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Part of the New Holland Repair Manuals.
Working on a dead wheel loader? This 527-page New Holland LW 50 technical manual PDF (OEM #73179329) breaks down the complete travel drive, axles, and hydrostatic working hydraulics for your machine. Inside, you get full wiring diagrams to trace electrical faults, detailed hydraulic circuit schematics, and extensive troubleshooting charts to isolate pressure drops fast. Open up step-by-step tear-down procedures covering everything from the priority steering valve to the brake accumulator and lifting cylinders. Lock down the front axle mounting with exactly 670 Nm (495 lb-ft) of torque, and verify the variable pump displacement is hitting exactly 40 cc/rev before closing the system. Wasted shop time kills your profit margin. Download this bookmarked file directly to your rugged tablet, navigate straight to the repair you need, and get that loader pushing dirt again.
What's Inside This New Holland LW 50 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-15 | Safety Instructions, Warnings and Symbols, Organizational Measures, Special Dangers, Repair Work Safety |
| Service Data | 16-55 | Si Units, Conversion Tables, Calculation Examples, Tightening Torques, Service Fluids, Approximate Weights |
| Engine | 57-70 | Engine Specifications, Repair Instructions, Assisted Starting, Welding Operations |
| Travel Drive | 71-95 | Hydraulic System Safety, Hydrostatic Drive Principle, Pressure Measuring Points, Adjustment Procedures, Hydraulic Pump Repair |
| Axles | 176-270 | Axle Design, Filling Quantities, Dismantling Procedures, Brake Assembly, Differential Assembly, Special Tools |
| Steering | 271-289 | Hydraulic System Safety, Circuit Diagrams, Functional Description, Priority Valve, Steering Cylinder, Testing and Adjustment |
| Brakes | 290-308 | Safety Instructions, Braking System Circuit, Accumulator Charging, Pedal-Type Brake Valve, Checking Brake Disks, Bleeding System |
| Working Hydraulic System | 309-333 | Hydraulic System Safety, Functional Description, Control Block, Lifting Cylinder, Dumping Cylinder, Testing and Adjustment |
| Electrical System | 334-451 | Fundamentals of Electrical Engineering, Battery Charging, Troubleshooting, Wiring Diagrams, Fuses, Terminal Designations |
| Frame | 452-457 | Frame Components, Safety Instructions, Repairing Loader Frame, Exchanging Main Pivot Parts, Mounting Procedures |
| Fittings, Pipes and Hoses | 458-507 | Safety Instructions, Materials for Lines, Pipe Couplings, Flange Couplings, Assembly Aids, Gauge Connections |
| Sealing, Protective, Testing and Cleaning Agents | 508-527 | Preservation of Gearboxes, Preservation of Piston Rods, Surface Sealing Agents, Liquid Thread Adhesives, Lubricants, Surface Crack Checking |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine - repair instructions | 10 | p. 3 |
| Working hydraulic | 08 | p. 320 |
| Front axle mounting Tightening torque | 670 Nm (495 lbft) | p. 67 |
| Rear axle mounting (Pin mounting) Tightening torque | 79 Nm (58 lbft) | p. 67 |
| Variable pump Displacement | 40 cc / rev. | p. 63 |
| Variable pump Power requirement max. | 38.5 kW | p. 63 |
| Hydraulic cylinder hoist times (shovel empty) lifting | 6 Sec. | p. 61 |
| Hydraulic oil temperature for testing and adjusting work | 60-70°C (140 - 160°F) | p. 81 |
| Pressure gauge measuring range for checking mechanical zero position | 600 bars / 8700 psi | p. 81 |
| Feed pressure limit | ca. 25 bars (360 psi) | p. 78 |
| Travelling pressure at engine speed of ca. 1100 rpm | ca. 50 bars (725 psi) | p. 78 |
| Pressure gauge measuring range for checking high-pressure relief valves | 600 bars / 8700 psi | p. 83 |
New Holland LW 50 Common Problems This Manual Covers
New Holland LW 50 brake assembly comes apart inside the final drive around 5000 hours, losing drive power
Pull the final drive and check the brake disk pack for separation or scoring. Measure inner disk thickness against page 305; replace any disk once it wears below the 4.5 mm minimum. Verify accumulator charging pressure holds at 50 bars per page 298, then bleed the lines and confirm max pedal-valve pressure reaches 60 bars as specified on page 300 before returning the loader to service.
