Table 2-2. Unit Troubleshooting - CONT
Test or Inspection
STEP 3. Check for air leaks in suction piping.
Shut off or plug inlet. Put line under pressure. A drop in pressure gauge reading indicates a leak.
Locate and correct (TM 55-1905-223-24-18).
5. Pump draws excessive amperage.
Check to see if stuffing box is too tight.
Release gland pressure; then tighten. Ensure gland sets evenly (paragraph 2-24).
Check to see if cooling liquid does not flow into mechanical seal while pump operates.
Check tightness of mechanical seal (paragraph 2-24).
STEP 2. Check to see if speed is too high.
Check voltage or frequency on motor (paragraph 2-6, (2)).
STEP 3. Check for electrical problems.
a. Check voltage and frequency input to motor (paragraph 2-6, (2)).
b. Check for obstructions around motor ventilating cap. Remove obstructions.
6. Pump air bound.
STEP 1. Check for air trapped in line.
Bleed the line from suction end of pump. Prime the pump.
AUXILIARY FIRE PUMP ASSEMBLY
7. Liquid not being pumped.
STEP 1. Check for prime.
a. Fill pump casing and suction pipe with water (paragraph 2-6).
b. Open petcocks at top of pump and let trapped air escape.
STEP 2. Check to see if pump is not up to speed.
Increase speed of driver (TM 55-1905-223-10).
STEP 3. Check to see if discharge head is too high.
a. Check to see that all discharge valves are in open position (TM 55-1905-223-10).
c. Check discharge piping for obstructions