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I just restored my bench grinder {Dayton 1988 bench grinder,4Z909A model / 3/4hp. i need a wiring diagram with start capacitor

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: switch and capacitor crapped out on 1/2 hp Sears bench grinder

Replacement should be simple. Just do a one for one hookup with the new part, after you unplug it first.
For a diagram go to;

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=397.1949&productCategoryId=0721000&brandId=0247&modelName=CRAFTSMAN-1%2F2-H.P.-GRINDER&diagramPageId=00001&documentId=00023041&pop=flush

Posted on Mar 28, 2009

  • 5603 Answers

SOURCE: bench grinder, 110/220?? wired up properly

LIKELY the capacitor which is usually in the base is bad.

The capacitor shifts the phase angle in one of the two windings which creates a pseudo rotating field to start rotation.

Posted on Nov 16, 2009

  • 172 Answers

SOURCE: Need part numbers to replace eyeshields on Dayton bench grinder

Your grinder is listed on page 3085 of the Grainger catalogue. The part number for the eyeshield is 00281.00 and the number for the lower eyeshield bracket is 00280.00. The right hand upper eyeshield bracket is number 25188.00 and the upper left hand bracket number is 25177.00. All of this can be ordered through Grainger at 1-800-323-0620. Marvin T.

Posted on Jan 13, 2010

Testimonial: "This was very helpful. I have ordered parts from Grainger. Thank You."

rowdy45176
  • 2176 Answers

SOURCE: I am looking for a Dayton Bench Grinder Manual

I would try and call Grainger parts to see if they have one. I know they deal with and sell Dayton equiptment. If no luck let me know and I will try and find another source.

Posted on Mar 25, 2010

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1 Answer

Could sure use a wiring diagram for a Dayton 5k961c motor.


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Jan 23, 2016 | Dayton Dryers

1 Answer

Is the 4A912B Dayton 10" 1 HP bench grinder 3 phase or 1 phase?


If the plug on the cord has 2 flat prongs and one round one then its 110 VAC single phase. If the motor has 4 wires then I'd suspect 3 phase. The data plate on the motor will tell you for sure.

Nov 19, 2014 | Bench Grinders

1 Answer

I have a 1022w bench grinder with a missing capacitor. The baldor catalog doesn't list the part number or spec for the cap. Nor is there a wiring diagram that shows the connections to the cap. Anyone...


OC3012F12SPCYL OIL CAP 12MFD/370V
Thats number the neccesary part for your grinder 12 mfd think about a fitting size of the capacitor and model if you will know for sure here is the information to get .

http://www.baldor.com/brands/baldor-dodge/contact-us/contact


https://www.baldorvip.com/servlet/productInfoPacket/1022W.pdf

Jun 15, 2017 | Baldor 1022w 10" Bench Grinder, 1 Hp,...

1 Answer

I have a 1/3 hp motor with a capacitor. There are four motor leads coming out of motor, the capacitor is mounted in the wiring box. This motor does not have a centrifugal switch, to isolate the capacitor...


I am in the process of replacing a capacitor on a Craftsman 6 in 1/3 grinder, 2.8 amp, single phase, 110v. Not sure on the centrifugal switch. model 319.190621, ser B9530. When I took the old one out the black wire from the capacitor went to the cluster of back wires (in my case 3) in the wire nut. The blue wire from the grinder went to red wire from the capacitor in a wire nut. Hope that helps you....

Maybe you can help me... the specs on the capacitor burned off when it failed. Can you tell me what the capacitor specs are on yours?

Nov 16, 2010 | Craftsman 6" Bench Grinder with Lamp

1 Answer

I am looking for a Dayton Bench Grinder Manual...more specifically a parts breakout. Dayton Bench Grinder Model 1Z707W. Thanks, Mike


I would try and call Grainger parts to see if they have one. I know they deal with and sell Dayton equiptment. If no luck let me know and I will try and find another source.

Feb 16, 2010 | Grinders

1 Answer

Need part numbers to replace eyeshields on Dayton bench grinder


Your grinder is listed on page 3085 of the Grainger catalogue. The part number for the eyeshield is 00281.00 and the number for the lower eyeshield bracket is 00280.00. The right hand upper eyeshield bracket is number 25188.00 and the upper left hand bracket number is 25177.00. All of this can be ordered through Grainger at 1-800-323-0620. Marvin T.

Jan 13, 2010 | Grinders

1 Answer

Bench grinder, 110/220?? wired up properly according to diagram on grinder, just turns on as soon as it's plugged in but it just humms, it does not spin the grinding wheel.it is a monster w/ a 3/4 hp...


LIKELY the capacitor which is usually in the base is bad.

The capacitor shifts the phase angle in one of the two windings which creates a pseudo rotating field to start rotation.

Nov 07, 2009 | Saws

2 Answers

Older sears bench grinder wont run 1/3 hp model 397 19581


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.
older-sears-bench-grinder-wont-run-1-3-z1zi3msqm0xxzvze3v341n5r-4-0.jpg

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_

May 31, 2009 | Craftsman 6" Bench Grinder with Lamp

1 Answer

Older sears bench grinder wont run 1/3 hp model 397 19581


Hi again, OK, Well since I don't have a wiring diagram and the colors don't help. I am also going to assume it is 110VAC. The larger wires are probably the run or primary, it you remember which ones were connected it will help with polarizing. ( getting it to run in the right direction as well as the start and primary working together). You can use the two terminal switch but you should use a three wire cord. Use the switch to break the neutral and ground the case. The connections should be as follows: Connection 1, would have one of the primaries and one of the starts to neutral. Connection 2, the other start to the relay. Connection 3, the coil side of the relay to the remaining primary. ( if the relay has two connections on one end and one on the other it would be the single) Connection 4, the 3rd position on the relay to hot. That is how a split phase is wired. You may find a simple wiring diagram on the net if you type split phase motor wiring diagram. Good Luck to you, this should Fixya!

Mar 04, 2009 | Grinders

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