JLG 1250AJP Service Manual - Manual (Page 152)

SECTION 3 - 1CHASSIS & 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
comfort, speed and control of the turntable swing func-
tion. Turntable 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 constant platform speeds regardless of
boom position.
Swing speed proportioning is disabled with any envelope
sensors failure. Disabling of swing speed proportioning
will default to the slowest swing speed setting.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
Figure 3-56. Swing Bearing Torque Sequence
NOTE: Swing Bearing Torque Sequence is typical for both inner and outer races.