2000s New Holland LS120 LS125 Skid Steer Loader Service Manual

2000s New Holland LS120 and LS125 skid steer loader service manual, covering the Onan P218 gasoline and New Holland E673 diesel configurations.

• Engine repair: Engine removal, teardown, internal inspection, and reassembly, with separate coverage for the gasoline and diesel engines.

• Diesel fuel system: Injection-pump removal and installation, spill timing, fuel-system bleeding, governor adjustments, and injector service.

• Hydrostatic drive: Pump and motor overhaul, charge-pressure testing, system cleaning, startup after service, and transmission neutralizing adjustments.

• Implement hydraulics: Master control valve and hydraulic gear pump service, auxiliary valve and cable repairs, and boom and bucket cylinder disassembly and resealing.

• Final drive and brakes: Axle bearings and seals, drive-chain and idler replacement, chain-tension adjustments, and parking-brake testing and adjustment.

• Electrical diagnosis: Wiring diagrams, diagnostic flow charts, connector pin assignments, restraint-system tests, and model-specific starter, alternator, and ignition-system service.

Suited to mechanics familiar with engine overhaul, hydraulic pressure testing, and electrical fault tracing; several procedures require dedicated measuring and service tools.

Engine Inspection, Fuel Injection, and Cooling

Separate engine sections cover valve seats and guides, piston and ring fits, cylinder bores, crankshaft journals, and bearing clearances. Exploded views and assembly torque tables support reassembly.

The diesel section adds compression testing, head-gasket selection, water-pump service, and thermostat checks.

Fuel-system coverage includes injection-pump timing and governor adjustments, with injector inspection and nozzle service. The manual directs internal injection-pump repairs to an authorized Diesel Service Station.

Special-tool references include compression tester NH00120 and injector tester FNH 01721. The diesel Oil Flow Chart traces lubrication passages, while the P218 Service and Lubrication Chart is a partial schedule; the complete maintenance schedule is in the separate operator's manual.

Hydrostatic Transmission and Implement Hydraulics

Pump and motor procedures include component inspection and reassembly, followed by system cleaning and startup checks. Steering-control coverage extends beyond neutralizing to control-lever positioning and stop-bolt adjustments.

The master control valve section details lift-check valves, spool inspection, and seal replacement. Hydraulic troubleshooting distinguishes low pump flow, valve faults, cylinder leakage, and linkage problems when the boom or bucket moves slowly. Individual control-valve spools are not replaceable separately.

Final Drive, ROPS, and Loader Service

Axle procedures address bearing seating and adjustment as well as seals and sprockets. Both engine-stopped and engine-running drive-chain adjustment methods are documented.

The drive-belt alignment notes explain how misaligned sheaves or an idler can damage the belt. The chain-adjustment section warns that excess tension can seriously damage the final drive.

Chassis coverage includes ROPS inspection and removal, boom and attachment mounting-plate removal, boom-lockpin linkage service, and operator's seat repairs. Service precautions address raised-machine support, boom lockpins, hydraulic pressure, and electrical isolation.

Restraint Circuits and Electrical Fault Tracing

The Control Module Connector pin chart, model-specific restraint-system wiring diagrams, and LS120 and LS125 Diagnostic Flow Charts help distinguish interlock or wiring faults from starter and boom-solenoid faults.

The 12-volt negative-ground electrical sections cover separate starter and alternator repair procedures for each model. LS120 electronic ignition-module fault isolation and LS125 glow plug controller removal and installation are also included.

A Preview of Reservoir, Mounting, and Seat-Circuit Data

These examples are a small selection of the manual's fluid, fastener, and electrical service data. The shared hydraulic/hydrostatic reservoir is listed at 34 liters (9 US gallons).

The hydrostatic motor mounting specification is 89 N·m (66 ft-lb) for the 1/2 × 1-1/2-inch Grade 5 carriage bolts; smaller mounting fasteners have separate torque entries.

In the Seat Switch Wire Harness Test, two resistor-type diodes reduce return voltage by 1.2–1.6 volts below battery voltage with the ignition on and the seat switch connected and closed.

Text Search, Section Bookmarks, and PDF Contents

Search and diagram detail: Main body text is searchable, and embedded bookmarks open all ten service sections. Some diagnostic-chart text and labels within wiring diagrams are not searchable. Small wiring labels are best read with zoom.

One printable English PDF contains 563 pages: 562 manual pages, including two blank pages, plus one additional introductory page. All are included in the total.