JLG 600A Operation And Safety Manual page 34

SECTION 2 - USER RESPONSIBILITIES, MACHINE PREPARATION, AND INSPECTION
QUALIFIED JLG TECHNICIAN.
TO AVOID UPSET IF TOWER BOOM SWITCHING MALFUNCTIONS:
— LOWER THE PLATFORM TO GROUND VIA MAIN BOOM LIFT AND
TELESCOPE FUNCTIONS.
— HAVE CONDITION CORRECTED BY A CERTIFIED JLG SERVICE TECH-
NICIAN BEFORE CONTINUING USE OF MACHINE.
TO AVOID COLLISION AND INJURY IF PLATFORM DOES NOT STOP
WHEN A CONTROL SWITCH OR LEVER IS RELEASED, REMOVE FOOT
FROM FOOTSWITCH OR USE EMERGENCY STOP TO STOP THE
MACHINE.
1. Check hydraulic boom sequence cam valves. Raise,
extend, retract and lower tower boom. Check for smooth
and proper operation.
NOTE: Perform checks from ground controls first, then from plat-
form controls.
2. Operate machine from ground control.
3. Move TOWER TELESCOPE to 'out' position. Tower
should not telescope with TOWER BOOM less than fully
2-12
elevated 'up'. (Must be approximately 13 degrees from
vertical to move TOWER TELESCOPE 'out'.)
4. Move TOWER BOOM to 'up' position and hold until the
TOWER BOOM is completely elevated. Move TOWER
TELESCOPE to 'out' position and hold until the TOWER
BOOM is fully extended.
5. With TOWER BOOM completely extended, place
TOWER LIFT in 'down' position. Tower boom should not
LIFT 'down' unless the TOWER BOOM is fully retracted.
6. Place TOWER TELESCOPE to 'in' position and fully
retract the TOWER BOOM. Place TOWER BOOM to
'down' and fully lower the TOWER BOOM. Upright in
vertical position. If Tower Boom does not rest on stop
with machine in the stowed position, this indicates
upright is out of plumb. See Section 4, Boom Synchro-
nizing Procedure, in Service Manual.
TO AVOID TIPPING OVER DO NOT USE MACHINE IF TOWER BOOM
SWITCHING IS OUT OF SEQUENCE.
NOTE: For adjustments see Service Manual - Limit Switch Adjust-
ments.
– JLG Lift – 3121204