Wacker Neuson WL34 - Troubleshooting

4-22 SHB WL34 * 2.0
4 Travel drive
Troubleshooting
4.8 Troubleshooting
No forward or reverse travel
Connect pressure gage to measuring
points
Suction pressure S (p
S
min ≥ 0.8 bar absolute)
≥ 0.5 bar temporarily during cold start
Check supply pressure
(p
Sp
.... order-specic)
Forward-reverse spool valve energized?
Is slide switch switched?
Control pressure to "p
St
" speed-specic
order-specic
Control pressure depending on
travel direction to
X
1
X
2
as at measuring point P
St
Pressure! Without pressure?
..... *bar ..... *bar
* speed-specic
Check whether HP valves dirty?
Replace among themselves.
Bypass closed?
Pressures to M
A
/ M
B
High pressure depending on travel direction
M
A
/ M
B
Pressure dierence between M
A
/ M
B
Replace the variable displacement pump,
Mechanical damage
Check
- Oil level too low
- Suction line is free
- Suction line interrupted
- Suction lter dirty
- Malfunctioning coupling
- A4VG wrong direction of rotation
Suction line measuring
point before
pump input
Wrong direction of rotation
Malfunctioning auxiliary pump
- Replace
- Replace the pump
Check
- Replace
- Clean
Check
- Inching valve (inched)
- Rotary inching valve
- Incorrect adjustment of control valve (DA)
(see Machine travel starts too early)
- Incorrect adjustment of pressure cuto
Dirty drain nozzle in forward-reverse
spool valve
- Housing pressure?
- Clean
- Replace
- Clean
- Replace
- Check gearbox
- Mechanical connection
- Motor A6VM -> malfunctioning gearbox
Measuring point: supply pressure
measurement connection (See chapter
on variable displacement pump)
Measuring point X
1
/X
2
no
ok
no
ok
ok
ok
ok
no
Measuring point
Measuring point
no
no
no
Measuring point M
A
/M
B
ok
no
no
Travel drive
Troubleshooting