Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

My problem is a blown auger gearbox on a Toro 521 (Model38052, SerNo 9004210). I haven't come up with a reasonably priced replacement for the gearbox but someone offered to sell me his Toro 724 (Model: 31677, SerNo: 600725) that has a blown motor. The auger gearbox castings look identical but the shafts and bearings are not.... SO, Any chance a Toro 521 (HS50-67259H) motor would fit onto a Toro 724 (H70-130176C) snowblower? I have taken a close look at schematics of the two units and think it may work but I can't find a dimensional print to confirm it. I don't want to buy the unit only to find out it doesn't fit. Thanks for your insights

The 31677 was one of two versions.  One with an H70 and the other with an HS50, 31625. 

 

They both use the same pulley part number so the crank diameters are the same.  Probably ¾.

 

They both mounted to the same part number base standoff plate.

 

The HS50 they used had a base block plate cast into the engine block.  The H70 did not.  A plate was screwed into the bottom of the H70 block to take the place of the cast section in the HS50 base.  Your engine has the same cast base as the HS50 they used..

 

You engine should bolt on with no problem. 

It will work. I have a 524 with a 724 engine mounted on it, no mods. The original engine was the same as the one on the 521.