Part of the New Holland Repair Manuals.
Setting up the track tensioner device, idler and rollers on a New Holland DC150 dozer crawler is one of the jobs set out across the 312 pages of this New Holland DC150 service manual PDF, OEM ID 60402262. Electrical wiring diagrams trace the circuits through the fuses, main switch, engine starting switch, starter motor and instrument panel monitor senders, while hydraulic schematics map oil flow through the transmission and the brake and steering clutch circuits. Troubleshooting guidance starts in Generalities, next to the Table of Tightening Torques. Fit transmission delivery filters rated at 25 micron and steering delivery filters at 30 micron, and keep engine intake restriction within 635 mm (25 in) H2O at rated speed and load. Your job might be the final drives, or the steering clutches and brakes. Each page prints cleanly as a working copy, and bookmarks plus a searchable text layer get you to the right section before you print.
What's Inside This New Holland DC150 Manual
| System | Pages | Key Topics |
|---|---|---|
| Generalities | 14-47 | Safety Rules, Table of Technical Data, Troubleshooting, Units of Measure, Classification of Standard Components, Table of Tightening Torques |
| Engine | 48-59 | Series B Engine Specifications, Engine Identification, Design Features, Engine Mounting |
| Transmission | 60-129 | Torque Converter, Transmission Housing, Propeller Shaft, Modulating Valves, Pressure Relief Valve |
| Final Drives | 130-153 | Final Drive, Housing Cover, Driven Gear, Driving Gear Shaft, Front Seals |
| Brakes and Steering Clutches | 154-221 | Feeding Pump, Feeding Valve Block, Proportional Solenoid Valves, Brake Pedal Valve, Bevel Gear Unit |
| Undercarriage | 222-253 | Track Chains, Idler, Support Rollers, Bottom Rollers, Track Tensioner Device, Cross-Member Pivots |
| Dozing Equipment Hydraulic System | 254-288 | Hydraulic Oil Reservoir, Equipment Hydraulic Pump, Hydraulic Control Valve, Blade Lifting Control Cylinder, Ripper Cylinder |
| Electrical System | 289-312 | Fuses, Main Switch, Engine Starting Switch, Starter Motor, Instrument Panel Monitor, Monitor Senders |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Steering system filters suction filtering capacity | 100 micron | p. 33 |
| Steering system filters delivery filtering capacity | 30 micron | p. 33 |
| Transmission filters suction filtering capacity | 100 micron | p. 32 |
| Transmission filters delivery filtering capacity | 25 micron | p. 32 |
| Maximum allowable restriction on intake at rated speed and load with clogged cartridge | 635 mm (25 in) H2O | p. 50 |
| Battery | 2 x 12 V - 100 Ah | p. 31 |
| Alternator | 24 V - 70 A | p. 31 |
| Main control valve safety valve setting | 190 bar (2698 psi) | p. 34 |
| Lube pressure at low idle | 0.69 bar (10 psi) | p. 50 |
| Lube pressure at setting speed | 2.07 bar (30 psi) | p. 50 |
| Quantity of oil to fill final drives | 38 litres (10.04 US gal) | p. 132 |
| Main pressure relief valve setting | 190 ± 5 bar (2755 ± 72.5 psi) | p. 276 |
New Holland DC150 Common Problems This Manual Covers
New Holland DC150 transmission low lube oil pressure, indicator light stays ON with engine running
Check the dipstick and top up transmission oil to the prescribed level following page 68. If the oil is foaming, hunt for an outer crack seeping air into the pump. Clean the torque converter pump suction filter, change or clean a defective hose, and drain and refill if the oil is the wrong type.
Manual Section: Transmission Troubleshooting p. 68Transmission heat exchanger clogged or oil level low, transmission oil temperature running high
Check the dipstick first and top off with prescribed oil to the correct level. Measure the temperature differential between heat exchanger inlet and outlet following page 70. A clogged unit shows only a marginal difference, so clean or replace the heat exchanger. If operating pressure measures low, work through the low oil pressure remedies on page 69.
