Much thanks Tyler :-) Appreciate your assistance - I believe I had already been trying to go by that info but your assistance is greatly appreciated.
I'm unsure exactly how to determine exactly what 550 Pro pulley variant I have? But I am pretty sure it must be the 'standard' as when working it's anything but SLOW.
I've been down to the shed (which just gives me bad vibes at present, as well as having to walk through the crazily fast growing sloping back area along the way) - and gotten these measurements and pictures.
The rear/transmission pulley is approx 105mm in diameter (measured at the top outermost part). It appears to be in reasonable condition. The front/engine shaft pulley is about 58mm in diameter (measured at bottom/lower most point). I have checked the 3 x 550 Pro's that I have (all have PT engines on them) - and all pulleys are identical.
The pictures attached are: 1) Drive belt area opened, no belt in place 2) Rear/transmission pulley (cover off) 3) Front/engine shaft pulley
In response to Tyler's info , which as I said I believe I had already been using - as I'd downloaded the Victa parts guide for this model - so firstly the CH85666A Powerated 6736 belt is a 36"ID belt. I have a M36K and M36 rubber and they both definitely do not fit, far too tight and the tension arm can't move at all.
Next along the CH85667A belt, this is listed on the ODK store as another M36 belt - so definitely will not fit as too tight.
And finally there is the CH85678A belt, which is listed on some sites as a M37 and others as a M38.....? Alas both of which didn't work.
Anyway - don't know if perhaps I should email Victa themselves? You'd like to think this was much easier and the mowing the hard part but alas not.
PS. Have googled the rear/transmission pulley part numbers - can't get a size on any of them - so unable to confirm which one is on. It's a decent size, about 11cm, and the mower moves very quick - but if it's the standard one I can't imagine the slow one being a lot bigger.
