Check The Efficency Of The Block Valves - Terex Genie GTH-4017 EX Service Manual

November 2008
C-15 CHECK THE EFFICENCY OF THE BLOCK
VALVES
The piloted blocking valves A 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 (4000 kg for GTH 4017 EX and GTH 4013 EX).
(4500 kg for GTH 4514 EX).
- 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 efficent working order of the block valves
on the outriggers, lower the outriggers to ground and
unload the wheel weight without lifting them from the
ground. To check the efficency of the valve, loosen
the hoses.
During the check, the load shall remain blocked in
position.
Should that not be the case, the valve must be
replaced.
PROTECT THE
ENVIRONMENT
Place a container of suitable size under the plug for
oil leaks.
E
Attachment pitching cylinder
Document 57.0009.0427 GTH-4017EX GTH-4514EX GTH-4013EX
Section 4 - Maintenance Procedures
A
Attachment locking cylinder
Lifting boom cylinder
Balance cylinder
Boom extension cylinder
TABLE C
B
C
D
D
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