Section XIII. MAINTENANCE OF THE PROPELLER SHAFTS

TM 10-3930-634-12

4-54. Transmission Linkage

with the detent positions of the transmission speed

control valve. If out of adjustment, report to direct sup-

a. General. Check all linkage between operator's

controls and transmission frequently. Remove console

port maintenance.

(2) Forward-neutral-reverse control linkage. Make

panel cover and inspect the linkage for proper lubrica-

sure the operator's control (figure 2-1) is positioned to

tion, cleanliness, wear, damage, and freedom of opera-

tion.

correspond exactly to the transmission control valve

(1) Speed control linkage. Make sure the operator's

detents. If out of adjustment, report to direct support

control (figure 2-1) is positioned to correspond exactly

maintenance.

Section XIII. MAINTENANCE OF THE PROPELLER SHAFTS

4-55. Propeller Shaft and Yoke Flange

damage.

b. Service. Service propeller shafts and yoke flanges

a. Inspection. Inspect propeller shafts and yoke

flanges for cracks, breaks, broken welds, or other

in accordance with current lubrication order.

Section XIV. MAINTENANCE OF THE BRAKES

4-56. General

operation.

This section contains information on the maintenance

b. Hydraulic Brake System Bleeding Procedure.

of those components of the brake system which is the

(1) Fill reservoir with hydraulic oil (OE/HDO 10).

NOTE

responsibility of organization maintenance personnel.

Resevoir must be free of dirt. A

4-57. Service Brakes

screen should be provided in the

a. General. The service brakes are of the expander-

reservoir to keep out foreign parti-

tube-type, hydraulically operated. Pressure is supplied

cles.

by an engine-driven hydraulic pump, and application

(2) With the engine idling, open each bleeder valve

is controlled by an applicator valve located under the

(located on top of automatic slack adjuster, figure 4-31)

operator's floor plate. The brake system is supplied

and depress brake pedal until oil flows free of air. Close

with oil (OE/HDO 10) from the main hydraulic reser-

bleeder valves.

voir. Brake adjustment is accomplished automatically

(3) Apply brakes, holding pedal down for at least

by slack adjusters (figure 4-31) located in the hydraulic

10 seconds. Repeat this cycle three times, allowing 30

lines between the applicator valve and the wheel brake

seconds between applications.

assemblies. No provision is made for manual adjust-

(4) Release brakes and open all four bleeder valves.

ment. If adjustment malfunction occurs which cannot

Bleed fluid from valve until flow stops, then close

be corrected by the bleeding process, report to direct

bleeder valves.

support maintenance. Do not attempt to repair a defec-

(5) Repeat steps 3 and 4 until no air can be

tive slack adjuster, replace it. Lining wear can be

detected escaping from fluid.

detected by observing the arc of the brake lining

(6) Repeat the entire bleeding procedure if the

retract springs. Retract springs are visible on inboard

brakes show any evidence of dragging or overheating

side of brake assembly just below the outer circum-

during the first few hours of operation.

ference of the backing plate. Flattened springs (with

NOTE

the brakes off) indicate the need for lining replace-

Brakes should be checked for air

ment. With lining in good condition, springs will form a

after the first shift of operation.

Shallow arc. Check brakes for air after the first shift of

4-29