jcb JS200 Service Manual page 391

Section E
78 - 5
Trouble Shooting (continued)
Item Symptoms Related Parts
4-3
4
4-4 Pin bushing Pin
Heavy shock
loading when
changing from
extension to
retraction
and back
4-5
Noisy
Pin bushing Pin
operation
Note: If left in the state where operation is poor, the ram will no longer move and other parts will be effected
adversely. Inspect early and carry out appropriate measures.
9803/6400
Air remaining inside ram
Operation is unsteady
Air
Gap between installation part and
pin bushing is too large
Oil supply Insufficient oil
Scuffing at connecting part
Hydraulics
Hydraulic Rams
Trouble Treatment
• Bleed the air.
For rams that do not have an air
bleeder, operate back and forth several
times at low pressure and low speed to
bleed the air. For rams with an air
bleeder, remove the load to reduce the
pressure then loosen the air bleeder
and completely bleed the air.
Note: The ram may expand if it is
stopped suddenly. This is due to the
compression of the hydraulic oil. This
occurs especially with long stroke rams.
Measure the pin and pin bushing and
replace parts if measurements exceed
the specifications.
• Add oil.
• Replace with new part and add oil.
Section E
78 - 5
Issue 1