BOOM
RT765E-2 SERVICE MANUAL
4-10
Published 9-04-2014, Control # 422-08
4.
Repeat steps 2 and 3 and remove the lower boom nose
sheave shaft.
5.
Remove the shim, keyed washer, washer, and locknut
from both sheave shafts.
Installation
NOTE:
The boom nose sheave shafts weigh
approximately 138 lb (63 kg) each. The boom nose
sheaves weigh approximately 28 lb (13 kg) apiece.
1.
Install the spacers and sheaves onto the sheave shaft
while installing the sheave shafts into the boom nose.
Ensure that top spacer and sheaves are in proper
orientation to lower sheaves and grease fittings point
outward.
NOTE:
The lockwasher can be used more than once but
must be replaced if not in good condition.
NOTE:
Install the lockwasher onto the sheave shaft with
the tabs facing out.
2.
Install the locknut, washer, keyed washer, and shims (if
necessary) onto the boom nose sheave shaft with the
chamfer side out. Install the collar onto the opposite end
of the sheave shafts and secure in place with the bolt,
washer, and nut.
NOTE:
If more than one shim is required, install an equal
amount on each side of the boom nose.
3.
Tighten the locknut until the play in the entire assembly
is within 0.03 in (0.79 mm) total. Install shims as
necessary to achieve the correct dimension. Bend the
lockwasher tabs to secure the locknut in place.
4.
Install the cable retainer pins into the upper and lower
part of the boom nose and secure in place with the clip
pins.
Assembly
NOTE:
The boom assembly must be rotated 180° (upside
d o w n ) b e f o r e p e r f o r m i n g a n y a s s e m b l y o r
disassembly procedures.
NOTE:
Apply Loctite 243 to the threads of all attaching
hardware except cable ends and cable lock nuts.
NOTE:
Apply multipurpose grease (MPG) to all wear
surfaces.
NOTE:
Use standard Grade 5 and/or 8 torque values
specified in Section 1 of this Manual unless
otherwise specified.
1.
Install wear pads on the bottom of the upper telescope
cylinder support foot using two screws each.
2.
Install the support foot and the sheave mounting
assembly on the front of the upper telescope cylinder
assembly, with the capscrews and washers. Attach the
support foot and the sheave mounting assembly
together using the capscrews and washers.
NOTE:
The sheave shaft should be installed with grease
fitting hole to the left side.
3.
Using the sheave shaft, install the sheave assembly in
the sheave mounting assembly. Secure the shaft with a
plate, capscrews and washers on each side of the
sheave mounting assembly. Install grease fitting in shaft
and apply grease.
4.
Route the lug end of the four extension cables up and
around the upper telescope cylinder sheaves about one
foot on to cylinder. To aid in assembly, secure the cables
to the end of the cylinder by wrapping tape around the
cylinder.
5.
Position the cable retainer plate on the front of the
sheave mounting assembly and secure with the
capscrews and lockwashers.
6.
Install the skid pad to the bottom of the lower telescope
cylinder mount with four flat head screws.
7.
Install the cylinder mount to the lugs on the front of the
lower telescope cylinder using the shaft. Secure the
CAUTION
Do not install the boom nose sheaves over the threaded
end of the boom nose sheave shaft. Component damage
could occur.
CAUTION
A rollover fixture with webbing is recommended to rotate
boom and sections. Chains are not recommended. If a
rollover fixture is not available, rotate sections using
adequate support with webbing.
A secure fixture that will prevent damage to the boom is
recommended to stabilize and hold the boom from moving
during removal of any section or sections.
When adjusting cables, hold the cable end and turn the
nut. do not turn cable. Turning cable while adjusting will
result in damage or failure of cable.
Install cables in their natural untwisted condition. Do not
twist cable. Twisting of cable will result in damage or
failure of cable.
Reference Only
