Part of the John Deere Repair Manuals.
This 906-page John Deere 450D/455D Technical Manual (OEM #TM1291) covers both the Crawler Bulldozer and Crawler Loader, walking you through tracks, transmission, engine, winch, loader, bulldozer, and backhoe systems from the ground up. Inside you'll find complete wiring diagrams for the alternator and instrument circuits, hydraulic schematics for the loader and bulldozer systems, and a full troubleshooting section covering engine, electrical, and power train faults. Set track adjusting cylinder yoke torque to 115 ± 11 N·m and check front idler flange height against the 19.3 mm new-part spec before it wears past the 24.4 mm limit. No more tearing into a final drive on guesswork or chasing a knocking engine with secondhand numbers. This PDF is bookmarked by system, so you jump straight from Tracks to Winch to Backhoe without scrolling through 906 pages, and it opens fine on a tablet propped on the fender while you work.
What's Inside This John Deere 450D, 455D Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction and Safety | 7-14 | ROPS, Coolant Heater, Starting Fluid, High-Pressure Fluids, Fire Hazards, Protective Clothing |
| General Information | 15-30 | General Specifications, Cap Screw Torque Values, Fuels and Lubricants |
| Tracks | 31-72 | Track Systems |
| Axle and Suspension Systems | 73-100 | Axle Shaft, Bearing and Reduction Gears |
| Transmission | 101-186 | Controls, Gears, Shafts, Bearings and H-L-R Clutch |
| Engine | 187-328 | Removal and Installation, Crankshaft and Main Bearings, Camshaft and Valve Actuating Means, Connecting Rods and Pistons, Cylinder Block, Oiling System, Cylinder Head and Valves |
| Engine Auxiliary Systems | 329-346 | Cold Weather Starting Aids, Cooling Systems, Speed Control, External Fuel Supply Systems |
| Clutch | 347-362 | Controls, Elements |
| Steering System | 363-366 | Hydralic System |
| Equipment Attaching | 367-370 | Drawbar |
| Electrical System | 371-390 | Batteries, Support and Cables, Alternator, Regulator and Charging System Wiring, Wiring Harness and Switches, Instruments and Indicators |
| Frames, Chassis, or Supporting Structure | 391-400 | Frames, Frame Bottom Guards, Chassis Weights |
| Operator's Station | 401-410 | Operator Enclosure |
| Sheet Metal and Styling | 411-420 | Hood or Engine Enclosure, Grille and Grille Housing |
| Winch | 421-476 | Controls Linkage, Winch Drive and Clutches, Hydraulic System |
| Loader | 477-524 | Buckets, Forks, Controls Linkage, Frames, Hydraulic System |
| Bulldozers | 525-572 | Blades, Controls Linkage, Frames, Hydraulic System |
| Backhoe 9300 (Loader-Backhoe) | 573-634 | 9300 Backhoe Buckets, Teeth, Shanks and Side Cutters, Boom and Dipperstick, Swing Frame, Stabilizers, Control Linkage, Backhoe Hydraulic Cylinders and Valve |
| Backhoe 93 (Standard) | 635-694 | 93 Backhoe Buckets and Teeth, Boom and Crowd Cylinders, Swing Mechanism, Stabilizer Cylinders, Control Linkage, Backhoe Hydraulic System and Valve |
| Arch or Boom, or Cranes | 695-698 | Arch Frame |
| PTO or Winch Drive | 699-704 | Controls Linkage, Winch Drive and Clutches, Winch Hydraulic System |
| Ground Conditioning Tool | 705-720 | Teeth Shanks, Frame, Hydraulic System |
| System Testing (Diagnostics) | 721-890 | General Information and Operational Checkout Procedure, Engine Tests, Electrical System Tests, Power Train Tests (H-L-R Transmission, Clutch, Final Drives), Hydraulic System Tests, Miscellaneous Component Tests |
| Special Tools | 891-906 | JT38006 Liner Holding Fixture, JT38007 Track Roller Installation Tool, JT38014 Final Drive Housing Lifting Tool, JT38015 Flanged Axle Shaft Removing Tool |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine oil drain interval reduction if fuel sulfur content exceeds 0.5 percent | 50 percent (to 100 hours) | p. 23 |
