JLG 1250AJP Service Manual - Manual (Page 501)

SECTION 6 - JLG CONTROL SYSTEM
3121171 – JLG Lift – 6-69
6. Once “CHECKING BOOM…” is started, the control
system will wait 2 seconds and then capture the
position of the Main Boom to Tower, Tower Cylinder
Angle and Tower Length. The control system then
will command the Main Lift, Tower Lift and Tower
Telescope PVG valves to 40%, engage the Main
Control and PVG enable valves and command the
Engine to 1800 RPM for 20 seconds. The control
system will monitor for the Main Lift and Tower Lift
angles increasing by more then 0.2 deg and the
Tower Telescope length increasing by more then
0.5”. If one of these conditions occur the test will
abort and display on the top line “CHECK FAILED:”
and “MN LIFT ENABLE”, “TWR LIFT ENABLE” or
“TWR TELE ENABLE” on the bottom line depending
on which section moved.
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