Maintenance work on the superstructure
8.6 Hydraulic system
07.12.2017
Maintenance manual 3 302 649 en 8 - 37
GMK4090
8.6.7 Pressure accumulator – checking the gas pressure
The superstructure is equipped with pressure
accumulators.
The filling pressure at 20 °C (68 °F) is:
• Have the filling pressure checked and if
necessary corrected by
Manitowoc Crane Care
or an authorised GROVE dealer.
8.6.8 Taking oil samples
The oil sample from the superstructure hydraulic system is taken in a way
similar to that for the carrier hydraulic system.
Information for taking samples with the hose and for the laboratory
analysis;
à Taking oil samples, p. 7 - 96.
Prerequisites – The engine is not running and is secured against unauthorised use;
à p. 2 - 3.
Select the sam-
pling location
To determine the usability of the oil, you must take a sample from the
hydraulic system. To do that you must connect the hose with the connecting
piece to a gauge port.
s
G
Risk of accidents due to incorrect inspection
The gas pressure test must be carried out only by an authorised official
inspector of pressure tanks or under his/her supervision or instructions.
1 Pressure accumulator 20 bar (290 psi)
2 Pressure accumulator 180 bar (2610 psi)
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