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 132 of 694

TM 5-3895-372-20

Table 5-1.

Water System Troubleshooting Procedures (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

MIX WATER DOES NOT FLOW AT A STEADY RATE (Continued):

NOTE

If a pressure gage is not available, adjust pressure so that water can be sprayed

about 35 ft with washout hose.

Step 8. Check for air trapped in water lines.

Bleed air by squirting water from the washout hose until it flows in a steady stream.

Step 9. If temperature is below 320F (0°C) check for frozen water lines.

a.

Open draincocks.

b.

Apply heat to melt ice.

c.

When system is free of ice, close draincocks.

2.

WATER LINE VALVES LEAK:

a.

Engage PTO. Pump speed should be 1620-1720 rpm.

b.

Check each valve for leakage.

Replace leaking valves (para 5-12 & 5-13).

3.

QUICK-OPENING VALVE STICKS;

Step 1. Check for sticking or binding as valve is opened and closed.

a.

Lubricate valve stem with engine oil. Repack rubber boot,

if necessary.

5-4