JLG 1500SJ Service Manual - Manual (Page 491)

SECTION 6 - JLG CONTROL SYSTEM
3121262 – JLG Lift – 6-39
Sensor #3 - Main Boom Length Sensor
This sensor measures total stroke of the Main Boom. It is
located in the rear of the Base Boom and consists of a
small wire rope and a rotating drum.
Sensor #4 - Main Boom Cylinder Angle
Sensor
This sensor's function is to measure Main Boom angle in
relationship to the turntable. A rotary type sensor is
mounted to the Turntable and attached to the Main lift cyl-
inder. This sensor is used for velocity control only.
Sensor #5 - Main Boom Transport Length
Switch
This switch is used to indicate the Main Boom is in the
retracted position for transport. This sensor is a mechani-
cal limit switch.