JLG 800A_AJ ANSI Service Manual - Manual (Page 229)

SECTION 4 - BOOM & PLATFORM
3120740 – JLG Lift – 4-15
7. Inspect structural units of articulating jib boom
assembly for bending, cracking, separation of
welds, or other damage. Replace boom sections as
necessary.
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.
4.8 SEQUENCE FOR HOSE REPLACEMENT
IN THE TOWER BOOM
1. Remove the tower boom front cover (8) bolts, expos-
ing the power track.
2. Remove (2) bolts to disconnect the top bar of the
powertrack
3. Pull the powertrack out of base boom. (as far as
hoses will allow)
4. At left side rear of upright, remove access cover
plate (4) bolts. (others if necessary)
5. Remove access cover plate, (4) bolts, from bottom
front of fly boom.
6. Cut cable ties that attach hose to be replaced.
7. Disconnect hose that is to be replaced, and cap the
male fitting.
8. Attach the new hose to the end of the hose to be
replaced.
9. Pull these lines thru the upright and out the bottom,
then feed back into the fly boom.
10. At the powertrack, in front of the tower boom, open
the powertrack links to expose the hose to be
replaced.
11. Pull hose to be replaced, attached to the new hose,
thru the fly boom and thru the powertrack links.
12. Disconnect new hose from the replaced hose and
connect to fitting where the damaged hose was con-
nected.
13. Roll powertrack back into base, and attach the top
bar of the powertrack (2) bolts to the inside top of
the fly boom section.
14. Check for leaks and hardware tightened securely.
15. Replace access cover plates and front cover.
4.9 LIMIT SWITCHES ADJUSTMENT
Upper Boom Horizontal Limit Switch
1. Place machine on level surface.
2. Raise upper boom to 10 degrees above horizontal.
limit switch should activate before this point.
3. Lower upper boom until limit switch resets. This
should be 1 degree above to 4 degrees below hori-
zontal. (See Figure 4-12. for adjustments)
NOTE: Angle indicator should be placed approx. 2 ft. from
the upper boom pivot pin and the attach point on the
upper boom. Tower angle switch must be reset
before upper 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. (See Figure 4-9. and Figure 4-
10. for adjustments).