Most Craftsman riding mowers have an adjusting nut on the pivoting linkage. If you look on top of the deck there are two arms coming from above that raise and lower the deck. The bottom of these rods are threaded and can be adjusted right there.
Please provide the model number when asking a question like this. Different models use different techniques. Craftsman LT1200
Husqvarna
A person can get an owner's manual for a Craftsman lawn tractor by contacting the Craftsman company. The phone for customer service is 1-888-331-4569.
1997
I've had 4 Craftsman mowers. All have been right hand (standard) thread.
MTD
1997
2006
Try searspartsdirect.com
Gates
it should be under the seat.
March 01 2004