Part of the John Deere Repair Manuals.
TM12802 diagnoses and tests the John Deere 328E and 332E skid steer loaders with EH controls and the Yanmar 4TNV94CHT engine. It covers diagnostic trouble codes for the ECU, EMU, HCU, JSL, JSR, SSM and VCU controllers. It also covers the operational checkout, electrical schematics, and hydraulic and hydrostatic pressure and flow tests.
On an EH loader, a code tells you which controller complained, not what broke. The hard part is getting from an SPN.FMI number to the right circuit, connector and test. This book lays out each code alongside circuit diagnostics, harness drawings and spec values.
This is the operation and test volume. Repair procedures are in the separate repair manual.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information and Safety | 1-34 | Manual Identification, PIN Decoding, Safety |
| DTCs: Engine Control Unit (ECU) | 35-78 | ECU Diagnostic Trouble Codes Incl. Glow Plug Relay, Foot Throttle, Engine Speed Control Pedal |
| DTCs: Engagement and Monitor Unit (EMU) | 79-140 | EMU Codes Incl. Park Brake Release Input, Anti-Theft |
| DTCs: Hydraulic Control Unit (HCU) | 141-220 | HCU Diagnostic Trouble Codes |
| DTCs: Joystick Controllers and Sealed Switch Module | 221-258 | Left (JSL) and Right (JSR) Joystick Controller Codes, Sealed Switch Module (SSM) Codes |
| DTCs: Vehicle Control Unit (VCU) | 259-310 | VCU Diagnostic Trouble Codes |
| Operational Checkout Procedure | 311-336 | Walk-Around Inspection, Operator-Seat Checks, Engine Idle Check, Cycle Times Check for 328E and 332E |
| Engine | 337-354 | Yanmar 4TNV94CHT Theory of Operation, Diagnostic Information, Tests |
| Electrical System Information | 355-364 | Electrical Diagram Information, CINCH Connector Repair |
| Electrical System Diagrams | 365-547 | Fuse and Relay Specifications, System Functional Schematics, Harness and Component Location Drawings |
| Electrical Sub-System Diagnostics | 548-626 | Circuit-By-Circuit Sub-System Diagnostics |
| Monitor Operation and References | 627-726 | Engagement and Monitor Unit Operation, Service ADVISOR Connection Procedure, Electrical References |
| Power Train | 727-742 | Power Train Operation, Component Location, Diagnostics, Drive Chain Tension Check and Adjustment |
| Hydraulic System | 743-910 | Theory of Operation, Hydraulic System Schematics, Diagnostic Information, Ride Control Accumulator, Relief Valve, Charge Pressure, Cylinder Leakage, Charge Pump Flow and Fan Motor Speed Tests |
| Hydrostatic System | 911-986 | Theory of Operation, Hydrostatic System Schematics, Pump Flow, Pump Neutral, Wheel Speed, Park Brake Release Pressure and Motor Case Drain Tests |
| Heating and Air Conditioning | 987-1014 | Air Conditioning Cycle of Operation, Component Location, Diagnostics, Refrigerant Handling and Tests |
| Dealer Fabricated Tools and Index | 1015-1030 | Dealer Fabricated Tools, Alphabetical Index |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Manual | TM12802 Operation & Test Technical Manual (19MAR19) | p. 1 |
| Engine | Yanmar 4TNV94CHT, John Deere 3.1 L diesel | p. 339 |
| Hydraulic system relief valve pressure | 23 097-24 476 kPa (231-245 bar) (3350-3550 psi) | p. 877 |
| Charge pressure relief valve pressure | 3400-4800 kPa (34-48 bar) (500-700 psi) | p. 879 |
| Hydraulic cylinder leakage (maximum) | 5 mL/min. (0.2 oz./min.) | p. 893 |
| Hydraulic fan speed, operating temperature | 2350-2600 rpm | p. 902 |
| Hydraulic fan speed, machine cold (maximum) | 1500 rpm | p. 901 |
| Wheel speed, single speed | 65-75 rpm | p. 982 |
| Wheel speed, two speed 328E / 332E | 110-120 rpm / 105-115 rpm | p. 982 |
| Park brake release pressure (typical, new) | 2757 kPa (27.5 bar) (400 psi) | p. 983 |
| Park brake release pressure (minimum) | 1517 kPa (15.2 bar) (220 psi) | p. 983 |
| Axle housing nut torque | 305 N·m (225 lb·ft) | p. 741 |
| Drive chain play (maximum) | 5 mm (0.197 in) | p. 741 |
| 328E boom raise cycle time (maximum) | 4.2 sec. | p. 334 |
| 332E boom raise cycle time (maximum) | 4.4 sec. | p. 335 |
| Glow plug fuse F31 | 80 A | p. 365 |
| Refrigerant | R134a | p. 1003 |
