Section 7
Hydraulic System
20412971
8-2012/Rev 08
7-9
13. Reinstall the electrical panel to the end of the frame, if necessary.
14. Start the motor and apply full high pressure water pressure. Note any unusual sounds
from the motor or pump assembly.
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 7-7: Hydraulic Compensator Components
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.
1. Remove the hydraulic hose from the low limit compensator.
2. Remove the four socket screws that attach the compensators to the pump.
3. Remove the compensators and then remove the three plugs and o-rings on the back of the
housing.
SPOOL
SPRING CUP
SPRINGS
SPRING
COLLAR
PLUG NUT
SEALING
CAP
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