JLG 9MP Service Manual - Manual (Page 53)

SECTION 5 - MAST COMPONENTS
3121163 – JLG Lift – 5-9
5.4 MAST ASSEMBLY - REMOVE/INSTALL
NOTE: The mast may be completely disassembled while on
the machine except for section-1 mast extrusion
which is bolted to the machine. Follow steps 1 to 3
on cylinder removal for laying machine on it’s back
as shown in Section 5.3, Hydraulic Lift Cylinder -
Removal, Inspection and Rebuild. Then perform the
mast disassembly/assembly instructions in Section
5.5.
Mast Removal
1. The following components must be removed from
the machine before removing the mast assembly:
• Rear Battery/Charger Cover
• Battery Charger
• Complete Ground Control Station with Mount and
Hydraulic lines
• Platform Assembly
2. Disconnect the positive battery cable from the bat-
tery.
3. Unplug the platform control cable connector at the
ground control module.
4. Remove the clamp attaching the platform control
cable from inside the mast mounting column.
5. Disconnect the spring and clamp attaching the plat-
form controls cable on the right side of the mast.
6. Under the machine, disconnect and cap the hydrau-
lic extend and return lines from the hydraulic cylin-
der.
7. 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. (If installed, use
the optional crane lifting lug on the top back of the
mast.)
8. Remove the four (4) mast support bolts/nuts/wash-
ers from the mast support midway on the mast.
9. Remove the four (4) mast attach bolts with washers
and nuts securing the mast to the base frame
mount.
10. 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 Assembly
Removal instructions, however perform the following addi-
tional 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.
Mast Assembly - Remove/Install
1. Pump Mounting Weldment Bolts/Nuts/Washers
2. Mast Brace Support Bracket Bolts/Nuts/Washers (a)
3. Base Frame - Mast Mounting Bolts/Nuts/Washers (a)
Notes: (a) Apply Loctite #242 to bolt threads on final assembly.
1
2
3