Part of the New Holland Repair Manuals.
Looking for a New Holland LS 55 service manual PDF? This 594-page factory manual (OEM #40002551) walks you through the entire 1995-1996 yard tractor line: LS 25, 35, 45, and 55. You get wiring diagrams for the fuse block, relay, and fuel level circuits, plus complete Kohler Command engine sections from 11 HP up through 22 HP. Inside: electrohydraulic lift schematics, relief valve testing, a full troubleshooting guide for engines that crank but won't start, and spindle overhaul steps for the 52-inch mower deck. Set the UP mode relief valve at 1000 psi and the DOWN mode at 400 psi, then torque your steering wheel retaining nut to 50 ft. lbs. No more chasing wiring faults with a multimeter and a prayer. The text layer is fully searchable, so you can jump to any spec, torque value or part name right from the shop floor.
What's Inside This New Holland LS 25, LS 35, LS 45, LS 55 Manual
| System | Pages | Key Topics |
|---|---|---|
| Forward | 5-6 | Supplement Usage, Production Variations, Continuous Improvement |
| Electrical System (Supplement) | 7-14 | Indicator Light Panel, Fuse Block Location, Relay Identification, Fuel Level Circuit, Engine Temperature Circuit, Wiring Diagrams |
| PTO Clutch, Brakes & Steering | 15-19 | Single Sheave Style, Output Sheave Changes, Brake Linkage Components, Brake Adjustment, Steering Wheel Torque |
| Electrohydraulic Lift | 21-40 | Lift System Components, Pump Assembly, Relief Valve Testing, Lift Cylinder Rebuilding, Lift Switch Testing |
| Specifications (LS25–LS55) | 41-58 | LS25 Specs, LS35 Specs, LS45 Specs, LS55 Specs, Mower Deck Specs, Optional Equipment |
| Mower Decks | 59-72 | 52-Inch Mower Deck, Two-Belt Drive System, Spindle Overhaul, Blade Installation |
| Kohler Engine, Specifications, Tools & Troubleshooting | 75-113 | Engine Identification, General Specifications, Special Service Tools, Troubleshooting Guide, Air Cleaner Service |
| Kohler Engine, Fuel, Lubrication & Electrical | 114-169 | Carburetor Service, External Governor, Fuel Recommendations, Lubrication System, Retractable Starter, Charging System, Ignition System |
| Kohler Engine, Disassembly, Inspection & Reassembly | 170-220 | Engine Disassembly, Connecting Rods, Crankshaft Inspection, Reconditioning Limits, Reassembly Sequence |
| Kohler CV18-22 Engine, Specifications, Tools & Fuel System | 221-267 | CV18-22 Specifications, Tolerances, Special Tools, Troubleshooting, Fuel System, Governor Adjustment |
| Kohler CV18-22 Engine, Electrical, Disassembly & Reassembly | 268-336 | Electrical System and Components, Charging System, Engine Disassembly, Inspection and Reconditioning, Reassembly |
| Tractor Electrical System | 337-382 | PTO Switch, Safety Start Circuit, Ohmmeter Testing, Wiring Diagrams, Component Location |
| PTO Clutch | 383-390 | PTO Clutch Service, Sheave Removal, Adjustment |
| 820 Series Transaxle | 391-422 | Input Shaft Disassembly, Gear Service, Transaxle Assembly |
| Model K61A Tuff Torq Hydrostatic Transaxle | 423-494 | N-Centering Sub-Assembly, Case Service, Hydrostatic Unit Overhaul, Packing Replacement |
| Steering, Front Axle & Lift Linkage | 495-522 | Wheel Bearings, Front Axle Service, Steering Components, Lift Lever Linkage Adjustment |
| Specifications | 523-550 | Torque Values, Service Specifications, Clearances |
| Mower Decks | 551-594 | Mower Deck Adjustments, Spindle Service, Belt Routing, Deck Removal, Index |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Pump output | 0.23 gallons per minute at 500 psi | p. 26 |
| UP mode pressure relief valve | 1000 psi | p. 26 |
| Steering wheel retaining nut torque | 50 ft. lbs. | p. 19 |
| Spindle pulley retaining nut torque | 80-100 ft. lbs. | p. 72 |
| LS 25, LS 35 | ||
| Battery (LS 25 / LS 35) | NH F300, 235 CCA @ 0°F | p. 373 |
| LS 45, LS 55 | ||
| Battery (LS 45 / LS 55) | NH F350, 300 CCA @ 0°F | p. 373 |
| LS 55 | ||
| Lift cylinder locknut torque | 20-25 ft. lbs. | p. 35 |
New Holland LS 25, LS 35, LS 45, LS 55 Common Problems This Manual Covers
New Holland LS yard tractor hydraulic lift raises slowly, chatters, or stalls before reaching full height
Check lift fluid level and condition first, then test pump delivery against the 0.23 gallons per minute at 500 psi (34 bar) rating on page 26. Verify the UP relief valve holds 1000 psi; a valve stuck below spec bleeds off lift pressure. Replace contaminated fluid and inspect the pump if flow stays low.
