JLG 4017RS Service Manual - Manual (Page 46)

Boom
3-6 3614RS, 4017RS
Note: Before removing the extend chains, measure the
distance between the face of the jam nut to the end of the chain
clevis. This measurement will be used when reassembling the
boom.
10. Disconnect both tilt hoses and (if equipped) both
auxiliary hoses (5) 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 out from the rear of
the boom.
11. Loosen and remove the lock nut and jam nut (6) on the
retract chain at the front of the first boom section.
12. Loosen and remove the lock nut and jam nut (7) on the
extend chain at the front of the first boom section.
13. Remove the circlip and pin (8) from the retract chain (9)
at the rear of the third boom section. Lay the retract
chain over the rear edge of the first boom section.
14. Pull the second and third boom sections out of the first
boom section approximately 304mm (12 in) to access
the front first section wear pads.
15. Remove all wear pads, shims and backing plates from
the front inside of the first boom section(10). Label and
tag each set of wear pads being removed.
16. Pull the second and third boom sections out of the first
boom section. Relocate the lifting slings and slowly pull
the two boom sections clear of the first boom section.
Lower onto suitable supports.
17. Inspect the first boom and welds. Consult your local
authorized service distributor if structural damage is
detected.
18. Inspect hoses, hardware, wear pads, mounting points,
chains and other components visible with the first
boom section. Replace any item if damaged. (Refer to
Section 3.15, “Boom Extend and Retract Chains - 3614RS
& 4017RS,” and Section 3.16.1, “Wear Pad Inspection.”)
Note: It is recommended that if any chain or hose is damaged
that ALL chains or hoses are replaced.
Note: After removing the second and third boom section the
retract chain is left laying on the inside of the first boom section
and can be removed, cleaned, inspected and replaced if
required.
MZ7080
6
7
5
5
M 7120 Z
9
8
MZ7130
10