114 Model 5525-6025-6625 Parts & Specifications Manual Part # 99904215
Holding Valve Inspection
The cylinders are equipped with holding valves that prevent sudden movement of the cylinder
rods in the event of a hydraulic hose or other hydraulic component failure. The valve is checked
in the following manner:
1 With a full rated load, extend the cylinder in question and kill the engine.
2 Operate the control valve to retract the cylinder. If the cylinder “creeps”, replace the holding
valve. If the cylinder does not “creep”, the valve is serviceable.
Anti-Two-Block Device Inspection
(See the operation, maintenance, and repair manual for this crane for a complete description.)
The anti-two-block system should be checked daily as follows:
1 Examine flexible rod and weight to insure free unrestricted mechanical operation.
2 Examine cord for damage, cuts or breaks. Grasp cord and pull to check operation of cord
reel. The cord should retract on reel when released.
3 Start vehicle, engage PTO and slowly winch loadline up until anti-two-block weight comes in
contact with the hook end of the loadline cable. At the moment the weight is fully supported,
a marked difference in winch operation should be noted. At this point, the winch up function
should become very sluggish or non-functioning and have very little pull capability. Slowly
increase truck engine speed while simultaneously actuating the winch up function. The winch
characteristics should remain sluggish with little or no tensioning of the cable. If operation
other than as described occurs, stop immediately and investigate. Failure to do so will risk
damage to the cable or the crane. If all is well at this point, actuate the boom extend function
slowly, and gradually increase to full actuation. Once again the function should be sluggish
or non-existent with no tightening of the winch cable. If operation other than described
occurs, stop immediately and reverse the function.
4 The final check involves actuating both the winch up and extend functions together and
checking for proper operation of the anti-two-blocking circuit. Once again, start slowly and
stop if it appears the cable is being tensioned.
5 If the anti-two-block function appears to be functioning normally, winch the cable down until
the sensing weight swings free.
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