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The Topi Motorshovel was built in Finland in the 1980's. Every towable digger manufacturer had their own unique selling point and the Topi claimed to be the smallest car towable machine that could slew through 360 degrees.
It weighed about 550kg and could be towed behind any car. The Topi had better reach than a lot of its competitors and could dig down to a maximum depth of 8 feet 3 inches. The brochure also states that the machine has a hoist capacity of 660 pounds at 5 feet. Certainly in the picture above it is picking up a pretty heavy looking stone.
The Topi doesn't have a hydraulically operated rear stabiliser. This avoided the need for an expensive rotary coupling. All of the hydraulics are mounted on the upper part of the digger with a simple slew post welded to the base part and presumably some sort of slew ring with teeth. Controls are via two levers with no need for a further lever as there is no stabiliser.
You can view a PDF of the sales brochure by clicking here
Bill's machine was bought at an auction in Fla way back. He bought it around 1988 and has had it since. He says, "it is incredible and I am just changing the Honda motor now. It's made me $$$ and saved my back many times. It will go anywhere. I can go across a lawn without making any marks and tow it behind a VW Rabbit". Bill would really like to get another Topi if anyone knows of one for sale. He is located in Massachusetts.
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Thanks to Wayne and Bill for the pictures and information for this page.