78 - 5
Section E
Hydraulics
9803/6400
Section E
78 - 5
Issue 1
Hydraulic Rams
Trouble Shooting (continued)
Item Symptoms Related Parts Trouble Treatment
4-3 Air remaining inside ram • Bleed the air.
Operation is unsteady 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
Air 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.
4
4-4 Pin bushing Pin Gap between installation part and Measure the pin and pin bushing and
Heavy shock
pin bushing is too large replace parts if measurements exceed
loading when
the specifications.
changing from
extension to
retraction
and back
Oil supply Insufficient oil • Add oil.
Pin bushing Pin Scuffing at connecting part • Replace with new part and add oil.
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.
4-5
Noisy
operation
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