Your issue is in the ratchet key/spring area.....
Remove the rear wheel then "E" clip #17 and washer #18, Carefully slide gear #1 off the transaxle shaft. The key and spring may drop out of the shaft so have a parts pan or something under it so not to loose them.
Clean all the oil and dirt out of the shaft slot and off the gear-spring and key, Your dealer should have known better than to use oil in this area.
Get a tube of powder graphite from your local hardware store and put a little in the shaft slot then on the spring-key and on the inside of the gear, Re-assemble and you should be good to go.
Never use any lubricant that will attract sand, All it will do is cause sticking and premature wear......
Originally Posted by piston slapper
You never learn anything until you admit you don't know it all...
Originally Posted by MannsLawnService
some times the man in my mirror isn't so smart...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!