Section 8
High Pressure Water System
20425618
5-2005/Rev 0
8-27
8.12 Hydraulic Piston
Two bearing rings provide wear contact between the piston and the inside diameter of the
hydraulic cylinder. On each end of the piston, six retainer pins hold the plunger in position. The
plunger retainer pins are held in place by a flat snap ring. Two internal check valves vent
unwanted hydraulic pressure from one side of the piston to the other, preventing pressure from
building behind the plunger button.
Figure 8-18: Hydraulic Piston Components
Hydraulic Piston Removal
The following procedure is used to remove the hydraulic piston.
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
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