BOOM HOIST CYLINDERS
SUB-SECTION 5B
SUB-SECTION 5B
BOOM HOIST CYLINDERS
3. Remove the cotter pin at the piston end of the rod and
BOOM HOIST CYLINDER (38Z231)
remove the piston nut. The piston, head gland, and thread
DISASSEMBLY. To disassemble the boom hoist cylinders,
ring can now be removed.
proceed as follows (see Figure 5B-1):
1. Remove lock screw (1) and washer to unlock the thread
INSPECTION AND REPAIR. After the cylinder has been
ring. Remove two screws (2). Insert a spanner wrench into
disassembled, clean all the cylinder components in a suit-
the screw holes in the thread ring, and unscrew the thread
able commercial cleaning solvent, and then Iay the parts on
ring.
a clean workbench for inspection. Particular attention
should be paid to the following items when inspecting the
2. Pull the rod, thread ring, head gland, and piston out of
cylinder components:
the cylinder.
1. Carefully inspect all seals and components for damage or
NOTE
excessive wear, and replace as required. The grey iron
piston rings tend to wear or "break-in" to the mating
It may be necessary to bump the piston against the
cylinder bore surface. These piston rings should not be
head assembly repeatly to force the head gland out of
replaced unless they have been seriously damaged.
the cylinder bore.
Figure 5B-1. Boom Hoist Cylinder (38Z231)
5B-1