Lull 944E-42, Service Manual

Page: 53 / 844

3.7 Model 644E-42/944E-42 Rev. 6/04
Boom
17. Label, disconnect and plug the attachment tilt
hoses (16) at the fittings at the front of the inner
boom section. Cap the fittings on the tilt cylinder to
prevent dirt and debris from entering the hydraulic
system.
18. Label, disconnect and plug the auxiliary hydraulic
hoses (17) at the fittings at the front of the inner
boom section. Cap the bulkhead fittings on the
gooseneck bracket.
Note: If you are replacing the inner boom with a new
inner boom: Remove the female coupler, male nipple
and bulkhead fittings from the bulkhead plate inside the
gooseneck. Also see; Section 3.6.5, “Attachment Tilt
Cylinder Removal,” for Attachment Tilt Cylinder removal.
Note: If the inner boom of your vehicle is equipped with
remote auxiliary hydraulic couplers, remove the
couplers, tubes and mounting plate from the gooseneck.
Transfer the remote couplers to the gooseneck of the
new inner boom.
19. Remove four capscrews holding the hose clamps
(18) to their boom mounts at the rear of the inner
boom.
20. Use a suitable overhead lifting device and sling,
attach to the Extend/Retract Cylinder trunnion (19).
Rotate and pull the Extend/Retract cylinder out of
the inner boom far enough to give the attachment
tilt (21) and auxiliary hydraulic (20) hoses enough
room to be pulled out of the boom.
21. Remove the attachment tilt (21) and auxiliary
hydraulic (20) hoses from the inner boom by pulling
them out from the top of the inner boom. Lay the
hoses behind the vehicle.
22. Completely remove the Extend/Retract cylinder (19).
Readjust the position of the sling as needed to help
balance the cylinder during withdrawal. When the
cylinder is clear of the vehicle, carefully lower it to
the ground.
23. Remove two retaining rings (22) and clevis pin (23)
to disconnect the retract chain yoke (24) from the
rear of the inner boom (25). Lay the chain assembly
flat behind the inner boom.
MU0270
16
17
MU0240
18
21
19
20
MU1210
22
22
23
24
25