Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-120 – JLG Lift – 3121262
3.19 SWING SPEED PROPORTIONING
Swing Speed Proportioning uses the boom length and angle
sensors to improve the comfort, speed and control of the turn-
table swing function. Turntable swing speed is increased as
the distance of the platform to the center of rotation is
decreased. This results in approximately constant platform
speeds regardless of boom position. Swing speed proportion-
ing 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 adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
3.20 CHASSIS TILT INDICATOR SYSTEM
The Chassis Tilt Indicator System measures the turntable angle
with respect to level ground. The tilt sensor (which is an inte-
gral part of the ground module) has two settings; 5.0 and 8.0
degrees. The smaller angle is used for the purpose of warning
the operator by means of the chassis tilt light in the platform
display panel. Additionally when used in conjunction with the
Beyond Transport - Drive Speed Cutback System, the tilt sen-
sor will cause an alarm to sound, and automatically put all
functions in the creep speed mode. With the exception of the
speed cutback, this is a warning system only. The machine will
continue to function. The operator is responsible to prevent
the machine from attaining an unstable position. The 8.0
degree angle is used exclusively for the purpose of automati-
cally shifting the drive motors to the maximum displacement
position (slow speed). The control system responds to indi-
cated angle readings 0.5 degrees smaller than the required
angles to account for calibration and sensor variation.
NOTE: For more detailed information concerning system adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
Figure 3-60. Swing Bearing Torque Sequence
NOTE: Swing Bearing Torque Sequence is typical for both inner and outer races.