JLG X23J - X700AJ Service Manual User Manual
Page 140
SECTION 3 - CHASSIS & TURNTABLE
3121448
– JLG Lift –
3-113
M O U N T I N G S T R U C T U R E S W I T H F R A C T U R E
STRENGTH UNDER 500 N/MM² OR 72520 LBS/IN² ARE
PROHIBITED.
ds = bolt diameter
lk = grip length
le = insertion depth
Permissible interfacial pressure for various materials
TIGHTENING BOLTS WITH A TORQUE WRENCH
Normally the mounting bolts are adequately secured
through correct pretension.
DO NOT USE IMPACT SCREWDRIVERS. USING AN IMPACT
SCREWDRIVER MAY CAUSE IMPERMISSIBLE DEVIATIONS
BETWEEN THE BOLT TIGHTENING FORCES. FAILURE OF THE
BOLTED UNION WITH THE MOUNTING STRUCTURE MAY CAUSE
SEVERE PERSONAL INJURY OR MATERIAL DAMAGE.
IMPORTANT
IF THERE ARE SHOCK LOADS OR VIBRATION ADDI-
TIONAL SCREW- LOCKING DEVICES MAY BE NECES-
SARY. IN THIS CASE USE LOCTITE OR NORD-LOCK®
BOLT LOCK WASHERS.
• Do not use split rings, spring washers, etc.
• Do not reuse bolts, nuts, and washers, etc.
• Only use hardened and tempered washers.
• Adjust the limit torque in accordance with bolt size and
quality.
• Use a precisely indicating torque wrench.
Tightening torques and bolt tightening forces for met-
ric coarse-pitched thread in accordance with DIN 13
when using a torque wrench:
Material
Max. surface pressure
in N/mm²
in lbs/in²
St52/C45N/46Cr2N
600
87023
46Cr4V/42CrMo4V
800
116030
Mounting bolt
dimensions
Tightening torque
M
A
1)
Strength class 10.9
in
Mounting pretension
force F
M
2)
Strength
class 10.9
in
Nm
ft-lbs
kN
lbs
M4
3.31
2.44
5.95
1338
M5
6.77
4.99
9.74
2190
M6
11.5
8.5
13.7
3080
M8
28.0
20.6
25.2
5665
M10
55.8
41.2
40.2
9037
M12
97.7
72.1
58.5
13151
M16
246
181
111
24954
M18
336
248
134
30124
M20
481
355
173
38892
M22
661
487
216
48559
M24
830
612
249
55977
M27
1230
907
328
73737
M30
1661
1225
398
89474