JLG 1250AJP Service Manual - Manual (Page 250)

SECTION 4 - BOOM & PLATFORM
4-10 – JLG Lift – 3121171
4.16 ELECTRONIC PLATFORM LEVELING
The Electronic Platform Leveling System uses two tilt sen-
sors (mounted on either side of the pivot weldment), a
control valve (mounted to the platform support), a level
cylinder, and the platform control module (mounted in the
platform control box) to automatically measure and con-
trol the incline of the platform with respect to gravity. This
system is active while operating drive, telescope, lift or
swing. It is not active while operating any other function
(e.g. rotate, jib, or steer). The system controls the platform
angle relative to gravity using a set point established dur-
ing power-up (cycling of the EMS) or at the conclusion of
a manual platform level override by the operator using the
platform level override switch from either the platform or
the ground control. In other words the operator can chose
a platform incline other than level with gravity and the sys-
tem will maintain that incline automatically.
If a fault occurs in the platform leveling system the follow-
ing will occur:
• Automatic platform leveling will stop (except when
there is a fault in only one sensor)
• The platform level fault indicator will flash
• The platform alarm will sound
• All functions will default to creep speed if in platform
mode and the boom is out of the transport position
(see Section 4.2, Transport Position Sensing System)
To reset a platform leveling fault, the emergency stop
switch should be recycled.
NOTE: For more detailed information concerning system
adjustment and operation, refer to Section 6 - JLG
Control System.
4.17 MAIN BOOM
Disassembly
NOTE: The following procedure allows the boom base sec-
tion to remain attached to the machine.
1. Make sure the machine is on a firm, level surface.
NOTE: The jib and platform assembly weighs approximately
1000 lbs. (454 kg).
2. Support the jib and platform assembly.
3. Tag and disconnect all electrical lines running to the
jib and platform.
4. Tag and disconnect all hydraulic lines running to the
jib and platform.
5. Remove the bolts, keeper pins, and pivot pins that
secure the jib rotator support to the nose of the fly
section.
6. Remove the jib/platform assembly from the boom.
7. Extend the fly section enough to attach an adequate
lifting device for removing the fly section.