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 197 of 694

TM 5-3895-372-20

Table 6-1.

Admix Systems Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

AIR PRESSURE CANNOT BE MAINTAINED AT 15 PSI (103 kPa):

Step 1.

Check for open draincocks and vents.

Close all draincocks and vents.

Step 2.

Use soap solution to check for air leaks.

Tighten loose fittings.

Replace leaking valves or lines (para 6-14).

Step 3.

Turn regulator in both directions.

Watch gage for pressure response.

Replace faulty regulator (para 6-14).

Step 4.

Attach pressure gage between regulator and gate valves.

Check that it reads the

same as pressure gage installed on regulator.

Replace pressure gage (pare 6-14).

Step 5.

Increase pressure to 18-20 psi (124-138 kPa).Check that relief valves vent when

pressure reaches 18-20 psi (124-138 kPa).

Adjust relief valve (para 6-17).

Step 6.

Check for blockage in supply line.

Remove obstruction or replace line (para 6=14).

Step 7.

Check compressed air system for leaks.

Troubleshoot compressed air system (para 11-5).

2.

LIQUID ADMIX FLOWS UNEVENLY:

Step 1.

Check for 14½ - 15'

psi (100-107 kPa) air pressure.

See Malfunction No.

1.

Step 2.

Check for leaks.

Tighten loose connections.

Replace leaking lines or valves (para 6-14).

Step 3.

Check for dirt or sediment in system.

Flush system.

First use cleaning agent recommended by admixture manufacturer.

Then use clean water.

6-3