TROUBLESHOOTING 2250 SERVICE/MAINTENANCE MANUAL
10-62
Published 11-06-15, Control # 040-13
Test 26 — Checking Pin Cylinder Seals
Worn cylinder seals can cause problems associated with
hydraulic cylinder piston movement. The frame connecting
pin, crawler pin, and boom hinge pin cylinders do not have
load-holding valves. The piston seals and rod end wiper
seals can be checked for leakage.
If the problem cylinder is in the extend position, disconnect
the cylinder retract hose from the hydraulic hard fitting. If in
the retract position, disconnect the cylinder retract hose from
the hydraulic hard fitting. Immediately plug the hard line
fitting and place the flexible hose from the cylinder into a
holding tank or bucket. Start the crane and pressurize the
problem cylinder. Leakage from the disconnected hose
indicates a damaged piston seal.
The wiper seal at the rod end of the cylinder should also be
checked for leakage while enabling the cylinder in the extend
direction.
Item Description
1 Hydraulic hose (extend)
2 Hydraulic hard line fittings
3 Hydraulic hose (retract)
4 Pin Cylinder
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