| Track adjusting cylinder yoke to idler bracket | 115 ± 11 N·m (85 ± 8 lb-ft) | p. 34 |
| Front idler flange height (new) | 19.3 mm (0.76 in.) | p. 35 |
| Final drive inner bearing cover cap screws | 67.8 ± 6.78 N-m (50 ± 5 lb-ft) | p. 75 |
| Final drive housing to steering clutch housing cap screws | 325.44 ± 32.54 N·m (240 ± 24 lb-ft) | p. 75 |
| Yoke clearance between lever and neutral stop | 1.5 mm (0.60 in.) | p. 108 |
| Countershaft Bearing Quill Cap Screws Torque | 47 ± 4.7 N·m (35 ± 3.5 lb-ft) | p. 110 |
| Winch to steering clutch housing | 203 N·m (150 lb-ft) | p. 426 |
| Upper carrier roller assembly support attaching torque | 115 N·m | p. 34 |
| Camshaft endplay (new, max) | 0.23 mm | p. 212 |
John Deere 450D, 455D Common Problems This Manual Covers
Machine barely moves or won't pull at all once shifted into the higher gears
Check the dry clutch disk in the HL-R transmission and inspect the shift linkage for looseness. The H-L-R is a four-speed collar shift unit; gear changes need full clutch depression, but High-Low-Reverse shifts happen hydraulically under load (page 788). If power drops off only in higher ranges, suspect a slipping hydraulic clutch pack rather than the linkage.
Manual Section: H-L-R Transmission Malfunctions Diagnosis p. 788Sluggish acceleration under load with tracks not keeping up despite engine revving fine
Test each steering clutch by engaging one lever at a time; a clutch that slips only under load but holds at idle points to worn friction discs. Check clutch and brake adjustment bolts (7/16 and 13/16 wrenches) for proper linkage travel, since a maladjusted linkage can mimic disc wear. Torque the steering clutch housing cap screws to 325.44 N·m per page 75.
Manual Section: Axle and Suspension Systems p. 75Frequently Asked Questions
What is the torque specification for the main bearing cap screws on the John Deere 450D engine?
The main bearing cap screws on the John Deere 450D engine should be torqued to 115 N·m (85 lb-ft). This specification is found in the 'Crankshaft and Main Bearings' section of the manual. p. 202
How do you fix john Deere 450D dozer pulls to one side with both steering levers fully released?
Inspect the steering clutch pack on the side opposite the pull; worn or glazed friction discs let that clutch slip under load. Remove the final drive housing to steering clutch housing cap screws, torqued to 325.44 N·m on reassembly (page 75), and pull the pack to check disc thickness and warpage. Replace discs beyond wear limits and bleed the circuit. p. 75
How do you fix track won't stop or slow down when the steering lever is pulled all the way back?
Check clutch and brake adjustment bolts (7/16 and 13/16 wrenches) for correct linkage travel; a stuck or worn brake band won't fully engage even with the lever pulled hard. Pull the steering clutch pack and measure disc pack thickness against wear limits, then bleed the hydraulic circuit. If travel is still short after adjustment, replace the friction discs.
How do you fix knocking noise from the engine block whenever oil level drops low on the dipstick?
Check oil level and do not run the engine until topped off; knocking under low oil signals worn main or rod bearings from oil starvation. Verify fuel sulfur content, since exceeding 0.5 percent requires cutting the oil drain interval by 50 percent, to 100 hours, per the maintenance schedule on page 23. Pull the oil pan and inspect bearing clearances. p. 23
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Are hydraulic system diagrams in this John Deere 450D, 455D, 450D Crawler?
A hydraulic system diagram for the John Deere 450D, 455D, 450D Crawler Bulldozer, 455D Crawler Loader is included.
