156428-R MK 370 Replacement Ryobi Motor

SKU: 156428-R
Manufacturer: MK Diamond
MPN: 156428-R





MK Tile Saw Replacement Ryobi Motor


  • 1-1/4 hp, 7.4 Amps, 6000 Rpm
  • Blade Capacity 7" (178mm), Arbor Size 5/8" (16mm)
  • Powerful high-torque motor
  • Maintenance-free, self-lubricating pinion and gear-box assembly
  • Heavy duty on/off switch
  • MK-Safe switch prevents saw from being operated when locking key is removed
  • Replacement motors for MK 770's built prior to 2005 have been discontinued. p/n:153804

Compatible with the following models

  • MK-270
  • MK-370
  • MK-370EXP
  • MK-770 (2005 and newer)
  • MK-770EXP tile saws

Questions & Answers (10)

7/8/2015 3:48:32 am

After installing this motor, the blade is misaligned from the groove on the cutting table by about a 1/4". Any idea why? All i did was change out the motor and replaced with old blade. I found out when I tried to do a 45 degree cut and the blade hits the table out of the groove by about a quarter inch

It may be that the inner flange is not fully seated on the blade shaft. Please send a picture to orders@contractorsdirect.com and we will see if we can diagnose the problem.

12/2/2015 8:37:40 pm

My motor for my Mk 770 tile saw works although the gears seem to be worn out and slip. Are there replacement parts available?

The complete MK Motor for MK-270, MK-370, 470, 370EXP, 770, 770EXP tile saws must be purchased. Parts for the motor are not available.

12/12/2016 5:15:14 pm

i bought this motor back in march and the motor is locked up sounded like the gear inside broke is there a warranty

Thank you for contacting Contractors Direct.
We are sorry to hear about the issue with your motor. Due to the time elapsed, warranty claims must be submitted to manufacturer directly. Please contact MK Diamond at 1-800-421-5830.

2/12/2017 2:57:58 pm

I bought this for my son for his mk-770. The original saw is held in place by bolts that attach to the motor itself. There are no bolt holes in this motor. Is there some additional part that is required to fit this motor to the frame.


Thank you for contacting Contractors Direct. The bolt holes are located around the blade shaft of this model.

This motor can only fit on MK 770s produced in 2005 or later.

5/27/2017 12:17:38 pm

My mk 470 motor don't come on just stopped .Do i need new motor or how can i fix this?


Thank you for contacting Contractors Direct. When was this motor purchased ? We recommend to contact MK Diamond, the manufacturer, at 1-800-421-5830 to begin a warranty claim if the motor was purchased within the last 12 months.

Let us know if you have any other questions or concerns.

11/10/2017 12:15:54 pm

I need to replace the brushes on my MK470, how do I access them?

Please contact MK for technical support. 800-tile-saw (800-421-5830)

8/6/2018 4:00:07 pm

Will this motor fit the Workforce THD850 tile saw, model number 95031240

This motor is listed to be compatible with the MK-370, MK-370EXP, MK-770 (2005 and newer), and the MK-770EXP. Any compatibility outside of the above listed saws is not recommended.

12/3/2018 12:35:47 pm

I have a WorkForce THD850 tile saw. Will a MK 370 motor fit this unit?

That appears to be a QEP saw and it would be best to speak with them to either confirm what replacement motor will fit your saw. The phone number for QEP is 866-435-8665

12/31/2018 1:29:58 am

Tengo corto circuito en mi motor mk 470 puede repararlo o nesecito motor nuevo gracias

Por favor, póngase en contacto con MK al 800-421-5830. Ellos podrán confirmar si necesita una reparación o un motor nuevo.

5/25/2019 1:37:39 pm

Will this fit my MK 470?

Please contact MK Diamond at 1-800-421-5830 with your tile saw model and serial number and they will determine which part number is required for your saw. The contact Contractors Direct customer service to place your order.

Ratings & Reviews

13 reviews


m-k replacement motor for model 770

by -

very capable motor; easy to work on for repairs; design of gear head is inferior, needs a dust filter to protect the interior of the motor for longer life. best motor that m-k has available to date..


by -


Love this saw!

by -

Bought this replacement for my 770EXP. Love this saw. Lost everything in Hurricane Ike except for this saw. Tore up everything else but this saw. Motor even ran for a few days till the salt water it was submerged in corroded it. Was amazed how well it held up, still cuts straight and true. Love this saw! Durable and light weight! Only had to replace the motor!


by -

I wore out my "little" saw by using it so much because of the convenience of it's lighter weight. So when the moter gave out I tried to find replacement parts. No luck! But the price on the replacement isn't too bad considering buying a new one! Just be careful about the replacement screws. After years of usage, they may not want to let go and you can round them out if not careful.

Great replacement motor.

by -

This was a good replacement motor works great and its very quiet compared to my first one.

Replacement Motor for MD 770

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Motor works fine on my MK 770 tile saw. Would of gave it a five star rating, if it wasn't made in China!

MK 470 replacement motor


Perfect fit. Easy change over.

Great service


My experience with the order process, delivery and use of this product could not be better.

mk 370 replacement motor


motor replacement bolted right up to existing tile saw. Has already paid for itself. Quick shipping and comparable pricing.

IT fits

by -

I purchased this for my MK 270, which is about 20 years old. It fit, and works perfectly. About a third the price of buying the comparable saw new.

MK 470 replacement motor


Motor arrived quickly after ordering and was a spot on match and fit perfectly. The only thing is that I wish replacement parts were available for the MK motors. My motor that I replaced was only needing the main drive gear and shaft due to the gear loosing some teeth. Otherwise the motor was good.

Great replacement


The motor came as advertised. Bolted right on . No issues. Contractors Direct delivered quickly. No issues . I would buy from them again



Nice upgrade to a MK270. Slightly stronger motor than original MK270, which is a good thing. And very timely delivery.