Manitowoc Grove RT880E User Manual

Grove Published 11-10-2014, Control # 524-00 4-1
RT880E SERVICE MANUAL BOOM
4
SECTION 4
BOOM
SECTION CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Lattice Extension . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Optional Lattice Extension Inserts . . . . . . . . . . . . 4-1
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Boom Extension . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Boom Retraction . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Boom Disassembly . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Boom Nose Sheaves . . . . . . . . . . . . . . . . . . . . . 4-10
Boom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Functional Check . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Boom Alignment and Servicing. . . . . . . . . . . . . . 4-15
Cam Operated Check Valve Adjustment . . . . . . 4-15
Stop Block Adjustment . . . . . . . . . . . . . . . . . . . . 4-15
Front Upper Pad Adjustment . . . . . . . . . . . . . . . 4-15
Read Side Wear Pad Adjustment . . . . . . . . . . . . 4-15
Boom Extension and Retraction Cable . . . . . . . 4-16
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16
Telescope Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . 4-18
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Lift Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Theory of Operation. . . . . . . . . . . . . . . . . . . . . . . 4-21
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Auxiliary Boom Nose . . . . . . . . . . . . . . . . . . . . . . 4-25
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
Installing the Bi-Fold Manual Boom Extension . 4-25
Checking the Transport Condition . . . . . . . . . . . . 4-28
Boom Extension Erecting and Stowing
Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
Monthly Maintenance Work . . . . . . . . . . . . . . . . . 4-28
Hook Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
DESCRIPTION
One boom is available on the crane; a four section, full
power, sequenced and synchronized, 41 to 128 ft (12.6 to
39.0 m) boom (see Figure 4-1). The boom assembly utilizes
a mega form design. 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 lift is provided by a single
lift cylinder and boom elevation is from - 3 degrees to +78
degrees.
A standard auxiliary boom nose (rooster sheave) is 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.
Lattice Extension
A 33 to 56 ft (10.1 to 17.1 m) offsettable bi-fold lattice
swingaway extension, offsets 0°, 20°, and 40° and stows
alongside the base boom section.
Optional Lattice Extension Inserts
Two optional 20 ft (6.1 m) lattice extension inserts are
available. The non-stowable inserts install between the
boom nose and bi-fold extension.
THEORY OF OPERATION
Boom Extension
Boom extension and retraction is accomplished with two
telescope cylinders, five extension cables, and two retraction
cables. The lower telescope cylinder rod is secured to the
rear of the boom base section and the barrel is secured to
the inner mid boom section by a trunnion. The upper
telescope cylinder rod is secured to the rear of the inner mid

Manitowoc Grove RT880E Specifications

General

Brand	Manitowoc
Model	Grove RT880E
Category	Construction Equipment
Language	English