JLG 120-SXJ Service Manual - Manual (Page 68)

SECTION 4 - BOOM & PLATFORM
4-20 – JLG Lift – 3121810
(critical length) where the lift down speed limiter is
turned on.
4.9 BOOM LOAD RADIUS SETUP
PROCEDURES - 120SXJ
NOTE: The boom length and angle sensor adjustments
need to be made before the display lights are
adjusted.
The boom length and angle sensor is factory set and
does not normally require adjusting unless it is
removed from the base boom for maintenance.
Length Indicator Adjustment
1. Level the frame before beginning any adjustments.
2. Make all adjustments with the engine running unless
otherwise noted.
3. Fully retract the boom.
4. On the Load Radius Circuit Card, measure TP10 and
insure that 10 (+0.1/-0) Volts DC is present.
5. On the Load Radius Circuit Card, adjust P1 to 1.223
Volts DC while measuring TP1.
6. Make the following adjustment with the power off.
On the Load Radius Circuit Card, disconnect con-
nector J2 (the 6 pin connector on the printed circuit
board). Measure between Pin (6) of the socket on
the circuit board and ground (TB1-1), adjust potenti-
ometer P5 to a value of 1915 (+/- 5) Ohms. Recon-
nect J2 when adjustment is complete.
7. Turn the power on and measure TP2. It should be
1.287 Volts DC. Re-adjust the 5K Ohm potentiometer
in the boom cable reel if necessary. Adjust the 5K
Ohm potentiometer by loosening the three screws
holding it in place. Tighten the three (3) screws
when adjustment is complete.