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Part of the New Holland Repair Manuals.
This 337-page New Holland D255 Workshop Manual (OEM #604.13.527.00) covers every system on your D255 Crawler Dozer, from the torque converter transmission down to the final drives. You get wiring diagrams for the electrical system, hydraulic schematics for the dozer blade circuit, and a full troubleshooting section for the steering clutches and brakes. Open to the undercarriage chapter and you get complete track chain, idler, and roller specs alongside the dozer equipment hydraulic pump and control valve breakdown. Torque the master link to 27-39 daNm plus an additional 180 degrees of rotation, and set the hydraulic relief valve between 980 and 1030 bar before you button the machine back up. No more flipping through three different sub-manuals hunting for one torque spec. This PDF carries bookmarks for every section, so you jump straight from the cover to Air Conditioning without scrolling, right from your phone in the shop.
What's Inside This New Holland D255 Manual
| System | Pages | Key Topics |
|---|---|---|
| Generalities | 5-40 | Safety Rules, Technical Data Tables, Diagnostic Checks, Measure Units, Classification of Standard Parts, Tightening Torques |
| Engine | 41-54 | General Specifications, Diagrams of Series "C" Engine |
| Transmission-Torque Converter | 55-130 | Troubleshooting, Converter, Gearbox, Transmission Distributor, Control Lever, Testing Transmission/Converter on the Vehicle, Technical Data, Tightening Torques |
| Steering Clutches - Brakes | 131-191 | General Description, Troubleshooting of Major Malfunctions, Central Reduction Bevel Gear Set, Steering Clutches and Brakes, Steering Clutches and Brakes Control Valve |
| Final Drives | 192-211 | Removal, Disassembly |
| Undercarriage | 212-247 | Track Chains, Track Release and Adjuster Mechanism, Track Idler Wheels, Track Rollers, Track Frames, Specifications and Data |
| Dozer Equipment Hydraulic System | 248-283 | Hydraulic Pump, Distributor, Blade Raising and Lowering Control Cylinders, Technical Data |
| Electrical System | 284-313 | Fuses, Electrical System Master Switch, Starter Motor, Alternator, E.D.M. Control Module, Wiring Diagram |
| Air Conditioning Unit | 314-337 | Service Precautions, Leak Inspection, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| TIGHTENING TORQUES | 23 | p. 5 |
| DIAGNOSTIC CHECKS | 21 | p. 5 |
| tightening torque of master link | 27 ÷ 39 daNm plus a further tightening of 180° | p. 244 |
| Relief valve pressure setting | 980 ÷ 1030 bar | p. 241 |
| Engine Total Displacement | 8268 cm3 | p. 19 |
| Engine Oil Total Capacity | 23.8 litres | p. 45 |
| Cooling System Capacity | 9 litres | p. 46 |
| Fuel Tank Capacity | 495 Liter | p. 26 |
| Main Hydraulic Pump Relief Valve Pressure | 190 bar | p. 22 |
| Transmission Pressure (at 66 l/min flow) | 17.0 bar | p. 28 |
| Steering Clutch N. of Friction Discs | 11 | p. 20 |
| Track Shoe Width | 550 mm | p. 18 |
New Holland D255 Common Problems This Manual Covers
New Holland D255 crawler dozer sluggish in all forward and reverse gears, low power on hills
Check the troubleshooting procedures first for likely causes. Verify transmission feed pressure at the test port; spec calls for 17.0 bar (246.6 PSI) at 66 l/min flow per page 28. Low pressure points to a worn pump or clogged suction filter; replace the filter element and retest before condemning the converter.
Manual Section: Transmission-Torque Converter TroubleshootingMachine does not stop or turn properly even with steering levers fully engaged
Check the steering clutches and brakes section starting page 131 for control valve pressure specs. Inspect the steering clutch friction discs; each clutch pack uses 11 friction discs per page 20 and uneven engagement usually means one or more discs are glazed or worn thin. Bleed the control valve linkage and adjust brake pedal free travel before road-testing.
