Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

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Blade lock for mm850

Need to know how to lock the motor/blade so i can remove the blade for sharpening. I've looked everywhere and can't find a blade lock.

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  • daveleningto May 10, 2008

    I need the square parts that hold the blade on. Bog box hardware stores don't have them. Any where else you can think of?


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Use a 2x4 at least 1-3' long. Clear the grass chute so you have unobstructed passage from the back of the mower and into the blades. Wedge the 2x4 longways in through the chute and up against the blade. The other end can be **** up against something sturdy i.e. a concrete block, a wall, etc... (in my case I used my leg). Take your wrench and crank like hell.

Posted on Apr 30, 2008

  • jwhazel May 01, 2008

    I'm not sure why it decided to censor my word above. The **** is supposed to be the word "but" plus "t".

    To maybe give a better visual representation, think of a right triangle from geometry. The side is formed by the blade being vertical, pointing towards the sky. The hypotenuse is formed by the 2x4. And the base is formed by the ground. As long as you have something wedged against the 2x4 where it meets the ground (your foot, a concrete block, the wall, etc..), the blade will not turn.


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1 Answer

How do you change cutting blade on a Sears Craftsman Mower?

Hi Bill:
Changing blades is pretty straightforward but does involve some Safety Hazards.
- Blades can have sharp bits - WEAR GLOVES
- Running engines can make the blade BITE - BAD
ALWAYS disconnect spark plug lead whaen changing blade.
Easy Part:
- Raise deck to maximum height
- If possible, park with front wheels on a ramp to get better access under deck.
- Use socket wrench to remove bolt from centre of blade. Here's where the gloves help as you hold the end of the blade to prevent it from turning when you apply force to remove the bolt.
TA DA! The blade will come off.
- To install new or sharpened blade (I use an angle grinder to sharpen mine) tuck it in place, install the bolt, snug it up, make sure any notches or splines line up, protect your hands (gloves) while you tighten the bolt. and you're back to cutting grass.

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1 Answer

Husqvarna rz46 23 after 50hrs right blade is not cutting clean. air in tires, leveled, adjusted blade pitch & cleaned air induction holes, sharpened blades, too Could it be loose belt/bearing issue?

Hi Alan:
You're the best person to answer those questions.
With the motor OFF, mower engage OFF, and gloves on, try to wiggle the blade tip up and down. If there is slack you'll be able to find the source. I broke the spindle housing on mine. An easy remove and replace, but it sure messed up the cut angle.

Jul 25, 2015 | Husqvarna Garden

1 Answer

How do the blades position

if there timed blade there will be nottches for them to go in if regular blade just put the on put the curled -part of the going toward deck this is up if fin points down that is bottom install blade up blade toward deck bottom this will circulate air through shoot for grass ejection all done

Sep 01, 2014 | Garden

1 Answer

Remove blades to sharpen them

Most have a bolt holding them on. Hold blade and remove bolt. When installing them, most have indents or pin for proper aleignment

Dec 22, 2013 | Garden

1 Answer

Black & decker mm850 can not get blade off so can replace how do I get off tried loosen clockwise and counterclockwise plates move will not loosen up

The nut is counterclockwise but will most likely take an impact wrench to remove the blade because the impact will not need the blade or spindle to be held in order to remove the nut.



Mar 23, 2011 | Garden

1 Answer

I have a yardman 6.5 h,p.push mower. How do I drain the oil to change it and how do I remove the blade to sharpen it?

I am assuming you have a Briggs & Stratton motor. If you have a "yardman" engine the procedure is still the same.
Changing the oil: Your mower does not have a drain plug on the bottom of the mower. Remove the dipstick and tip the mower over on that side. Let the oil run out and leave it tipped over for 5 minutes or so to get all the old oil out. Replace it with 22 oz of good 10w30 or straight 30w oil. I personally use Mobil One and change it once a year.
Blade: With the mower turned over you will see a bolt in the center of the blade. Remove that bolt and the blade will come off. Use a box-end or socket so you don't mess up the nut. It may be hard to loosen at first. Inspect the blade. If it has not large nicks or the dings and the back of the blade is not worn too much (the curved part) you can sharpen it with a file or grinder. Try to take the same amount off of both ends of the blade. (If you want to know how to balance the blade let me know)
If the blade has large dings, is bent different on one side more than the other, or parts of it have cracks, replace it with a new one.

Don't forget to change the air filter.

Jan 04, 2011 | Garden

3 Answers

Shaft turns while trying to remove blade on B&D MM875 elec. mower

Here's the scoop on the MM875: it has a plastic piece called a "blade insulator" (part # 241381-01) that "locks" the shaft to the blade, so that you can remove the nut by stopping or blocking the blade. If it has been damaged or stripped out, then stopping the blade won't do anything. However, the metal spacer directly under the nut IS still locked to the shaft (because of its shape), so you can use a pipe wrench or something to hold that in place and unscrew the nut. You might even be able to get someone in a home improvement store to do this for you. But you will still need to replace the insulator, which is only a few dollars.

Jul 22, 2010 | Black & Decker 19" Electric Lawnhog...

1 Answer

Cannot remove blades for sharpening removed the center bolt from the blade that goes into the shaft and could not get the blades off the shaft Do I need to take a sledge hammer to it?

Spray the blade/shaft top and bottom with WD40, etc.,and let soak for awhile. Take a pipe wrench, as large as you can get under the deck, and place on edge of blade about 4 inches from shaft. Use the wrench as a fulcrum to pivot the blade off. If needed do both sides of blade until it lets loose. Hope this helps...

Jul 05, 2009 | Garden

1 Answer

Need to sharpen my blades.not sure exactly how to

there should be a bolt in the meddle of each
blade 9/16 or 5/8 headed bolt remove the bolt sharpen
blade w/grinder and replace same as removal

Jun 20, 2009 | Garden

1 Answer

How can i change the blades

If it looks like a bolt holding the blade on then you'll have to put a wrench on the nut on top of the pulley top side of deck and use an impact or breaker bar on the bolt were the blade is. When putting the blades back on when the bolt bottoms out just tighten up on the nut a little more (with impact) or as much as you can (with breaker bar) also wedge a block of wood in the blade (blade turning counter clockwise to remove- clockwise to tighten) just in case the blade tries to turn on you. To sharpen put the blade in a vise and use a hand grinder and basically follow how it looks keeping the same pitch that is there and the cutting edge to look kinda like the edge of a knife but don't sharpen the back side of the blade just try to clean up any burrs on the back edge by useing a wire wheel on a bench grinder.Also while sharpening don't push to hard or stay in one spot so that you don't leave bluing on the blade (it cuases week spotson the cutting edge)

Dec 21, 2008 | Husqvarna 19.5hp 46" Yard Tractor

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