hydraulic oil tank removal and reinstallation

Operator’s Station

• Cab removal, installation, and windshield servicing
• Seat and seat belt maintenance
• Heating and air conditioning troubleshooting
• R134a refrigerant recovery and charging procedures

Excavator Boom, Arm & Attachments

• Bucket, boom, and arm servicing
• Boom and bucket cylinder disassembly and assembly
• Pin and bushing inspections

Swing & Rotation System

• Swing gearbox servicing and start-up procedures
• Upperstructure removal and reinstallation
• Hydraulic swing motor and brake troubleshooting

Dealer Fabricated Tools

• Track recoil spring disassembly and assembly tools
• Travel gear case nut wrench
• Center joint (rotary manifold) lifting tool

For complete service information, also see:

JDLink (MTG) Technical Manual .......... TM114519
120D Excavator Diagnostic .......... TM10736
Alternators and Starting Motors .......... CTM77
PowerTech E 4.5 and 6.8L Diesel Engines Level 16 Electronic Fuel System With Denso HPCR .......... CTM502
Super Caddy Oil Cleanup Procedure .......... CTM310
PowerTech 4.5L & 6.8L Diesel Engines Tier 1/Stage I, Tier 2/Stage II, Tier 3/Stage IIIA, Tier 3/Stage IIA, Tier 3/Stage III (Base Engine) .......... CTM104

This John Deere 120D Excavator Repair Technical Manual is an essential resource for technicians, mechanics, and excavator owners, providing detailed repair instructions, diagnostics, and maintenance procedures for peak machine performance.