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Manitowoc Grove GRT880 User Manual

Manitowoc Grove GRT880
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SET-UP AND INSTALLATION GRT880 OPERATOR MANUAL
4-16 Published 3-25-2020, Control # 643-04
Setting Boom Extension Manual Offset
Refer to Figure 4-11.
Changing Offset from 0° to 20° or 40°
1. Extend and set outriggers. Swing boom over front of
crane.
2. Raise and lock the mast assembly:
a. Remove mast assembly clip pin and pin from the
stowed position on the extension
b. Raise the mast assembly to an upright position.
c. Install pin and clip pin.
d. Remove cable retainer pin and clip pin from mast.
3. Raise boom above horizontal.
4. Block under tip of boom extension section.
5. Slowly lower boom until weight is removed from offset
assembly.
6. Remove offset clip and pin securing offset assembly in
the lesser degree offset position. If going to maximum
offset stow in the stowage lug. If going to intermediate
(20°) offset, install in offset hole for that degree of offset.
7. Reeve hoist cable as described under normal erecting
procedures.
8. Slowly elevate and telescope boom at the same time so
boom extension does not move off of the blocking until
offset assembly takes full weight of the boom extension.
Changing Offset from 40° to 20° or 0°
1. Extend and set outriggers. Swing boom over front of
crane.
2. Block under tip of boom extension section.
3. Slowly lower boom until weight is removed from offset
assembly.
4. Remove clip and pins from offset assembly. Lower boom
until holes for lesser degree offset position align in offset
assembly. Install offset pin and clip.
5. Slowly elevate and telescope boom at the same time so
boom extension does not move off blocking until offset
links take full weight of the extension.
6. Stow mast assembly:
a. Remove pin from the upright position lug on the
extension
b. Lower the mast assembly and install the pin in the
stowed position lug.
c. Secure with clip pin.
7. Reeve hoist cable as described under normal erecting
procedures.
DANGER
Crushing Hazard!
Ensure blocking material is adequate to support weight of
extension assembly without tipping or falling.
CAUTION
Possible Equipment Damage!
Do not overload boom extension anchor fittings or boom
extension base section when lowering the boom.
CAUTION
Do not overload boom extension anchor fittings or boom
extension base section when lowering the boom.

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Manitowoc Grove GRT880 Specifications

General IconGeneral
BrandManitowoc
ModelGrove GRT880
CategoryConstruction Equipment
LanguageEnglish

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