Manitowoc Engineering Co.
(4)
JIB BACKSTAY RIGGING
JIB
OFFSET
Degrees
0
10
20
BACKSTAY
LENGTH
DIMENSION "L"
(See Fig. 1112-6)
Sum: Col's. I, 2, 3,&4
51'-2"
53'-6"
55'-10"
(1)
BACKSTAY
STRAP
Notes I & 2
10"Long
2
(2)
BASIC BACKSTAY
PENDANT
Notes 2,3. &6
50'-4"Lon R
NOTE: !. 'Pendant Backstay rigged
Booms
with Offset Tops'
Fig.
1,112-4).
2.
~3.
4.
5.
6.
7.
(3)
JIB
OFFSETTING
LINK
2'-4" Lonq
(4)
JIB
OFFSETTING
PENDANT
4'-8" Lon,q 71-1/4" L~.
0 2
0 0
2 0
JiB STOP,
PENDANT,
LINK,
OR
BUMPER
( N ore 4)
requii'e longer Backstay Straps:
(See
67-5/8" Lq.
a. No. 9, 9A, 22,
22A
Booms
w/4~ ° Offset - use (2) 18" Jib Backstay Straps
b. No. 17 . Booms w/4 ° Offset - use (.2)
24W'
Jib Backstay Straps :
Wire Rope Backstay rigged Booms all use 10" Backstay Straps.
Boom No. 9A - 3 Ft. Hammerhead- Deep Section, requires a Basic Pendant
66'-7" Long.
(Total Lengths, Dim. "L" - 10 degrees - 67'-5". 20 degrees - 69'-9".) DO NOT SET AT 0 °.
Jib Stop
on a
9A-3 Ft. Hammerhead Deep Section Boom is a 2-part Link, (See Fig. 1112.11).
(2 Required.)
Jib Stop on a 22-22A Hammerhead, 2-piece Boom is a Rubber Bumper Assy.,
(See
Fig. i ! 12-13).
(2 Required. )
Dimensions shown are from Hole Center to Hole Center.
If 8" Adaptor Link is used at Jib Backstay Anchor Lug, use Basic Backstay Pendant 8" Shorter,
i.e., 49' 8"
Long. (Wire Rope Rigging will
not
require
an
Adaptor Link.)
Boom No. 22A Hammerhead, requires a Basic Pendant 50'-4" long, a I0" Backstay Strap,
PLUS a 12" Link. (Total Lengths, Dim.
"L"
- 5 degrees
- 52':2",)
For 10 & 20 degree off_
sets - see
above table. DO NOT SET AT 0 °.
J
FIG. 1112-5
NOTE:
The Offset Jib Angles, O, 10 and 20 degrees re-
ferred to herein, and in the Lift Capacity Charts
are
nominal,
and
for reference
only.
Lift
Capac-
ities,
and
the "Offsets in Feet", (Fig. !112-8),
make use of the total Backstay lengths given, (Di-
mension
"L ", Fig. 1112-5 & 6), to figure the Point
position. The "Offset Angle" may vary with the
Jib length,
and
other factors.
-PIN THE BACKSTAY PENDANTS to the Backstay Straps
at the top of the Strut.
-ADD OFFSETTING LINKS, OR PENDANTS, if required.
Pin to the Jib Backstay Anchor Lugs.
JIB BACKSTAY ANCHOR
LUGS
On some older Boom Inserts, you may find Jib Backstay
Anchors that have a i-9/16" diameter hole that will not
accept the 2" diameter Pins now used for Pendant rigging.
To rig with Pendant type Backstays, use Adaptor Links
at the Anchors, which have a hole for each size Pin,
spaced on 8" Centers. Use a Basic Backstay Pendant 8"
shorter, (Fig. 1112-5, note 6).
When rigging With Wire Rope Bac.kstays, no Adaptor
Link is required. Pins furnished may be used in either
size hole.
ANCHOR LOCATIONS The location of the Anchor, on
the Insert as shown in Fig. 1112-6, Dimension "D" may
not be at the position shown. Since this location is used to
determine the proper Backstay length to use for the var-
ious Offsets,
check the location
before rigging! On older
Booms in the field this location may be different from the
Dimension "D" shown in the table which is now standard
on present and recent equipment.
CONSULT THE FACTORY if the Dimension "D" is not
as shown. If you tell them where your Backstay Anchor
Lugs are located, they can advise if Wire Rope Backstays
can be used, and how long to rig them for 0, 10, and 20
degree Offset Angles.
WIRE ROPE BACKSTAYS
Where Pendant Backstay assemblies are not available,
as in some field applications, Wire Rope of the specified
grade and size may be used with Wedge Sockets to set
the Backstay length.
FOLIO
730-4 123 JIB ::~ REV. 4/24/73
395143
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