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Re: Old Rotohoe tiller 990-5


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Posted by Hal/Eastern WA on March 31, 2012 at 23:29:57 from (67.5.111.7):

In Reply to: Re: Old Rotohoe tiller 990-5 posted by 36 coupe on March 31, 2012 at 15:03:02:

I bought one in about 1977 with an 8hp Tecumseh. That engine lasted a few years and then sent the rod through the side of the block. I bought an externally identical 10hp engine, but the output shaft was larger than the 8hp, so the original pulley would not work. Since one of the main problems I had with the original setup was that in heavy tilling, I could wear out a new drive belt in an afternoon, I decided to put on a larger pulley. I got the smallest 2 piece pulley I could find that would fit and added the proper sized belt.

It worked OK, but I would not say good. With the larger engine pulley, the tines turned quite a bit faster. This was OK most of the time, but I found that if I hit a small rock just right, the tiller would shoot the rock out the back with dangerous force. I had to make some shin guards out of plastic sewer pipe to safely till my garden. At least I didn"t have to buy a new belt so often. I also got the snow thrower attachment, and it would sure toss snow a long way.

I thought it was poor engineering to have used so small of a primary drive belt and also to use such a small diameter engine pulley. What they should have done was to increase the size of both the engine pulley and the pulley it drove. That original setup would smoke a primary belt really fast. Maybe they engineered it as they did so the primary belt would slip fairly easily if it encountered anything tough, rather than breaking something else. I never had any trouble with the rest of the machine. I would not say that it was easy to till with it though.

I now have a repowered Troy-Bilt. It is a lot easier to use than the Roto-Hoe. But then, when both were new, the Troy cost about twice as much as the Roto-Hoe. Good luck!


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