01/11
rev. 3/6/2017
LM, MANUAL
Copyright 2016 Vestil Manufacturing Co.
Page 12 of 28
FIG. 3C: LM-HRT- 4k & 6k Centers of Gravity and Maximum Load Ratings for
Varying Load Attachment Point and Boom Extension Combinations
Hook
position A B C D E F G H I J K
Distance from end
of boom
30”
(76cm)
36”
(91cm)
42”
(107cm)
48”
(122cm)
54”
(137cm)
60”
(152cm)
66”
(168cm)
72”
(183cm)
78”
(198cm)
84”
(213cm)
90”
(229cm)
Maximum rated load of a load suspended from a
single
hook located at the corresponding “Hook position”.
LM-HRT-4-24
4000 lb.
(1820kg)
3750 lb.
(1705kg)
3500 lb.
(1590kg)
3250 lb.
(1477kg)
3000 lb.
(1363kg)
2750 lb.
(1250kg)
2500 lb.
(1136kg)
2250 lb.
(1022kg)
2000 lb.
(909kg)
1750 lb.
(796kg)
1500 lb.
(682kg)
LM-HRT-6-24
6000 lb.
(2727kg)
5000 lb.
(2273kg)
4500 lb.
(2046kg)
4000 lb.
(1818kg)
3500 lb.
(1591kg)
3000 lb.
(1363kg)
2600 lb.
(1182kg)
2300 lb.
(1046kg)
2000 lb.
(909kg)
1800 lb.
(818kg)
1550 lb.
(705kg)
The center of gravity of the boom changes as boom length changes. As shown in the diagram below, the horizontal center of
gravity may be located at any point from RHCG to EHCG:
Retracted horizontal center of gravity (RHCG): boom fully
retracted
, and load attached at position A. RHCG is measured from
the “origin point” of the above diagram (edges of the fork pockets);
Extended horizontal center of gravity (EHCG): boom fully
extended
with a load attached at position J. EHCG is also measured
from the “origin point” of the above diagram (edges of the fork pockets);
All other combinations of boom extension and load position produce a horizontal center of gravity located somewhere between
RHCG and EHCG.
K
J
I
H
G
F
E
D
C
B
A
FIG. 3D:
LM-HRT centers of gravity and dimensions
Model
Extended
horizontal center
of gravity
Retracted
horizontal center
of gravity
Vertical center
of gravity
A B
C
D
E
F
G
Net
weight
LM-HRT-4-24 13
1
/
8
” (33.3 cm)
9
15
/
16
” (25.2 cm) 31
5
/
8
” (80.3 cm) 54
7
/
8
”-94
7
/
8
” 13” 32” 24” 7
1
/
2
” 2
1
/
2
” 79
13
/
16
” 943.7 lb.
LM-HRT-4-30 13
1
/
8
” (33.3 cm)
9
15
/
16
” (25.2 cm) 31
5
/
8
” (80.3 cm) 54
7
/
8
”-94
7
/
8
” 13” 38” 30” 7
1
/
2
” 2
1
/
2
” 79
13
/
16
” 958.9 lb.
LM-HRT-4-36 13
1
/
8
” (33.3 cm)
9
15
/
16
” (25.2 cm) 31
5
/
8
” (80.3 cm) 54
7
/
8
”-94
7
/
8
” 13” 44” 36” 7
1
/
2
” 2
1
/
2
” 79
13
/
16
” 974.1 lb.
LM-HRT-6-24 13
1
/
8
” (33.3 cm)
10
1
/
16
” (25.6 cm) 30
3
/
4
” (78.1 cm) 54
7
/
8
”-94
7
/
8
” 13” 32” 24” 7
1
/
4
” 2
1
/
4
” 79
13
/
16
” 978.2 lb.
LM-HRT-6-30 13
1
/
8
” (33.3 cm)
10
1
/
16
” (25.6 cm) 30
3
/
4
” (78.1 cm) 54
7
/
8
”-94
7
/
8
” 13” 38” 30” 7
1
/
4
” 2
1
/
4
” 79
13
/
16
” 993.4 lb.
LM-HRT-6-36 13
1
/
8
” (33.3 cm)
10
1
/
16
” (25.6 cm) 30
3
/
4
” (78.1 cm) 54
7
/
8
”-94
7
/
8
” 13” 44” 36” 7
1
/
4
” 2
1
/
4
” 79
13
/
16
” 1008.6 lb.
