# - NOT SHOWN

Notes:
1. Used on 2F, 2-1/2A pumps built after 10-1-92.
2. Used on 2F, 2-1/2A pumps built prior to 10-1-92. Must replace w/both diffuser, 355545 & impeller 355604.
3. Must be used with item 3, P/N 355317.
3. New style pump base, (item 11) includes dual radius motor support adapter (item 11B), which fits both 5-5/8 in. & 6 1/2 in. dia. motors.
4. Item 11A motor support is a replacement part that fits only older style pump bases with rectangular opening.
5. Carriage bolt (item 18) fits prev. style clamp band assy. (item 7).

Note 1: Challenger booster pumps consist of items 1-20.
Note 2: Challenger pool pumps consist of all items except item 15.

** Please Note **

Replacement motors may or may not come with the shaft internally threaded as the original OEM motor.  It is not a requirement for replacement motors.  Replacement motors are copies of OEM designs and the tapped hole exists only because OEM customer requested it.  Since certain replacement motors have been released having this feature, some customers have come to expect it assuming that the threads are necessary or there will be a problem with the impeller coming off.  This is not a correct assumption.  AO Smith has built replacement motors without the threaded holes for over thirty years and is not aware of any case where the impeller has spun off.  If the lack of a threaded hole remains a concern, they suggest using Loc-tite or a similar product to alleviate the concern.