JLG 534D-10 - Manual (Page 33)

3.5 534D-9, 534D-10 & 544D
Boom
3.3.2 Second & Third 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 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 cables and push beam are
made much easier.
2. Remove all wear pads, shims and backing plates
from the front inside of the first boom section. Label
and tag each set of wear pads being removed.
3. Loosen the hose take-up brackets (1) on the bottom
front of the first boom section. Disconnect both tilt
hoses and both auxiliary hoses (2) inside the boom,
below the take-up brackets.Plug the hose ends and
cap the tube ends to prevent dirt and debris from
entering the hydraulic system.
Note: If the machine is equipped with auxiliary
hydraulics, separate the plug at the hose take-up area.
4. Loosen the lock-nut and jam-nut (3) on the retract
cable at the front of the first boom section. Loosen
and remove the bolts holding the retract cable
adjusting block.
5. Remove the lock-nuts and jam-nuts (4) from the
extend cables at the rear of the boom assembly.
6. Label, disconnect and cap the extend/retract hoses
(5) from the cylinder. Cap all fittings and openings to
prevent dirt and debris from entering the hydraulic
system.
7. Remove the extend/retract cylinder mounting pin,
hose guards and strong back from the rear of the
boom assembly.
8. Place a sling around the second boom section, lift
and slowly pull the second and third boom section
approximately half way out of the first boom section.
Lower the second and third boom sections onto a
suitable support.
9. Relocate the sling or using two slings for better
stability, balance the two boom sections and slowly
pull them out of the first boom section being careful
not to damage the hydraulic hoses or cables. Lower
the second and third boom sections onto suitable
supports.
3.3.3 Third Boom Section & Push Beam
Removal
1. Remove all wear pads, shims from the front inside of
the second boom section. Label and tag each set of
wear pads being removed
2. Label, disconnect and cap the tilt circuit hoses (6)
from the tilt cylinder at the front of the third boom
section. Label, disconnect and cap the auxiliary
circuit hoses from the quick disconnect fittings at the
front of the third boom section. Cap all fittings and
openings to prevent dirt and debris from entering the
hydraulic system.
MX0120
1
2 3
MX0130
4
5