TM 10-3510-226-23
0074 00
REPLACE
Replace the Circulation Pump
WARNING
Ensure that all electrical power to the boiler 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.
WARNING
Allow the boiler and any associated hot water pipe, tubing or fixtures to cool at least 30
minutes before attempting any repairs. Failure to observe safety precautions may result
in serious injury or death to personnel.
NOTE
Replacement of this component may be easier if washer No. 1 is removed.
1. Disconnect power by switching the circuit breaker No. 22 to off.
2. Remove the coolant reservoir IAW procedures given in WP 0073 00.
3. Drain boiler of glycol. Retain glycol for refill.
4. Remove screws retaining junction box cover (Figure 2, Item 1), and remove cover.
5. Tag and disconnect wiring.
6. Remove locknut retaining conduit (Figure 2, Item 2), and remove conduit.
7. Remove bolts, washers, and nuts retaining pump (Figure 2, Item 3) to pump flanges (Figure 2, Item
4), and remove pump.
8. Install new flange gaskets.
9. Install replacement pump (Figure 2, Item 3), and retain with bolts, washers, and nuts.
10. Remove screws retaining junction box cover (Figure 2, Item 1) on replacement pump (Figure 2, Item
3), and remove cover.
11. Knock out conduit penetration in junction box (Figure 2, Item 1), if necessary.
12. Install conduit (Figure 2, Item 2), and retain with locknut.
13. Connect wiring as tagged.
14. Install junction box cover (Figure 2, Item 1) and retain with screws.
Change 1
0074 00-3
