JLG 110HX ANSI Service Manual - Manual (Page 101)

SECTION 2 - PROCEDURES
3120636 – JLG Lift – 2-77
2.30 BOOM LENGTH/ANGLE SENSOR
ADJUSTMENT PROCEDURES
LOAD RADIUS CIRCUIT CARD P/N-0610106 WAS SUPERSEDED
WITH LOAD RADIUS CIRCUIT CARD P/N-0610130. ALTHOUGH
DIFFERENT IN COMPONENT LAYOUT AND POSITION OF TEST
POINTS, THE TEST POINTS ARE LABELED AND FUNCTION
EXACTLY THE SAME.
NOTE: The boom length/angle sensor is factory set and nor-
mally does not require adjusting unless it is removed
from the base boom for maintenance purposes, etc.
The boom length/angle sensor has been built to
three different configurations, hereafter referred to as
1st generation, 2nd generation and 3rd generation.
1st and 2nd Generation Radius Cards
100HX, 110HX
1. Length Indicator Adjustment.
a. With the engine running, check test point 10
(TP10).
b. Fully retract the boom and place in the 0 (+3/-0)
degrees horizontal position.
c. Set TP1 on the load radius circuit card to 1.8
Volts by adjusting trimpot TP1, then proceed
with the following adjustments.

Loosen Allen screws which anchor the timing
belt pulley (1st generation) or timing gear (2nd
generation) to the shaft of the 5K pot. On 3rd
generation sensor boxes, loosen the three
screws holding the pot in place. This enables
pot/pot shaft to move freely.

Turn the ignition switch on. Adjust the 5K pot/pot
shaft until the proper voltage appears at TP2 on
the load radius circuit card and also at the green
wire on the 5K pot. (See Table 2-5 for proper
voltage.)

Tighten the Allen screws on the timing belt pul-
ley/timing gear or tighten the three screws, as
applicable.









2. Boom Angle Sensor Adjustment.
a. With the boom completely retracted and in the 0
degrees horizontal position, measure the volt-
age at TP3 on the load radius circuit card and at
the yellow wire on the boom angle sensor.
b. Adjust the spring-loaded screw on the boom
angle sensor mounting plate (1st generation) or
the trimpot on the boom angle sensor (second
generation) until the voltage at TP3 on the load
radius circuit card and the yellow wire on the
boom angle sensor reaches the proper voltage.
For third generation sensor boxes, loosen the
three screws securing the sensor to the box and
rotate the sensor until the proper voltage read-
ing is obtained, then retighten the screws. (See
Table 2-5 for proper voltage.)
3. Radius Adjustment.
a. With the boom completely retracted and level
horizontal, telescope the boom until the yellow
marking tape on the mid boom is exposed.
b. At this point, measure the voltage at TP6 on the
load radius circuit card. This voltage represents
the critical radius from the center line of rotation.
c. Put the voltmeter probe on TP8 and adjust P2 on
the load radius circuit card until the voltage mea-
sured at TP6 is obtained at TP8. The yellow light
on the “Reach Display” should just turn on.
d. Continue extending the boom until the red mark-
ing tape on the mid boom is exposed
e. Measure the voltage at TP6 on the load radius
circuit card. This voltage represents the critical
radius from the center line of rotation.
f. Adjust P3 on the load radius circuit card until the
voltage measured at TP6 is obtained at TP9. The
red light on the “Reach Display” should just turn
on.
NOTE: If replacing the boom radius circuit card, P4 must be
set at the same voltage as P3. The test point for P4
voltage is TP7.