Manitowoc Grove GRT880 Service Manual

4-29
Published 10/19/2017, Control # 618-00
GRT880 SERVICE MANUAL BOOM
4
GROVE
72. Remove four bolts and washers (542, 529) securing
sheave head weldment (506) to front of telescope
cylinder #1 (502) (see Figure 4-55).
BOOM NOSE SHEAVES REMOVAL AND
INSTALLATION
Removal
1. Remove hitch pin clips from the three lock hair pins, then
remove lock hair pins from upper and lower parts of
boom nose.
2. Remove four holder plates securing upper and lower
boom nose shafts in boom nos weldment.
NOTE: The boom nose sheave shafts weigh
approximately 46 kg (100 lb) each. The boom nose
sheaves weigh approximately 7.7 kg (17 lb) each.
3. Carefully pull upper boom nose sheave shaft from boom
nose, removing spacers, shims, and boom nose
sheaves. Note location of each.
4. Carefully pull lower boom nose sheave shaft from boom
nose, removing spacers, shims, boom nose sheaves,
and weldment pin keepers. Note location of each.
Installation
NOTE: The boom nose sheave shafts weigh
approximately 46 kg (100 lb) each. The boom nose
sheaves weigh approximately 7.7 kg (17 lb) each.
1. Slowly insert lower boom nose sheave shaft through
boom nose while adding weldment pin keepers,
spacers, shims, and boom nose sheaves following their
location noted during disassembly.
2. Slowly insert upper boom nose sheave shaft through
boom nose while adding spacers, shims, and boom
nose sheaves following their location noted during
disassembly.
3. Ensure end play is 1 mm to 2 mm on both upper and
lower boom sheave shafts. If additional shims are
needed, install them equally on both sides of the boom
nose.
4. Secure upper and lower boom nose shafts to the boom
nose using holder plates and capscrews.
5. Install the three lock hair pins into upper and lower parts
of boom nose, then secure with hitch pin clips.
BOOM ASSEMBLY
NOTE: The boom assembly must be rotated 180° (upside
down) before performing any assembly or
disassembly procedures.
NOTE: Apply medium strength thread locking
adhesive/sealant and primer to the threads of all
attaching hardware except cable ends and cable
lock nuts (8, 521, 543).
NOTE: Apply multipurpose grease (MPG) to all wear
surfaces.
NOTE: Use standard Grade 5 and 8 torque values
specified in Section 1 of this manual unless
otherwise specified.
Use the following procedures and refer to Figure 4-1 when
assembling the boom.
FIGURE 4-55
9044-2
506
502
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 the boom section(s).
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.
Reference Only

Manitowoc Grove GRT880 Specifications

General

Brand	Manitowoc
Model	Grove GRT880
Category	Construction Equipment
Language	English