Lull 944E-42 Service Manual Bedienungsanleitung PDF herunterladen (Seite 51)

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944E-42

Boom

5. At the front underside of the boom, record the

amount of threads extending beyond the locknut.

This measurement will be the starting point for

adjustment of the boom retract chain.

6. Remove the locknut (9) and washer securing the

retract chain to the boom.

7. Attach a wire or string to the threaded clevis with a

threaded eye (10) or a flat washer tack welded to a

capscrew. The outside diameter of the eye or flat

washer must be smaller than the diameter of the

threads on the clevis. The wire or string will be used

to pull the chain back through the boom during

reassembly.

8. Disconnect the retract chain yoke (11) from the rear

of the third boom section. Lay the chain assembly

flat behind the boom.

9. From the rear of the boom, pull the retract chain out

of the boom. Remove the wire from the clevis, but

not from the inside of the boom.

10. Inspect wear and condition of the booms, chains,

clevis’, chain sheaves, extend/retract cylinder, chain

rods, clevis anchors and all mounting hardware.

Replace a worn or damaged chain. DO NOT attempt

to make any repairs to the chain.

Note: Chains and clevis’ are wear items and experience

the same stress. DO NOT attempt to repair a chain.

Replace a stretched or damaged chain with a new part.

11. Attach the wire to the new retract chain.

12. From the rear of the boom, push the threaded clevis

end of the retract chain under the chain sheave and

down between the second and first boom sections.

Have an assistant pull the string or wire from the

front of the boom.

13. Guide the clevis through the hole in the tab at the

front of the boom.

14. Install the retract chain yoke on the rear of the third

boom section.

15. Remove the string or wire from the end of the clevis.

16. Secure the clevis with a locknut and washer. Tighten

the locknut on the retract chain clevis until the

amount of threads protruding beyond the locknut is

the same as the measurement recorded during

removal of the retract chain.

17. Check and adjust retract chain tension. Refer to

Section 3.4.5, “Boom Chain Tension Check.”

18. Install the boom rear cover.

19. Properly connect the battery.

MU1411

MU3901

MU1211

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