Manitowoc Grove GRT8120, Руководство оператора

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Grove
Published 3-22-2021, Control # 702-02
5-19
GRT8120 OPERATOR MANUAL SET-UP AND INSTALLATION
5
5. Insert wedge in loop. Pull live end of rope until wedge
and rope are snug inside socket. It is recommended
wedge be seated inside socket to properly secure the
hoist rope using the crane’s hoist to first apply a light
load to the live line.
6. After final pin connections are made, increase loads
gradually until wedge is properly seated.
7. Wire rope and wedge must be properly secured inside
socket before placing crane into lifting service. It is the
wedge that secures the hoist rope inside the socket. The
dead-end treatment is used to keep wedge from
becoming dislodged from socket should the rope
suddenly become unloaded from the overhaul ball or
hook block striking the ground, etc.
Figure 5-24 shows methods for securing dead-ends of hoist
ropes in a wedge socket assembly. While the loop-back
method (C, D, E) is acceptable, take care to prevent the loop
becoming entangled with tree branches and other
components during crane transport, or the anti two-block
system and other components during crane operation.
Of the methods shown, Grove prefers method A or F be used
on Grove cranes, i.e., clipping a short piece of hoist rope to
the dead-end or using a commercially available specialty clip
(1) or wedge (2). It is recommended the dead-end tail length
be a minimum of 6 rope diameters, but not less than 15.2 cm
(6 in) for standard 6 to 8 strand ropes. For rotation resistant
rope, the dead-end tail length must be a minimum of 20 rope
diameters, but not less than 15.2 cm (6 in).
When using method A, place a hoist rope clip around the
dead end by clamping a short extra piece of rope to the rope
dead end. DO NOT CLAMP LIVE END. U-bolt should bear
against the dead end. Clip saddle should bear against the
short extra piece. Torque U-bolts to values listed in .
NOTE: Use of swivels is not allowed with non-rotation
resistant hoist ropes
.
Other sources for information with which crane users should
be familiar and follow is provided by the American Society of
Mechanical Engineers, American National Standard, ASME
B30.5, latest revised. ASME (formerly ANSI) B30 applies to
cableways, cranes, derricks, hoists, hooks, jacks, and slings.
It states, in section 5-1.7.3, “(c) Swaged, compressed, or
wedge socket fittings shall be applied as recommended by
the rope, crane or fitting manufacturer.” Wire ropes are
addressed in ASME B30.5, section 5-1.7.2, ROPES, It
states, in pertinent part, “(a) The ropes shall be of a
c o n s t r u c t i o n r e c o m m e n d e d b y t h e r o p e o r c r a n e
manufacturer, or person qualified for that service.” Additional
information is published by the Wire Rope Technical Board in
Wire Rope Users Manual , latest revision.
.
FIGURE 5-24
A
B C
D
E F
1
2
Table 5-1 Wire Rope Clip Torque Values
Clip Size Torque*
mm In N-m ft-lb
3.18 1/8 6 4.5
4.76 3/16 10 7.5
6.35 1/4 20 15
7.94 5/16 40 30
13.28 3/8 60 45
11.11 7/16 90 65
12.70 1/2 90 65
14.29 9/16 130 95
15.88 5/8 130 95
19.05 3/4 175 130
22.23 7/8 300 225
25.40 1 300 225
28.58 1-1/8 300 225
31.75 1-1/4 490 360
38.68 1-3/8 490 360
38.10 1-1/2 490 360
*Torque values are based on threads being clean, dry,
and free of lubrication.