JLG 120HX Service Manual - Manual (Page 57)

SECTION 2 - PROCEDURES
3120819 – JLG Lift – 2-35
IF COMPRESSED AIR OR ELECTRICALLY-OPERATED IMPACT
WRENCH IS USED FOR TIGHTENING THE BEARING ATTACH-
MENT BOLTS, THE TORQUE SETTING ACCURACY OF THE TOOL
SHOULD BE CHECKED PRIOR TO USE.
g. Apply a light coating of Loctite #277 to the new
bearing bolts, and install the bolts, washers and
nuts through the turntable and inner race of the
bearing.
h. Following the Torque Sequence diagram shown
in Figure 2-6, tighten the bolts to an initial torque
of 176 Nm (130 ft. lb.). Then following the same
sequence tighten the bolts to a final torque of
230 Nm (170 ft. lb.) wet.
i. Remove the lifting equipment.
j. Install the rotary coupling retaining yoke; apply a
light coating of Loctite Sealant Number TL277-
41 to the attaching bolts and secure the yoke to
the rotary coupling with the bolts and lockwash-
ers.
k. Connect the hydraulic lines to the rotary cou-
pling as tagged prior to removal.
l. At ground control station, use boom lift control
to lower boom to stowed position.
m. Using all applicable safety precautions, activate
hydraulic system and functionally check swing
system for proper and safe operation.
Swing Bearing Torque Values
1. Outer Race - 230 Nm (170 ft. lb.) wet, 298 Nm (220
ft. lb.) dry.
2. Inner Race - 230 Nm (170 ft. lb.) wet, 298 Nm (220 ft.
lb.) dry.
3. See Figure 2-18. for swing bearing bolt torquing
sequence.
RETORQUE INNER AND OUTER SWING BEARING BOLTS TO 220
FT. LB. (298 NM) AFTER FIRST 200 HOURS OF OPERATION AND
EVERY 500 HOURS THEREAFTER.
2.18 DRIVE TORQUE HUB
Disassembly
1. Position hub over suitable container and remove
drain plug (108) from unit. Allow oil to completely
drain.
2. Remove sixteen bolts (17), four socket head bolts
(18), and twenty lockwashers (20) from cover (301)
and lift cover from unit. Remove o-ring (5) from
counterbore of cover.
3. Disassemble cover (6) as follows:
a. Remove two bolts (303) securing disconnect
cap (304) to cover and remove disconnect
cover.
Figure 2-18. Swing Bearing Bolt Torquing Sequence