Dayton 3/4hp Bench Grinder

[Twalther]

Anyone happen to know if this grinder 4z909c has a centrifugal switch?

Tom.

 

[Bob Korves]

I don't know. That said, I have never seen a bench grinder that size that does have a centrifugal start switch. Not really needed because of the low starting torque. Many grinders do have capacitors, but they are run capacitors, no cent. switch...

 

[Twalther]

I don't know. That said, I have never seen a bench grinder that size that does have a centrifugal start switch. Not really needed because of the low starting torque. Many grinders do have capacitors, but they are run capacitors, no cent. switch...

The thing is that it will start if I spin it, and it does have a cap but I was thinking it was a start cap.

Tom

 

[kd4gij]

This might help, it is what came up on grangers web site for your model #
http://www.grainger.com/ec/pdf/Dayton-Bench-Grinder-2LKR8-2LKR9-2LKT2-Replacement-Parts-List.pdf

 

[John Hasler]

The thing is that it will start if I spin it, and it does have a cap but I was thinking it was a start cap.

Tom

A capacitor run motor with a bad cap will usually get going if you spin it. It won't have full torque. What does the capacitor look like?

 

[Bob Korves]

This might help, it is what came up on grangers web site for your model #
http://www.grainger.com/ec/pdf/Dayton-Bench-Grinder-2LKR8-2LKR9-2LKT2-Replacement-Parts-List.pdf

The parts lists that kd4gij put up shows a capacitor as well as a centrifugal switch. I am guessing your grinder has a start winding operated by the centrifugal switch and that there is an issue with the switch, the winding, or a connection. I still think the capacitor is a run capacitor.

 

[Twalther]

OK guys; this grinder does not have a centrifugal start switch. I tore it down and that is OK seeing the bearings have suffered brenilling from out of balance wheels. This is just f0r you info if you have one of these. Now to find the correct capacitor for it.

 

[gwade]

I have an 8" Dayton Grinder and had to replace the capacitor after the starter circuit hung on. I bought that way at the flee market for cheap. Attached is the manual for mine that I previously downloaded. I ordered the following capacitor from eBay and it is running great.
[AC 125V 200uF 200 MFD 2 Terminals Motor Run Start Capacitor]

 

[Bob Korves]

OK, you have confirmed that the grinder does not have a start switch. In that case, yes, you likely need a new run capacitor. The files gwade posted shows start switches for all models, must not be what you have...

 

[Twalther]

The thing is that the grinder I have is a 4Z909C grinder, I have not been able to find a manual for it. I picked this up for $25 thought I would take a chance on it for that.