Service Manual Instruction Manual

SECTION 6 - JLG CONTROL SYSTEM

6-70 – JLG Lift – 3121171

7. After the 20 seconds has elapsed the control system will

command the engine back to idle, shut off the com-

mands to the PVG valves, disengage the Main Control

and PVG enable valves and turn on the Main Lift, Tower

Lift and Tower Telescope Enable valves and monitor the

Main Lift and Tower Lift angles for decreasing move-

ment of more then 0.2 deg and Tower Telescope length

decreasing movement of more then 0.5” for 60 seconds.

If one of these conditions occur the test will abort and

display on the top line “CHECK FAILED:” and “MAIN LIFT

HOLD”, “TOWER LIFT HOLD” or “TOWER TELE HOLD” on

the bottom line depending on which section moved.