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Twelve models, one factory reference: this 837-page New Holland service manual covers the 250C, 260C, 345C, 345D, 445C, 445D, 545C, 545D, 455D, 555D, 575D, and 655D Construction Tractor Loaders built from 1988 through 1994. Inside: wiring diagrams tracing every circuit from the starting system to the alternator, hydraulic schematics routing every fluid path through the tractor and loader systems, and troubleshooting procedures. You get step-by-step overhaul procedures across 11 sections, covering the 3-cylinder diesel, 4x4 and 8x8 transmissions, rear axle, PTO, steering, and cab, plus exploded views. Torque the cylinder head bolts to 160 ft. lbs. on the final pass and swap the fuel filter every 600 hours. Your machine is down. Bookmarked by section and searchable by keyword, open it on any device and get the right number before you pull a wrench.
What's Inside This New Holland 250C & variants Manual
| System | Pages | Key Topics |
|---|---|---|
| Production Date Codes | 4 | - |
| Serial Number | 5-6 | Production Date codes |
| Safety | 7-9 | - |
| Loader Arm Support | 10 | - |
| Backhoe Safety Lock | 11 | - |
| Engine | 12-84 | 3-Cylinder Diesel Engine, Description and Operation, Overhaul, Cooling System, Troubleshooting, Specifications and Special Tools, Special Tools |
| Fuel System | 85-130 | Fuel System - General, Fuel Injection Pump, Injectors, Air Cleaners, Troubleshooting, Specifications |
| Electrical System | 131-201 | Wiring, Lights, Switches and Instrumentation, Battery, Starting System, Alternator and Regulator, Troublshooting, Specifications |
| Transmission | 202-427 | X 4 Transmission, X 8 Transmission, Transmission Electrical Control Circuit, Troubleshooting, Six by Four Manual Reversing Transmission, Clutch, Specifications, Special Tools |
| Rear Axle and Brake | 428-461 | Rear Axle - Description and Operation, Rear Axle Shaft Assembly - Overhaul, Planetary Reduction Gear Assembly and Axle Houseing - Overhaul, Rear Wheel Brake Assembly - Overhaul |
| Power Take-Off | 462-483 | Independent PTO, Description and Operation, Pressure Regulating Valve and Control Valve - Pressure Tests, Pressure Regulating Valve - Overhaul, Control Valve Overhaul |
| Steering and Front Axle | 484-578 | Steering, Index |
| Hydraulic Systems | 579-741 | Tractor Hydraulic System, Description and Operation, Hydraulic Power Lift, Hydraulic Lift Cylinder Assembly - Overhaul, Hydraulic Lift Cover Assembly - Overhaul |
| Cab | 742-757 | Cab Pressurizer/Heater, Cab Glass Installation, Cab Removal |
| Separating the Tractor | 758-766 | Separating the Tactor Between the Transmission and Engine and the Rear Axle, Separating the Tractor Between the Transmission and Engine |
| Accessories | 767-835 | Rear Tail/Stop Light Kit, Backup Alarm Wiring Kit, Hydraulic Pressure Tapping Maniforld, Reduction Gear Set, Reduction Gearbox Installation Instructions, Brush Guard Kit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Modulator control box overload circuit reset time | five seconds | p. 342 |
| Wheel Nuts Torque | 304-336 ft. lbs. | p. 460 |
| Cylinder Head Bolts Torque (final) | 160 ft. lbs. | p. 83 |
| Fuel Filter Change Interval | 600 hours | p. 127 |
| Fuel Filter Element Retaining Bolt Torque | 7 ft. lbs. | p. 129 |
| Engine Oil Filter Change Period (CC API Classification) | 150 hours | p. 80 |
| Engine Oil Filter Change Period (CD API Classification) | 300 hours | p. 80 |
| Hydraulic Filter Specification | 5 Micron | p. 674 |
| Hydraulic Filter Change Interval | 300 hours | p. 674 |
| Battery Capacity (Ampere Hour at 20 Hour Rate) | 128 AH | p. 183 |
| Battery Voltage | 12 | p. 183 |
| Engine Coolant Composition | 50 percent clean water and 50 percent antifreeze, premixed with 5 percent inhibitor | p. 58 |
New Holland 250C & variants Common Problems This Manual Covers
New Holland 445D hydraulic pump output low, loader bucket lifts slowly or won't raise under load p. 674
Check the hydraulic oil level and inspect the filter; replace it every 300 hours using a 5-micron element (page 674). If fluid and filter check out, verify the engine-mounted gear pump is producing the rated 8.1 U.S. Gal/Min (page 666) by performing a flow test. Low flow points to a worn pump or internal valve leakage.
