SECTION 7
HIGH PRESSURE WATER
p. 7-15
80078868
ARNING
!
8. Install HP cylinder jug to hydraulic cylinder head per paragraph 7.2.2.
7.2.6 Hydraulic Cylinder Head and Piston—Removal / Re-Installation
1. Remove HP and LP piping/ hose, then remove HP cylinder jug following
procedure 7.2.2 above.
2. Remove proximity switch (19) at cylinder end to be serviced. Loosen the
remaining proximity switch to drain hydraulic oil in tank.
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.
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
one cylinder head; remove the proximity switch toward that end. On the
opposite end remove the HP cylinder and end cap, and then remove the
retainer flange and hydraulic cartridge. 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.
Tighten 12M socket head capscrews (8 per cylinder head) in a crossing
pattern to 190-210 N-m (140- 155 ft-lbs).
Remember to install and tighten proximity switches. Failure
to do so will result in considerable spraying of hydraulic oil.
7. Install HP cylinder jug to hydraulic cylinder head per paragraph 7.2.2.
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