Manual Section: Electrohydraulic Lift p. 26Engine cranks strong but will not fire, or turns over slowly on cold mornings
Test the battery and clean both cable terminals before touching the fuel system; LS 25 and LS 35 models call for an F300 battery rated 235 CCA at 0°F, LS 45 and LS 55 an F350 at 300 CCA (page 373). Check spark, then confirm fuel reaches the carburetor. Follow the cranks-but-will-not-start procedure starting on page 169, and service the starter and solenoid if cranking stays slow.
Manual Section: Section 3 - Troubleshooting p. 169Mower deck vibrates badly, squeals under load, or leaves streaks of uncut grass
Check both drive belts for glazing and correct tension, then spin each spindle by hand and feel for bearing roughness. Rebuild rough spindles per the overhaul procedure, torquing the spindle pulley nut to 80-100 ft. lbs. (109-136 N·m) per page 72, and verify blade hardware is tight before running the deck.
Manual Section: Mower Decks p. 72Steering wheel feels loose, wobbles on the shaft, or shows excessive free play at the hub
Remove the steering wheel cap and check the retaining nut; torque it to 50 ft. lbs. (37 N·m) as specified on page 19. Inspect the shaft splines for wear while the wheel is off, and check the drag link and tie rod ends for slop before reassembling.
Manual Section: Steering p. 19Lift cylinder weeps oil at the rod seal and the mower deck settles overnight
Remove the lift cylinder and rebuild it with new seals rather than replacing the assembly. Inspect the rod for scoring, replace the piston seal and head O-ring, and on LS 55 units torque the rod locknut to 20-25 ft. lbs. (27-34 N·m) per page 35. Test in DOWN mode against the 400 psi relief rating.
Manual Section: Electrohydraulic Lift p. 35Frequently Asked Questions
How do I reset the PTO/interlock safety system on a New Holland LS 25/35/45/55?
The tractor's safety start system is designed to prevent the engine from starting unless specific conditions are met. To reset or enable the system, ensure the brake pedal is depressed, the PTO switch is in the 'OFF' position, and the speed selector lever is in the 'N' or neutral position. If the operator rises from the seat while the brake pedal is released or the PTO switch is in the 'ON' position, the engine will stop. p. 40
How do I reset the New Holland LS 25/35/45/55 after replacing the battery?
After replacing the battery, ensure the battery is installed with the posts facing forward and secured with the hold-down rods. Connect the positive (+) cable first, followed by the negative (-) cable, using the bolt and plastic wing nut. No electronic reset procedure is required for the tractor's electrical system. p. 74
What are the battery specifications for the LS 25/35 and LS 45/55 models?
The LS 25 and LS 35 models use an F300 battery with 235 cold cranking amps at 0°F. The LS 45 and LS 55 models use an F350 battery with 300 cold cranking amps at 0°F. Both models use a BCI group U1 battery with dimensions of 7-3/4" (197 mm) length, 5-3/16" (132 mm) width, and 7-5/16" (186 mm) height. p. 75
What is the correct torque for the cylinder head fasteners on the LS 55 tractor?
The cylinder head fasteners on the LS 55 tractor should be torqued initially to 40% to 50% of the final torque, which is 20.35 N·m (15 ft. lb.), followed by a final torque of 40.7 N·m (30 ft. lb.) in the specified sequence. p. 61
What is the correct air gap for the ignition module on the LS series tractors?
The final air gap between the ignition module and the flywheel magnet should be set to 0.203/0.305 mm (0.008/0.012 in.). p. 62
How is this New Holland LS 25 Service Manual delivered?
Instant PDF download. You get the full 594-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this New Holland LS 25 Service Manual printable?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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