Service Manual Instruction Manual

SECTION 3 - CHASSIS & TURNTABLE
3-104 – JLG Lift – 3121171
3.21 SWING SPEED PROPORTIONING
Swing Speed Proportioning uses the main boom length
switches and envelope control sensors to improve the com-
fort, speed and control of the turntable swing function. Turn-
table swing speed is increased as the distance of the platform
to the center of rotation is decreased and when the tower
boom is lowered in angle. This results in approximately con-
stant platform speeds regardless of boom position.
Swing speed proportioning is disabled with any envelope sen-
sors failure. Disabling of swing speed proportioning will
default to the slowest swing speed setting.
NOTE: For more detailed information concerning system adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Figure 3-56. Swing Bearing Torque Sequence
NOTE: Swing Bearing Torque Sequence is typical for both inner and outer races.