Primary Lift Cylinder

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