JLG 120-SXJ ANSI Service Manual - Manual (Page 44)

SECTION 3 - CHASSIS & TURNTABLE
3-16 – JLG Lift – 3121105
flange nuts have been tightened too far. Loosen the
“X” nut and repeat steps 3 through 7.
Voltmeter Adjustment
1. Park machine on a flat, level surface. Ensure
machine is level and tires are filled to rated pressure.
2. If engine is not running, turn ignition switch to ON.
3. Connect black lead of voltmeter to ground and red
lead to yellow wire protruding from pot on bottom of
sensor.
4. Adjust leveling nuts to obtain the highest possible
voltage reading.
5. Check voltage at trip point in all four directions. If
voltage reading is not symmetrical, repeat step 4
above.
3.6 LOAD MANAGEMENT SYSTEM
The LMS (Load Management System) consists of three
independent systems.
Platform Position Indication System
This system illuminates one of the two lamps in the plat-
form position display located on both the platform console
and ground control box. A blue light is used to indicate
that the platform is within the permitted operating enve-
lope and a red light is used to indicate when the platform
is outside the permitted operating envelope. Either the
blue or red light should be illuminated at all times.
The elevation angle is sensed by means of a pendulum
potentiometer and the extension of the boom sensed by a
multi-turn potentiometer driven by means of a cable
attached to the telescoping part of the boom. Both of
these sensors are situated at the rear of the base boom
section and housed in a sealed steel box.
The signals from these sensors (elevation angle and
extension distance) are fed into a load radius card which
calculates the boom radius.
Boom Radius = Boom Length x Cos Boom Angle