SECTION 7
HIGH PRESSURE WATER
Nov 2002
p. 7-10
05126826
7.2.5 Hydraulic Cylinder Head and Hydraulic Piston
Disassembly
1. Remove sealing head and HP cylinder using procedures in Sections
7.2.2 and 7.2.3.
2. Remove proximity switch (19) at cylinder end to be serviced. If both
cylinder heads and/or the hydraulic piston (21) are to be removed,
both proximity switches must be removed.
3. Remove hydraulic seal cartridge (8). Seal cartridge (8) removal is
recommended to avoid sliding cylinder head (4) over plunger (2). The
plunger need not be removed at this stage. Note that potential
plunger damage can be avoided if plunger is removed prior to
unbolting cylinder head.
4. Loosen and remove 8 each socket head cap screws (18) retaining
cylinder head (4) to hydraulic cylinder (15). The cylinder head and its
O-ring (16) can be removed. The proximity switch mounting flats
provide a small lip for loosening the cylinder head.
5. To remove the hydraulic piston (21) from the hydraulic cylinder (15),
remove both cylinder heads. The piston must be driven from the
cylinder bore due to the seal squeeze and friction. Use a plastic head
hammer to avoid striking the assembly with a metal object. See
Section 7.3.7 for servicing the hydraulic piston.
6. Reassemble the hydraulic cylinder by reversing the above steps.
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