Wacker Neuson 28Z3 Service Manual

SHB 28Z3 EN – Edition 2.0 * 28z3s312.fm 3-35
Maintenance
Pressure check of gear pump P3
Hydraulic supply for stabiliser blade, auxiliary hydraulics, boom swivel, upper carriage
rotation, optional 3rd control circuit
Checking primary pressure limiting valve 3 (PPLV 3)
☞ Connect a pressure gauge to measuring port MP 3 44/3
☞ Extend the stabiliser blade ram as far as it will go at maximum engine speed
☞ Check and make a note of the pressure value.
Checking pressure drop
☞ Extend the stabiliser blade ram as far as it will go at maximum engine speed
☞ Swiftly reduce engine speed from maximum to minimum -> pressure drop
☞ Check and make a note of the pressure value.
➥ Pressure drop should not be more than 10 % of the specified value
Setting primary pressure limiting valve 3 (PPLV 3)
☞ Adjust the pressure at the primary pressure limiting valve (PPLV 3) 45/C on the main
valve block
☞ 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 primary pressure limiting valve 3 and the pressure drop once adjustment is
over
Also check with the retract stabiliser blade, boom swivel and upper carriage rota-
tion functions
Checking the auxiliary hydraulics pressure
Notice!
Factory indications for auxiliary hydraulics secondary valves are possibly invalid –
adapt these values to the attachment!
3
Fig. 44: Measuring port P3
Fig. 45: Primary pressure limiting valve 3
C

Wacker Neuson 28Z3 Specifications

General

Brand	Wacker Neuson
Model	28Z3
Category	Excavators
Language	English