Snowblowers use a high-speed impeller that both moves the snow into the machine and then throws it out of the discharge chute. A snowmobile impeller typically has two or more curved plastic paddles. The snowblower paddles move snow towards the middle of the machine and into the discharge chute.
Single stage impellers are usually made of rubber or some type of hard plastic that wears width-wise with use. Wear results over time from friction on the paddles against the ground or snow during operation. Properly function snowmobile paddles will make your snowblower feel nearly self-propelling. When the paddles are worn, you will have to push the machine as the machine has less contact with the ground. This is a sure sign that your paddles are in need of replacement.
Two-stage snowmobile impellers do not wear as quickly as single stage impellers. This is because impellers are made of metal and deeper in the machine. The snowmobile paddles also do not contact the ground in two-stage units.
Snowmobile paddles should be checked several times during the season and then after the season for wear. Once the paddles have worn more than ½ inch, it is a good idea to replace them. You may also be able to tell your paddles are in need of replacement when your snowblower is not throwing snow as far as it used to.
To replace snowmobile paddles, typically all that is required is the unfastening of a couple bolts from the auger and bars inside your snowblower. You can then remove the paddles and screw in the new paddles. Replacing snowmobile paddles can save you a lot of money in the long run. Failure to replace them can result in costly repairs to your machine.