I would be interested in the sourcing information.
I just finished rebuilding the gearbox on my 430 with 60" deck. There seemed to be a lot of play in the driveline and gearbox. All that was fixed with new woodruff keys.
In doing research, I found out the 60" deck on 420, 430, and 755 all have 18 tooth input and 27 tooth output. In looking at almost all other deck gearboxes (50" and 72" on just about everything including front mowers,) they have 25 and 26 teeth respectively for about 1:1 ratio. Any ideas why only the 60" deck on these machines would have the blade speed reduced? It seems if I used a gearbox from a 50" or 72" deck I could get faster blade speed on my 60" deck.
My first thought is that the 420, 430 and 755 have about the lowest horsepower of machines using these 60" decks and maybe the thought was to not overtax the engines.
By the way, I have sourced all the parts needed to rebuild these gearboxes and will supply the info if anyone is interested.
I recently had a sheave failure and had it repaired at a local machine shop for less than the cost of a new one.
BTW, has anyone installed a tach on their 430 and would share the information. I like to have a tach on all of my engines.