Cleaning and Inspection - TM-10-3930-632-340040

TM 10-3930-632-34

a. Unscrew gland nut (3); slide the nut off over

the primary rod (6) and remove the wiper (2) from the

4-6. Reassembly

gland nut. Hold the stationary tube assembly (13) and

Refer to figure 4-1 and reassemble the lift cylinder. Note

loosen the gland cap (20). Slide the barrel (1) off the

the following:

assembled primary piston, secondary rod assembly (15),

and stationary tube assembly (13). Remove the packing

a. Immerse all parts of the hydraulic lift cylinder in

assembly (10), retainer (12) and packing (4) from the

clean hydraulic oil to lubricate them before Reassembly.

body; remove the back-up ring (24) and preformed

b. Slide the piston rod assembly (15) into the

packing (25) from the cylinder head.

stationary tube assembly (13). Position the gland cap

b. Unscrew the gland nut (17) from the cylinder

(20) on the piston rod assembly and turn the cylinder

head and slide it off the secondary rod assembly (15).

head onto the stationary tube assembly (13). Install

Unscrew the gland nut (3) and slide the assembled

setscrew (22) and lock screw (23) in gland cap (20) and

secondary rod assembly (15) and stationary tube

secure. Torque the cylinder head to a minimum of 300

assembly (13) out of the primary piston.

ft/lbs. Position the packing springs (11) in the retainer

c. Remove lock screw (23) and setscrew (22)

(19) and slide the assembled retainer and adapter into

from gland cap (20). Hold the stationary tube assembly

the cylinder head over the end of the piston rod

(13) and remove the cylinder head.

Remove the

assembly.

stationary tube from the piston rod assembly. Slide the

c. Position packing assembly (18) into gland cap

cylinder head off the piston rod assembly.

(20) and tap into place. Position wiper (16) into the gland

nut (17); slide the assembled gland nut over the piston

NOTE

rod assembly and into the cylinder head. Tighten the

Do not remove the plug (14) unless obviously

gland nut into the cylinder head.

damaged.

Remove the packing assembly (18),

d. Slide the primary rod (6) over the assembled

retainer (19) and packing springs (11) from The

stationary tube and piston rod assembly. Position the

cylinder head. Remove the two setscrews (26) and

packing springs (11) in the retainer (12); slide the

bleeder valves (27) from the body and stationary tube

assembled retainer and adapter into the primary piston

assembly.

over the stationary tube assembly. Position wiper (2) in

the gland nut (3). Slide the gland nut over the stationary

WARNING

tube assembly and tighten the gland nut in the primary

Dry cleaning solvent, P-D-680, used to clean

piston.

parts is potentially dangerous to personnel and

e. Position the back-up ring (24) and preformed

property. Avoid repeated and prolonged skin

packing (25) on the cylinder head. Slide the barrel (1)

contact.

Do not use near open flame or

over the assembled primary piston, stationary tube

excessive heat. Flash point of solvent is 100 F.

assembly and piston rod assembly; turn the body onto

- 138 F. (39 C. - 59 C.).

the cylinder head and torque to a minimum of 300 ft/lbs.

Tap packing assembly (4) into position in barrel (1).

4-5. Cleaning and Inspection

Position wiper (2) in gland nut (3); slide gland nut over

a. Replace all seals, wipers, and other

the primary piston assembly and tighten in body. Turn

unserviceable parts.

the set-screws (22) into the lock screws (23); turn the

b. Clean all metal parts thoroughly in cleaning

two assembled bleeder valves into the hydraulic lift

solvent P-D-680. Dry thoroughly with compressed air.

cylinder.

CAUTION

4-7. Installation

Do not allow dirt to get on disassembled parts

Install and bleed the lift cylinder (para 2-6b ).

after cleaning.

c. Check all metal parts for cracks, burrs, rust,

distortion, scores, or other damage. Remove burns rust,

with a fine stone. Replace damaged parts.

Section III. HYDRAULIC PUMP

is drawn into the low-pressure side of the unit and is

4-8. General

trapped in the compartments between the vanes and ring

until it is transferred to the high-pressure side of the

The main hydraulic pump is a vane-type rotary pump in

pump where it is discharged. The rotor is mounted on a

which vanes are installed in slots of a close-fitting rotor

ball bearing-mounted drive shaft to assure free rotation.

which rotates in an eccentrically positioned ring. The oil

4-3