TM-5-3895-372-20

CONCRETE-MOBILE MIXER BODY M919, MODEL 8CM-24/F

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE MANUAL

AUGUST 1980

TM-5-3895-372-20 - Page 540 of 694

TM 5-3895-372-20

Table 11-1.

Air System Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. AIR PRESSURE IS LOW (Below 65 psi, 448 kPa):

Step 1.

Check that air tank draincock is closed.

Close draincock.

Step 2.

Check that air control valve is open.

Open valve.

Step 3.

Check that fluffer valve and vibrator valves are not stuck (para 11-11 and 11-14).

Lubricate valves.

Replace if necessary.

Step 4.

Check air filter for loose or broken bowl or defective O-ring.

Tighten bowl or replace filter (pare 11-13).

Step 5.

Use soap solution to check for leaks in air system.

Replace leaking lines or valves.

Step 6.

Troubleshoot chassis air system (refer to TM 9-2320-273-20).

2. CEMENT IN BIN IS NOT PROPERLY AERATED.

Step 1.

Check that air pressure is above 65 psi (448 kPa) (see TM 9-2320-273-10).

Refer to Malfunction No.

1.

Step 2.

Check air supply to air pads.

a. Remove air hoses at bottom outside of bin.

b. Actuate manual control valve.

Check for air from hoses.

c. If no air comes out, disconnect hose from manual control valve.

Actuate valve.

(1) If air comes out, hose is blocked.

Remove block or replace hose (pare 11-12).

(2) If no air comes out, valve is blocked or broken.

Clean or replace valve (para 11-12).

Step 3.

Check filter cloth.

a. Empty bin until cement is 3-5 in.

(7.6-12.7 cm) deep.

11-3