Need help with 2750A snowblower

[joeyt]

The upper chain sprocket key came out, and the sprocket is now riding freely on the driveshaft. Does the sprocket need to be tightened down in a specific spot on the driveshaft? The parts schematic seems to show a hole or indent in the driveshaft that looks like it lines up with one of the set screws. Is there a procedure for positioning the sprocket and set screws in the proper location? thanks for any help (even a picture of your chain would be helpful)!

 

[DustyRusty]

The key locates the sprocket to the shaft. Usually, when there are two set screws, they will "dig" into the shaft to keep the sprocket secured to the shaft. I suggest that you use a medium-grade Locktite to secure the set screws. You also should have a way of getting some leverage on the set screws, such as a T handle Allen wrench. I use an Allen wrench that I can attach to my ratchet. It must be tight if you don't want it to slip again. That is the reason that the key fell out, the set screws were not tightened enough.

 

[joeyt]

The key locates the sprocket to the shaft. Usually, when there are two set screws, they will "dig" into the shaft to keep the sprocket secured to the shaft. I suggest that you use a medium-grade Locktite to secure the set screws. You also should have a way of getting some leverage on the set screws, such as a T handle Allen wrench. I use an Allen wrench that I can attach to my ratchet. It must be tight if you don't want it to slip again. That is the reason that the key fell out, the set screws were not tightened enough.

Thanks very much!!! There's an inch or so of driveshaft that the sprocket can be tightened down to. Is there a specific spot that's required, or just eyeball it so the upper and lower sprockets are in the same plane? And there's no specific spot on the driveshaft that the set screw tightens against? (again, I was confused by the parts schematic that looks like the driveshaft has a matching hole or indent.) thanks again!

 

[DustyRusty]

The 2 sprockets must be perfectly in alignment or you will have chain problems. I would use a 2' carpenters level to place against the face of the 2 sprockets and make sure that they are in alignment. You will need to find the master link in the chain, and disconnect it to do this. Once you have the sprockets aligned and tightened, run the chain around the bottom sprocket and bring the two ends up to the top at 12 o'clock. This will make it easier to put the master link back on the chain. While the chain is off, you can wash it in kerosene or diesel fuel, and then relubricate it with chain bar oil. If you really want to get exotic, you can use Lucas motorcycle lubrication on your chain. I haven't tried this yet, but I figured that if a motorcycle chain is exposed, and it can go thousands of miles with motorcycle chain lubricant on it, then why should a snowblower chain? It will be interesting to hear others' thoughts on this chain ideal.