Maintenance work on the superstructure
8.6 Hydraulic system
07.12.2017
Maintenance manual 3 302 649 en 8 - 41
GMK4090
Changing oil
filter 2
• Release the receptacle (1) at the hexagon
head.
• Change the filter (2).
• Replace the gaskets.
• Fill the receptacle with clean oil and tighten
it – torque 25 Nm (18.5 ft lbf).
After changing
the filter
• Check the valve on the hydraulic oil tank. Open the valve, if necessary;
à p. 8 - 44.
• Check the oil level. Top up the oil if necessary; à p. 8 - 43.
• To bleed the system (from the crane cab), start the engine and let it idle
for 3 minutes.
• Check that none of the oil filters is leaking.
S
Risk of damage to the hydraulic pumps
The engine may only be started if the valve in the suction line of the hydrau-
lic pumps is open and there is enough hydraulic oil in the hydraulic oil tank.
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