JLG 4017PS Service Manual - Manual (Page 51)

3-13 3706PS, 3707PS, 4014PS, 4017PS, 33.7, 37.6, 37.7
Boom
7. Disconnect both extend/retract hoses (3) at the
bottom of the first boom section. Plug the hose ends
and cap the tube ends to prevent dirt and debris
from entering the hydraulic system. Pull the
disconnected hoses from the rear of the boom.
8. Remove the locknuts and jam nuts (4) from the
extend chains (5) at the top of the first boom section.
9. Pull both extend chains (5) back to allow the removal
of two circlips (6), two spacers (7) and clevis bracket
(8).
10. Loosen and remove the hose stop bracket (9) from
the rear of the second boom section.
11. Pull the disconnected extend chains (10) from the
rear of the boom.
12. Remove both top and one side wear pads, shims
and backing plates from the rear inside of the
second boom section. Label each set of wear pads
being removed
13. 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.
14. 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 chains. Lower
the second and third boom sections onto suitable
supports.
3.6.3 Third Boom Section and Extend/
Retract Cylinder Removal
1. Remove all wear pads, shims from the front inside of
the second boom section. Label each set of wear
pads being removed.
2. Loosen and remove the retract chain sheave
components (11) from the front of the second boom
section.
3. Pull the retract chain (12) free of the sheave
brackets and lay it on the third boom section.
MAM0721
5
4
7
8
6
MAM0710
3
3
MAM0880
9
10
MAM0740
11
12