Wacker Neuson 28Z3, Service Manual

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SHB 28Z3 EN – Edition 2.0 * 28z3s312.fm
Maintenance
Secondary pressure limiting valve of the gear motor
Check (at idling speed)
☞
Connect a pressure gauge to measuring port MP 3
☞
Place the bucket or the boom against the ground or the stabiliser blade, or drive against
hydraulic resistance
☞
Check and make a note of the pressure value.
Adjusting the secondary pressure limiting valve on the gear motor (at idling speed)
☞
Adjust the pressure at the secondary pressure limiting valve on the gear motor
☞
Slacken the locknut of the pressure limiting valve
☞
Unscrew the pressure limiting valve until you can read off a pressure drop on the
pressure gauge
➥
The valve seat may be stuck and must be slackened first
☞
Adjust the pressure limiting valve and tighten the locknut
☞
Check the secondary pressure limiting valve again once adjustment is over
Primary pressure limiting valves
1
Fig. 46: Secondary pressure limiting valve
Pos.
Designation
1
Pump primary pressure limiting valve 1 PPLV 1
2
Pump primary pressure limiting valve 2 PPLV 2
3
Pump primary pressure limiting valve 3 PPLV 3
4
Pressure reducing valve of pilot oil supply unit PRV 4
3
4
1
2