JLG 600SC_660SJC Service Manual - Manual (Page 114)

SECTION 4 - BOOM & PLATFORM
4-12 – JLG Lift – 3121607
7. Slide fly boom section into mid boom section. Shim
boom, if necessary, for a total of 1/16 inch (0.062) clear-
ance.
8. Install wear pads in forward position of the mid boom
section. Shim boom, if necessary, for a total of 2/10 inch
(0.20) clearance.
9. Properly position retraction wire rope sheaves assem-
blies at aft end of mid boom section. Ensure all sheave-
to-mounting block attachment holes align. Install
sheave pins and secure them with mounting hardware.
Position retract wire ropes onto sheaves.
10. Install sheave guards to aft end of mid boom section
and secure with mounting hardware.
11. Slide mid boom section into base boom section. Allow
retraction wire ropes to trail between 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 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
bottom of base boom section. Loosely install nuts and
jam nuts on threaded ends of wire ropes.
15. Align telescope cylinder barrel-to-sheave attachment
point. Install extend sheave pin through telescope cylin-
der barrel and sheave assembly; secure pin with mount-
ing 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 on
threaded ends of wire ropes.
NOTE: Do not twist or cross wire ropes during installation.
NOTE: For non CE specification machines, skip step 18 and pro-
ceed 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 on threaded
ends of wire ropes. Refer to Figure 4-20., Proximity
Switch Installation.
19. Secure sling and lifting device at telescope cylinder’s
approximate center of gravity, and lift cylinder to aft end
of boom assembly.
WHEN INSERTING TELESCOPE CYLINDER IN BOOM, IT MAY BE NECESSARY TO
TURN CYLINDER SLIGHTLY TO CLEAR ASSEMBLIES MOUNTED IN BOOM. CARE
MUST BE TAKEN TO MOVE CYLINDER SLOWLY INTO POSITION. DAMAGE TO
COMPONENTS MAY RESULT FROM FORCIBLE IMPACT WITH ASSEMBLIES.
20. Align cylinder with slots at aft end of mid boom section,
then secure cylinder with mounting hardware.
21. Align holes in aft end of fly boom section with holes in
wire rope mounting block. Secure with mounting hard-
ware.
Figure 4-20. Proximity Switch Installation