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Unit is MM2000
I was mowing over piles of leaves to mulch them. Got some sticks stuck and it stopped the motor. It started to smell so I stopped. The motor is much weaker now. I took off the cover and the brushes are an inch long. I sanded them as one had chips off the corners. I sprayed the motor with electrical cleaner. No change. So research led me to the idea that the rectifier might be damaged. It is not visible as mounted. I assume it is under the motor.
Looks like you have to remove the motor from the unit to get at the rectifier. Well I have it all taken down but it will not come off. It seems like there must be something holding it from below but there is nothing visible. there are 3 machine screws that are under the fan and one screw on top in front. Otherwise I see nothing holding it yet something obviously is. Anyone got ssome info or at least a repair manual?
Thank You

Read operators manual thoroughly.

mechanic mark said:

https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/black-decker/lawn-mower/mm2000-type-2/mower

Official Black & Decker MM2000 TYPE 1 electric lawn mower parts | Sears PartsDirect

Black & Decker MM2000 TYPE 1 electric lawn mower parts - manufacturer-approved parts for a proper fit every time! We also have installation guides, diagrams and manuals to help you along the way!

www.searspartsdirect.com

Read operators manual thoroughly.

Click to expand...

Thanks. I had found that sears page. That expanded diagram is not my mower. I tried Jacks before I came on here and also did not find help. I saw that diagram too. It is my mower but there is obviously something missing or too small to see as the motor does not lift off in the way it is indicated with removing those 3 screws behind the fan. So I am grateful but IDK how to use that help. Something is not letting that motor lift off the deck.

Edit- I was able to enlarge it and it seems the two screws #80 may be the problem. there is no access to them from under the motor.

Is your battery fully charged?

mechanic mark said:

Is your battery fully charged?

Click to expand...

It is a corded mower.

Soooo :/ I wrote Jaks an email then decided to go look again and egg on face sure enough scraping with a tool instead of my hand removed dirt that exposed two hole where the problem was. There was no rectifier underneath when I got the motor out. I see no way to removed the top plastic part of the motor where the brushes sit and it looks like some replaceable part is under.
Like I said it runs by weaker. I put it back together (sure enough extra screw??) as the grass is needing to be cut. Is there a diagnostic manual for these?
Thanks for the help

I did the curb strips and it started to smell like burnt electrical motor so I quit.

The latest. 4-18-24
I finally got back to it and when I opened it to try to remove the top I found that the brushes had melted the plastic of the top piece I wanted to remove. They were stuck. I persuaded them out with big channel locks. I removed the two screws in that diagram but the top did not want to come off. I am wondering if my problem hasn't been the brushes all along. I'm going to ask at the shop that I can't afford to pay to fix it. It makes sense that they would get hot if they weren't working right and that melted plastic explains the hot electric motor smell.

Number I had was dead. called a different place He told me I ruined the windings and buying a new mower would be cheaper than paying him to replace the motor. I found a couple motors online but there is no picture. I suspect they are not the complete motor assembly with all parts. I can't get this one apart so if I bought the windings which I suspect that is what is for sale I wouldn't be able to install it. For any other MM2000 13amp 20inch owners the motor assembly part number is 5140164-38.
I'm not sure what I am going to do except spend money I should not have to.

Well I purchased a battery mower and let myself be fooled by the 40V. It was very weak. Turns out after I looked into how to determine amps that it is just 6amps. OK I found a complete motor for the MM2000Type 2. I ordered it and I hope to be fixing this soon. I will let you know. I will be returning the battery mower.

Well the motor (brake assembly) finally shipped. Apparently lying about having something for sale is OK these days. They had to order it from the manufacturer and they had to make one before shipping it. I guess I should be grateful I didn't have to wait until the 20th which is when they told me it would ship but only after I asked several days after the purchase when I had not heard from them.

5-17-2024
OK Finally got the motor and installed it and it is working. Below is the name and number to search under for it.
Just to be clear I learned via this process that there is a type 1 and type 2 MM2000. Mine is a type 2. Not knowing that "type 2" data point probably played a big part in my troubles searching for answers.
Thanks to everyone who tried to help.

Black and Decker Brake Assembly. #DWB-5140179-36

just my opinion, but I stopped buying/using anything Black & Decker 30years ago because they just weren't worth my money anymore.