JLG 1500SJ Service Manual - Manual (Page 253)

SECTION 4 - BOOM & PLATFORM
3121262 – JLG Lift – 4-7
Attempts to lift the main boom while this override is on will
result in a JIB LEVELING SYSTEM FAULT because during
the override automatic jib leveling is disabled. To adjust
the jib back to level go into override mode for the jib level-
ing. Turn it on, escape out of the Service Modes menu,
and go to DIAGNOSTICS/BOOM SENSORS menu. Use
the RIGHT arrow key go until you get to the follow-
ing screen.
Adjust the jib level using the jib lift up and down function
switch until the jib level control angle reads zero. Cycle
power and operate the main boom to verify that jib level is
working.
Jib Lift Functionality
The ground module controls the jib control valve using an
output on the ground. Simultaneous main lift and jib lift
function is not possible. The first function activated will
have priority over the other. Manual override of the plat-
form leveling function will be allowed during all functions.
If there is a failure in which the jib functions cannot be
controlled from the Jib Control Module, the ground mod-
ule will control the jib control valve and also override the
jib lift up and down valve with outputs out of the ground
module.
Jib Telescope Functionality
Jib Telescope out will only be allowed if the axles are
extended, and the capacity control is in the 500# mode
and the jib is locked inline with the main boom, or if the
machine is in the stowed state.
Jib Swing Functionality
The jib swing function is only used to stow the jib for trans-
port, and taking the jib out of the stowed position for use.
This function is only permitted when the main boom is in
the transport state.
Jib Swing Stow Sequence (Jib Pin Unlock)
If the machine is in the transport mode and the operator
attempts jib swing right, the control system attempts to
unlock the jib lock pin. If successful, (determined by the
jib lock pin proximity sensor) the control system continues
to command the jib lock pin unlock output on and control
the jib swing right function until the operator releases the
jib swing function, or the jib reaches the jib stowed posi-
tion. Once the operator releases the jib swing function the
control system shall command the jib lock pin unlock out-
put to off. If the jib lock pin does not unlock, the control
system continues to try to unlock the jib pin when the
operator commands a jib swing right function. The control
system allows jib swing left to jog the jib in the instance
the pin is pinched by the jib structure.
Jib Lock Pin control can be manually overriden using the
analyzer. The control system only allows this under certain
conditions and it should only be performed by an autho-
rized JLG service technician. When accessed, the jib lock
pin can be manually extended or retracted. To use this
service mode the technician must be in platform and in
platform mode because the footswitch is required to acti-
vate the jib lock pin.