New Holland LS140 / LS150 Skid Steer Loader Service Manual

This New Holland factory service manual covers the LS140 with the N843 engine and the LS150 with the N843H engine. The PDF contains 547 pages total: 546 pages of service-manual content plus one distributor banner page. Coverage is organized by machine and engine designation, so the model and engine tags should be checked before ordering. With internal engine repair, hydraulic testing, electrical diagnosis, and heavy-component handling throughout, it is best suited to technicians and experienced owners who have the proper gauges, lifting equipment, and shop tools.

• Engine repair and overhaul: Covers engine removal, complete disassembly and reassembly, cylinder head and valve-seat work, cylinder-block inspection, pistons and connecting rods, crankshaft and bearing holders, camshaft and timing gears, oil pump service, governor work, injection-pump installation, spill timing, fuel-system testing, and post-overhaul checks.
• Working hydraulics: Details the three-spool open-center control valve, main-system pressure testing at the boom and bucket cylinders and auxiliary couplers, boom circuit relief-valve testing, gear-pump flow-efficiency checks, hydraulic/hydrostatic air-ingress testing, spool-lock solenoid testing, and removal, inspection, repair, and installation of the control valve, gear pump, and boom and bucket cylinders.
• Axles and final drive: Includes troubleshooting and test charts, axle-housing removal, axle disassembly and inspection, chain-case and final-drive repair, primary and secondary drive-chain service, reassembly and tension checks, plus tire, wheel, and over-the-tire track information. Model-specific drive-chain data distinguishes the LS140 from the LS150.
• Electrical and EIC diagnosis: Explains the Electronic Instrument Cluster advanced warning system, automatic shutdown and interlock functions, board self-test, diagnostic and setup modes, circuit testing, sender and spool-lock inputs, fuse and relay panels, main harness removal, and alternator and starter testing, disassembly, inspection, repair, and reassembly.
• Boom, mounting plate, frame, and cab: Provides factory procedures for cab-and-boom tilting, craning the machine, cab/ROPS removal, boom lock linkage, upper and lower boom links, front pivot-hub replacement, attachment mounting-plate rebuilding, latch lever and pin repair, and loader faceplate checks.
• Named diagrams and diagnostic views: Includes the full Electrical Diagram, Engine Components Electrical Diagram, Fuel System Electrical Diagram, Heater Wiring Diagram, hydraulic neutral-flow and shifted-spool circuit views, and the final-drive power-flow layout.
• Specifications, tools, and options: Supplies component torque tables, fluid and lubricant data, wear and service limits, electrical test values, hydraulic test specifications, cycle-time data, dimensions, labor guides, heater/defroster service, counterweights, and dealer-installed accessory wiring. Listed tools include Cab Tilting Tool 86590084, oil-pressure adapter NH 00011, compression-test adapter NH 00120, and oil-pump port-block tools NH 00117 and NH 11097.

Model-Specific Detail

The manual separates the two machines where the hardware differs, including engine ratings and governed speeds, hydraulic pump output, boom-cylinder dimensions, operating-cycle data, lift ratings, and drive-chain specifications. It also identifies different factory-set boom circuit relief valves used on early and later machines and provides procedures for both hand- and pedal-controlled boom and bucket configurations.

What This PDF Does - and Does Not - Cover

This is a repair reference for the engine, working hydraulics, axles and chain final drives, electrical system, loader structure, cab/ROPS, heater/defroster, and listed accessories. Hydrostatic drive specifications, charge-pressure monitoring, system air-ingress testing, and the power path to the final drives are covered, but internal teardown or overhaul of the hydrostatic pumps and motors is not included in this PDF. New Holland also directs the reader to use this service manual with the separate operator's manual.

Two manual-specific cautions matter during repair. Attachment return oil must follow the specified path through the cooler and filter to replenish the hydrostatic charge circuit; an incorrect return arrangement can damage the hydrostatic pumps and motors. Electrical accessories must not be tapped into the cab fuse or switch wiring because backfeed can produce false EIC readings or damage the EIC board.

Raised-boom, cab-tilting, and craning work requires the prescribed supports and lifting equipment. Hydraulic pressure must be relieved before lines are opened, and the cab must not be tilted without the specified cab-tilting tool and procedure.