Manual Section: Transmission Troubleshooting p. 70Machine does not stop with both steering clutch and brake levers fully actuated
Install four pressure gauges on the brake and steering clutch control valve with the engine stopped. Page 182 says disconnect and connect lines only with the engine inoperative and wear goggles. If both sides read low, check for a clogged suction filter, verify steering pump delivery of 50 Lt/min (13.21 US gpm) at 2000 rpm, and confirm the safety valve is not seized open (25 bar, 362.5 psi), per page 175.
Manual Section: Steering Clutches Troubleshooting p. 175Machine hesitates to start moving when the brake central pedal is released
Measure transmission pump flow with a flow meter installed between the torque converter and heat exchanger, and compare it to the 66 l/min (17.47 US gpm) at max. speed spec on page 32. Make that hookup with the engine inoperative and goggles on, as page 182 warns. Remove and inspect the brake valve for stiffened plungers or a fractured main spring, and check the transmission safety lever is fully open.
Manual Section: Steering Clutches Troubleshooting p. 175Dozing equipment hydraulic system with all blade and ripper cylinders operating slowly
Lower the equipment to the ground, shut off the engine, cycle the levers with no load, and loosen then re-shut the reservoir cap before opening connections (page 274). Run the flow test from page 264: a 15% pressure drop from no load through test load means a worn pump, replace it. Low flow and low pressure means re-set the main pressure relief valve to 190 ± 5 bar (2755 ± 72.5 psi) per page 276.
Manual Section: Dozing Equipment Hydraulic Troubleshooting p. 264Dozing equipment blade does not stay in the position selected after the control lever is released
Check the reservoir oil level and refill with oil of the prescribed type. Lower the blade, stop the engine, cycle the levers and loosen then re-shut the reservoir cap before opening lines (page 274). Flow test the cylinders following page 265 and replace the piston seal if one fails; if a new circuit safety valve does not cure it, replace the control valve. Bleed air from the cylinders and replace stuck-open stroke-end valves.
Manual Section: Dozing Equipment Hydraulic Troubleshooting p. 265Frequently Asked Questions
What do the error codes on the New Holland DC150 display mean?
The display shows a speed engaged digit followed by an 'E' and a three-digit failure code. For example, code 024 indicates two failed components: the 'First speed' solenoid (016) and the 'Reverse speed R' solenoid (008). Refer to Table 1 on page 176 or Table 2 on page 177 to identify the specific failed component(s) based on the code. p. 176
How can I troubleshoot hydraulic problems on a New Holland DC150?
Troubleshooting involves testing the hydraulic system using a flow meter (P/N 75298406). For slow operation, perform a flow test; if the test proves a pressure drop of 15% from no-load through test load, the pump must be replaced. Detailed troubleshooting tables for hydraulic issues are provided in Section 6, pages 264-267. p. 264
What are the replacement specifications for the transmission oil filters on the New Holland DC150?
The transmission delivery filter uses a paper element that must be replaced every 500 hours of operation. It should be tightened to 4 daNm (29.5 ft lbs) and has a by-pass valve set at 2.5 bar (36.25 psi). The suction filter uses a steel mesh element that should be cleaned every 1000 hours. p. 128
What is the correct torque for the engine mounting screws on the New Holland DC150?
The engine is secured to the frame using several screws with specific torque requirements. For example, the screw (16 x 1.5 x 50) must be tightened to 32.5 to 35.5 daNm (239.69 to 261.81 ft lbs), and the screw (24 x 2 x 80) requires 41 to 45 daNm (302.38 to 331.88 ft lbs). p. 58
What is the valve clearance specification for the Cummins 6BT 5.9 engine in the New Holland DC150?
For the Cummins 6BT 5.9 engine, the intake valve clearance is 0.25 mm (0.009 in) and the exhaust valve clearance is 0.51 mm (0.020 in). p. 50
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