Manual Section: Hydraulic Lift System TroubleshootingEngine won't crank or turns over slowly in cold weather, no start
Verify the 12-volt battery (page 183) is holding a full charge and load-test it before condemning the starter. Clean all cable connections and torque the terminals to 4-6 ft. lbs. (page 184). If the battery tests good but cranking remains slow, work through the starting system troubleshooting procedures for relay and solenoid faults.
Manual Section: Electrical System Troubleshooting (Starting System)Tractor drive feels weak or sluggish under load, slow acceleration, torque converter hesitation p. 419
Check the transmission fluid level against the 48.3 U.S. Qt. capacity spec (page 419) and inspect for contamination or a burnt smell. Low or dirty fluid directly kills torque converter pressure. If fluid is correct, trace the electrical control circuit per Section 4 troubleshooting: start with the power-up test and check for harsh or sluggish shift engagement faults.
Manual Section: Transmission Hydraulic System Diagnosis GuideTemperature warning light comes on during work, engine running hot or overheating
Check coolant level and verify the mix is 50% clean water, 50% antifreeze, with 5% inhibitor (page 58). If coolant is correct, inspect the radiator core and screen for debris blocking airflow. A plugged air pre-cleaner will also restrict cooling; overheating diagnosis steps are in the engine troubleshooting procedures starting.
Manual Section: Engine System TroubleshootingEngine loses power, runs rough, or hard starts after machine has been sitting p. 127
Replace the fuel filter if it is past 600 hours (page 127), then bleed the fuel system to clear any air trapped during storage. Inspect the sediment bowl for debris. If the engine starts then dies, verify the injection pump shutoff valve is fully open and fuel is reaching the pump per the Section 2 fuel system troubleshooting procedures.
Manual Section: Fuel System Troubleshooting (Diesel Engines)Frequently Asked Questions
How do I reset the hydraulic system on a New Holland 445D?
To restore normal hydraulic system operation, ensure the hydraulic oil in the rear axle is of the correct grade and quantity, and that the hydraulic oil filter has been changed. After any hydraulic hose disconnection, purge air from the system by running the engine at 1200-1500 RPM and actuating the loader control levers for approximately 15 minutes, then check the hydraulic system oil level and add oil if necessary.
What are the torque specs for wheel nuts on a New Holland 545D?
The torque specifications for wheel nuts vary by location and drive type. Rear axle wheel nuts should be tightened to 304-336 ft. lbs. (412-456 N·m). For two-wheel drive front axles, the wheel nuts are 130 ft. lbs. (176 N·m), and for front-wheel drive axles, they are 200 ft. lbs. (270 N·m).
How do I reset the transmission warning light on a New Holland 345D?
The transmission warning light indicates overheating of the oil. To make the light go out, check that the oil level is correct, place the transmission in neutral, and run the engine at 1000-1200 RPM until the warning light goes out. If the light remains on, investigate for a defective temperature sending unit or a short circuit.
What are the replacement specifications for fuel filters?
The fuel filter change interval is specified as 600 hours. Additionally, if using diesel fuel with a sulfur content below 1.0%, the oil and filter change interval must be reduced to 150 hours, and to every 50 hours if sulfur content is between 1% and 1.3%.
How quickly can I access this New Holland 250C & variants manual after buying?
You get a 837-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, bring it right to the shop floor.
Is this New Holland 250C & variants Service Manual printable?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this New Holland 250C & variants manual include wiring diagrams?
Yes, this New Holland 250C & variants Service Manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy text throughout the manual. The text quality is generally crisp and readable, though some smaller labels within diagrams may appear less sharp upon zooming. Diagrams and illustrations are raster images, meaning they may pixelate at higher zoom levels, but their content and labels remain largely discernible. Pages are mostly clean, with occasional minor scan artifacts and slight skewing on some pages. All pages contain content relevant to the manual, with no notable blank or filler pages.
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