JLG 740AJ Service Manual - Manual (Page 101)

SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-49
c. Refer to the Torque Sequence diagram as
shown in Figure 3-38., Swing Bearing Torque
Sequence. Spray a light coat of Safety Solvent
13 on the new bearing bolts. Then apply a light
coating of Loctite #271 to the new bearing bolts,
and install the bolts and washers through the
frame and outer race of the bearing. Tighten the
bolts to an initial torque of 190 Ft. lbs. (260 Nm)
w/Loctite.
d. Remove the lifting equipment from the bearing.
e. Using suitable lifting equipment, carefully posi-
tion the turntable assembly above the machine
frame.
f. Carefully lower the turntable onto the swing
bearing, ensuring that the scribed line of the
inner race of the bearing aligns with scribed line
on the turntable. If a new swing bearing is used,
ensure that the filler plug fitting is at 90 degrees
from the fore and aft center line of the turntable.
g. Spray a light coat of Safety Solvent 13 on the
new bearing bolts. Then apply a light coating of
Loctite #271 to the new bearing bolts, and
install the bolts and washers through the turnta-
ble and inner race of the bearing.
h. Following the Torque Sequence diagram shown
i n F i g u r e 3 - 3 8 . , S w i n g B e a r i n g To r qu e
Sequence., tighten the bolts to a torque of 190 ft.
lbs. (260 Nm) w/Loctite.
i. Remove the lifting equipment.
j. Install the rotary coupling retaining yoke brack-
ets, apply a light coating of Loctite #242 to the
attaching bolts and secure the yoke to the turn-
table with the mounting hardware.
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
the hydraulic system and check the swing sys-
tem for proper and safe operation.
Swing Bearing Torque Values
1. Outer Race - 190 ft. lbs. (260 Nm) w/Loctite.
2. Inner Race - 190 ft. lbs. (260 Nm) w/Loctite.
3. See Swing Bearing Torquing Sequence.
CHECK THE INNER AND OUTER SWING BEARING BOLTS FOR
MISSING OR LOOSENESS AFTER FIRST 50 HOURS OF OPERA-
TION, AND EVERY 600 HOURS THEREAFTER.
3.13 SWING HUB (PRIOR TO S/N
0300068040)
Disassembly
1. Loosen all 12 Cover Bolts (12) 8 (13) and drain the
oil from the unit.
2. Remove the 12 Cover Bolts (12) 8 (13) and lift off the
Cover (6). Remove and discard the o-ring (5) from
the counterbore of the Cover (6).
3. Remove the Input Gear (8) and Thrust Washer (10).
4. Lift out the Carrier Assembly (3) and top Thrust
Washer (11). This Thrust Washer (11) may stick to
the inside of the Cover (6).
5. Remove the Input Thrust Spacer (9).
6. Lift out the Internal Gear (2) and Thrust Washer (11).
The Thrust Washer (11) may stick to the under side
of the Carrier (3).
7. Remove the Retaining Ring (1I) from the Output
Shaft (1A) and discard.
EYE PROTECTION SHOULD BE WORN DURING RETAINING RING
(1L) REMOVAL.
8. Remove Bearing Shim (1H) from the Output Shaft
(1A).
9. The Output Shaft (1A) may now be pressed out of
the Hub (1G).