Replace Pump Impellor
Ensure that all electrical power is shut off and disconnected before proceeding. The
circuit breaker box or individual circuit breaker should be locked and tagged out by
personnel following this procedure. Remember that the CBL is a wet environment.
Serious injury or death to personnel can result from electrocution if proper safety
precautions are not observed.
1. Disconnect power by switching circuit breaker No. 15, 17, and 19 to OFF, and drain pump.
2. Remove insulation and heat trace.
3. Remove bolts, washers and nuts retaining pump motor (Figure 3, Item 4) to pump mount (Figure 3,
4. Remove bolts retaining pump adapter (Figure 3, Item 6) to casing (Figure 3, Item 7), and pull pump
rearward to expose impellor (Figure 3, Item 8).
5. Remove the dust cap (Figure 3, Item 9) from the motor.
Depending on the individual pump, the pump shaft may be secured in place by either
sticking a large flat blade screwdriver in a slot in the shaft at the motor end, or by placing
an open-end wrench on flats formed onto the shaft. Inspect your pump carefully to
determine which method may apply.
6. Secure the pump shaft (Figure 3, Item 10), and remove the acorn nut retaining the impellor.
7. Unscrew the impellor (Figure 3, Item 8) from the pump shaft (Figure 3, Item 10).
8. Install the replacement impellor (Figure 3, Item 8), and retain with acorn nut.
9. Seat the pump adapter (Figure 3, Item 6) to the pump casing (Figure 3, Item 7) and retain in place
10. Install the dust cap (Figure 3, Item 9) onto the motor.
11. Secure the pump motor (Figure 3, Item 4) to the pump mount (Figure 3, Item 5) with bolts, washers,
12. Install insulation and heat trace.
13. Operate pump IAW procedures given in TM 10-3510-226-10, and monitor for normal operation.