Yard machine 5 h.p,rear tine tiller chain wont turn

SOURCE: Yard Machines/Tiller

the tines are usually connected with shear bolts designed to break away when u hit something as a safety precaution so that u dont break anything in the transmission. its common that people dont know this and replace them with normal bolts. if this was done and the tines are not moving now chances are uve got a snapped gear shaft

SOURCE: need manual for mtd 5 horse rear tine tiller model

If you go to Sears.com, then go to parts,then type in the model number, then look to the right and scroll down slow you will see a spot that says get manuals for this model and click on view manuals then any manuals they have you can print them out.

SOURCE: I have a 1996-1998 MTD

http://www.outdoordistributors.com/MTD/MTD_Main.html
click this link directly
Customer Service Phone Center Hours
are from 8:00 To 4:00 Mon. thru Fri.
(Central Time)
Click Here To See "US"
If You Are Ready To Order,
And Need Assistance, Please Call:
Toll Free 1-877-70-PARTS
(Orders Only Please)

If You Are Not Ordering
But Need Information Please Call:
1-205-669-2500
More Contact Information
Click Here

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one more good link for ordering parts
http://www.milacalawn.com/parts.asp

SOURCE: Yardman Rear Tine Tiller tines won't turn. Belt

The problem lies in the shift lever in the gearbox. A poor initial design that was upgraded twice. The shift fork arms have spread enough for pins to come out of the groove they run in when the tiller is shifted to the last position. (Bending back into position would only be a temporary fix as would not be any stronger.) To replace shift lever, the gearbox cover has to be opened. Seperating the cover can be somewhat challenging. When prying cover apart try to not damage the cover gasket. Gearbox grease is very thick, so gasket's real purpose is to keep water and contaminants out. Leave all gearing and chains in place. The shift lever part number is 618-0245B. Or use assembly kit number 753-0869 (contains shift lever 618-0245B, position indicator, and roll pin.) Part will run in the $56-$68 range and can be found through MTD as well as Cub Cadet. Also can get through Sears PartsDirect.

SOURCE: mtd rear tines tiller won't engage tines. F and R

I had similar problem recently with 2007 Huskee MTD series 410. The shift assembly bent and couldn't move the clutch collar all the way over on the drive shaft.