Manual Section: Brakes p. 305Bucket moves jerky or won't lift a load even with engine running at full RPM
Check for air trapped in the lifting circuit first; crack the bleed screw at the cylinder base and cycle the boom slowly through a full stroke. Verify working hydraulic service pressure holds at 230 bars per page 323, and confirm the lift cylinder completes its full 574 mm stroke listed on page 321. If stroke time exceeds the 6.7 second spec on page 327 at max engine speed, suspect a worn pump or a failing priority valve.
Manual Section: Working Hydraulic System p. 323Engine overheats and loses power during heavy loader work in hot weather
Drain and inspect the radiator core for clogged fins, then top off coolant with the engine cold. Bench test the thermostat in heated water and confirm it opens before reaching operating temperature. Check that the cooling fan clutch engages fully, and verify engine oil pressure holds at the 2.86 bar spec on page 59; low pressure alongside overheating points to a failing oil pump or a restricted oil cooler.
Manual Section: Engine p. 59Engine cranks very slowly or completely fails to start in cold weather
Run the battery troubleshooting chart to rule out sulphation or a low acid level before condemning the starter. Load test the battery; if voltage sags below the 8 V minimum limit specified on page 350 during cranking, replace it. Check alternator charging voltage, which should read between 13 and 14.5 V on a 12 V system per page 347, and clean corroded terminals and ground cables before retesting.
Manual Section: Electrical SystemHydraulic pump makes grinding noise under load and output pressure drops during travel
Hook up gauges at the travel drive test points; feed pressure should hold near 25 bars and travelling pressure around 50 bars at 1100 rpm per page 78. If readings run low, pull the variable pump and inspect the rotary group for scoring; rated displacement is 40 cc/rev on page 63. Replace the drive shaft seal kit referenced on page 94 and bleed the circuit before road testing.
Manual Section: Travel Drive p. 78Frequently Asked Questions
What are the torque specifications for axle bolts on the New Holland LW50 wheel loader?
For the front axle, the hex nuts (M 24-8) for wheel mounting require a tightening torque of 710 Nm (524 lbft). For the axle drive assembly, fillister-head screws (M 12 - 10.9) should be tightened to 129 Nm (95 lbft) using LOCTITE 243, and collar units to 200 Nm (148 lbft) with LOCTITE 243. Hex screws (M 12 - 10.9) for the wheel hub assembly require 120 Nm (89 lbft) with LOCTITE 243. p. 183
What is the torque specification for engine mounting bolts on the New Holland LW50?
The tightening torque for the variable pump-engine mounting bolts (M 16 / 8.8 / SW 14) is 195 Nm (144 lbft). For engine bracket bolts, M 12 / 8.8 / SW 19 bolts require 79 Nm (58 lbft), and M 10 / 8.8 / SW 17 bolts require 46 Nm (34 lbft). p. 67
What are the replacement specifications for the brake assembly (final drive update) on the New Holland LW50?
The interior brake disks (84) must be replaced if they are worn down to a minimum thickness of 4.5 mm (0.18 inch). The outer disks (83) must be replaced if the surface is rough or scratched. All inner and outer disks (83 + 84) must be replaced only in sets. p. 305
What are the replacement specifications for hydraulic pump and seals on the New Holland LW50?
When performing repair work on the hydraulic pump, all seals must be replaced with original spare parts. It is important to close off exposed hose and piping connections, drill holes, and housing carefully to prevent dust from penetrating during dismantling. p. 469
What do I get after purchasing this New Holland LW 50 manual?
A 527-page Technical Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is this New Holland LW 50 Technical Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this New Holland LW 50 Technical Manual have electrical diagrams?
Yes. You'll find an electrical wiring diagram covering the main wiring layout.
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