JLG 110HX ANSI Service Manual - Manual (Page 110)

SECTION 2 - PROCEDURES
2-86 – JLG Lift – 3120636
2. Boom Angle Sensor Adjustment
a. With the platform level, the boom fully retracted
and at 45 (+/- 1) degrees elevation, measure the
DC voltage at TP5 on the Load Radius Circuit
Card.
b. Loosen the three screws securing the sensor to
the box and rotate the sensor until 7.1 (+/- 0.1)
Volts DC is measured at TP5. Tighten the screws
on the sensor.
c. Return the boom to horizontal.
3. Radius Adjustment and Display Lights Setting Pro-
cedure
a. On the Load Radius Circuit Card, measure TP11
and adjust potentiometer P6 for a reading of 0.0
Volts DC.
b. On the Load Radius Circuit Card, measure TP8
and adjust potentiometer P2 for a reading of
2.128 Volts DC.
c. On the Load Radius Circuit Card, measure TP9
and adjust potentiometer P3 for a reading of
2.548 Volts DC.
d. Telescope the boom until the leading edge of
the yellow marking tape is exposed from the mid
boom. Adjust potentiometer P2 until the yellow
light just turns on and the blue light turns off.
e. Telescope the boom until the leading edge of
the red marking tape is exposed from the mid
boom. Adjust potentiometer P3 until the red light
just turns on and the yellow light turns off.
f. Measure TP2 and adjust potentiometer P4 until
TP7 measures 0.05 Volts DC more than TP2.
This determines the length of the boom (critical
length) where the lift down speed limiter is
turned on.
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2.31 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