JLG 680S, Руководство по обслуживанию и ремонту, Страница: 293 / 530

SECTION 4 - BOOM & PLATFORM
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4. Install retract wire ropes into rear end of fly section,
route wire ropes through holes in side of fly boom sec-
tion and pull into slot.
5. Install side, top and bottom wear pads to the rear end of
mid section; shim evenly to the measurements of the
inside of mid section.
WHEN ASSEMBLING BOOM SECTIONS, ENSURE THAT THE BOOM SLIDING TRA-
JECTORIES HAVE BEEN CLEARED OF CHAINS, TOOLS, AND OTHER OBSTRUC-
TIONS.
6. Shim the insides of the boom sections for a total of
1/16 in. (1.6 mm) clearance (if the action is centered,
there will be 1/32 clearance on each side).
7. Slide fly boom section into the mid boom section. Shim
boom, if necessary, for a total of 1/16 in. (1.6 mm) clear-
ance.
8. Install wear pads into the forward position of the mid
boom section. Shim boom, if necessary, for a total of
2/10 in. (5 mm) clearance.
9. Properly position the retraction wire rope sheaves
assemblies at the rear 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 rear 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 bot-
tom surfaces of boom sections. Shim boom, if necessary,
for a total of 1/16 in. (1.6 mm) clearance.
12. Install wear pads into the forward position of the base
boom section. Shim boom, if necessary, for a total of
2/10 in. (5 mm) 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 through attachment
holes in the bottom of base boom section. Loosely
install nuts and jam nuts onto the threaded ends of wire
ropes.
15. Pull the boom sections out to approximately where they
were extended to for telescope cylinder removal.
16. Install a new extend sheave on the end of the telescope
cylinder.
17. Route new extend cables around the telescope cylinder.
Loosely fasten the threaded end of the cables to the rod
end of the telescope cylinder with the adjusting nuts
and lock nuts. Install the opposite end of the cables in
the cable mount block.
18. Use tape or tie straps to fasten the cables to the tele-
scope cylinder assembly. It is important that the tape or
straps be strong enough to hold the cable in place yet
weak enough to break and fall away when the cables are
adjusted.
WHEN PUSHING THE TELESCOPE CYLINDER INTO THE BOOM, IT MAY BE NEC-
ESSARY 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 THE BOOM. DAMAGE TO COMPONENTS
MAY RESULT FROM FORCIBLE IMPACT WITH THESE ASSEMBLIES.
Figure 4-15. Routing Installation of Retract Wire Ropes