BRAKES AND AIR SYSTEM-continued -714670045

TM 5-2420-224-34

Table 2-1. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

BRAKES AND AIR SYSTEM (CONT)

Step 2.

Check fluid regulating valve adjustment as follows:

a. Relieve air pressure (TM 5-2420-224-20) completely from air tanks (1 and 2).

b. Attach 0-200 psi (0-14 bar) pressure gage to test connection (3).

NOTE

When fluid regulating valve reaches cut-out pressure, there will be an audible "pop".

Start and run engine at idle until fluid regulating valve reaches cut-out pressure.

d. Compare pressure readings between 0-200 psi (0-14 bar) pressure gage and dual

brake gage. Both readings must be approximately 106 psi (7.3 bar).

If both readings are not approximately 106 psi (7.3 bar), turn fluid

regulating valve adjusting screw (4) 1/4-turn to right to increase

pressure, or 1/4-turn to left to decrease pressure. Relieve air

pressure (TM 5-2420-224-20) from air tanks (1 and 2) to approx-

imately 80 psi (5.5 bar) and repeat steps c and d until cut-out

pressure is approximately 106 psi (7.3 bar).

If correct cut-out pressure cannot be attained, replace fluid regulating

valve (TM 5-2420-224-20).