Need new cable that controls the speed of the self propell craftsman 6.75 model #917.377650 21" rear drive

try your local dealer. I did a craftsman for my cousin a few years back not a fun or easy task every for a skilled diyer

https://www.manualslib.com/manual/480295/Craftsman-917-374544.html

Cathy, there is a way to adjust belt tension on some models whether it is by the cable or a slotted bracket where the idler wheel is mounted, depends on make and model. If you have your manual check in it for belt adjustment. Could be stretched belt, stretched cable, worn/oil on pulley, seized tensioner, stretched/broken spring on tensioner,etc.
How to replace drive belt on Craftsman 22 Front wheel drive mower
How To Repair Troubleshoot Self Propelled Part Of Lawnmower HD
Fix Self Propelled Craftsman Push Mower
How to adjust drive belt on 6 75 Horsepower self propelled lawn mower...

Hi Robert,
I'm not usually a Lawn Mower Expert, but I think I may have an answer for you. Assuming your craftsman rotary lawn mower is similar to this self propelled craftsman mower (they should have the same basic parts), this video should help!

Self-Propelled Craftsman Lawnmower Drive Cable Repair

The self propel lever is the bottom one, the top one is the running lever. Have her check the cable coming out of that one. var geo_Partner = '1890d1e7-e721-4f9c-b474-1a19eda23e94'; var geo_isCG = true;

SearsPartsDirect.com will help with that

Cable could be stretched belt could be worn or old, if it has a gear box maybe it slipped a gear or lost some teeth. Do some investigation, Good Luck

i have a craftsman rope start lawn mower, the rope keeps snapping back on me and sometime will not come out at all. is there a way to fix this problem

Is the lever pushed up where the self propelled should be engaged? Yesterday, my wheels stopped turning. I have a break in the cable that goes to the self propelled. I will have to replace the cable.

if it is a belt driven drive check the belt for tension or break. or check the cable that engages the drive wheels.