Manual Section: Steering Clutches - Brakes Troubleshooting of Major Malfunctions p. 131Track chain links, pins, and bushes wearing out much faster than expected
Check the undercarriage troubleshooting notes on page 212 for track tension and alignment causes. Measure track sag and confirm the machine isn't running long stretches on steep side slopes, which accelerates pin wear. Torque master link screws to 27 to 39 daNm plus an additional 180 degrees per page 244, and replace worn bushings rather than reusing them.
Manual Section: Undercarriage Troubleshooting of Major Malfunctions p. 212Blade descends rapidly on its own with the control lever in neutral hold position
Check the dozer equipment hydraulic system section from page 248 for cylinder seal and valve leakage checks. Isolate the blade cylinders and time the drift; spec allows no more than 1 mm per minute of unpowered descent. Faster drift means worn lift cylinder seals or the main security valve, set at 190 ± 7 bar per page 268, needs replacing.
Manual Section: Hydraulic System (Angledozer Equipment) Troubleshooting p. 248Air conditioning blows warm air with compressor cycling but cabin never cools down
Check the air conditioning troubleshooting guide starting page 314 for compressor cycling and airflow faults. Confirm refrigerant charge against the system spec of 2350 grams maximum listed on page 316; overcharging trips the high pressure cutout and undercharging starves the evaporator. Check for a slipping compressor clutch or a stuck expansion valve before recharging the system.
Manual Section: Air Conditioning Unit Troubleshooting p. 314Frequently Asked Questions
What are the torque specifications for the New Holland D255 track shoe screws and master links?
For the New Holland D255, the screws securing the track shoes should be tightened to 86 ÷ 102 daNm. The screws for securing the master links require a torque of 27 ÷ 39 daNm, followed by an additional tightening of 180°. p. 244
What are the indicators for the E.D.M. Control Module on the New Holland D255 crawler dozer?
The E.D.M. Control Module on the New Holland D255 indicates various system statuses, including Transmission oil low pressure, Engine lube oil low pressure, Transmission oil insufficient level, Engine oil insufficient level, Engine coolant insufficient level, Battery charge system abnormal operation, Engine coolant max. temperature, Transmission oil max. temperature, General indicator, Engine air cleaner clogging, Hydraulic oil filter clogging, and Fuel level. These indicators are displayed via L.E.D.s on the panel. p. 304
How do you replace a damaged link in the track chain of the New Holland D255?
To replace a damaged link not adjacent to a master link, first remove the shoe attached to the link and the adjacent shoes. Then, use a portable press (380001019) with appropriate tooling (fig. 5-3) to pull out pins (3 and 4, fig. 5-4) pivoting the damaged link. Cut a 20 ÷ 30 mm section of the bush (5, fig. 5-4) with a torch, remove the damaged link (2), and pull out the remaining bush section from link (6). Finally, install a new master bush (9) on a new link (11) and secure it to the chain, then reassemble the second link (6) on the master bush and complete the operation by reassembling pins (3 and 4). p. 218
How do you diagnose hydraulic system issues on the New Holland D255 when the hydraulic cylinders move very slowly?
If the hydraulic cylinders move very slowly, first check the hydraulic pump flow using a flowmeter on the feed circuit; it should be more than 212 litres per minute at 190 bar pressure with the engine at 2000 rpm and oil above 70 °C. If the flow is normal, check the setting of the pressure valve on the equipment distributor, which should be 190 bar. If it is low, set it correctly and check the speed of the cylinders. p. 254
Is this New Holland D255, D255 Crawler Dozer manual a digital?
Immediate download of the complete 337-page searchable Workshop Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this New Holland D255, D255 Crawler Dozer?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Can I find hydraulic circuit diagrams in this New Holland D255, D255 Crawler?
Yes, complete hydraulic schematics with flow diagrams, valve configurations, and pressure specifications are included.
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