John Deere 450J, 550J, 650J Crawler Dozer SN -141666 Diagnostic Operation and Test Manual (TM2257)

John Deere 450J, 550J, 650J Crawler Dozer (S.N. -141666) Diagnostic Operation and Test Manual (TM2257 21 JUL 13)

This official diagnostic and test manual provides detailed troubleshooting, operational checkouts, and system testing procedures for the John Deere 450J, 550J, and 650J crawler dozers. Covering critical systems such as the engine, electrical circuits, hydrostatic transmission, hydraulics, and air conditioning, this guide is essential for technicians ensuring peak diagnostic accuracy and operational efficiency.

Model Covers:

John Deere 450J, 550J, 650J Crawler Dozer

(S.N. -141666)

File Format: PDF

Size: 25.21 MB

No. of pages: 368

Delivery Method: Instant Download – Access your file immediately after purchase.

📑 Included Sections:

General Safety and Preparation

• Operator qualifications, fire prevention, and safe handling of chemicals and pressurized fluids
• Machine preparation for service, emergency readiness, and cab guarding practices
• Battery safety, worksite hazards, and tip-over avoidance techniques

Operational Checkout Procedures

• Step-by-step tests for radiator cap, coolant, fan belt, filters, and hydraulic pump performance
• Checks for cab door sealing, battery disconnect, horn, neutral start switch, and blade function
• Transmission speed, A/C system, park brake, and alternator operational verifications

Engine System Diagnostics

• PowerTech™ 4.5L engine theory, starting aid function, turbocharger boost, and fuel system tests
• Slow and fast idle testing, compression behavior, and injection system diagnostics

Electrical System and CAN Bus

• Wiring diagrams and component location for harnesses W4–W13
• Sub-system theory for ECU, TCU, MDU, CAN communication, and start/charge circuits
• Access and interpretation of DTCs for MDU, TCU, and ECU along with calibration procedures

Hydraulic System Testing

• Hydraulic flow, pressure, and cylinder leakage tests
• Valve drift, blade float, cycle time, and filter bypass analysis
• Linkage adjustments for auxiliary, lift, pitch, and angle control valves

Hydrostatic System Diagnostics

• Pump and motor start-up and flushing procedures
• Charge pressure, servo pressure, and displacement control valve testing
• Overheating, low power, tracking, and calibration flow charts
• Null adjustments, park brake towing procedures, and pump efficiency tests

Heating and Air Conditioning System

• Cycle-of-operation theory and component diagnosis
• High/low pressure switch testing, freeze control, and leak detection
• Proper refrigerant handling (R134a), charge capacities, and airflow troubleshooting

For complete service information, also see:

450J, 550J, 650J Crawler Dozer (S.N. -141666) .......... TM2258
Alternators and Starting Motors .......... CTM77
PowerTech 4.5L & 6.8L Diesel Engines - Level 12 Electronic Fuel System with Stanadyne DE10 Pump .......... CTM331
Super Caddy Oil Cleanup Procedure .......... CTM310
4000S Winches .......... CTM166
PowerTech 4.5L & 6.8L Diesel Engines Tier 1/Stage I, Tier 2/Stage II, Tier 3/Stage IIIA, Tier 3/Stage IIA, Tier 3/Stage III (Base Engine) .......... CTM104

This John Deere 450J, 550J, 650J Diagnostic Operation and Test Manual is a must-have reference for accurate fault isolation, sensor testing, calibration procedures, and complete operational diagnostics for advanced dozer servicing.