SECTION 7
HIGH PRESSURE WATER
Jan 2001
Page 7-21
05114624
7.3.7 Hydraulic Piston
The hydraulic piston contains a seal assembly, glide rings that contact the
cylinder bore, pins and elastic bands to retain the two plungers, and check
valves to vent possible leaking hydraulic fluid internal to the piston assembly.
1. Replace piston hydraulic seal and glide rings (2 each) by removing these
components with the help of a smooth, dull-edged blade made from brass or
similar soft (relative to steel) material. Note that scratches to the seal groove
sides and/or bottom can result in an oil leak path. Care should be taken to
avoid scratches.
Item Description
(1) Piston (2) Pin (3) Set Screw
(4) Check Valve (5) Threadlocking (6) Elastic Band
(7) Back-up Ring Adhesive
(9) Seal Assembly
(10) Bearing Ring (8) O-ring
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