Part of the John Deere Repair Manuals.
This is the John Deere factory Diagnosis and Tests manual for the 5055E, 5065E, 5075E, 5078E, 5085E and 5090E utility tractors. Its 1,032 pages are organized by system: each section leads with component locations, explains how that system works, then walks through the diagnostic trees, test procedures and adjustment specs the dealer technician follows to pin down a fault. It covers the engine, fuel and air intake, the full electrical system (with separate wiring schematics for each model sub-group), drive train and clutch, brakes and steering, and the hydraulic system with pressure and flow tests. This is the diagnostic edition - it tells you how to find what is wrong. For teardown and rebuild steps, the companion Repair manual covers those procedures.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | Safety Precautions, Component Identification Locations, Manual Navigation | |
| Engine System | Component Location, Theory of Operation, Compression Tests, Oil Pressure Tests, Cooling System Tests, Idle Speed Adjustment, Diagnostic Trouble Codes | |
| Fuel and Air Intake System | Fuel Transfer Pump Tests, Injection Nozzle Testing, Air Intake Restriction Diagnosis, Fuel Bleeding Procedures, Fip Synchronization | |
| Electrical System | Wiring Schematics by Model Variant (5055E/5065E, 5075E, 5078E/5085E/5090E), Ccu Fault Codes, Connector and Harness Tests, Neutral Safety Switch Diagnosis | |
| Drive Train | Transmission Component Location, Clutch Free Play Adjustment, MFWD Diagnostics, Power Train Tests and Adjustments | |
| Brake and Steering | Brake Pedal Adjustment, Hydraulic Brake Tests, Brake Pressure Specs, Steering Cylinder Diagnostics | |
| Hydraulic System | Pump Pressure Tests, Valve Block Diagnostics, Hydraulic Schematics, Relief Valve Settings, Flow Tests and Adjustments |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Low Idle Engine Speed | 850 +/-25 rpm | |
| Full Load Engine Speed | 2300 rpm | |
| Cylinder Minimum Compression Pressure | 2400 kPa (24 bar / 350 psi) | |
| Maximum Compression Difference Between Cylinders | 350 kPa (3.5 bar / 50 psi) | |
| Valve Clearance - Inlet | 0.35 mm (0.014 in.) | |
| Valve Clearance - Outlet | 0.45 mm (0.018 in.) | |
| Minimum Engine Oil Pressure (at 825 rpm) | 100 kPa (1 bar / 15 psi) | |
| Minimum Engine Oil Pressure (at 2500 rpm) | 277-483 kPa (2.77-4.83 bar / 40-70 psi) | |
| Thermostat Opening Temperature (starts to open) | 71 C (160 F) | |
| Cooling System Test Pressure (maximum apply) | 120 kPa (1.20 bar / 18 psi) |
