JLG 1250AJP Service Manual - Manual (Page 495)

SECTION 6 - JLG CONTROL SYSTEM
3121171 – JLG Lift – 6-63
2. After pressing the ENTER key , the Control
System will verify the measured angle of the tower
cylinder matches the target angle of 74.6 +/-0.5
(relative to the turntable), otherwise, the analyzer will
display “CAL FAILED” on the top line and “TWR UP
TO STOP” or “TOWER DWN TO STOP” on the bot-
tom line each time the ENTER key is pressed and
the measured angle does not match the expected
angle. If the target is reached, the analyzer will dis-
play “CAL POSITION 8” on the top line and “CALI-
BRATING…”on the bottom line and calculate the
load pin cal resultant force 8, load pin cal force vec-
tor angle (ref t/t base plate), and the calculated cylin-
der angle at load pin cal point. The Control System
will calculate the required rotation correction angle
of the load pin cal force vector angle to match the
cylinder angle at the load pin cal point. The control
system will modify the load pin x and y values into x’
and y’ values for use in determining moments by
rotating the forces by the rotation correction angle
and redistributing the forces onto the new axis. The
control system shall calculate the corrected load pin
cal moment 8. The Control System will also verify
the calculated rotational correction angle is +/- 10
degrees. If it falls outside of this tolerance, the Con-
trol System will fail calibration and the analyzer will
display “PIN ANGLE FAULT”.
Step 9 - Position 9
1. After completing the previous step, the analyzer will
read:
The Control System will disallow all functions except
auto platform level and swing.
Swing turntable 180° - The turntable must be cen-
tered over the original end of chassis