Page 27
263920 R 2
S
ervice
5.2-8
Free Lift Cylinder Service
1.
Remove the cylinder from the Mast as described in
Section 5.2-4.
2.
Use a claw-type spanner wrench and a strap wrench
to remove the retainer from the shell (see Figure 24).
3.
Remove the plunger/piston assembly from the shell.
4.
Inspect all components for nicks or burrs. Minor nicks
or burrs can be removed with 400-grit emery cloth.
NOTE:
Minor nicks are those that will not bypass oil
when under pressure. If they cannot be removed with
emery cloth, replace the part. If the piston requires
replacing, refer to Section 5.2-9.
5.
Replace the retainer and piston seals, back-up rings,
O-rings, and bearing.
Lubricate the new seals with petroleum jelly prior to
installation.
Note the correct seal directions. The
seal lip always points toward the pressure side of
cylinder
. The cylinder will not operate correctly if the
seals are installed backwards.
6.
Install the plunger retainer on the plunger. Install the
plunger/piston assembly into the cylinder shell. Pour
1/2 cup (120 ml) hydraulic fluid into the cylinder
cavity between the shell and rod. Using the claw
spanner and strap wrenches, tighten the
retainer to 95-125 ft.-lbs. (129-169 Nm).
Cylinder
Shell
Piston
Retainer
Claw-Type
Spanner
Strap
Wrench
MA0235.eps
MA0994.eps
6
5
3
5
2
Figure 24. Removing or installing plunger/
piston using a claw-type spanner and strap
wrench.
Figure 25. Free Lift Cylinder.
TYPICAL ILLUSTRATION