Manitowoc Grove GRT880 Service Manual

4-1
Published 10/19/2017, Control # 618-00
GRT880 SERVICE MANUAL BOOM
4
GROVE
SECTION 4
BOOM
SECTION CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Boom Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Boom Disassembly. . . . . . . . . . . . . . . . . . . . . . . . 4-15
Boom Nose Sheaves Removal and Installation. 4-29
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Boom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Boom Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-49
Boom Functional Check. . . . . . . . . . . . . . . . . . . . 4-50
Boom Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
Boom Alignment and Servicing . . . . . . . . . . . . . 4-51
Boom Extension and Retraction Cables . . . . . . 4-51
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-51
Cable Tensioning Check and Adjustment . . . . . . 4-51
Telescope Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-53
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . 4-53
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-54
Removal And Installation. . . . . . . . . . . . . . . . . . . 4-55
Disassembly And Assembly . . . . . . . . . . . . . . . . 4-55
Lift Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . 4-56
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-56
Lift Cylinder Removal. . . . . . . . . . . . . . . . . . . . . . 4-58
Lift Cylinder Installation . . . . . . . . . . . . . . . . . . . . 4-58
Hook Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-61
Adjusting Boom Extension Stowage Mounts. . . 4-62
DESCRIPTION
A four section 12.6 m to 41.1 m (41.2 ft to 134.7 ft), full
power, sequenced, and synchronized boom is installed on
this crane.
The boom utilizes two sequenced telescope cylinders for
telescoping and retracting of the boom plus cable
synchronization for the extension and retraction of the fly
section.
Boom assembly lift is provided by one lift cylinder. Boom
elevation is from -3° to 80°.
Two optional auxiliary boom nose are available for the boom
to simplify single part cable usage. The rooster sheave is
installed on the main boom nose and is secured by pins that
pass through the rooster sheave and main boom nose.
A 10 m to 17 m (32.6 ft to 56 ft) folding offsetable swingaway
boom extension is provided to obtain additional boom reach.
Boom extension can be set to 0°, 20°, and 40° offsets. An
optional insert is available for additional reach.
The bi-fold boom extension mounts directly to the boom
nose utilizing a four point attachment. In addition, the bi-fold
extension base section and/or fly section can be stowed on
the right side of the boom base section.
Reference Only

Manitowoc Grove GRT880 Specifications

General

Brand	Manitowoc
Model	Grove GRT880
Category	Construction Equipment
Language	English