JLG 4013PS Service Manual - Manual (Page 42)

Boom
3-10 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
13. Lift the complete boom off machine and set on level
ground or supports being careful not to damage the
tubes on the left side of boom.
3.6.2 Second, Third and Fourth Boom
Section Removal
1. Set the complete boom on level ground and by
repositioning the slings turn boom over on to the top
side. Set the complete boom (1) on suitable stands
to begin tear down.
Note: With the complete boom setting upside down, the
removal and replacing of each boom section, tilt cylinder,
hoses, extend and retract chains and hose carrier are
made much easier.
2. At the boom head attach a sling through rod end of
tilt cylinder. Label, disconnect and cap both hoses
from Tilt cylinder. Plug the cap all fittings to prevent
dirt and debris from entering the hydraulic system.
Remove the clip from barrel end of tilt cylinder pin.
Remove the tilt cylinder pin and lift the Tilt cylinder
out of the boomhead.
3. Use a suitable sling around the third section boom to
take any pressure off of wear pads to make pad
removal easier.
Note: Before removing the extend chains, measure the
distance (2) between the face of the jam nut to the end of
the chain clevis on all four extend chains. This
measurement will be used when reassembling the
boom.
4. At the bottom front of the first boom section, remove
the jam nuts and nuts and washers from the two
extend chain clevises. Remove clips and pins from
the two clevises and remove clevis from each chain.
5. At the bottom front of the second boom section
remove the jam nuts and nuts and washers from the
two extend chain clevises. Remove clips and pins
from the two clevises and remove clevis from each
chain.
6. At the rear of the boom, label, disconnect and cap
both Tilt hoses and both Auxiliary hoses from the
bulkhead on the hose carrier. Cap all fittings to
prevent dirt and debris from entering the hydraulic
system.
7. Remove the clip and pin from both retract chain
clevises that are attached to the rear of the third
section boom. The pins can be removed through the
access holes at the bottom left and right sides of the
first section boom. Do not remove the clevises.
8. Remove the clip and pin from the retract chain clevis
that is attached to the rear of the fourth boom
section. Do not remove the clevis.
9. Pull the second section boom out 152 mm to
203 mm (6 in to 8 in) and remove all the wear pads
from the front inside of the first section boom. Label
all parts for installation.
10. Pull the third boom section out 152 mm to 203 mm
(6 in to 8 in). Remove the top left and right side wear
pads from the second boom section. Loosen the
bottom rear wear pad bolts and remove the shims
from the second boom section to gain the necessary
clearance to be able to remove the second boom
section from the first boom section. Label all parts
for installation.
MZ0740
1
MZ0790
2 2