Full Product Manual
Table of Contents Rev. 10/13/2022 LM MANUAL
Table of Contents Copyright 2020 Vestil Manufacturing Co. Page 12 of 25
FIG. 3C: LM-HRT- 4k & 6k Centers of Gravity and Maximum Load Ratings
for Varying Load Attachment Point and Boom Extension
Hook position A B C D E F G H I J K
Distance from end
of boom
30”
76 cm
36”
91 cm
42”
107 cm
48”
122 cm
54”
137 cm
60”
152 cm
66”
168 cm
72”
183 cm
78”
198 cm
84”
213 cm
90”
229 cm
Maximum rated load of a load suspended from a single hook located at the corresponding “Hook position”.
LM-HRT-4-24
4000 lb.
1820 kg
3750 lb.
1705 kg
3500 lb.
1590 kg
3250 lb.
1477 kg
3000 lb.
1363 kg
2750 lb.
1250 kg
2500 lb.
1136 kg
2250 lb.
1022 kg
2000 lb.
909 kg
1750 lb.
796 kg
1500 lb.
682 kg
LM-HRT-6-24
6000 lb.
2727 kg
5000 lb.
2273 kg
4500 lb.
2046 kg
4000 lb.
1818 kg
3500 lb.
1591 kg
3000 lb.
1363 kg
2600 lb.
1182 kg
2300 lb.
1046 kg
2000 lb.
909 kg
1800 lb.
818 kg
1550 lb.
705 kg
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 unloaded
. 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 and unloaded. 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
3
/
16
” (33.5 cm) 10” (25.4 cm) 38
11
/
16
” (98.3 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) 10
1
/
4
” (26 cm) 37
5
/
16
” (94.8 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
/
16
” (33.2 cm) 10
1
/
4
” (26 cm) 36
13
/
16
” (93.5 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
3
/
16
” (33.5 cm) 10
3
/
8
” (26.4 cm) 36
13
/
16
” (93.5 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
3
/
8
” (26.4 cm) 36
5
/
16
” (92.3 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
3
/
8
” (26.4 cm) 35
13
/
16
” (91 cm)
54
7
/
8
”-94
7
/
8
” 13” 44” 36” 7
1
/
4
”
2
1
/
4
”
79
13
/
16
”
1008.6 lb.