Grizzly 690 pulley fell off motor

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Forum topic by g_uncle posted 10-14-2013 10:47 AM 1106 views 0 times favorited 7 replies Add to Favorites Watch
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5 posts in 1932 days

10-14-2013 10:47 AM

Topic tags/keywords: grizzly 690 pulley motor repair set screw maintenance


I’m rather new here, but did use this site when purchasing my saw. I Have a Grizzly 690, purchased about 2 years ago. in general, great saw, powerful, quiet, smooth. But 2 weeks ago the pulley which powers the blade disconnected from the motor shaft. There is a key that fits between the 2 which came out, and I have since found and reinstalled. But I think there is also a set screw (likely to keep the key in).

Has anyone else had this problem, and if so, where does the set screw go?

This is a picture, where you can see the little square “key” that fits between the motor shaft and the pulley.

Thanks for any help.

7 replies so far

View deezldub's profile


14 posts in 2098 days

#1 posted 10-14-2013 11:44 AM

The set screw holes (likely more than one) are in the valleys of the pulley. Rotate the shaft and you should see the set screw holes. I found on a 1023 that really tight is necessary, tighter that I thought as they loosened after several hours of use. Since the holes in my pulley are deep enough I backed mine up with a second set screw. Adding a second short setscrew means remembering that there are two, but it solved my backout problem.

-- Steve

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 2186 days

#2 posted 10-14-2013 12:04 PM

In the valley of the pulleys. I use red loctite on the set screws. a single drop goes a long way. I would also give the pulley a wiggle. I have seen where the screws come out and the pulley gets worn.

View HorizontalMike's profile


7770 posts in 3152 days

#3 posted 10-14-2013 12:19 PM

I agree with using Loctite, though I would think “Blue” Loctite would be more than enough and would be much easier to remove if/when needed.

-- HorizontalMike -- "Woodpeckers understand..."

View Grandpa's profile


3261 posts in 2913 days

#4 posted 10-15-2013 01:32 AM

+1 on the blue Loctite. More than adequate in most cases. There is also a “bulldog” set screw that bites in and doesn’t back out easily. I have a sheave that kept coming off so I finally changed the key (straight key). I set the screw as tight as I could get it and it has stayed in place.

View g_uncle's profile


5 posts in 1932 days

#5 posted 11-01-2013 12:59 AM

Finally got around to fixing, so far so good.

Ordered a new key and set screws from Grizzly. Service was good and received the package in a few days. You need two of the set screws. There is one in the first valley and one in the third, nothing in the middle. The first picture shows the key and the set screw, I didn’t put anything next to it for scale, but the screws are a 1/2 inch long.

The second picture shows where the set screws go (from the inside). Used blue locktite and it seems pretty snug. Worth mentioning that the old set screws were still in place, and even snug at that, but seems like they lost their bite.

View HorizontalMike's profile


7770 posts in 3152 days

#6 posted 11-01-2013 01:04 AM

Interesting. Thanks for the update.

Nice to know, if it happens to me in the future,

-- HorizontalMike -- "Woodpeckers understand..."

View MarkwithaK's profile


370 posts in 3416 days

#7 posted 11-01-2013 01:34 AM

Interesting. Never seen this on a pulley but I did have a fan blade one a condensing fan motor do something very similar a few years back. Seems that the ridges on the end of the set screw were missing and it simply pushed itself off the motor shaft. Good that you got it taken care of.

-- If at first you don't succeed then maybe skydiving isn't for you.

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