SECTION 7
HIGH PRESSURE WATER
May 2003
p. 7-24
49831951
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.
Item Description
1. Piston
2. Pin (12 Each)
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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