Grinders - Recent Questions, Troubleshooting & Support

You are correct, there is no replacement for part # OR90357, but if you have the original motor, I am sure that a local electric motor repair shop will be able to repair, or replace it. I'm confident that this is your best option at this point.

There is a similar one on eBay, but no free ones. Cummins are known for diesel engines rather than grinders, which means someone else made it and put a Cummins badge on it. Take your pick from any of these. https://www.google.com/search?q=8%22+Bench+Grinder+manual They don't need much of a manual anyway, most of the content is on safety. Press switch to turn on and off, one arbor is right hand thread, the other is left hand thread. https://www.google.com/search?q=Cummins+model+c-140+bench+grinder+manual ..

It's possible that the variable speed control may be the issue with your Delta 23-197 grinder. However, before attempting to bypass it, there are a few other things you can check. First, make sure that the grinder is properly plugged in and that the power outlet is functioning correctly. Check the power cord and make sure that there are no cuts or breaks in the cord. Next, check the switch and make sure that it is properly engaged. If the switch is faulty, it may need to be replaced. You can also check the brushes on the motor to see if they are worn out or damaged. If the brushes are worn out, they will need to be replaced. If none of these troubleshooting steps resolve the issue, it may be possible to bypass the variable speed control. However, this is not recommended unless you have experience with electrical wiring and understand the risks involved. If you do decide to bypass the variable speed control, you will need to identify the wiring that controls the speed control and connect the wires together to bypass the control. However, keep in mind that this will result in the grinder running at full speed all the time and may shorten the life of the motor. It's always best to have a qualified electrician or technician perform any electrical modifications to your tools.

depends on condition and what comes with it. generally starts at $500 in good shape and up to 850 if excellent with many extras (chucks, rests, knurling attach, faceplates, etc) Also, check for accuracy...

I would replace the capacitor anyway as they are cheap. If it is the PCB, there isn't much on it, a transformer, some resistors and a component with a heat sink probably a triac. You could take that to a good electronics engineer and they could test it at component level. It must be very old, there are no parts at all. https://www.google.com/search?q=Craftsman+grinder+152.211620+parts ..

the two copper tabs under the on off switch are to break the power source.connect incoming power to one of these(black) then a short piece of wire from the other tab under switch to one of the three tabs under plate that is marked hot or l1 is probably #2 but you need to be sure. the white is the nuetral or l2 which is most likely #3 and the green is the ground most likely #4 I would definately look online for a wiring diagram to be sure if they are not marked with L1 L2 and GND

Yes all the tool places say discontinued. Yes, bypass it, but make sure you don't overwork the grinder. https://www.google.com/search?q=2610904741 ..

replace the starting cap

Out of warranty ... time for a replacement machine.I would choose a different make. Assuming the batery is not the fault.

I know this is an old post, but maybe it will help others looking for information. I have the Craftsman 1/3-HP grinder models: 397.19580 & 397.19581. They are Split-Phase single voltage (115 V), and use a Klixon start-up current style relay - 2CR14-224. The relay is normally open. When the large starting current in the main/run winding circuit is sensed by the the relay coil (term 3 & 4) which is in series with the main winding, the relay contacts close (term 2 & 4). The one end of the start-up winding is connected to the main coil's BLK wire in the coil pack. When the relay contacts close the start-up winding is energized. The start-up coil is used to provide a boost to over-come the resting inertia of the rotor. Once the rotor reaches between 65% - 75% of operating speed, the current through the main winding circuit is reduced to the point that the relay coil cannot over come the return-springs force, acting on the relay contact arm. With the contacts open, the start-up winding is no longer energized. This should take about 2-3 seconds, if the relay malfunctions, the high current through the start-up windings (thin wires) may be damaged. Here is a diagram I have made. Klixon 2CR relays are no longer available.You may find a suitable replacement here: http://www.herbach.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=HAR&Product_

DIRTY CONTACTS POSSIBLY

That is OK.

Contact Nutool directly to inquire.

Contact Power Pro Craft directly to request the wiring diagram.

Size for size and component value identical on replacement. Fit the correct part.

Considering how potentially dangerous grinding machines and wheels are and how much safety legislation exists about their maintenance, adjustment and use, a great deal of printed matter exists about these things and the wide range and selection of wheel material. You should have no bother finding useful information, fortunately bench grinders are extremely similar to each other... https://images.homedepot-static.com/catalog/pdfimages/b6/b64b39fb-6d42-4fec-a274-76bbd950e6d8.pdf

A wire wheel is bought from the same sort of supplier as you would buy a grinding wheel. The dimensions of the wire wheel should be similar to the grinding wheel it replaces, though the centre hole is usually larger and should be fitted and mounted with the correct size plastic bushes and steel retaining washers. The guard and the tool rest should not be used with a wire wheel for safety and of course there should be a hook nearby to hang a pair of safety goggles... Bear in mind, in a commercial environment, local legislation could exist that means only a suitably qualified and registered person is allowed to maintain/adjust a grinder as in the UK and Europe.

Harbor Freight customer service contact information: https://www.harborfreight.com/8-inch-bench-grinder-39798.html

Mmmm... that's a little more complicated. If you have a continuity / resistance meter, we can noodle it out, though. First, are the two white wires the ONLY wires coming from the motor? I suspect they are - that's not in conformance with any accepted color code, but it'll work. For the rest of this, I'll assume that the two white wires are the only ones from the motor. You'll need to meter the switch itself, with no wires connected to it. In the OFF position, you shouldn't find continuity between any of the four switch contacts. In the ON position, you should find continuity between two pairs of contacts. The black wire from the power cord should go to ONE of the two switch contacts in a pair that have continuity with the switch turned ON. One (either) of the white wires from the motor should go to the other switch contact IN THAT PAIR. That leaves you with one more pair that has continuity with the switch turned ON. The white wire from the power cord goes to one of those, and the second white wire from the motor goes to the other one. When you have it all wired up, plug it in & turn it on. If it's not right, it should immediately pop your circuit breaker. If it IS right, it should run fine. If it pops your circuit breaker, open it back up and swap one wire from the power cord and one wire from the motor.