48 frame or 56 -whats the difference ?

Simply put the 48 frame is smaller in motor housing diameter than the 56 frame. If you look at the 4 bolts that run from the back of your motor and go all the way to the front and hold the plastic wet on -- if you measure across from side to side -the 48 frames will measure approx 3-9/16s, were the 56 frame motors will measure 4-1/8 inch across. So if your bolt pattern is under 4 inches -you have a 48 frame motor, if your bolt pattern measures over 4 inches you have a 56 frame motor.

This is important to know -specially if your ordering a wet end . The mounting foot is also going to be slightly different and sometimes the overall length can be different.

DOUBLE CHECK YOUR FRAME SIZE --USE A TAPE MEASURE as some pumps are labeled 56Y buy still measure the same as a 48 frame.

What if my pump doesnt use bolts that go through the motor nor does it have a 48 or 56 frame distinction ? Mine has 4 large, short bolts just in the front part.


Thanks -G

Sounds like you may have a Square Flange --these are used mainly for pools or in deck spas that have a separate motor/pump set up somewhere other than in the spas cabinet. These are usually a Sta-Rite brand -or Pentair . These do require a completely different wet end and mounting. Your square flange is not interchangeable with most of the pumps on the hottubworks.com web site. These are easy to work on but do generally cost more to get parts. We can break it down for you once we know which pieces you need. Let me know -or call 800-770-0292


thanks marc

This was helpful but what was even MORE helpful was using this with a photo that shows a simple way to tell while measuring!

By going to the following link and looking at the photo - the right side demonstrates the difference. The top is the 56 frame and the lower is the 48 frame, Notice the placement of the screws!

http://www.hottubworks.com/Images/Sp...y_Exec_pop.jpg

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Originally Posted by marc

Simply put the 48 frame is smaller in motor housing diameter than the 56 frame. If you look at the 4 bolts that run from the back of your motor and go all the way to the front and hold the plastic wet on -- if you measure across from side to side -the 48 frames will measure approx 3-9/16s, were the 56 frame motors will measure 4-1/8 inch across. So if your bolt pattern is under 4 inches -you have a 48 frame motor, if your bolt pattern measures over 4 inches you have a 56 frame motor.

This is important to know -specially if your ordering a wet end . The mounting foot is also going to be slightly different and sometimes the overall length can be different.

DOUBLE CHECK YOUR FRAME SIZE --USE A TAPE MEASURE as some pumps are labeled 56Y buy still measure the same as a 48 frame.

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