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

First off I am new to the site, and I have enjoyed reading the different posts. This site looked like I could get the most help for my aging snowblower. I have an  Ariens 924016 with the 8hp snowking, and 32 inch cut. My impeller pulley was destroyed while changing the impeller gearbox seals. I originally had a 9 in dia. impeller pulley and a 2.75 in diameter engine pulley. I have a 8in on the shelf. I am concerned if the cast iron gearbox will be able to handle to increased speed. With the 9 in pulley I have a ratio of 3.27/1 and with the new setup the ratio is 2.90/1. Has anyone done this, and if so has the gearbox held up? Any suggestions would be welcomed.

Going from a 9" to an 8" will give you approx. an 11% increase in impeller shaft speed.   I can't say for sure that you're gear box will fail or not but I'd be willing to give it a shot.  The cast iron gear case on the older Ariens machines were pretty stout and I'd bet that they're stronger than many units today.   As previously mentioned, you will lose torque.  You may have to slow down your drive into deeper snow in order to keep the engine in it's power band to keep it from bogging.  You can also take smaller cuts to reduce overall engine load.  If the 8" is all you have, go for it.       

Thank you for the info. I havent put the gearbox together yet, But when I do, I will base that decision on the condition of the brass gear shaft etc. I will also take into account that the 8hp motor does have some age to it. I also have the  clarence kit for my impeller. Would adding this kit have a better or worse effect with the smaller pulley. More leverage less torque kinda thing?

John

The impeller kit will add load to the engine.  By eliminating clearance between the impeller and housing, it will not allow for much slippage therefore the engine will taxed a bit more.  However, it will also move snow better provided it can make enough power to keep it from bogging down.

JohnDahl wrote:
JD,

Don't worry about the gearbox, it'll be fine. However, your auger brake will not function with a 8" pulley as-is, which will make the unit dangerous (your auger won't stop when you de-clutch). You could try to modify it, but I wouldn't recommend it. And as other have indicated, you'll be loading up the engine more and possibly recirculating more snow (faster isn't always better).

PK