Manitowoc Published 10-01-12, Control # 044-05 4-79
777 OPERATOR’S MANUAL SET-UP AND INSTALLATION
4
LOAD BLOCK TIEBACK
Manitowoc provides a lug on the front of the rotating bed
(Figure 4-51, View A) for tieing back the load block when not
in use.
Specifications
Shackle
See Figure 4-51 for identification of tieback hole diameter
and shackle size.
Sling Length
The sling must be long enough to connect it to a shackle in
the tieback hole and to the hook of the freely suspended load
block. This will prevent personnel from having to swing the
block in, toward crane, to make the connection.
Both pins and two slings must be used to prevent side
loading boom.
Sling Capacity
The slings must be capable of supporting the weight of the
load block and 1/2 the weight of the wire rope suspended
from the boom point. When sizing slings, take into account
the dynamic affects of traveling and swinging the crane. It is
the crane users responsibility to calculate this load.
CAUTION
Avoid damage to boom:
• Haul in load line only until tieback sling(s) is taut.
Purpose of tieback is only to prevent load block from
swinging when not in use.
• Do not tighten load line to point that load line rubs
against lacings in boom sections or load block can
bounce into lacings.
Operator, be aware that as you boom down load lines and
tieback sling will tighten even more. Pay out load line
while booming down so that you don’t pull load block into
boom. Damage to lacings or chords could result.
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