Manitowoc 3900W - Page 93

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Manitowoc Engineering Co.
JIB
LENGTHS Bu'rr TOP
Basic
30'
40'
50'
60'
BASIC JIB
PENDANT
33' 3-3/4"
I I 2
I I 2
I I 2
1 1 2
PARTS REQUIRED
For Various Jib Lengths
BACKSTAYS
See
"Backstay
Rigging "
10 FT.
INSERT
INSERT
PENDANT
9'6"
PINS
12
WIRE ROPE
ROLLER
GUIDE
16 3
FIG. 1112-3
Jib Offsets, in feet, are given in Fig. 1112-8.
ASSEMBLY
Lay the Boom Top on blocking on the ground. Install Jib
Adaptor to Boom Top, if required for your Boom. (See
Figs. 1112-9 to 14.)
-ASSEMBLE JIB, (and Inserts, if required), on blocking,
on the ground, pinning Jib Butt to Boom Top. ISee Figs.
1112-9 to 14.)
-PIN JIB STRUT TO JIB BUTT. Lay forward on Jib Butt.
-PIN JIB PENDANTS AND BACKSTAY STRAPS to Strut
Top with Pins furnished with Pendants. (See Table, Fig.
1112-5, and Detail on illustration, Fig. 1112-4.)
If Jib Inserts are used, add a pair of Insert Pendants to
the Jib Pendants for each 10-Ft. Insert used. (See Fig.
1112-3, for breakdown.)
-INSTALL A WIRE ROPE ROLLER GUIDE on each
Insert used.
-PIN THE OTHER END of Jib Pendants to the Jib Point.
JIB BACKSTAY RIGGING
PENDANT-TYPE BACKSTAYS:
New cranes equipped with Jibs have Pendant type back-
stays furnished as standard equipment because of the ease
of Offsetting to the proper angle. Jibs sold for use with
machines in the field often must use Wire Rope Backstays.
Parts used in the Pendant Backstay Assembly are shown
in Fig. 1112-5.
OFFSETTING WITH PENDANT BACKSTAYS:
Pinning the Basic Backstay Pendants between the Back-
stay Straps and properly located Jib Anchor Lugs, (See
"Jib Backstay Anchors"), sets the Jib at a nominal 0de-
gree Offset Angle.
-TO OFFSET TO 10 DEGREES, add the Offsetting Links
between the Anchor Lugs and the Basic Pendants. (Fig.
1112-5 & -6.)
-TO OFFSET TO 20 DEGREES, use the short Offsetting
Pendants between the Anchor Lugs and the Basic Pendants.
(Fig. 1112-5 &-6.)
BACKSTAY STRAPS
See Fig. 1112-5, Notes 1 & 2
for Straps to use.
J- 18"
• - 24;/~ '' ~j
"1
BACKSTAY
STRAPS
JIB PENDANT
TOP
JIB BACKSTAY
STRUT TOP DETAIL
RUBBER
BUMPER
FIG. 1112-4
REV. 10/27/71 123 JIB FOLIO 730-3
395143