Section II. REPAIR OF HYDRAULIC LIFT CYLINDERS

compressed air. If filler screen cannot be cleaned,

4-4. Hydraulic Reservoir

replace with new filler screen.

a. Description.

The purpose of the hydraulic

d. Reassembly. Reverse the procedure as

reservoir is to hold sufficient oil for the entire hydraulic

outlined in c above.

system. It consists of a 7.2 gallon tank, combination filler

e. Installation. Refer to TM 10-3930-618-20 for

and plug and dipstick, and a washable breather cap. It is

hydraulic tank installation.

attached to the frame on the left side of the truck. The

suction line on one end of the tank is located near the

bottom to prevent air from being drawn into the pump,

causing pump noise and erratic operation of the system.

The return line is connected to the opposite end of the

tank, also near the bottom. This is to help prevent

foaming of the oil. A magnetic drain plug is provided on

the bottom of the tank to drain out all the oil when

necessary. A screen is located in the, auction line

between the reservoir and pump at the junction midway

of the line.

CAUTION

Always refer to LO 10-3930-618-12.

NEVER USE BRAKE FLUID. Make

sure containers and surrounding

parts are clean when filling tank, to

prevent dirt from contaminating the

oil.

b. Removal. Refer to TM 10-3930-618-20 for

hydraulic tank removal.

c. Disassembly. Refer to figure 4-3 and

disassemble the tank as follows:

(1) Remove all plugs, fittings, breather cap

and dipstick from the reservoir.

(2) Clean outside of reservoir with cleaning

solvent.

(3) Thoroughly flush reservoir with solvent to

remove dirt or other sediments.

(4) Inspect reservoir for bad dents, cracks,

and leaks. Replace reservoir if cracked or badly dented.

(5) Inspect for damaged or worn threads in

openings.

Repair damaged threads by chasing if

practical, otherwise replace the reservoir.

(6) Check filler screen for clogging or

Figure 4-3. Hydraulic reservoir.

damage.

Clean screen with cleaning solvent and dry with

Section II. REPAIR OF HYDRAULIC LIFT CYLINDERS

should not be called upon to hold any bending action due

4-5. Tilt Cylinders

to misalignment.

a. Description. The two double acting till cylinders

b. Removal.

Refer to paragraph 2-12 for tilt

provide the means for tilting the mast assembly 30

cylinder removal and installation.

forward and 100 back. They are located under cowls on

c. Disassembly.

Refer to figure 4-4 and

each fender. Action of the tilt cylinder is a straight line

disassemble the tilt cylinder as follows:

motion. Any misalignment between the cylinder and

(1) Secure tilt cylinder in bench vise. Be

piston will cause binding, rapid wear of packing and

careful not to deform cylinder.

packing gland, rapid wear of piston rod and packing, and

(2) Loosen capscrew in yoke (27) and

tend to break the weld on the cylinder case. The welded

unscrew yoke from plunger rod (16).

section is designed to hold hydraulic pressure and

4-6