JLG 680S Service Manual - Manual (Page 238)

SECTION 4 - BOOM & PLATFORM
4-44 – JLG Lift – 3121234
4.8 LOAD SENSING DEVICE
Calibrating the Load Sensor
NOTE: Refer to Section 6 - JLG Control System.
1. Place the boom in the following position.
a. Boom - Stowed
b. Telescope - In
c. Jib - 0 Degrees
d. Swing - 0 Degrees
e. Basket Level - 0 Degrees
f. Basket Rotate - 0 Degrees
g. Weight in Basket - 0
h. Machine parked on firm, level surface
2. Activate both emergency stop switches and turn the
key switch to the platform position.
3. Remove all loads from the platform, including the
operator.
4. Turn P1 clockwise (in) until the potentiometer begins
to click.
5. Plug the analyzer into the port in the platform.
6. Select Access Level from Main Menu.
7. Enter 33271.
8. Select Machine Set-Up>Load Cell>1 Warn Only.
9. Select Machine Diagnostics>System Load Cell on
the Analyzer.
10. Adjust P2 until the Load = 0%.
11. Place 525 lbs. (238 kg) in the center of the basket.
12. Adjust P1 until the Load = 100%
13. Verify that the overload indicator lights continuously
and the alarm sounds continuously during an over-
load condition.
14. Remove the weight from the platform.
15. Adjust P2 until the Load = 0%.
16. Place 525 lbs. (238 kg) in the center of the basket.
17. Adjust P1 until the Load = 100%
18. Remove the weight from the basket.
19. Seal the potentiometers with fingernail polish.