JLG X23J - X700AJ Service Manual - 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