Check the manual it shows a diagram of the belt routing. If you don't have your manual you can get it here: http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0805481.pdf
Gates
The drive belt is a Craftsman #140294 The deck belts are Craftman #'s 180808 & 174368
You can go to www.searspartsdirect.com and put your model number in the box on the right side of the screen. It will give you a listing for you mower and a parts breakdown with pictures. Try the link and choose the EHP decks.
1980
There could be anywhere from 2 to 6 depending on the model of the mower.
917.276360
make a drawing of how the old one is on it before replacing it,
I have a Craftsman DYS 4500 and there is a nut under the left rear fender next to the tire that adjusts level. I'm still having trouble getting the deck tuned again despite my best effort with a bubble level, but that nut is definitely adjusted it.
You can get a basic idea by the picture see the link below:
917.249740 is not the mower's model number. It is the model # for your grass catcher assembly.
I just relaced the same belt on the same model number tractor yesterday and it was an 88"x1/2".
call sears give them your model number they will look it up for youIt is a Craftsman belt #144959 which appears to be 1/2" X 95 1/2"