Section 6
Hydraulic System
20425603
5-2005/Rev 0
6-10
Oil in the pump case provides internal lubrication for the hydraulic pump. Failure
to the fill the pump case with oil will allow air to become trapped inside, damaging
the pump.
5. Disconnect the discharge hose from the fill port and replace the fill port cap.
6. Check the sight gauge again and follow the same procedure to add additional oil if
necessary.
Hydraulic Compensator Maintenance
The high and low limit compensators regulate the flow of hydraulic fluid to the system. The
compensators can become blocked with debris resulting in loss of pump control.
Figure 6-7: Hydraulic Compensator Components
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lockout/Tagout procedures before performing maintenance on the
system components.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before performing maintenance.
2. Remove the hydraulic hose from the low limit compensator.
SPOOL
SPRING CUP
SPRINGS
SPRING
COLLAR
PLUG NUT
SEALING
CAP
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