SECTION 4 - BOOM & PLATFORM
3121623
– JLG Lift –
4-9
Assembly
NOTE:
When installing fly section wear pads, install same
number and thickness of shims as were removed
during disassembly.
1.
Measure inside dimensions of the base and mid
sections to determine the number of shims
required for proper lift.
2.
Measure inside dimensions of the mid section to
determine the number of shims required for
proper lift.
3.
Install side, top and bottom wear pads to the
rear end of fly section; shim evenly to the mea-
surements of the inside of mid section.
4.
Install retract wire ropes into rear end of fly sec-
tion, route wire ropes thru holes in side of fly
boom section and pull into slot.
Figure 4-15.
5.
Install side, top and bottom wear pads to the
rear end of mid section.
NOTICE
WHEN ASSEMBLING BOOM SECTIONS, ENSURE THAT THE BOOM SLID-
ING TRAJECTORIES HAVE BEEN CLEARED OF CHAINS, TOOLS, AND
OTHER OBSTRUCTIONS.
6.
Slid fly boom section into the mid boom section.
Adjust boom, if necessary, for a total of 1/16 inch
(0.062) clearance.
7.
Install wear pads into the forward position of the
mid boom section. Adjust boom, if necessary, for
a total of 2/10 inch (5.08mm) clearance.
8.
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.
9.
Install sheave guards to rear end of mid boom
section and secure with mounting hardware.
10.
Slide mid boom section into the base boom sec-
tion. Allow the retraction wire ropes to trail
between the bottom surfaces of boom sections.
Adjust boom, if necessary, for a total of 1/16 inch
(0.062) clearance.
11.
Install wear pads into the forward position of the
base boom section. Adjust boom, if necessary,
for a total of 2/10 inch (0.20) clearance.
12.
Install sheave block to bottom of base boom sec-
tion and adjust block so that retract wire ropes
do not come into contact with boom surfaces.
13.
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.
14.
Pull the boom sections out to approximately
where they were extended to for telescope cylin-
der removal.
15.
Install a new extend sheave on the end of the
telescope cylinder.
16.
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.
17.
Use tape or tie straps to fasten the cables to the
telescope 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.
NOTICE
WHEN PUSHING 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 THE BOOM.
DAMAGE TO COMPONENTS MAY RESULT FROM FORCIBLE IMPACT
WITH THESE ASSEMBLIES.
NOTE:
The telescope cylinder weighs approximately 600
lbs. (275 kg).
18.
Using adequate lifting equipment, carefully
push the telescope cylinder assembly and cables
back into the boom.
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