SECTION 3 - CHASSIS & TURNTABLE
3-48
– JLG Lift –
3120740
h.
Carefully place the turntable on a suitably sup-
ported trestle.
i.
Use a suitable tool to scribe a line on the outer race
of the swing bearing and the frame. This line will aid
in aligning the bearing upon installation. Remove
the bolts and washers which attach the outer race of
the bearing to the frame. Discard the bolts. Use suit-
able lifting equipment to remove the bearing from
the frame, then move the bearing to a clean, suit-
ably supported work area.
2.
Installation.
a.
Using suitable lifting equipment, carefully lower the
swing bearing into position on the frame. Ensure
the scribed line of the outer race of the bearing
aligns with the scribed line on the frame. If a new
swing bearing is used, ensure that the filler plug fit-
ting is at 90 degrees from the fore and aft center line
of the frame.
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED BEARING BOLTS BE DIS-
CARDED AND REPLACED WITH NEW BOLTS. SINCE THE SWING BEARING IS THE
ONLY STRUCTURAL LINK BETWEEN THE FRAME AND TURNTABLE, IT IS IMPER-
ATIVE THAT SUCH REPLACEMENT HARDWARE MEETS JLG SPECIFICATIONS.
USE OF GENUINE JLG HARDWARE IS HIGHLY RECOMMENDED.
b.
Apply a light coating of JLG Threadlocker P/N
0100019 to the new bearing bolts, and loosely
install the bolts and washers through the frame and
outer race of bearing.
IF COMPRESSED AIR OR ELECTRICALLY OPERATED IMPACT WRENCH IS USED
FOR TIGHTENING THE BEARING ATTACHMENT BOLTS, THE TORQUE SETTING
ACCURACY OF THE TOOL SHOULD BE CHECKED PRIOR TO USE.
c.
Refer to the Torque Sequence diagram as shown in
Figure 3-39., Swing Bearing Torque Sequence. Clean
any residue off the new bearing bolts, then apply a
light coating of JLG Threadlocker P/N 0100019 and
install the bolts and washers through the frame and
outer race of the bearing. Tighten the bolts to an ini-
tial torque of 190 Ft. lbs. (260 Nm) w/JLG Thread-
locker P/N 0100019.
d.
Remove the lifting equipment from the bearing.
e.
Using suitable lifting equipment, carefully position
the turntable assembly above the machine frame.
f.
Carefully lower the turntable onto the swing bear-
ing, ensuring that the scribed line of the inner race
of the bearing aligns with scribed line on the turnta-
ble. 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.
Clean any residue off the new bearing bolts, then
apply a light coating of JLG Threadlocker P/N
0100019 and install the bolts and washers through
the turntable and inner race of the bearing.
h.
Following the Torque Sequence diagram shown in
Figure 3-39., Swing Bearing Torque 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 brackets,
apply a light coating of JLG Threadlocker P/N
0100011 to the attaching bolts and secure the yoke
to the turntable with the mounting hardware.
k.
Connect the hydraulic lines to the rotary coupling 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 system for
proper and safe operation.
Swing Bearing Torque Values
1.
Outer Race - 190 ft. lbs. (260 Nm) w/JLG Threadlocker P/
N 0100019.
2.
Inner Race - 190 ft. lbs. (260 Nm) w/JLG Threadlocker P/N
0100019.
3.
See Swing Bearing Torquing Sequence.
CHECK THE INNER AND OUTER SWING BEARING BOLTS FOR MISSING OR
LOOSENESS AFTER FIRST 50 HOURS OF OPERATION, AND EVERY 600 HOURS
THEREAFTER.
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