John Deere 444J, 544J and 624J Loader Operation and Test Technical Manual (TM2135)

John Deere 444J, 544J, and 624J Loader Operation and Test Technical Manual (TM2135)

This operation and test technical manual provides an in-depth guide to diagnostics, troubleshooting, and performance testing for the John Deere 444J, 544J, and 624J Loaders. Covering essential systems including engine, powertrain, hydraulics, electrical components, and HVAC, this manual is an indispensable resource for service technicians and equipment operators looking to optimize machine efficiency and longevity.

Model Covers:

John Deere 444J, 544J, and 624J Loaders

File Format: PDF

Size: 95.64 MB

No. of pages: 1266

Language: English

Delivery Method: Instant Download – Get instant access after purchase.

📑 Table of Contents Overview:

General Information and Safety Procedures

• Machine safety guidelines for handling fluids, high-pressure components, and electrical systems
• Emergency response procedures and personal protective equipment requirements
• Service precautions, lifting recommendations, and proper disposal of fluids

Operational Checkout and System Performance

• Full operational checkout process for complete system evaluation
• Service code diagnostics and troubleshooting common malfunctions
• Powertrain, braking, and steering system verification tests

Engine Performance and Testing

• PowerTech engine operation, fuel system performance, and cooling system tests
• Turbocharger and fuel injector efficiency analysis
• Compression testing, intake airflow diagnostics, and exhaust system checks

Electrical System and Diagnostics

• Comprehensive wiring diagrams and system schematics
• Battery, alternator, and charging system tests
• Control module reprogramming and sensor calibration

Powertrain and Transmission Testing

• Torque converter stall speed testing and shift control diagnostics
• Clutch pressure testing and hydraulic transmission control verification
• Axle recirculation pump flow assessment and differential lock functionality

Hydraulic System and Flow Testing

• Loader and implement hydraulic circuit analysis
• Control valve pressure adjustments and pilot system testing
• Hydraulic pump efficiency tests and system leakage evaluation

Heating, Ventilation, and Air Conditioning (HVAC)

• Refrigerant system handling and pressure regulation
• Blower motor function testing and air duct airflow evaluation
• Compressor and expansion valve diagnostics for optimal performance

For complete service information, also see:

444J, 544J, 624J Loader Repair Manual .......... TM2136
444J, 544J, 624J Loader Operator’s Manual .......... OMT197190
Alternators and Starting Motors .......... CTM77
PowerTech 4.5L & 6.8L Diesel Engines - Base Engine .......... CTM104
Teammate III 1000, 1200, and 1400 Series Inboard Planetary Axles .......... CTM150
PowerTech 4.5L and 6.8L Diesel Engines - Level 11 Electronic Fuel System with Denso HPCR .......... CTM220
Super Caddy Oil Cleanup Procedure .......... CTM310
PowerTech 4.5L and 6.8L Diesel Engines - Level 12 Electronic Fuel System with DE10 Pump .......... CTM331
120 Series Hydraulic Cylinders .......... TM-H120A
125 Series Hydraulic Cylinders .......... TM-H125A
185 Series Hydraulic Cylinders .......... TM-H185A
Service Advisor System Computer Connection .......... T133991

This John Deere 444J, 544J, and 624J Loader Operation and Test Technical Manual is a must-have guide for technicians and operators, providing detailed testing procedures and diagnostics to ensure the highest level of machine performance and reliability.