AIR HORN DOES NOT WORK.

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

AIR SYSTEM (CONT)

11. WINDSHIELD WASHER DOES NOT WORK (CONT).

Step 2. Check for defective cab pressure protection valve (go to MALFUNCTION 10, LEFT OR

RIGHT WINDSHIELD WIPER DOES NOT WORK, Step 1, then come back to Step 3).

Step 3. Check windshield washer control valve for air supply in and air supply out when

windshield washer control valve is operated.

If windshield washer control valve has air supply in, but not out, replace defective

windshield washer control valve (para 18-8).

Step 4. Check for leaking, plugged, or damaged air lines.

Remove restriction and repair damaged airhoses.

12. AIR HORN DOES NOT WORK.

Step 1. Check air horns for loose connections or damage.

Tighten loose connections, replace damaged air horn (para 18-7).

Step 2. Check air horn control valve for loose connections or damage.

Tighten loose connections, replace damaged air horn control valve (para 18-6).

Step 3. Check for defective pressure protection valve (go to MALFUNCTION 10, LEFT OR RIGHT

WINDSHIELD WIPER DOES NOT WORK, Step 1).

Replace defective pressure protection valve (para 11-16).

WARNING

Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only

with effective chip guarding and personal protective equipment, goggles, shield, and

gloves.

Step 4. Check air horn control valve. Remove air horn control valve (para 18-6). Blow low pressure

compressed air into air horn control valve with control valve lever actuated.

If air does not flow through air horn control valve, replace air horn control valve

(para 18-6).

If air flows through valve, replace defective air horns (para 18-7).