SUB-SECTION 5A
BOOM AND WINCH SYSTEMS
SUB-SECTION 5A
BOOM AND WINCH SYSTEMS
REMOVAL - BOOM TELESCOPE CYLINDERS
GENERAL
This section covers the components used in the boom hoist,
To remove the boom telescope cylinders, the boom itself
boom telescope, and winch systems, with the exception of
must first be disassembled. To disassemble the boom,
the pumps and control valves.
proceed as follows (see Figure 5A-2):
This sub-section describes the method of removing the
1. Rotate the upper so that the boom assembly is over the
front of the carrier, and lower the boom onto the boom
boom hoist and boom telescope cylinders from the me-
cradle.
chine. Repair of the cylinders is covered in the next two
sub-sections.
2. Support the main winch and winch mount. and remove
the attaching hardware. Lower the winch and winch mount
Repair of the other components of the boom and winch
systems are covered in the remaining subsections.
onto the deck of the machine.
REMOVAL-BOOM HOIST CYLINDERS
NOTE
To remove the boom hoist cylinders, proceed as follows
The winch and winch mount can be left suspended
(see Figure 5A-1):
from the boom by removing only the top attaching
hardware, and allowing the mount to swing down. Be
1. Lower the boom onto the boom cradle at the front of
sure that the winch mount is supported before
the carrier.
removing any attaching hardware.
2. Remove the hydraulic lines attached to the cylinder to
3. Disconnect the hydraulic lines attached to the cylinders.
be removed. Cap the line securely and plug the cylinder
ports.
Cap the lines and plug the inlet ports of the cylinders.
3. Remove the retainers at the top and bottom of the
cylinder which is being removed. Press the pin out of the
bottom of the cylinder rod eye.
Block the end of the lower telescope cylinder so that
4. Attach a suitable lifting device to the cylinder that is
it will not drop when the pin is driven out of the
being removed to prevent it from swinging away from the
cylinder and.
revolving frame as the boom is lifted.
4. Loosen the set screw in the locking collar on each side
5. Slowly lift the boom by placing the boom hoist lever in
of the lower cylinder pin. Drive the pin out of the Iower
the raise position. Lift the boom high enough to allow the
cylinder eye using a suitable drift pin.
cylinder to be swung away from the revolving frame.
5. Slide boom sections 1 and 2 forward until they can be
6. When the cylinder is in a vertical position, slide it out-
removed with a crane, and placed on suitable cribbing.
ward from the boom, and remove it to a suitable repair
6. Loosen the set screw in the locking collar on each side
area.
of the upper cylinder pin. Drive the pin out of the upper
WARNING
cylinder eye using a suitable drift pin.
Lower the boom back onto the boom cradle after the
7. Slide boom section 2 forward until it can be removed
cylinder has been removed. Install warning tags on the
with a crane, and placed on suitable cribbing.
machine to warn against operating the machine while
the cylinder is removed.
8. Remove the screws and retainers attached to the front
5A-1