JLG 10MSP Service Manual - Manual (Page 90)

SECTION 5 - MAST COMPONENTS
5-8 – JLG Lift – 3121228
Mast Section-3 - Removal
1. Remove chain adjust nuts from threaded ends of
chains attached to the chain anchor plate (lower) on
BOTTOM end of mast section-3. Push threaded
ends of chains through anchor plate.
2. At TOP of mast section-2, 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 finish in the slide pad
channels.
3. Slide mast section-3 out the TOP of mast section-2
enough to allow removal of the sheave wheel
assembly.
4. Remove countersunk-flathead screws securing
chain sheave wheel assembly attach bars on both
side rails at TOP of mast section-3 and remove
sheave wheel assembly.
5. Carefully slide mast section-3 out the BOTTOM of
section-2. Remove slide pads, shims and cable
anchor plate, if necessary.
Mast Section-2 - Removal
NOTE: Since the lift cylinder rod is still attached to the
anchor block at the top of the section-2 mast assem-
bly, you will need to temporarily uncap the extend
and return hydraulic lines to allow mast section-2 to
be extended in the next step. Capture any hydraulic
fluid that may flow out of the lines and recap the lines
once section is extended.
1. Slide mast section-2 out TOP of mast section-1 far
enough to allow access to the chain assembly
anchor block/sheave wheel assembly.
2. On the underside of the mast assembly, remove the
snap ring securing the anchor pin running through
the small chain equalizer plate, the cylinder anchor
block and the cylinder rod.
3. Push or lightly tap the anchor pin up and remove.
Lay the small chain set aside.
4. Remove countersunk-flathead screws securing
chain anchor block/sheave wheel assembly attach
bars on both side rails at TOP of mast section-2 and
remove the anchor block/sheave wheel assembly.
NOTE: When sliding mast sections apart, be careful not to
scratch or score the anodized finish in the slide pad
channels.
5. Carefully slide mast section-2 out the TOP of sec-
tion-1. Remove slide pads and shims, if necessary.
Figure 5-2. Mast Cut-a-Way View
1. Lift Cylinder
2. Cylinder Lift Point
3. Wide Chain Set 4. Narrow Chain Set
5. Section-3 - Lift Chain Anchor Bracket
6. Section-4 - Lift Chain Anchor Bracket