SUB-SECTION 5C
BOOM TELESCOPE CYLlNDERS
SUB-SECTION 5C
BOOM TELESCOPE CYLINDERS
the head gland. Unscrew the head gland and slide it off the
BOOM TELESCOPE CYLINDER (38Z230)
rod.
DISASSEMBLY. To disassemble the boom telescope cylin-
der. proceed as follows (see Figure 5C-1):
1. Remove the counterbalance valve cartridge at the base
The rod must be supportad at all times to prevent
of the cylinder only if repairs are required.
damage to the piston and/or cylinder bore. Do not
2. Remove the two locking set screws at the extreme outer
allow the rod to cantilever from the cylinder.
end of the rod. Unscrew the rod eye from the tubular rod
5. Remove the rod and piston by pulling the rod straight
by placing a pin or bar through the rod eye, and if neces-
out of the cylinder. Use extreme caution to ensure that the
sary, prevent the rod from rotating by placing a spanner
rod surface does not become scratched, nicked, or other-
wrench in the holes provided in the end of the rod.
wise damaged during or after its removal from the cylinder.
3. Remove the locking sat screw from the face of the head
5. Loosen the two locking set screws in the piston nut, and
gland nut, and unscrew the nut. The rod seals can be re-
remove the piston nut using a spanner wrench. Remove the
moved by either pulling the rod out of the cylinder a few
piston by tapping the front end of the spacer sleeve with a
inches, or by prying the seals out of the pocket with a sharp
wooden block.
instrument.
INSPECTION AND REPAIR. After the cylinder has been
4. Pull the rod out of the cylinder approximately two feet
disassembled, clean all the cylinder components in a suit-
and support the rod to remove the weight of the rod from
Figure 5C-1. Boom Telescope Cylinder
5C-1
