Service Manual Instruction Manual

SECTION 4 - BOOM & PLATFORM
4-10 – JLG Lift – 3121171
4.16 ELECTRONIC PLATFORM LEVELING
The Electronic Platform Leveling System uses two tilt sensors
(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 control 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 sys-
tem controls the platform angle relative to gravity using a set
point established during 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 opera-
tor can chose a platform incline other than level with gravity
and the system will maintain that incline automatically.
If a fault occurs in the platform leveling system the following
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 adjust-
ment and operation, refer to Section 6 - JLG Control Sys-
tem.
4.17 MAIN BOOM
Disassembly
NOTE: The following procedure allows the boom base section 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 sec-
tion.
6. Remove the jib/platform assembly from the boom.
7. Extend the fly section enough to attach an adequate lift-
ing device for removing the fly section.