JLG X20JP - X600AJ Service Manual - Manual (Page 50)

SECTION 3 - CHASSIS & TURNTABLE
3-26 – JLG Lift – 3121623
7.
Figure 3-32. Check the support surface
BOLTING THE SLEW DRIVE
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.
MOUNT THE SLEW DRIVE IN UNSTRESSED STATE.
Strictly comply with the procedure specified below to
avoid impermissible deviations between the bolt tighten-
ing forces:
FIRST FASTEN THE HOUSING, THEN FASTEN THE
TOOTHED BEARING RING!
8. Use medium strength Loctite (Loctite 243) on
screws.
9. Pretension the bolts, with washers if required, cross-
wise in 3 steps, 30%, 80%, and 100% of the tighten-
ing torque, or the hydraulically applied pretension
force.
10. In this process turn the unscrewed ring several
times. Repeat the procedure for the bearing ring that
has not yet been bolted.
If using a hydraulic bolt-tensioning cylinder the tensioning
forces for the bolt pretension should not exceed 90% of
yield strength.
Figure 3-33. Tighten crosswise
Table 3-6.
Mounting
bolt dimen-
sions
Mounting pretension force
F
M
1)
Strength class 10.9 in
kN lbs
M24 282 63396
M27 367 82505
M30 448 100714
M33 554 124544
M36 653 146800
M42 896 201429
M45 1043 234476
M48 1177 264600
M52 1405 315857
M56 1622 364640
M60 1887 424215
M64 2138 480642
M68 2441 548759