2. CENTRIFUGAL PUMP PRESSURE LOW OR FALLING.
Step 1. Check for damaged or missing key between pump groove pulley and pump shaft.
Replace key (para 2-21).
Step 2. Check centrifugal pump for binding or noisy operation.
Replace centrifugal pump.
Step 3. Check centrifugal pump for vibrations.
Replace centrifugal pump.
3. CENTRIFUGAL PUMP FAILS TO OPERATE.
Check centrifugal pump for broken pump impeller, diffuser, or annular ball bearings.
Replace pump impeller, diffuser, or annular ball bearings (para 2-22).
4. PLUMBING VALVES LEAK.
Step 1. Check for loose pipe connections.
Tighten pipe connections.
Step 2. Check for loose valve body assembly (1).
Tighten valve bonnet nuts and bolts (2).
Step 3. Check for damaged or split valve diaphragm.
Replace valve diaphragm. For VALVE NO. 1 see paragraph 2-23. For
VALVE NOS. 2 and 3 see paragraph 2-24.
Step 4. Check for cracked or broken valve body (1).
Replace valve. For VALVE NOS. 1,2, and 3 see paragraph 2-21.
2-3
TM 3-4230-209-30&P
