Can’t disassemble Delta Tablesaw Motor
ajcrm125
| Posted in Power Tools and Machinery on
I have an old Delta 34-670 table saw that is need of a motor tuneup (bearings in particular). Trying to disassemble this thing is just a nightmare.
The pulley is pressed on and the clearance is so small that I can’t get my nice large gear puller on it. Had to try a smaller one from an auto store.
This thing just won’t budge. I even tried putting the torch to it to see I can get it to expand a little. No luck. In fact every crank just bends the puller more and more.
Am I missing something here or is this just typical for this style motor? (Delta 1313314)
Thanks!
-Adam
Replies
Sorry Adam;
I've had some stubborn bearings but if the torch doesn't do it I don’t know what will. I've never bent a puller - maybe a heavier puller?
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The picture of the pulley (see attached) shows two threaded holes. There are special pullers that grab bolts you thread into these holes.
Does your pulley have these holes?
Nope. 🙁 Unfortunately my pulley doesn't have those holes. Wonder if they were added in a later version.
Try freezing, then pulling ?
This may be silly, but surely you released the set screw that jams against the pulley key? Just a thought.
One possibility is to take an old socket which fits over the arbor, place it against the pulley and give it a couple sharp shocks with a hammer. If this does not break it free, try penetrating oil, like nut buster (or better yet "Kroil"). Let the treatment sit for 1-2 days to really soak in. Then go back to some judicious shocks. If that does not work, keep reading.
I once tried to pull off a badly stuck pully and it broke in the puller, dang! So, I took a hammer and punch to it and took it off in pieces. Fortunately it was a standard pully so I was able to find and fit a replacement. So, before you try this method be sure you can get a precise replacement. Most pulleys are cast and break up pretty easily. Some sources (like Inline Industries) offer machined pullies which are more precise - these will likely not break easily.
Then I cleaned up the arbor (mine was rusty) of all debris using a fine wire brush followed by a polish with 600 grid paper. My key was still in good shape so I reused it, but keys are pretty easy to find on the web.
When ordering a new pully be sure to measure the diameter outside and inside where the belt rests, along with the arbor diameter and the key size in order to find an exact replacement.
While I was in the process, I ordered a link-belt for the saw which many recommend and did seem to make it run much smoother. I also order a set of PALS (also InLine Industries) which made aligning the arbor a much nicer job.
Good luck
Check thoroughly for set screws. I have seen some that are set down in between the "V" where the belt runs. If you have removed or loosened a set screw, check to see if there is another one under it. Sometimes there are two in the same hole to lock them in place.
Try drilling some holes in the existing pulley. Put some bolts in with nuts on the back side. Attach the puller to the bolts. If this ruins the pulley, so what? They are not real expensive.
Also, as you are putting pressure with the puller, tap on the Screw that is putting pressure on the end of the shaft with a hammer. Use some discretion. Damage is possible, of course.
" If this ruins the pulley, so what? They are not real expensive."
Yeah I was contemplating just grinding it off but I haven't been able to find a replacement pulley anywhere for this thing.
I can't imagine that it would be anything unusual. As you probably know, there will be three main dimensions, shaft size, diameter, and width of "V". Beyond that, there are several types of shaft mounts and the material it is made of. Try: https://www.mcmaster.com/Pulleys/
The bearings in my hand saws never wear out; they just get shaky after a few too many the night before.
I have the same saw, have had it for years. (40 or more) I replaced the bearings, and belt, twice. ( ripped the the cogs off the belt the last time), I decided to just purchase a new, complete motor assembly. (was still available 15+ years ago).
The new one, was NOT belt driven but was a gear driven. NO problems since then!!!!!
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