JLG 110HX ANSI Service Manual - Manual (Page 106)

SECTION 2 - PROCEDURES
2-82 – JLG Lift – 3120636
2. Boom Angle Sensor Adjustment.
a. With the boom completely retracted and in the 0
(+3/-0) degrees horizontal position, measure
the voltage at TP3 on the load radius circuit card
and at the yellow wire on the boom angle sen-
sor.
b. Adjust the spring-loaded screw on the boom
angle sensor mounting plate (1st generation) or
the trim pot on the boom angle sensor (2nd gen-
eration) 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 the 3rd 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 in the 0
(+3/-0) degrees horizontal position, telescope
the boom until the yellow marking tape on the
mid boom is exposed.
b. At this point, measure the voltage at TP2 on the
load radius circuit card. Record the voltage. This
voltage represents the critical radius from the
center line of rotation.
c. With the boom still in the horizontal position,
telescope outward until the red marking tape is
exposed from the mid boom.
d. Measure the voltage at TP2 on the load radius
circuit card. Record the voltage. This voltage
represents the critical radius from the center line
of rotation.
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e. Do the following subtraction:
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Subtract the voltage when the yellow tape is
exposed from the voltage reading when the red
tape is exposed. This is the voltage difference.
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(Voltage when red tape is exposed — voltage
when yellow tape is exposed = voltage differ-
ence)
f. Put the voltmeter probe on TP11 and adjust trim-
pot six (P6) until the “Voltage Difference” is
seen.
g. With the boom still in the horizontal position and
extended to the red tape, put the voltmeter
probe on TP8 and adjust P2 to the same voltage
as TP6. The red light on the “Reach Display”
should just turn on.
h. With the voltmeter probe on TP7, adjust P4 until
the voltage that was measured at the red tape
position on TP2 is seen. This determines the
length of boom (critical length) where the “Lift
Down Speed Limiter” is turned on.
i. Finally, put the voltmeter on TP9 and adjust P3
to 3 volts greater than the setting of TP8.
4. Operational Check.
a. Raise the boom completely and fully extend the
boom.
b. Engage auxiliary power.
c. Engage LIFT DOWN until the blue light turns off
and the red light turns on. When the red light
turns on, shut down the machine and check the
boom angle. The boom angle should be 62-65
degrees. If the boom angle is within this range,
the boom angle/length indicator system is oper-
ating properly and requires no further adjust-
ment. If the boom angle is not within this range,
contact the JLG Service Department for further
assistance.