JLG 25AM, Service And Maintenance Manual

Page: 48 / 93

SECTION 2 - SERVICE PROCEDURES
2-20 31215808
2.9 MAST DISASSEMBLY PROCEDURE
The AM Series personnel lift mast sections are constructed of
extruded aluminum, protected with an anodized surface fin-
ish. The mast sections rails are interlocked into each other
when assembled and are guided by slide pads mounted at the
top and bottom of the rails on both sides of the mast section.
The current AM model line mast assemblies have been
designed with either six (6) or seven (7) mast sections as
shown following;
Assembly procedures for all mast assemblies is basically the
same, carefully slide the mast sections together from bottom
until mast ends are even, (
when sliding mast sections together
be careful not to scratch the anodized surface in the slide pad
channels) . Assemble the hardware to the bottom of mast sec-
tion first, then slide this section out the top of previous section
and assemble hardware to the top of mast,
(See Figure 2-3.).
Always install slide pad shims with slide pads inserted into the
slide pad channels, (ends of mast sections even). Shim slide
pads so that all side to side section movement is eliminated,
but section can still slide in mast by hand.
Mast Disassembly Procedure
(See Figure 2-3.)
NOTE: Reference to mast sections -6/-7 made following is depen-
dent on which model machine you are servicing since the
25 ft. machines use six (6) mast sections, the 30 and 38 ft.
models use seven (7) mast sections.
1. After the platform and other hardware have been
removed from the mast, and mast has been removed
from machine, lay mast assembly down with the shortest
mast section -6/-7 on top and facing up.
2. Remove sequencing retract cables from sides of mast
assembly and the mini covers from the top of each mast
section. Also, remove the latch bar assembly from BOT-
TOM of mast section -6/-7.
Table 2-4. AM Series Mast Component Features
Model
No. of Mast
Sections
Extend Device
25AM 6 Chain & Cable
30AM 7 Chain & Cable
38AM 7 Chain & Cable
Figure 2-3. Mast Section - Assembly/Disassembly Reference
OPEN RAIL
(REFERS TO OPEN RAIL
FRONT OF MAST
SECTION)
CLOSED RAIL
(REFERS TO CLOSED RAIL
BACK OF MAST SECTION)
TOP
(REFERS TO TOP END
OF MAST SECTION -
END WITH COVER
AND SHEAVE WHEELS
ATTACHED)
BOTTOM
(REFERS TO BOTTOM END
OF MAST SECTION -
END WHICH SETS AT
MACHINES BASE FRAME)
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