JLG 40H Service Manual - Manual (Page 82)

SECTION 2 - PROCEDURES
2-62
– JLG Lift – 3120240
bearing to the turntable. Tighten the nuts and
bolts or clamp evenly in a diametrical pattern to
a torque of 20 ft. lbs. (2.78 kgm).
k. Allow Devcon filler to cure at room temperature
(approximately 70 degrees F., 21 degrees C.) for
10 to 16 hours.
l. After the appropriate time interval, place a suit-
abl e hydraulic jack under t he be aring and
release the clamps or remove the nuts and bolts,
use the hydraulic jack to carefully remove the
bearing from the turntable.
m. Carefully remove excess filler from the turntable
mounting area, from the bearing attachment
holes and from between gear teeth.
n. Position the bearing on the machine frame in the
same position as noted in step (c) above.
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED BEARING
NUTS AND BOLTS BE DISCARDED AND REPLACED WITH NEW
NUTS AND BOLTS. SINCE THE SWING BEARING IS THE ONLY
STRUCTURAL LINK BETWEEN THE FRAME AND TURNTABLE, IT
IS IMPERATIVE THAT SUCH REPLACEMENT HARDWARE MEETS
JLG SPECIFICATIONS. USE OF GENUINE JLG HARDWARE IS
HIGHLY RECOMMENDED.
o. Spray a light coat of Safety Solvent 13 to the
new bearing bolts. Then apply a light coating of
Loctite #271 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 ATTACH-
MENT BOLTS, THE TORQUE SETTING ACCURACY OF THE TOOL
SHOULD BE CHECKED PRIOR TO USE.
p. Following the Torque Sequence diagram shown
in Figure 2-35, tighten the bolts an torque bolts
to 80 ft. lbs. (109 NM) wet.
q. remove the lifting equipment from the bearing.r.
r. Use suitable lifting equipment to carefully posi-
tion the turntable assembly above the machine
frame.
s. Carefully lower the turntable onto the swing
bearing, ensuring that the turntable and bearing
align as noted in step (i) above.
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.
t. Spray a light coat of Safety Solvent 13 to the
new bearing bolts. Then apply a light coating of
Loctite #271 to the new bearing bolts, and
install the bolts, washers and nuts through the
turntable and inner race of the bearing.
u. Following the Torque Sequence diagram shown
in Figure 2-35, tighten the bolts an torque bolts
to 170 ft. lbs. (231NM) wet.
v. Remove the lifting equipment.
w. Install the rotary coupling retaining yoke, apply a
light coating of Loctite Sealant #TL277-41 to the
attaching bolts and secure the yoke to the rotary
coupling with the bolts and lockwasher.
x. Connect the hydraulic lines to the rotary cou-
pling as tagged prior to removal.
y. At ground control station, use boom lift control
to lower boom to stowed position0.
z. Using all applicable safety precautions, activate
the hydraulic system and functionally check the
swing system for proper and safe operation.
Swing Bearing Torque Values.
1. Outer Race - 80 ft. lbs. (109 NM) wet.
2. Inner Race - 170 ft. lbs. (231 NM) wet.
3. Swing Bearing Torquing Sequence, see Figure 2-35.
RETORQUE THE INNER AND OUTER SWING BEARING BOLTS
AFTER FIRST 200 HOURS OF OPERATION, AND EVERY 500
HOURS THEREAFTER.