How do you change the large belt on the John Deere Scott Mower with a 54" deck?

Hi,
I will assume that you mean the secondary (blade-to-blade) belt, so:
Peace,
Clarke

Hi,
Happened to notice yesterday that the manual is available from Deere through OwnerIQ: Product user manuals, help, forums tips and tutorials. through a link. Sign-up may be required, but is free.
From the dropdown lists choose the following. First choose Lawn & Garden, then use the "S" to go to Scotts, choose Lawn Mower and finally pick the S2048 and S2554 link. In a few moments it will give you the chance to "Get This Manual."
Peace,
Clarke

Scotts/deere riding lawn mower won't start kohler cv491s 17.5 eng, good fuel, +spark. I have removed and spray cleaned carb, removed rubber plunger head from carb fuel solenoid, put clean gas through all lines, and fuel is pumping up to the carb fine, engine turns - no effect, if I put gas in air intake engine backfires, I think fuel is getting to cylander, because of occasional backfire when turning over, and if choke is pushed to full it will occasionaly backfire, if starter fluid sprayed in air intake w/ filter off etc, backfires and flash of flame out air intake, can anyone help? I read another persons answer, and wonder if I need to be looking at the "flywheel key" any ideas how would I do that?

What is the drive belt configuration on the s1642 mower?

I have a 1985 john deere 160 riding mower, the blades will engage when the mower is cold but when it warms up the blades will not engage. I replaced the ignition switch and the blade engage switch but this did not help. Does anybody know what I should try next?