Small Engines (Lawn Mowers, etc.): snowerblower, drive pulley, pully

Question
hi i have a allis  chammer snow blower old one, m number 2029971 ser 1036 it has 3 forward and one rev ,it say on the gear shift release touch o matic control control  befour shifting, are they taliking about the other handle on handle bar  the work the drive wheel if so went i try to put in gear it will grind like it can ,t go in , i notice the 8 inch pully that run of the gear box is turn ing  i not touching the handle, the belt is a small 3/8   the go from this gear motor to engine with a 8 inch pully from gear box and 2 small pully one pully move  to tightin belt, ,how can this problen be soveled thank mike ps  if you like i can sent you a picture

Answer
With the drive system released you should be able to shift the snowblower.  The drive pulley generally turns all the time but the belt should have an ilder pulley that tightens the belt when you engage the drive system.  Do you have a digital camera and some method to send me some pictures of the drive system?
Let me know.
Eric