TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 263 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cent)

~

2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).1

Table 2-9. Troubleshooting (Cent)

Malfunction

Test or Inspection

Corrective Action

DUAL AIR BRAKE SYSTEM

(CONT)

5. SPRING BRAKES WILL NOT APPLY (CONT)o

&

I

PARKING

,

<

BRAKE

)

,.4

VALVE

LINE

J

&

NO. 612

Step 3.

Step 4.

Step 5.

I’%

SPRING BRAKE

~ AIR LINE

LINE

NO. 622

‘Ill

TA357242

Apply spring brakes. Disconnect line No. 612 at parking brake valve. Listen for air

escaping.

If air escapes, replace defective parking brake valve (para 11-20).

Apply spring brakes. Disconnect line No. 622 at spring brake control valve. Listen for air

escaping.

If air escapes, replace defectve spring brake control valve (para 11-17).

TA184187

Apply spring brakes. Loosen spring brake air line on brake chamber.

If air escapes out of air line, replace defective spring brake relay valve

(para 11-13).

If no air escapes, check for binding slack adjusters or damaged brake chamber,

repair or replace components as required.

2-170