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spots. Remove any rough spots in the grooves.
and check for hydraulic leaks. Make sure the tilt
Repair or replace the piston and rod assembly as
cylinders bottom simultaneously.
necessary.
5-9. Primary Lift Cylinder
(4) Inspect all metal surfaces where packings
a. Removal.
or seals are located. If the surfaces are scored or
(1) Lower the fork carriage and remove the
nicked, replace the parts or resurface them.
carriage backrest (para 6-3).
d. Reassembly. (fig. 5-13.)
(2) Free the cylinder end of its lift chains (TM
(1) Install all new seals and packings in the
10-3930-624-12).
cylinder. Soak the packings in hydraulic oil before
(3) Remove the bleed screw (1. fig. 5-14) from
installing.
the outer cylinder and insert a high pressure air
Caution: Do not use sharp tools or in-
hose. With the lift control lever held in the DOWN
struments when installing packings. When
position, blow the oil out of the cylinder back into
installing seal rings, do not stretch them more
the reservoir.
than absolutely necessary.
(4) Disconnect the high pressure hose.
(2) Install the packing (11) and wiper ring
(5) Disconnect hydraulic lines to the cylinder.
(10) into the packing gland (2).
Cap or plug openings.
(3) Install the backup ring (13), performed
(6) Remove the mounting hardware securing
packing (12), spacer (15), and preformed packing
the cylinder to the mast assembly.
(14).
Caution: Be careful not to damage the
(4) Install the tee ring (5) and bearing (4) on
cylinder assembly when removing it from the
the piston.
mast assembly.
(5) Install the packing gland (2) on the rod
(7) Attach a chain securely around the outer
(10). Screw the yoke (9) on the rod and secure in
case of the cylinder assembly below the chain bolt
place with the capscrew (8), lockwasher (7). and
flanges and remove the cylinder assembly.
nut (6).
b. Disassembly.
(6) Lightly lubricate the piston seals with
(1) Place the cylinder assembly in a bench vise
hydraulic fluid and install the rod and yoke
and drain any remaining oil.
assembly into the cylinder tube.
(2) Remove the gland (2, fig. 5-14) from the
(7) Tighten the packing gland with a spanner
cylinder tube. Remove the wiper ring (3). packing
wrench and reinstall the pin (1).
(4), preformed packing (6) and ring (7) from the
e. Installation. Install the tilt cylinder in the
gland.
reverse order of removal. Start the engine and
operate the mast through several complete cycles
5-14

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