Travel drive, work hydraulics, axles, braking, steering, and the full electrical system: the Wacker Neuson WL34 service manual PDF (OEM 1000373602) walks each one end to end across 348 pages of factory repair data for this wheel loader. Hydraulic circuit diagrams cover the HDM19/3 and HDM19/4 valve configurations, hose routing pages split machines above and below serial number 3025887, and electrical schematics trace the CAN bus, power supply, and both the Perkins and Deutz engine harnesses. A troubleshooting section works through drive faults from no forward travel to weak traction force. Set the pressure cutoff on the A4VG variable displacement pump to 440 bar, and gap Perkins valves at 0.2 mm before you chase a hard-start complaint. Two engine makes, three hydraulic variants, one loader. Bookmarks in the text-searchable file drop you on the right circuit diagram in seconds.
What's Inside This Wacker Neuson WL34 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 3-48 | Notice on This Service Manual (Use of the Service Manual, Explanation of Symbols and Abbreviations, Repair Instructions) |
| Operation | 49-56 | Overview of Control Elements, Indicating Instruments, Loader Unit Control Lever, Overview of Rotary Switches, Overview of Switch Panels, Indicator Lights and Warning Lights |
| Engine | 135-158 | Perkins Engine 404D-22 (Overview, Adjust Idle Speed, Starter, Alternator), Perkins Engine 404F-22 (Overview), Deutz Engine TD2011 L04w (Overview, Lube Oil System), Fuel Tank |
| Cooling | 159-162 | Radiator, Fan Blades |
| Travel Drive | 163-190 | Traveling Drive Hose Routing, M-Drive Hose Routing |
| Axles | 191-200 | Front Axle (Overview), Rear Axle (Overview), Type Label – Front/Rear Axle |
| Braking System | 201-214 | Overview, Service/Parking Brake (Overview, Drum Brake Setup, Change Brake Jaws/Wire Rope Adapter, Exchange the Spring-Loaded Cylinder, Bowden Cable for the Fixed Brakes) |
| Steering System | 215-226 | Hose Routing, Steering Wheel, Steering Column, Steering Column Gas Strut, Remove/Install Steering Cylinder, Steering Orbitrol S1 (Overview), Checking the Steering Hydraulics |
| Work Hydraulics | 227-260 | Overview, Vehicles with a Serial Number < 3025887 |
| Electrical System | 261-348 | Fuses, Fuse Assignment, Machine Control Unit (Disassemble, Install), Joystick (Overview), Battery Master Switch |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Valve clearance Perkins Series 400 | 0.2 mm | p. 68 |
| Valve clearance Deutz Series 2011 inlet | 0.3 mm | p. 68 |
| Pressure cutoff specified value | 440 bar | p. 167 |
| Starting speed specified value | 1200 to 1250 rpm | p. 168 |
| Weight of variable displacement pump A4VG40DA | 31 kg | p. 172 |
| Weight of variable displacement motor A6VM80 | 40 kg | p. 176 |
| Operating pressure for vehicles with control valve HDM 19/3 | 215 bar | p. 251 |
| Operating pressure for vehicles with control valve HDM 19/4 | 240 bar | p. 251 |
| Perkins 404D-22 Engine Output | 35.7 kW | p. 15 |
| Deutz TD 2011 Engine Output | 55.1 kW | p. 15 |
| Wheel Nut Tightening Torque (M14 x 1.5) | 150 Nm | p. 23 |
| Wheel Nut Tightening Torque (M18 x 1.5) | 285 Nm | p. 23 |
Wacker Neuson WL34 Common Problems This Manual Covers
Wacker Neuson WL34 has no forward or reverse travel, engine runs but loader will not move
Check hydraulic oil level first; the reservoir holds 65 liters. Inspect the suction filter and measure suction pressure at port S; you need at least 0.8 bar absolute, or 0.5 bar on a cold start. Work through the travel drive troubleshooting steps starting on page 184 before condemning the A4VG pump.
Manual Section: Travel Drive Troubleshooting p. 184Machine creeps or travel starts too early after releasing inching pedal, drive engagement unpredictable
Verify the engine speed at which travel engagement begins; the pump should start to swivel between 1200 and 1250 rpm, set per the procedure on page 168. Check supply pressure against the 28 bar specified value and confirm the pressure cutoff is at 440 bar. Readjust the DA control valve and inching valve instead of guessing.
Manual Section: Travel Drive Troubleshooting p. 168Weak traction force uphill, loader stalls pushing into the pile at full throttle
Test high pressure in the travel circuit with gauges fitted per the procedure on page 185 and compare your readings against the PHP value of 50 bar listed there. Confirm the pressure cutoff setting of 440 bar. If pressure will not build, inspect the coupling between engine and A4VG pump before pulling the 31 kg pump.
Manual Section: Travel Drive Troubleshooting p. 185Bucket cylinders slow to lift, lift arms drift down under load once oil warms up
Test operating pressure at the control valve; machines with the HDM 19/3 valve should show 215 bar and HDM 19/4 units 240 bar, both listed on page 251. Check oil level against the 65 liter reservoir capacity and inspect the suction filter. Adjust the main relief before blaming cylinder seals or the loader valve.
Manual Section: Work Hydraulics p. 251Engine cranks but starts hard, runs rough and down on power when warm
Check and adjust valve clearance; Perkins Series 400 engines take 0.2 mm set cold, per the spec on page 68. Verify oil level and grade against the 8 liter capacity for the Perkins 404D-22. Then follow the engine section starting on page 135 for starter, alternator and fuel supply checks.
Manual Section: Engine p. 68Frequently Asked Questions
What is the torque specification for the wheel nuts on the Wacker Neuson WL34?
The tightening torque for wheel nuts depends on the bolt size. For M14 x 1.5, the torque is 150 Nm; for M18 x 1.5, it is 285 Nm; and for M20 x 1.5, it is 400 Nm. p. 23
How do I clear or read error codes on the Wacker Neuson WL34?
Error codes are displayed on the indicating instrument. To troubleshoot, connect the Wacker Neuson diagnostic system WANDA by removing the cover cap and connecting the interface to the machine, then follow the instructions in the WANDA operator's manual. p. 273
What is the engine oil capacity for the Perkins engine 404D-22?
The engine oil capacity for the Perkins 404D-22 engine, including the filter, is 8 liters (2.1 gal). p. 71
What is the correct coolant mixture ratio for the Wacker Neuson WL34?
The coolant should be a 50/50 mixture of water and antifreeze to provide protection down to -37°C (-34.6°F). p. 18
What is the correct V-belt tension for the fan belt?
The V-belt tension is correct if the belt can be deflected by no more than about 10 mm (0.4 in) when pressed with your thumb between the pulleys. p. 105
How is this Wacker Neuson WL34 Service Manual delivered?
Instant PDF download. You get the full 348-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Is this Wacker Neuson WL34 manual print-friendly?
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.
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