Lull 944E-42 Service Manual - Manual (Page 34)

Boom
3-4 944E-42
5. Loosen the extend chain locknut (2) at the rear of the
boom halfway. The locknut must remain fully
engaged on the threads of the extend chain clevis.
6. In the cab, start the engine and retract the boom
slightly until slack is noticed in the extend chain.
Shut the engine OFF.
7. Move the attachment tilt joystick in both directions to
relieve any trapped pressure in the system. Move the
auxiliary hydraulic joystick in both directions to
relieve any trapped pressure in the system.
8. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
9. Open the engine cover. Allow the system fluids to
cool.
10. Properly disconnect the batteries.
11. Remove the clevis pin (3) to disconnect the extend
chain yoke from the first boom section. Lay the chain
assembly flat against the third boom section.
12. Label, disconnect and cap the hydraulic hoses (4)
attached to the Extend/Retract cylinder. Plug all
fittings to keep dirt & debris from entering the
hydraulic system.
13. Remove the one locknut, key plate, shim(s), flat
washer and capscrew on the left and right side of the
Extend/Retract cylinder rod trunnion mount (5).
Label all parts for installation.
14. Remove the capscrews and washers securing the
cylinder tube trunnion clamps to the second boom
section.
15. Remove the tie wraps from the two hose guards (6)
and remove the hose guards from the cylinder
hoses.
MU0211
3
MU6061
5
6