Avant 850
Service and maintenance
121
Adjusting hydraulic pressures
Adjustment of hydraulic pressures should be left for
qualified service technicians. If you have the
equipment and skills to do the adjustment yourself,
keep the following in mind.
1.
Turn adjustment screw of a pressure relief
valve only with small increments, max 1/8
rounds at a time.
2.
Check pressure after each adjustment.
3.
Check pressure once again after tightening the
securing cap nut back.
4.
Make sure the pressure does not exceed
specified values.
DANGER
Never exceed the recommended
hydraulic pressure settings.
Excessive hydraulic pressure may
lead to hydraulic oil ejection by
hose burst or component failure.
Wrong adjustment will damage or
wear the hydraulic pumps,
cylinders, and hydraulic motors.
Warranty does not cover damages
caused by excessive hydraulic
pressure.
14.
Measure and adjust charge
pressure of variable displacement
pump
A hydraulic pump that is integrated in the housing of
the drive pump circulates oil through the closed loop
hydrostatic drive system. This flushing is important
as it cools the drive hydraulics and drive motors. The
pressure and output of the charge pump also keeps
the parking brake open. Special measurement tools
and training is required for testing the charge pump.
Contact your nearest Avant service.
15.
Measure and adjust power
control valve
The power control valve of the hydraulic drive pump
optimizes driving performance of the loader by
reducing stalling of the loader when load increases
quickly, and by making starting and stopping of the
loader smoother. The valve is installed to the
variable displacement pump of the hydrostatic drive.
If the loader stalls easily when pressing the drive
pedals, or when starting and stopping of the loader is
not smooth, contact your nearest Avant service
partner for check and adjustment of the power
control valve. The initial system settings may change
as parts of the hydraulic system settle after taking
the loader into use. Special tools, measurement
devices, and training are required to complete this
operation safely and correctly.
16.
Adjust and replace slide pads of
telescopic boom
The telescopic boom is equipped with replaceable
slide pads. The slide pads are wear parts that wear
during normal use of the telescopic function. All slide
pads can be replaced, and the nylon slide pads on
the outer boom can also be adjusted. Adjustment or
replacement of the slide pads is necessary to
compensate for wear and to adjust the play between
the outer and inner telescopic boom.
At the lower end of the outer boom there are
pairs of nylon slide pads 1 and 2, accessible
from around the boom.
In addition, there are pairs of aluminium-bronze
alloy slide pads 3 and 4, at the upper end of the
inner boom. To access pads 3 and 4, the inner
boom must be separated from the outer boom.
Lifting equipment is needed to complete this. It is
recommended to leave the check and
replacement of slide pads of the inner boom to
professional service.
Summary of Contents for Avant 850
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Page 128: ...Avant 850 128...
Page 132: ...Avant 850 132 Notes...
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