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19.5 LOAD HOLDING AND LOAD REGULATION VALVES
Checking the operation
1. To check the load holding valves of the outrigger cylinders for tightness, measure the
height of the chassis from the floor separately at each outrigger, and observe the
height in a few minute's time.
2. To check the load regulation valves of the boom cylinder and the cylinders of the
articulated arms for tightness, drive the boom to a position in which its position can be
reliably measured. Observe the possible movement of the boom in a few minute's
time.
3. To check the load regulation valve of the telescope cylinder for tightness, extend the
telescope and stop the movement at any position, measure the stroke and observe in
a few minutes time that the stroke does not change. (Note! Drive the boom to an
almost vertical position).
4. To check the load regulation valve of the platform's levelling system for tightness, put
a load of 100-200 kg on the platform and measure the distance from the rear edge of
the platform to the floor. Observe in a few minutes time that the height position does
not change.
Service instructions
1. Remove and clean the valve.
2. Check the O-rings and, if necessary, replace them.
3. Put the valves carefully in place.
4. If necessary, replace the valve.
5. Do not change the set values of the valves.
Support the platform, the boom system and the outriggers
in a position, where the load does not rest on the structure
to be repaired. Ensure that there is no residual pressure
left in the cylinders.
Courtesy of Crane.Market
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