JLG sky trak mmv Service Manual page 474

Hydraulic System
5. Note the orientation of each fitting. Remove the
fittings from the cylinder being removed. Plug the
ports on the cylinder.
6. Remove the fork shaft retainer (1) from the right side
of the carriage (2). The two mounting screws (3)
have Loctite (blue) 242 threadlocker applied to the
threads. Thoroughly clean the threads of each
screw.
7. From the left side of the carriage, push the fork shaft
(4) out the right side of the carriage. The fork shaft is
heavy, use a suitable hoist and slings to hold the
shaft during removal. Push the fork shaft out and
remove both forks and the fork shaft from the
carriage.
2
3
1
3
8. For the cylinder being repaired, locate and remove
the capscrews (5) and hex nuts (6) holding the
cylinder retainer plates (7), cylinder retainer shims
(8) and cylinder retainer spacer cams (9) to the
mounting plate on the carriage (10). Note the
number of shims and plates as you remove them.
9. After the retainer plates and shims are removed,
slide the cylinder toward the center of the carriage.
Remove the base end of the cylinder from behind
the retaining plate on the outer edge of the carriage.
Remove the cylinder from the carriage.
10. Remove the cylinder rod end pawl (11) from the
cylinder (12). The cylinder rod end pawl has Loctite
applied to the threads. Heat the pawl to remove it.
9.176
4
MM3931
10
6
8
7
9
Note: Heating the cylinder rod end pawl to approxi-
mately 300° F (150° C) will be required to break the seal
formed by the Loctite Threadlocker #277 (red) applied to
the threads of the cylinder rod. Avoid overheating or the
parts may become distorted or damaged. Apply suffi-
cient torque or pressure for removal while the parts are
still hot.
Breakdown of sealant will leave a white, powdery residue
on threads and parts. Clean the residue away with a soft
brass wire brush prior to reassembly, and wipe with Loc-
tite "T" cleaner before reinstallation.
11. When the pawl is being heated the pawl pads (13)
will be loosened by the heat and will fall out of the
pockets in the pawl. New pawl pads will be required
for reassembly.
12. Clamp the pawl in a vise, while supporting the
cylinder use a large flat blade screwdriver to turn the
cylinder rod. Insert the screwdriver in the hole in the
end of the pawl and into the slot (14) in the end of
the cylinder rod. Remove the pawl from the rod.
12
5
MM3941
13
14
11
MM3950
Model MMV Rev. 12/04