JLG 1850SJ Service Manual - Manual (Page 319)

SECTION 6 - JLG CONTROL SYSTEM
3121619 – JLG Lift – 6-37
6.6 CONTROL SYSTEM BOOM SENSORS
The Boom Control System (BCS) requires the use of multiple
sensors to measure the position of the boom. The sensors
used to determine main boom and jib boom position are
shown in the following figures.
THE CONTROL SYSTEM MUST BE RECALIBRATED AFTER REPLACING OF ANY
SENSOR.
Sensor #1 - Load Pin (1)
The Main Lift Cylinder is attached to the Turntable with a load
cell pin. This pin is fixed to the Turntable so as to allow mea-
surement of the force exerted by the cylinder regardless of the
cylinder orientation.
Sensor #2 - Main Boom Angle Sensors (2)
See (See Figure 6-18.)
These sensors measure Main Boom angle with respect to grav-
ity. They are located in the rear of the Section #1boom and
mounted such that they generate opposing signals with
respect to boom movement.
Sensor #3 - Main Boom Length Sensor (1)
This sensor is used to measure total stroke of the Main Boom.
It is located in the rear of the Base Boom and consists of a wire
rope attached to a rotating drum.