JLG 660SJ Service Manual - Manual (Page 185)

SECTION 4 - BOOM & PLATFORM
3121202 – JLG Lift – 4-13
7. Slide fly boom section into the mid boom section.
Shim boom, if necessary, for a total of 1/16 inch
(0.062) clearance.
8. Install wear pads into the forward position of the mid
boom section. Shim boom, if necessary, for a total of
2/10 inch (0.20) clearance.
9. Properly position the retraction wire rope sheaves
assemblies at the aft end of the mid boom section;
ensure all sheave-to-mounting block attachment
holes align. Install the sheave pins and secure them
with mounting hardware. Position retract wire ropes
onto the sheaves.
10. Install sheave guards to aft end of mid boom section
and secure with mounting hardware.
11. Slide mid boom section into the base boom section.
Allow the retraction wire ropes to trail between the
bottom surfaces of boom sections. Shim boom, if
necessary, for a total of 1/16 inch (0.062) clearance.
12. Install wear pads into the forward position of the
base boom section. Shim boom, if necessary, for a
total of 2/10 inch (0.20) clearance.
13. Install sheave block to bottom of base boom section
and adjust block so that retract wire ropes do not
come into contact with boom surfaces.
14. Install wire rope threaded ends thru attachment
holes in the bottom of base boom section. Loosely
install nuts and jam nuts onto the threaded ends of
wire ropes.
15. Align the telescope cylinder barrel-to-sheave attach-
ment point. Install extend sheave pin through the
telescope cylinder barrel and sheave assembly;
secure pin with mounting hardware.
16. Route extend wire ropes around extend sheave and
secure wire ropes to the telescope cylinder.
17. Install extend wire rope mounting blocks to threaded
ends of wire ropes. Loosely install nuts and jam nuts
onto the threaded ends of wire ropes.
NOTE: When installing wire ropes, care must be taken not to
twist or cross the wire ropes.
NOTE: For non CE specification machines, skip step 18 and
proceed to step 19.
18. Install extend wire rope mounting blocks, proximity
mounting plate and spring to threaded ends of wire
ropes. Loosely install nuts and jam nuts onto the
threaded ends of wire ropes. Refer to Figure 4-16.,
Installing the Proximity Switch.
19. Secure the sling and lifting device at the telescope
cylinder’s approximate center of gravity, and lift the
cylinder to the aft end of the boom assembly.
WHEN INSERTING THE TELESCOPE CYLINDER INTO THE BOOM,
IT MAY BE NECESSARY AT SOME POINT TO TURN THE CYLINDER
SLIGHTLY IN ORDER TO CLEAR ASSEMBLIES MOUNTED WITHIN
THE BOOM. CARE MUST BE TAKEN TO MOVE THE CYLINDER
SLOWLY INTO POSITION. DAMAGE TO COMPONENTS MAY
RESULT FROM FORCIBLE IMPACT WITH THESE ASSEMBLIES.
Figure 4-16. Installing the Proximity Switch