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James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3708
Experience:  7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
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what size belt fits a mtd yardman 125 with a 38 inch cut and

Resolved Question:

what size belt fits a mtd yardman 125 with a 38 inch cut and a 12.5 horse power think there are 3 belt
Submitted: 7 years ago.
Category: Small Engine
Expert:  James W replied 7 years ago.
-Could you explain your situation a little more?
what is the model and serial number of the unit and which belt or belts are we inquiring about?
Customer: replied 7 years ago.
numbers are very worn and can not read them and it is a drive belt i am after
Expert:  James W replied 7 years ago.

can you read any part of them?

Do you know what year it was made

are their numbers on the engine?


it will be very hard to be able to identify the parts without some additional information.


If you look really hard, can you see any numbers on the belt itself.

Customer: replied 7 years ago.
i think the model number is450F670 the engine is a briggs and stratton 12.5 hp model28V707 type 1170-E1 and code 981026ZD does that help
Expert:  James W replied 7 years ago.

I am working on this now. The engine shows that It was made in 1998 so the unit was made in 1998 or 1999. There is no exact match/


But 450F seems correct.

Is there a prefix before the 450F ???

Expert:  James W replied 7 years ago.

Also, are there any other markings on the unit say on the hood or fenders


such as yard machine or 125-38 or anything?



Expert:  James W replied 7 years ago.

MTD list a model 13AH450F022


Which uses a 38 inch deck and the Engine -- B&S 13 hp 28V707-1170-E1


that was made in 1998


It was marketed under the Retailer-Brand -- [Cotter & Company - 022, 722, 723]


What I would like you to do is go to this site



And in the search box enter just the 450f part of the model number.


Find the model number above and click on it.


Examine the unit pictures and see if it is exactly the same in the way that it is designed or close enough.


If so, then the listed drive belt is what you want..



Edited by James W on 12/2/2009 at 11:45 AM EST
Expert:  James W replied 7 years ago.

Then go to the wheels and drive assembly and look at the parts breakdown. look at part 56 or 55

I think you are asking for part ref 56


If they are what you want then the parts are


Add to cart
V-Belt 1
Add to cart
V-Belt 1


You will want to order it from the web site because often they are half size or 3rd size belts and must fit exactly. MTD has enough trouble keeping them on without using 3rd party replacements.

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