JLG 15SP Service Manual - Manual (Page 35)

SECTION 2 - SERVICE PROCEDURES
3120775 – JLG Lift – 2-21
2.8 MAST ASSEMBLY AND DISASSEMBLY
PROCEDURES
The SP Series personnel lift mast sections are contructed
of extruded aluminum, protected with an anodized surface
finish. 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 SP model mast assemblies have been
designed with four (4) and five (5) mast sections;
When assembing mast sections 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 section first,
then slide this section out the top of previous section and
assemble hardware to the top of mast, (See Figure 2-2.).
Always install slide pad shims with slide pads inserted into
the slide pad channels, (ends of mast sections even).
NOTE: The following procedures are used for both the four
(4) and five (5) section masts. When referring to the
mast sections in these procedures a split mast sec-
tion number like 4/5 will refer to either section-4 or
section-5 depending on which applies to your mast
assembly. See Figure 2-3. & Figure 2-4.
Mast Disassembly Procedure
(See Figure 2-2.)
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-4/5 on TOP and fac-
ing up.
2. Remove the sequencing retract cables from sides of
mast assembly, the chain guard, and the mini covers
from the top of each mast section.
Platform Section Removal
3. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate on BOT-
TOM end of mast section-4/5 (short, platform mount-
ing section). Push threaded ends of chain through
anchor plate
4. At TOP of mast section-4/5, pull chains out and
allow to hang loose.
Table 2-4. AM Series Mast Component Features
Model
No. of Mast
Sections
Extend Device
12SP 4 Chain
15SP 5 Chain
Figure 2-2. Mast Section - Assembly/Disassembly Reference.
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)
CLOSED RAIL
(REFERS TO CLOSED RAIL
BACK OF MAST SECTION)
OPEN RAIL
(REFERS TO OPEN RAIL
FRONT OF MAST SECTION)