SECTION 7
HIGH PRESSURE WATER
p. 7-26
80078868
7.3.7 Hydraulic Piston
The hydraulic piston contains a seal assembly, bearing rings, pins and flat spring
bands, and check valves. Bearing rings (10) provide wear contact between piston
and cylinder ID. Plungers (12) are held in place by 6 each pins (2) per plunger. Pins
(2) are maintained in place by flat steel band (6). Check valves (4) are mounted
internal to the piston to vent unwanted hydraulic pressure to the piston opposite
side. These check valves prevent hydraulic pressure from building behind the
plunger button
Replace Piston Seal
1. Remove bearing rings (10) and worn seal ring assembly (9).
Do not scratch bottom surface of piston seal groove. Scratches to the seal
groove sides and/or bottom can result in a hydraulic leak.
NOTE: Use a smooth, dull-edged blade made from brass or similar soft (relative to
steel) material to remove and install seal assemblies.
Figure 7-15
Item Description
1. Piston
2. Pin (12 ea.)
3. Set Screw (2 ea.)
4. Check Valve (2 ea.)
5. Threadlocking
Adhesive
6. Flat Wire Snap Ring
(2 ea.)
7. Backup Ring (2 ea.)
8. O-ring
9. Seal Assy
10. Bearing Ring (2 ea.)
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