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15.9 Water level check
Correct position of the water level (on top of the control valve box at ground level) in relation
to the upper surface of the slewing ring must be checked in accordance with the maintenance
schedule, or if there is reason to believe that the position of the water level has changed:
Make sure that the booms are in transport position and put a water level on the slewing ring.
Compare the position of this water level to the position of the water level on the control valve
box. If the positions are different, adjust the water level on the valve box with the adjustment
screws so that both levels are in the same position. Do the adjustment both lengthwise and
sideways.
15.10 Adjustments of the Hydraulic system
The hydraulic system has been adjusted to
correct values at the factory and normally there is
no need to adjust them
.
Picture 19 shows the components inside the
drive and outrigger valve box:
1. Drive Control Valve, Solenoid K98B (Outriggers)
2. Drive valve
3. Selector valve of lower controls K93 (option)
4. Drive control valve, solenoid K98A (booms)
5. Boom pressure solenoid K94
Picture 19.
All cylinders
– except for the self levelling ”slave”
cylinder
– are equipped with load holding valves (no.
1 in the picture left), which prevent cylinder
movements in case e.g. a hydraulic hose fails.
When using emergency lowering of the booms, the
electric solenoid valve in the cylinder (no. 2) opens
and oil flows through the adjustable restrictor valve
into the tank and the boom(s) come down.
Picture 20.
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