Part of the John Deere Repair Manuals.
This is the Operation and Test manual (TM11743) for the John Deere 744K 4WD loader, serial numbers 632968-664100. It is the diagnostics book, not the teardown book: fault code trees in SPN.FMI format (a restricted engine air filter reads 000107.00), theory of operation, and test procedures for the ECU, TCU, VCU, SSM, ADU, ROD, RDR, JSV, JSC, and TPM controllers. You also get the full electrical schematic with W1-W42 harness wiring diagrams, the operational checkout, turbo boost testing on the 6090HDW08, hydraulic circuit diagnostics from steering to ride control, power train tests and adjustments, and R134a charge and pressure specs. Torque values and disassembly live in the companion Repair TM - this book finds the problem first.
What's Inside This John Deere 744K Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 8-36 | Safety Information, Manual Identification, Serial Number and Pin Identification |
| Diagnostic Trouble Codes - Engine and Transmission | 37-202 | Group 10 Engine Control Unit (ECU) Codes, Group 20 Transmission Control Unit (Tcu) Codes |
| Diagnostic Trouble Codes - Vehicle Control Unit | 203-511 | Group 30 Vehicle Control Unit (Vcu) Codes |
| Diagnostic Trouble Codes - Switch Module and Display | 512-612 | Group 40 Sealed Switch Module (Ssm) Codes, Group 50 Advanced Display Unit (Adu) Codes |
| Diagnostic Trouble Codes - Radar, Joystick Steering and Tire Pressure | 613-649 | Group 60 Radar Object Detection (Rod), Group 70 Ground Speed Radar (Rdr), Group 80 Joystick Steering Valve (Jsv), Group 90 Joystick Steering Controller (Jsc), Group 100 Tire Pressure Monitoring (Tpm) |
| Operational Checkout Procedure | 650-683 | Operational Checkout |
| Engine | 684-721 | Theory of Operation, Fast Fill Fuel System, Fluid Sampling Procedure, Turbocharger Boost Test, Engine Idle Speeds, Auto Idle/Shutdown |
| Electrical System | 722-1061 | System Functional Schematic, Component Wiring Diagrams (Harnesses W1-W42), Sub-System Diagnostics, Monitor Operation |
| Power Train | 1062-1226 | Theory of Operation, Diagnostic Information, Adjustments, Tests |
| Hydraulic System | 1227-1491 | Hydraulic System Schematic, Steering and Orbital Valve, Loader Control Valve, Service Brakes, Ride Control, Diagnostic Procedures |
| Heating and Air Conditioning | 1492-1516 | Theory of Operation, Blower Speed Switch Tests, R134a Charge and Pressure Tests |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine Slow Idle Speed | 900 rpm | p. 717 |
| Engine Fast Idle Speed | 2000 rpm | p. 717 |
| Turbocharger Boost Pressure (6090HDW08 @ 2180 rpm) | 144.79-165.47 kPa (21-24 psi) | p. 716 |
| Auto idle/shutdown coolant temperature threshold | less than 90 C (194 F) | p. 717 |
| Engine oil sampling interval | 250 hours | p. 712 |
| Coolant/hydraulic/transmission oil sampling interval | 500 hours | p. 712 |
| Hydraulic Oil Temperature (normal) | 60-70 C (140-160 F) | p. 1457 |
| Service Brake Accumulator Gas Precharge Pressure | 1070-1207 kPa (155-175 psi) | p. 1457 |
| Service Brakes Applied Pressure | 1944-3447 kPa (282-500 psi) | p. 1460 |
| Pin Disconnect Pressure | 6033-6378 kPa (875-925 psi) | p. 1467 |
| Pump Cut-Off Pressure | 23100-23800 kPa (3350-3450 psi) | p. 1471 |
| New Hydraulic Fan Pump Flow Rate (minimum) | 51 L/min. (13.5 gpm) | p. 1480 |
| R134a Refrigerant Charge Capacity | 2.72 kg (6.00 lb.) | p. 1509 |
| AC System Low-Side Pressure (ambient 19-21 C) | 84-102 kPa (12-15 psi) | p. 1512 |
| AC System High-Side Pressure (ambient 19-21 C) | 923-1118 kPa (134-162 psi) | p. 1512 |
