Replacing clutch with pulley

[hydracat]

The clutch specs on a cat 290 says 7 inches. The one I ordered is 5 inches. Now I have too much slack to get it tight. I held up a 7 inch pulley I had lying around and it seamed too tight. Wrong shaft size or I would have used it. Does anyone know the proper pulley size to replace a clutch?

 

[FB19087]

7"
16.5mm shaft


or get a shorter belt

pump rpm specs
http://www.catpumps.com/products/pdfs/280_D.pdf

Clutch:
ogura ma-7a-bu (model on my 290 single groove)

the cat model numbers depending on grooves needed:

https://www.kleen-ritecorp.com/Images/34960_D.pdf

single groove to fit 290
https://www.kleen-ritecorp.com/p-16007-cat-pump-34961-7-clutch-assembly-for-3fr-3pfr-4fr-pumps.aspx

 

[Lee Stockwell]

Quick and dirty solution is the shorter belt, less than $10.

Pump will turn a little faster.

 

[hydracat]

The coupler between the blower and motor looks like a big piece of rubber screwed in on each side. Im afraid if I mess with it to go with a shorter belt it may be out of balance when I put it back together.

 

[FB19087]

I don't think that would be an issue........

 

[KevinD]

The coupler between the blower and motor looks like a big piece of rubber screwed in on each side. Im afraid if I mess with it to go with a shorter belt it may be out of balance when I put it back together.

If you have the Dodge coupler (PX-70) that looks like a little tire with 5 bolts on each side holding it, it is very simple to remove and reinstall for a belt change and won't go out of balance.
If you think it is beyond your mechanical expertise to remove the coupler pick up a link belt and put that on.
You don't have to take out the coupler to put on a link belt.