When the variable displacement pump in the traveling drive starts hunting or losing power, guesswork gets expensive; the Wacker Neuson WL38 service manual PDF, factory document 1000358251, walks you through that troubleshooting and every other system on this wheel loader across 372 pages. Hydraulic schematics trace the work hydraulics from the gear pump through the lift and tilt cylinders, while the electrical section pairs full wiring diagrams with machine control unit service. Error code tables round out the back of the book, turning a warning light into a diagnosis. Torque the M18 x 1.5 wheel nuts to 285 Nm and light-series 6 mm hydraulic fittings to 10 Nm, straight from the factory tightening tables. A loader parked over one missing spec is money leaking. Download the bookmarked, text-searchable file and the right page is open before your coffee cools.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Introduction | 11-50 | Notice on This Service Manual, Technical Data, Tightening Torques, Safety Instructions |
| Operation | 51-66 | Overview of Control Elements, Indicator Lights and Warning Lights |
| Maintenance | 67-144 | Information on Maintenance, Maintenance Overview, Lubrication Work, Fuel System, Cooling System, Hydraulic System |
| Engine | 145-176 | Complete Component |
| Cooling | 177-180 | Coolant Reservoir, Radiator, Fan Blades, Cooling System |
| Traveling Drive | 181-208 | Variable Displacement Pump, Troubleshooting |
| Axles | 209-218 | Front Axle, Rear Axle |
| Braking System | 219-234 | Service/Parking Brake, Master Brake Cylinder |
| Steering System | 235-244 | Steering Orbitrol |
| Work Hydraulics | 245-284 | Hose Installation, Gear Pump |
| Electrical System | 285-324 | Machine Control Unit, Electrical Diagram |
| Trim | 325-332 | Engine Cover, Bottom Plate, Trailer Power Outlet, Trailer Coupling, Counterweight |
| Cabin | 333-348 | Heating |
| Malfunctions | 349-372 | Error Code Lists |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Wheel nut M14 x 1.5 | 150 Nm | p. 26 |
| Wheel nut M18 x 1.5 | 285 Nm | p. 26 |
| Hydraulic screw connections (light series) 6 mm | 10 Nm | p. 29 |
| Hydraulic screw connections (heavy series) 6 mm | 15 Nm | p. 29 |
| Tightening torque for brake line threaded fittings (Shape F/FS male fitting screws with flare) | 14+2 Nm | p. 27 |
| Tightening torque for worm drive hose clamps (7.9 mm width, first-time installation) | 0.9 ± 0.2 Nm | p. 37 |
| Check the injectors | every 3000 operating hours | p. 77 |
| V-belt deflection | 10 mm (0.4 in) | p. 115 |
| Engine Output (Perkins 404D-22) | 36.3 kW | p. 15 |
| Engine Output (Deutz TCD 2.9 L4) | 55.4 kW | p. 16 |
| Maximum permissible slope | 25° | p. 16 |
| Operating pressure (Steering system) | 190 bar | p. 19 |
