1999–2005 New Holland LS160 & LS170 Skid Steer Loader Service & Repair Manual

This New Holland service manual covers maintenance, diagnosis, and repair of the 1999–2005 LS160 and LS170 skid steer loaders, including the N844 and N844T engines.

• Engine overhaul: Engine removal, cylinder-head service, piston and crankshaft inspection, camshaft work, reassembly, and checks after overhaul.

• Fuel and cooling systems: Injection spill timing, injector service, fuel-pump and shutoff-solenoid testing, thermostat checks, water-pump service, and LS170 turbocharger repair.

• Hydrostatic transmission: Pump and motor pressure, case-drain, and efficiency tests; internal overhaul, motor shimming, neutralizer service, and drive-control adjustment.

• Loader hydraulics: Main control valve, hydraulic gear pumps, boom and bucket cylinders, spool-lock solenoids, and standard or optional high-flow system service.

• Final drive and brakes: Gearbox rebuilding, axle-bearing and seal replacement, drive-chain and sprocket service, and parking-brake caliper inspection and adjustment.

• Electrical diagnosis: Electronic Instrument Cluster (EIC), Advanced Warning System, diagnostic and setup modes, interlock circuits, and alternator and starter repair.

• Boom, frame, and cab: Cab tilting, ROPS removal, boom-link and mounting-plate repairs, pivot-pin identification, and cab heater/defroster service.

This manual suits technicians experienced with diesel engines and hydraulic systems who have access to pressure and flow test equipment, precision measuring tools, and suitable lifting equipment.

Engine Inspection, Fuel Timing, and Cooling

Engine inspection tables cover valve-seat depth, ring gaps, piston-skirt diameters, and bearing clearances. Separate torque tables address standard hardware and internal engine fasteners.

The fuel section distinguishes timing adjustment and injector work from internal injection-pump service, which it assigns to fuel-equipment specialists. LS170 turbocharger coverage includes shaft-clearance inspection, disassembly, and reassembly.

Cooling-system procedures cover the radiator, water pump, and thermostat. The cab-heater section also explains the LS170 heater circuit’s connection to the engine oil cooler.

Hydrostatic Testing and Hydraulic Rebuilding

Weak drive diagnosis: Separate pump and motor case-drain tests help distinguish internal leakage in a drive motor from a pump fault. Cleaning and startup procedures address the hydraulic system after component failure or rebuilding.

Configuration differences: Hydrostatic pump assemblies are identified as 78364-RAV without high flow and 78364-RAW with high flow. The bucket-cylinder section distinguishes two designs with different rod lengths and noninterchangeable repair parts, helping identify the correct seal kit before rebuilding.

Motor assembly: The shimming procedure specifies gauge block XDB-1756 or 74600-624. It also warns that forcing the back plate into place can damage the pivot, pilot, or spider plate.

Gear-pump flow testing and control-valve inspection are covered separately. The pump test section explains how an incorrect tester connection can bypass relief protection and damage the pump.

EIC Troubleshooting and Circuit Diagrams

EIC coverage includes fault history, circuit checks, engine-code selection, and RPM-display calibration. Connector tables distinguish EIC board pins from harness pins and identify wire colors.

Illustrations include the Engine Components Electrical Diagram, Fuel System Electrical Diagram, and High Flow Hydraulic Oil Flow Diagram. Alternator sectional views and machine dimensional drawings supplement the wiring and exploded assembly views.

Electrical diagram limitation: The general Electrical Diagram sheets on PDF pp. 495–496 are blank. Individual circuit diagrams and connector tables are included elsewhere in the manual.

Boom Access and Attachment Fit

The cab-and-boom tilt procedure specifies cab tilting tool 86590084. Mounting-plate inspection covers worn or bent latch pins and attachment fit, while the frame section documents ROPS removal and reinstallation.

Before teardown, review the manual’s safety guidelines for boom-lock support, cab tilting, and hydraulic pressure release.

A Sample of Valve and Piston Ring Specifications

These values are a small selection of the engine inspection and adjustment data in the manual.

For both N844 and N844T engines, intake and exhaust valve clearance is 0.2 mm (0.008 in.) cold. The No. 1 piston ring has a standard end gap of 0.20–0.35 mm, with 1.0 mm listed as the allowable limit.

Text Search, Section Bookmarks, and Included Pages

Search and diagram detail: Main text is searchable, while some diagram labels and the introductory page are not. Embedded bookmarks link to all 13 main sections. Small wiring labels and connector numbers require zooming.

Delivered as one printable, 742-page PDF: 741 manual pages across 13 main sections, including the original blank pages, plus one introductory page already counted in the total.