PM 66 - Arbor Nut Issues

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Forum topic by Fiddy posted 06-20-2017 06:50 PM 938 views 0 times favorited 9 replies Add to Favorites Watch
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230 posts in 2319 days

06-20-2017 06:50 PM

Not sure how to state clearly so I took a video. Briefly put, arbor nut will not release. Came off ever so slightly, just enough for blade to spin free, however, I can’t get it to go anywhere further. When I spin the nut the entire arbor spins and the nut doesn’t loosen. I have no flats on the arbor itself and I’m feeling stumped here. Here’s a link to a quick video I took on my phone. Was difficult to hold phone, wrench and a piece of wood – but I believe you can see what I’m running into here.

9 replies so far

View DDWW's profile


127 posts in 1634 days

#1 posted 06-20-2017 08:12 PM

There could be a shard of metal or wood wedged in the threads. I’ve also known pine sap to build up and act like glue. Your saw seems clean so not likely sap.

The challenge is that the Arbor is spinning so your not getting any torque to move past what is binding the nut. Look for a way to immobilize the arbor first. Unisons have two flats on the arbor for a second wrench, but I don’t think PM66 have that. There maybe a way to do that lock it from below.

Here are a couple of things I’d try. If you have a small torch i’d try heating just the nut to see if it will expand and dislodge.

The other thing I’d try is to flood it w some penetrating lubricant at night let it sit re apply in the morning and see if you can loosen it up. Maybe try vibrating the nut with an orbital sander if you have one.

Finally If the arbor is spinning and feels good, its better not to damage that. I’d buy a new nut and try a splitter to break the stuck nut and leave the arbor undamaged.

View jerryminer's profile


961 posts in 2449 days

#2 posted 06-20-2017 08:24 PM

There’s got to be a way to immobilize the arbor shaft. Maybe just clamping the belts, or putting a strap wrench on the pulley. Worst case, you could pull the pulley and use a wrench on the woodruff key.

-- Jerry, making sawdust professionally since 1976

View Nubsnstubs's profile


1768 posts in 2738 days

#3 posted 06-20-2017 09:13 PM

Check the end of the shaft to see if it will accept an Allen wrench….... Jerry (in Tucson)

-- Jerry (in Tucson)

View 000's profile


2859 posts in 1907 days

#4 posted 06-20-2017 09:36 PM

The opposite end of the arbor shaft on my PM68 has to flat spots that can take a wrench, check yours.

View Fiddy's profile


230 posts in 2319 days

#5 posted 06-20-2017 10:02 PM

I ended up just putting a miter on the stick I was attempting to hold the blade with and jammed it into the opposite side as a wedge. That allowed me to stabilize it to get the nut off. Still not sure what’s up though. Usually those nuts freely spin off so easily and this one was not that way. There appears to be some build up in the grooves so I’m going to clean up with some blaster and a wire brush before reinstalling.

View Lee's profile


153 posts in 1886 days

#6 posted 06-20-2017 10:44 PM

Yep, that’s the culprit, gunk in the threads. Have to clean mine with a tooth brush I keep handy every so often, don’t forget to clean the nut too.

-- Colombia Custom Woodworking

View Fiddy's profile


230 posts in 2319 days

#7 posted 06-21-2017 01:04 AM

Yep, that s the culprit, gunk in the threads. Have to clean mine with a tooth brush I keep handy every so often, don t forget to clean the nut too.

- Lee

Definitely was, Lee – cleaned out and soaked the nut in some blaster. The nut was actually the real issue like you mentioned. Cleaned a couple times and now goes on and off like it should. Thanks for the advice guys.

View JBrow's profile


1368 posts in 1928 days

#8 posted 06-21-2017 03:03 PM


While you are under the hood of your new PM 66 table saw, I thought I would mention a zerk fitting I found only incidentally. The fitting accepts grease from below and is found on the arbor side of and near the motor. Since I discovered fitting, I periodically squirt a little grease into that fitting. I assume some bearings (arbor?) are the beneficiary of grease sent through the fitting I but really do not know.

Since the zerk fitting is not apparent nor mentioned in the manual, it may never have seen grease. This is the only grease fitting I have found on the saw.

View Fiddy's profile


230 posts in 2319 days

#9 posted 06-21-2017 03:56 PM


Thank you for heads up on that – I’ll definitely be hitting that up this evening. Thanks, bud!

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