122 Hydraulic System
Detecting Cylinder Internal Leaks
An internal leak is caused by a damaged seal inside the hydraulic cylinder (see 1 in Figure 5-32).
Because the cylinder is leaking oil inside (bypassing), a certain amount of pressure is lost, reducing
the efficiency of the cylinder and its capacity to push and/or pull.
If the packer cylinder is bypassing, the seal inside the cylinder may need to be replaced. If an internal
leak is suspected, apply the following procedure.
To detect internal leaks inside a packer cylinder:
1. Apply all safety measures and set the parking brake.
2. Pull on the red emergency STOP button.
3. Start the engine and engage the hydraulic pump.
4. Fully open the tailgate.
5. Fully extend the packer cylinder and disengage the hydraulic pump.
6. Disconnect hose “A” and install a plug at the end of the hose.
7. Engage the hydraulic pump.
8. Push the green button and see if oil is leaking from port “A”, then push the emergency STOP
button.
If oil leaks out of port “A” when pressure is applied, there might be an internal leak; replace or
repair the cylinder.
NOTE: It may be necessary to perform this procedure with the packer in retract position.
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