Manitowoc Published 06-24-16, Control # 241-01 4-137
2250 OPERATOR MANUAL SETUP AND INSTALLATION
LOAD BLOCK TIE-BACK
General
See Figure 4-79 for the following information.
A lug is provided on the front of the rotating bed (see View A)
and on the luffing hoist frame (see View B) for tying back the
load block when not in use.
Specifications
Sling Length
The sling should be long enough to connect it to a shackle in
the tie-back hole and to the hook of the freely suspended
load block. This will prevent personnel from having to swing
the block in, toward the crane, to make the connection.
Sling Capacity
The sling must be capable of supporting the weight of the
load block and half the weight of the wire rope suspended
from the boom point. When sizing the sling, take into account
the dynamic effects of traveling and swinging the crane. It is
the crane user’s responsibility to calculate this load.
Shackle
See Figure 4-79 for identification of the tie-back hole
diameter and the shackle size.
Dead-End
Socket and
Wedge (typical)
3
2
1
Item Description
1 Dead-End Link
2 Lug
3 Universal Anchor Joint
FIGURE 4-78
CAUTION
Avoid Boom Damage!
• Haul in the load line just until the tie-back sling is taut.
The only purpose of the tie-back is to prevent the load
block from swinging when not in use.
• Do not tighten the load line to a point that the load line
can rub against the lacings in the boom section or the
load block can bounce into the lacings.
The operator shall be aware that when booming
down, the load lines and tie-back sling will tighten
even more. Pay out the load line while booming down
to prevent the load block from being pulled into the
boom. Damage to the lacings or chords could result.
• Make sure that the tie-back sling, load block, and load
lines do not interfere with the operation of the luffing
hoist wire rope.
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