Swing Bearing Torque Values; Swing Drive Checks - JLG t350 Service And Maintenance Manual

shown below. Tighten all bolts to an initial torque of
115 ft.lbs. (155 Nm) w/Loctite.
Figure 3-18. Short Bolts
10. Remove the lifting equipment from the bearing.
11. Using suitable lifting equipment, carefully position
the turntable assembly above the machine frame.
12. 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.
13. 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 turntable and inner race of
the bearing.
14. Following the Torque Sequence diagram shown in
Figure 3-19., Swing Bearing Torque Sequence,
tighten the bolts to a torque of 130 ft.lbs. (180 Nm)
w/Loctite.
15. Remove the lifting equipment.
16. Connect the hydraulic lines to the fittings on the
turntable as tagged prior to removal.
17. At ground control station, use boom lift control to
lower boom to stowed position.
18. 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 - 130 ft.lbs. (180 Nm)
2. Inner Race - 130 ft.lbs. (180 Nm)
3. See Swing Bearing Torquing Sequence.
3121198
CHECK THE INNER AND OUTER SWING BEARING BOLTS FOR
MISSING OR LOOSENESS AFTER FIRST 50 HOURS OF OPERA-
TION, AND EVERY 600 HOURS THEREAFTER.
THESE TWO BOLTS
ARE SHORTER
THAN THE REST
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE

Swing Drive Checks

There are three visual checks that can be used to deter-
mine if the swing drive is worn. Gently rock the boom back
and forth and look for the following:
1. Movement of the turntable gear (this indicates the
motor is spinning due to a worn out motor or air in
the lines)
2. Rotation of the Screw Shaft
3. Screw shaft moving in and out of the end plate
1
2
3
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