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Unisaw 34-802 pulley adjustment

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Forum topic by mgmine posted 04-08-2015 03:21 AM 998 views 0 times favorited 7 replies Add to Favorites Watch
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mgmine

6 posts in 618 days


04-08-2015 03:21 AM

When I tried to raise the blade on the Unisaw I realized that the pulley must have shifted and is now hanging over the motor shaft. I can see the set screws but I doubt that I can access them. Does anyone know how I should go about moving the pulley back in place and aligning it?


7 replies so far

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MrUnix

4234 posts in 1665 days


#1 posted 04-08-2015 03:37 AM

Post a picture… can’t really tell what you are talking about it ‘hanging over the motor shaft’ (that’s what it should be doing!!!). Regardless, you are going to have to get to the set screws somehow if you want to move the pulley – and the easiest way is to take the table off.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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bigblockyeti

3668 posts in 1187 days


#2 posted 04-08-2015 04:49 AM

+1 to needing a picture. If you need to access the set screws you will first have to remove the belts and get to the motor from the bottom right after removing the motor cover, if you have one installed.

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MrUnix

4234 posts in 1665 days


#3 posted 04-08-2015 04:59 AM

If you need to access the set screws you will first have to remove the belts and get to the motor from the bottom right after removing the motor cover, if you have one installed.

- bigblockyeti

Man, you must be able to contort your body way more than me!! I would break something on my body if I tried to do that from underneath, either through the dust door or motor access hole :)

Cheers,
Brad

PS: Maybe I’m just getting too old – it’s sooooo much easier to do it from above!

-- Brad in FL - To be old and wise, you must first be young and stupid

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mgmine

6 posts in 618 days


#4 posted 04-08-2015 07:26 PM

Here is a picture. The pulley is hitting the bar that raises the blade which is stopping it from going all the way up. The second picture shows the pulley not completely on the motor arbor.Maybe I am missing something else that needs to be adjusted and not the pulley.
A

s an aside here is a link to a web site with a manual for the Unisaw and how to change the belt.
http://media.ptg-online.com/media/dm/OwnersManuals/20050620134744_En422-04-651-0064-06-20-05.pdf

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MrUnix

4234 posts in 1665 days


#5 posted 04-08-2015 09:26 PM

Well that ain’t good!

I guess you could just remove the belts, tap the pulley back over and re-tighten the set screws… but I’m not sure that is the way I would go about it – as it might be a bit difficult to properly align that way, and might not even be the correct alignment.

The pulley on the motor is supposed to be in a specific location. The manual you link to doesn’t show it (I guess it assumes that the saw was shipped already setup), but in older manuals it shows how to set the pulley and install the motor. Once installed, you then need to make sure the arbor pulley is aligned with the motor pulley. It says:

The motor pulley should be positioned on the motor shaft so that the outer face of the pulley is approximately 3-3/4 inches (3.75”) from the top of the ear on the motor frame as shown in Figure 3:


.

If it were me, I’d pull the top to do it. It makes it really easy to get to everything and would also give you the opportunity to blow/vacuum out all that accumulated saw dust and other gunk, clean things up a bit and lubricate stuff that needs it. Also, if you need to readjust the arbor pulley after getting the motor pulley in it’s proper location, you can only do that from above. I guess if your arbor pulley is in the right place, you wouldn’t really need to do all of that… but it is a good opportunity (or excuse depending on how you look at it :) to clean things up, ensure everything is aligned properly and perform some normal maintenance so it is back to running like new. YMMV

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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mgmine

6 posts in 618 days


#6 posted 04-08-2015 09:38 PM

Well if is agreed that the pulley is the culprit then I guess I have some work yo do. I have no idea what happened after all these years.

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MrUnix

4234 posts in 1665 days


#7 posted 04-08-2015 09:41 PM

Well if is agreed that the pulley is the culprit then I guess I have some work yo do. I have no idea what happened after all these years.

- mgmine

Might be something else… can’t really tell without looking at the machine in person or better pictures. Measure the pulley distance from the mounting tab and see if it’s correct. If it is, then you might have bigger problems. But it does look like it’s just the pulley… the shaft should be flush or slightly protruding on the pulley, not recessed like that IIRC.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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