TROUBLESHOOTING 2250 SERVICE/MAINTENANCE MANUAL
10-60
Published 07-19-16, Control # 249-01
Test 25—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 as follows.
1. If the problem cylinder is in the extend position,
disconnect the cylinder extend hose (1) from the
hydraulic hard line fitting (2).
If the problem cylinder is in the retract position,
disconnect the cylinder retract hose (3) from the
hydraulic hard line fitting.
2. Immediately plug the hard line fitting and place the
flexible hose from the cylinder into a holding tank or
bucket.
3. Start the crane and pressurize the problem cylinder.
NOTE: 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.
P1536
1
2
3
4
FIGURE 10-28
Item Description
1 Cylinder Extend Hose
2 Hydraulic Hard Line Fitting (qty 2)
3 Cylinder Retract Hose
4 Pin Cylinder
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