Part of the New Holland Repair Manuals.
Looking for a reliable W90 service manual PDF? All 272 pages of this New Holland Construction LW90 Wheel Loader Service Manual (OEM #75131004) focus on one thing: getting your New Holland LW90 back to factory condition. Inside, you get complete hydraulic schematics detailing oil circuits and priority valves, plus full wiring diagrams covering the logic board and cab instrument cluster. Open up the troubleshooting sections to diagnose transmission faults, then use the extensive test values and assembly clearance charts to rebuild the bucket boom and frame pivot pins. Dial in your hydraulic pressures by setting the accumulator safety valve to 120 bar and the main pressure relief valve at 210 ± 5 bar. Dead equipment drains the budget. Download this bookmarked file, jump straight to the exact spec on your phone or tablet, and get the loader back to work.
What's Inside This New Holland LW90, New Holland Construction LW90, W90 Manual
| System | Pages | Key Topics |
|---|---|---|
| Summary | 4-17 | Specifications, Capabilities and Fluid Types, Safety Rules, Units of Measure Used in the Manual, Tightening Torques |
| Engine | 18-45 | General Description, General Characteristics, Specifications and Assembly Clearances, Fuel Injection Pump Specifications, External Views, Engine Supports |
| Transmission - Torque Converter | 46-90 | Torque Converter, Charging Pump, Converter Housing, Oil Circuit |
| Transmission - Gearbox & Gears | 91-130 | Gearbox, Gear Shafts, Clutches, Shift Control, Powershift |
| Transmission - Driveline & Axles | 131-159 | Drive Shafts, Differential, Final Drive, Axles, Wheel Hubs |
| Braking System | 160-183 | General Description, Operation, Disc Brake, Brake Pedal Valve, Parking Brake Control Valve, Parking Brake, Other Components, Brake Pedal Valve Hydraulic Connections |
| Steering System | 184-201 | General Description, Principles of Operation of Main Priority Valve, Steering Valve (Orbitrol) |
| Bucket Booms and Frame | 202-209 | Load Handling System, Boom, Bellcrank and Bucket, Frame Pivot Pins |
| Attachment Hydraulic System | 210-243 | General Description, Oil Circuit, Hydraulic System Pump, Attachment Control Valve, Control Valve Controls, Hydraulic Oil Reservoir, Cylinders, L.T.S. Anti-Pitch System |
| Electrical System | 244-261 | Safety Rules, General Lay-Out of Electrical System, Logic Board, Connectors, Cab Instrument Cluster, Switch Panel, Gearshift Control, Components on Machine |
| Cab | 262-272 | General Description, Windscreen Wipers and Washers, Heater, Glasses, Repair |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Accumulator safety valve setting | 120 bar | p. 6 |
| Pressure relief valve setting | 210 ± 5 bar | p. 6 |
| Accumulator pre-charge check frequency | every year | p. 240 |
| Engine Net Power | 63 KW | p. 5 |
| Engine Total Displacement | 3908 cm³ | p. 5 |
| Wheel Tightening Torque | 86 daNm | p. 5 |
| Battery Voltage and Capacity | 12 V - 100 AH | p. 42 |
| Max. Working Pressure (Braking System Accumulator) | 210 bars | p. 173 |
| Boom Cylinder Rod Stroke | 760 mm | p. 234 |
New Holland LW90, New Holland Construction LW90, W90 Common Problems This Manual Covers
New Holland LW90 torque converter slips under load, engine revs high but travel speed stays slow
Check the torque convertor troubleshooting chart for stall-speed and pressure test values. Confirm engine output holds near the rated 63 KW net power spec on page 5 before condemning the convertor. Drain the convertor pump screen and inspect for metal debris, then re-check charge pressure per the chart before road-testing under load.
Manual Section: Torque Convertor TroubleshootingEngine cranks slowly and won't start in cold weather even after the pre-heat lamp cycles
Verify battery condition first; these units run a 12V, 100 AH battery per page 42, so load-test it before chasing the glow plug circuit. Check pre-heat resistor continuity and cycle time against the diagnostic test values on page 29. Replace any resistor reading open or out of spec, and confirm cranking amperage stays steady through a full glow cycle.
Manual Section: Engine p. 29Brake pedal feels spongy with reduced stopping power and warning lamp stays illuminated
Check accumulator pressure with a gauge tee; the system is rated for a max working pressure of 210 bars per page 173. If the gauge reads low, isolate the accumulator and inspect the charging valve for leakage before condemning the pedal valve. Bleed the circuit and re-test pedal travel, then replace the accumulator if it won't hold charge above spec.
Manual Section: Braking System p. 173Boom lift cylinder rises slowly and won't reach full extension under load
Check the attachment hydraulic circuit starting on page 210 for pump output and relief settings. Extend the boom fully and measure rod travel against the rated 760 mm stroke listed on page 234; short travel points to internal cylinder bypass. Inspect the rod seals for scoring, replace as needed, and bleed trapped air from the circuit before retesting under load.
Manual Section: Attachment Hydraulic System p. 210Front wheel lug nuts work loose or the wheel wobbles noticeably during travel over rough ground
Torque the wheel nuts to the specified 86 daNm rating listed in the technical specifications on page 5; under-torqued lugs are the most common cause of wobble. Inspect the wheel studs for elongation or thread damage, replace any stretched studs, and re-torque in a star pattern. Re-check torque again after the first 50 hours of operation.
Manual Section: Summary p. 5Frequently Asked Questions
How to reset the New Holland W90 wheel loader error code?
The manual does not describe a general procedure to "reset" error codes for the entire wheel loader. Instead, it provides troubleshooting tables that link specific fault types and warning lamp indications to their possible causes and remedies. Resolving the underlying mechanical or electrical issue is the implied method for clearing the fault indication.
What do I get after purchasing this New Holland LW90, New Holland Construction?
This is a 272-page searchable PDF (7 MB) ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this New Holland LW90, New Holland Construction LW90, LW90 Wheel Loader?
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.
Are hydraulic system diagrams in this New Holland LW90, New Holland?
Yes. The manual includes hydraulic circuit diagrams, system schematics, and component specifications with pressure ratings.
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