Service Manual Instruction Manual

SECTION 6 - JLG CONTROL SYSTEM
3121171 – JLG Lift – 6-59
decreasing movement of more than 0.2 deg, Tower Lift
angle for decreasing movement of more than 0.2 deg
and Tower Telescope length decreasing movement of
more than 0.5" (1.27 cm) for 60 seconds. If one of these
conditions occur the test will abort and display on the
top line “CHECK FAILED:” and “MAIN LIFT APU”, “TOWER
LIFT APU” or “TOWER TELE APU” on the bottom line
depending on which section moved.
4. If the “CHECKING BOOM…” test passes then Tower Lift
Up will be enabled and the analyzer will read:
The Control System will disable all functions except auto
platform level and tower lift up.
5. After the pressing the ENTER key , the analyzer will
display “CALIBRATING…”on the bottom line and Control
System will record left tower angle 4, right tower angle
4, and high cylinder angle. The Control system estab-
lishes the high tower angle calibration point per sensor
by taking the difference between the angle 4 and the
ground slope in the direction of the boom. High Tower
Angle Calibration value = 80.0 (77.0 on old cylinder
stroke towers) +/- Ground Slope. The high cylinder angle
will be set to 81.7. The cylinder angle reading must be
within the proper range or “CAL FAILED” and “CYL ANGL
FAULT” will be displayed.
Step 5 - Position 5
1. After completing the previous step, the analyzer will
read:
The Control System will disable all functions except auto
platform level and tower tele out. The Control System
will energize tower lift up with the tower tele out com-
mand. The analyzer will display “CAL FAILED” and “TWR
NOT UP” if movement of the cylinder angle sensor is
detected. The Control System will monitor and record
the tower length sensor reading at which the tower
transport length switch changes state. The analyzer will
display “CAL FAILED” and “TWR LEN FAULT” if the switch
does not change state by 4”+/-3”.