John Deere 4120, 4320, 4520, 4720 Compact Utility Tractor Technical Manual
John Deere Tractor Manual
Table of Contents (Technical Manual TM2370)
- Safety
- Specifications and Information
- Engine – Diesel
- Electrical
- Power Train – Hydrostatic
- Power Train – Final Drive
- Hydraulics
- Steering
- Brakes
- HVAC
- Miscellaneous
📘 Complete Technical Manual for John Deere 4120, 4320, 4520, 4720 Compact Tractors
Looking for the John Deere 4120, 4320, 4520, 4720 Technical Manual in PDF format? This official service manual provides professional-grade diagnostics, repair steps, and maintenance procedures for John Deere compact utility tractors. Ideal for technicians, DIY users, and farm owners.
✅ Engine Repair & Diagnostics
Detailed procedures for engine disassembly, inspection, repair, and reassembly. Includes specifications for:
Fuel system
Cooling system
Lubrication system
Diesel engine troubleshooting
✅ Transmission and Powertrain
Covers hydrostatic and PowrReverser™ transmission systems, drive shaft assembly, clutch, and axle repairs.
Includes step-by-step torque specs and fluid types.
✅ Electrical System Schematics
Accurate wiring diagrams, fuse box locations, starter and alternator testing.
Great for solving electrical faults on all four models.
✅ Hydraulic System Repair
Complete hydraulic diagnostics, pump overhaul, valve function, and loader circuit servicing.
Used to restore loader and 3-point hitch performance.
✅ Steering and Braking Systems
Explains how to inspect, service, and calibrate steering cylinders, brakes, and control valves.
Includes hydraulic assist steering and wet disc brake setups.
✅ Operator Station & Controls
Cabin component servicing: instrument panel, PTO switches, throttle linkages, safety systems, and seat assemblies.
✅ Preventive Maintenance Schedule
Chart-based inspection intervals with parts lists and oil types.
Extends the service life of John Deere 4120, 4320, 4520, and 4720 tractors.
