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First Edition - Second Printing
Checking the block valves (every 3 months)
The piloted blocking valves allow to held the load in
position in case of burst of a flexible hose.
To check the efficiency of a valve, proceed as follows:
Load a weight near the maximum payload onto
•
the boom.
•
Raise the load some centimetres above the
ground (max 10 cm). To check the valve on the
telescope extension cylinder move the boom to
maximum height and extend it some centimetres.
•
Loosen the oil hoses to the cylinder of which you
are checking the valve with caution.
•
To check the efficiency of the block valves of the
outriggers, lower them to the ground and unload
the weight of the tyres without raising them.
Loosen the cylinder hoses to check the efficiency
of the valve.
During the check, the oil will flow out of the hoses
and the load shall remain blocked in position.
Should that not be the case, the valve must be
replaced. Contact TEREXLIFT Technical Service.
Part No. 57.0009.0540
GTH-4013 SX - GTH-4017 SX - GTH-4013 EX - GTH-4017 EX
To remove the block valves or the cylinders
-
Lower the boom to the ground in a firm way since
the removal of the block valve or the cylinder can
cause an uncontrolled down-movement.
-
After refitting the valve or the cylinder, replenish
the circuit and eliminate any air before starting
working. To eliminate the air from the circuit,
move the involved cylinders to end-of-stroke in
the two directions (opening/closing). To eliminate
the air from the fork slave cylinder, move the
boom up and down and tilt the fork plate forwards/
backwards.
WARNING
Do the check of the valves taking all the possible
precautionary measures:
-
Wear safety glasses
-
Wear safety gloves
-
Wear safety shoes
-
Wear suitable working clothes
-
Use guards against leaks of oil at high
pressure
-
Do the check in a free space with barriers all
around to keep non-authorised people away
-
Ensure that the part to be checked is in safe
condition and that the action generated does
not result in an uncontrolled movement of the
machine.
Operator's Manual
Maintenance
119
Courtesy of Crane.Market
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