JLG 10MSP Service Manual - Manual (Page 89)

SECTION 5 - MAST COMPONENTS
3121228 – JLG Lift – 5-7
3. Disconnect and cap the hydraulic extend and return
lines from the hydraulic cylinder either on the valve
block at the bottom of the cylinder or at the pump
assembly. (See Section 5.6 for special tool instruc-
tions).
4. Using an overhead crane or suitable lifting device
capable of supporting the weight of the mast assem-
bly, attach a sling strap to the mast.
5. Remove the four (4) mast attach bolts with washers
and nuts securing the mast to the mounting column.
NOTE: When lifting the mast out of the base frame be care-
ful with the manual descent valve, extend and return
lines protruding from the bottom front of the mast
assembly.
6. Carefully lift the mast off the base frame and place
on a suitable work surface.
Mast Installation
To install the mast assembly reverse the Mast Removal
instructions, however perform the following additional
steps during re-assembly.
1. Once assembly is complete cycle the mast up and
down several times, then check the oil level in the
hydraulic reservoir.
5.8 MAST DISASSEMBLY PROCEDURE
The mast sections are constructed of extruded aluminum,
protected with an anodized surface finish. The mast sec-
tions are interlocked into each other when assembled, by
internally mounted slide pads at the top and bottom of
each mast section. These slide pads run up and down in
slide pad channels on each side of the mast.
The mast assembly contains the number of mast sections
as shown following;
Mast Disassembly Procedure
1. After the mast assembly has been removed from the
machine, lay the mast assembly down on a suitable
work table with the platform mounting section on
top, facing up.
2. Remove the sequencing cables, platform junction
box and hardware from the sides of the mast assem-
bly. Also remove the extend and return hydraulic
lines from the bottom of the lift cylinder.
NOTE: If equipped with the OPTIONAL 7 ft. height limiting
proximity switch, if necessary, remove the fasteners
attaching the bracket and switch to the left side of the
mast assembly. (See Section 5.5, Platform - 7 FT.
HEIGHT Limit Switch - OPTION).
Mast Section-4 - Removal (Platform Mount)
1. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate (lower) on
BOTTOM end of mast section-4 (platform mounting
section). Push threaded ends of chain through
anchor plate.
2. At the TOP of mast section-3, pull chains out and
allow to hang loose. (Be certain floor surface is
clean and free of any metal chips or debris which
may stick to lubricated chains)
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized surface in the slide
pad channels.
3. Carefully slide mast section-4 out the BOTTOM of
mast section-3 rails. Disassemble slide pads, shims
and chain anchor plate from mast section-4, if nec-
essary.
Table 5-1. Mast Component Features
Model
No. of Mast
Sections
Extend/Retract
Device
10MSP 4 Chain