Figure 3-26. Primary lift cylinder, exploded view.

rough spots in the grooves. Repair or replace the piston-

(3) Lightly lubricate the wiper ring (2) with

rod assembly as necessary.

hydraulic fluid and install the assembly into the tube

(4) Inspect all metal surfaces where packings

assembly (13).

or seals are located. If the surfaces are scored or

(4) Tighten the gland nut with a spanner

nicked, replace the parts or resurface them.

wrench until the face of the nut is flush with the outer end

d. Reassembly. (fig. 3-25.)

of the tube assembly.

(1) Install all new rings and packings in the

3-19. Primary Lift Cylinder

cylinder. Soak the packings in hydraulic oil before in

a. Removal. Remove the primary lift cylinder

stalling.

according to paragraph 2-17.

Caution: Do not use sharp tools or

b. Disassembly.

(1) Place the cylinder assembly in a bench

instruments when installing packings.

When

vise and drain any remaining oil.

installing rings, do not stretch them more than

(2) Remove the packing nut (1, fig. 3-26)

absolutely necessary.

from the tube assembly (11). Remove the wiper ring (31,

(2) Install the gland nut (1) on the piston-rod

preformed packing (4 and 5), and backup ring (6).

assembly (7). Screw the yoke (20) on the rod and

(3) Using a spanner wrench, remove the stop

secure in place with the screw (21), lock washer (22),

ring (7).

and nut (23).

(4) Remove the plunger assembly (8) and

bearing (9) from the tube assembly (11).

Figure 3-26. Primary lift cylinder, exploded view.

c. Cleaning, Inspection and Repair.

on the sliding surfaces, stripped threads, and other

damage which may cause internal or external leakage.

(1) Clean all metallic parts with cleaning

(4) Replace all defective parts.

solvent.

d. Reassembly.

(2) Discard all preformed packings.

(1) Place tube assembly (11, fig. 3-26) in a

(3) Inspect the plungers, packing nut, bearing,

vise. Be careful not to tighten excessively as this will

and tube assembly for cracks, nicks, scores, dents, wear

deform the tube.

3-41