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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 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

jcb JS210 Service Manual

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