Before I begin, this is a fairly involved process so if you dont have some mechanical experience you may want to pass it off.
First you have to split the snow blower so remove the bolts on the side of the case just behind the auger case.
The three bolts just to the right of the tire must come off. Then the case will split apart. Stand the engine section against a table or something.
Tip the auger section up on its end so the pulley is facing up. you must remove the pulley by loosening the set screw or bolt on the shaft. This can be very difficult due to rust.
After you get the pulley off you will need to remove the auger assembly from the casing. You will first remove the bolts/nuts that hold the ends of the auger shaft to the side of the case. When those are off you will pull the auger shaft/gear case assembly out of the case. It will look something like this...
Once that is out, you will be able to get to the impeller bolts or pins. If you have bolts simply remove the bolts and slide the impeller off the shaft. Again, this may be difficult due to rust and/or wearing of the shaft under the impeller. If you have pins, the pins will have to be pushed through with a hammer and drift pin smaller than the pins themselves. Then you can purchase new pins. These can be purchased at a local hardware store.
Once you replace the pins, put the machine back together.
Additional Information from Peter BateI have discovered that the Auger is in fact Model KAAZ DZ500. There seems to be a sub model number: GD490A (Engine 1E44F-5) or GD490B (Engine 1E44F-6) The main difference would appear to be the 1E44F-5 is a diaphragm type carburetter while the 1E44F-6 is a float bowl type carbruetter. I don't know how to distinguish. best regards Peter Bate
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