Boom Nose Sheaves; Assembly - Manitowoc Grove RT770E Service Maintenance Manual

RT770E SERVICE MANUAL

Boom Nose Sheaves

Removal
1. Remove the clip pins from the cable retainer pins and
remove the cable retainer pins from the upper and lower
part of the boom nose.
2. Remove the capscrew, washer, and nut securing the
upper boom nose sheave shaft. Remove the collar.
NOTE: The boom nose
approximately 42.9 kg (95 lb) each. The boom
nose sheaves weigh approximately 5.5 kg (12.5 lb)
apiece.
3. Carefully pull the upper boom nose sheave shaft from
the boom nose, removing the spacers, shims, and boom
nose sheaves. Note location of each.
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
CAUTION
Do not install the boom nose sheaves over the threaded
end of the boom nose sheave shaft. Component damage
could occur.
NOTE: The boom nose
approximately 42.9 kg (95 lb) each. The boom
nose sheaves weigh approximately 5.5 kg (12.5 lb)
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 end play in the entire
assembly is within 1 mm to 2 mm (0.04 in to 0.08 in)
total. Install shims as necessary to achieve the correct
GROVE
sheave shafts weigh
sheave shafts weigh
Published 11/26/2014, Control # 447-05
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.
CAUTION
A rollover fixture with webbing is recommended to rotate
the boom sections. Chains are not recommended. If a
rollover fixture is not available, rotate the 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 the extend and retract cables, hold the
cable end and turn the nut. Do not turn the cable. Turning
the cable while adjusting will result in damage or failure of
the cable.
Install the cables in their natural untwisted condition. Do
not twist the cable. Twisting the cable will result in
damage or failure of the cable.
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.
Use the following procedures and refer to Figure 4-2 when
assembling the boom.
1. Position the telescope cylinder (6) up side down on
adequate supports.
2. Attach the telescope
weldment (136) to the end of the telescope cylinder (6)
using four capscrews (138) and hardened flat washers
(137).
3. Attach the sheave assembly (139) to the telescope
cylinder sheave mounting weldment (136) using the
hollow shaft (141) and four spacers (140); ensure the
machined notches on the ends of the hollow shaft face
towards the boom tip (see Figure 4-27).
4. Evenly lay out the six tele 3 extend cables (150) beneath
the cylinder; label the cables on both ends with
sequence numbers (1-2-3-4-5-6) to prevent them from
being crossed during future installation.
BOOM
cylinder sheave mounting
4-21
4