Hi N1KK0 and Norm
The M36 was too tight but the M37 was too loose ,the belt you have ordered N1KK0 looks like the M37,All Mower Spares say it's 37 inches in length but when I search the part number at Gates they say it's 38 inches in length.
If I don't have the exact length of the belt that I need I usually go to an industrial belt supply company and try a few until
you get the right one then pay for it ,it's usually half the price of buying the belt from a mower shop.
https://umstrans.com.au/products/timingbelts/When I say try a few different V belts ,I just fit the belt for length ,I don't run the machine until I've paid for the right
length belt.
Another thing you can do is get an old belt that is too long but is the correct V size then cut the belt so it's the right length
then when you have the cut belt the correct length measure the belt for it's length.
You would assume the measurements for belt length are inside circumference but some listings have outside circumference.
I had a look at my 550 SP and the belt had M34 on it.
Cheers
Max.
