JLG 740AJ Service Manual - Manual (Page 235)

SECTION 4 - BOOM & PLATFORM
3121160 – JLG Lift – 4-19
Assembly
1. Align lift cylinder with attach holes in articulating jib
boom. Using a soft head mallet, install cylinder pin
#7 into articulating jib boom and secure with mount-
ing hardware.
2. Align rotator support with attach hole in articulating
jib boom. Using a soft head mallet, install rotator
support pin #6 into articulating jib boom and secure
with mounting hardware.
3. Align bottom tubes with attach holes in rotator sup-
port. Using a soft head mallet, install rotator support
pin #5 into articulating jib boom and secure with
mounting hardware.
4. Align articulating jib boom with attach hole in articu-
lating jib boom pivot weldment. Using a soft head
mallet, install rotator support pin #4 into articulating
jib boom and secure with mounting hardware.
5. Align bottom tubes with attach holes in articulating
jib boom pivot weldment. Using a soft head mallet,
install rotator support pin #3 into articulating jib
boom pivot weldment and secure with mounting
hardware.
6. Align articulating jib boom pivot weldment with
attach holes in fly boom assembly. Using a soft head
mallet, install pivot pin #2 into fly boom assembly
and secure with mounting hardware.
7. Align the slave leveling cylinder with attach holes in
articulating jib boom pivot weldment. Using a soft
head mallet, install slave leveling cylinder pin #1
into articulating jib boom pivot weldment and secure
with mounting hardware.
4.9 LIMIT SWITCHES ADJUSTMENT
Main Boom Horizontal Limit Switch
1. Place machine on level surface.
2. Raise main boom to 10 degrees above horizontal.
limit switch should activate before this point.
3. Lower main boom until limit switch resets. this
should be 1 degree above to 4 degrees below hori-
zontal. (See Figure 4-7. for adjustments)
NOTE: Angle indicator should be placed approx. 2 ft. from
the main boom pivot pin and the attach point on the
main boom. Tower angle switch must be reset before
main boom angle switch can be activated.
Tower Boom Horizontal Limit Switch
1. Place machine on level surface.
2. Raise Tower Boom to 13 degrees above horizontal.
The tower angle limit switch should activate at this
point.
3. Lower the tower boom until the limit switch resets.
This should be 2 to 7 degrees below where the
switch was activated.