Maintenance and care 7
TW85 93
7.9.11 Bleeding the plunger cylinders
• Pressure supply is via the flushing oil circuit of
the hydrostatic drive.
• Latching occurs by blocking the connection line
between the plunger cylinders by means of
locking valve, which is activated by the
excavator brake (78/12) or the rocker switch
"pendulum axle locking" (78/62).
• The axle may not oscillate with excavator brake
engaged or toggle switch for pendulum axle
locking activated.
Bleeding
• Secure the machine against rolling away.
• Release excavator brake (78/11)
• Release the parking brake (78/63).
• Toggle switch for pendulum axle locking (78/62)
set to “OFF”.
• Let the engine run at medium speed.
• Open bleeder screws (79/1) on plunger cylinder
right and left one after another until hydraulic oil
emerges without bubbles.
• Close bleeder screws.
7.9.12 Hose-rupture safety valves of support
legs
During this test, the machine must be
secured in such a way as to ensure that,
in the event of a defect in the hose-
rupture safety valves, there can be no
danger to persons or objects.
• Subject the outrigger to be tested to a load
applied in the non-operating direction.
• Switch off the engine; switch on the ignition.
• Operate the support leg’s control lever.
The function is correct when the controls do
not move the support leg!
P
HM32-078
62
63
11 12
Fig. 78 Operation
1
HM32-079
Fig. 79 Plunger cylinder
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