JLG 9MP Service Manual - Manual (Page 55)

SECTION 5 - MAST COMPONENTS
3121163 – JLG Lift – 5-11
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 cable and hardware, if nec-
essary, from the side of the mast assembly. Also
remove the cover from the top of the mast assembly.
And the chain guard from the top of mast section 3.
MAST SECTION-3 - REMOVAL
3. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate (lower) on
BOTTOM end of mast section-3 (platform mounting
section). Push threaded ends of chain through
anchor plate.
4. At the TOP of mast section-3, pull chains out and
allow to hang for later removal. (Be certain floor sur-
face 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.
5. Carefully slide mast section-3 out the BOTTOM of
mast section-2 rails. Disassemble slide pads, shims
and chain anchor plate from mast section-3, if nec-
essary.
MAST SECTION-2 - REMOVAL
6. Slide mast section-2 out TOP of mast section-1 far
enough to allow access to the cylinder anchor
block/sheave wheel assembly.
7. Remove the setscrew holding the hydraulic cylinder
rod onto the cylinder anchor block.
8. Remove countersunk-flathead screws securing cyl-
inder anchor block/sheave wheel assembly attach
bars on both side rail channels at TOP of mast sec-
tion-2.
9. Slide the cylinder anchor block/sheave wheel
assembly out the TOP of mast section-2 and lay
aside for further disassembly.
10. At the BOTTOM of mast section-1, remove the
mounting bolts/washers and support plates secur-
ing the lift cylinder, then carefully slide the cylinder
assembly out of mast section-2 being careful not to
nick or score cylinder rod surface while removing.
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
11. Carefully slide mast section-2 out BOTTOM of sec-
tion-1. Remove slide pads and shims, if necessary.
MAST SECTION-1 - DISASSEMBLY
12. If equipped, remove the floor brake alarm switch
assembly from the top of mast section-1.
13. Slide the TOP of mast section-1 out over edge of
work surface and remove the pin attaching the chain
equalizer-anchor block to mast section-1. Remove
chain set and anchor block assemblies from mast
and lay aside.
14. Remove slide pads and shims from mast section-1.
Mast disassembly should now be complete.