JLG 4017RS Service Manual - Manual (Page 60)

Boom
3-20 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. Loosen and remove the lock nut and jam nut (5) on the
retract chain at the front of the first boom section.
11. Loosen and remove the lock nuts and jam nuts (6) on
the extend chains at the front of the first boom section.
12. At the rear of the boom, label, disconnect and cap both
Tilt hoses (8) and (if equipped) both Auxiliary hoses (9)
from the brackets attached to the third boom section.
Cap all fittings to prevent dirt and debris from entering
the hydraulic system.
13. Remove the clip and pin (10) from the retract chain
clevis that is attached to the rear of the third section
boom. Lay the retract chain (11) over the rear of the first
boom section.
14. Pull the second, third and fourth section booms out 152
mm to 203 mm (6 in to 8 in) and remove all the wear
pads, shims and backing plates from the front inside of
the first section boom (12). Label all parts for
installation.
15. Using a sling around the front of the second boom
section, lift and slide the three boom sections 75% of
the way out of the first boom section. Set the boom
head down on a suitable support, then center the sling
to be able to balance the three boom sections being
removed. Carefully pull the three boom sections the
remainder of the way out of the first boom section and
set the three boom sections down on suitable supports.
16. Remove the retract chain from the inside of the first
boom section. Clean and inspect chains. Replace if
damaged.
17. Label, disconnect and cap the Tilt and (if equipped)
Auxiliary hydraulic hoses from tubes at bottom front of
first boom section. Plug all fittings to prevent dirt and
debris from entering hydraulic system. Clean and
inspect the hoses. Replace if damaged.
18. Inspect the boom and welds. Consult your local
authorized service distributor if structural damage is
detected.
19. 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.
M 7280 Z
6
5
7
MZ7290
10
9
8
11
M 7300 Z
12