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Can I used car engine oil (10W-30) for lawn mower? Lawn mower is Black Decker MM875
19" Electric LAWNHOG Mulching Mower with Rear-Bag
correction: the car engine oil is new. (sorry for mistypo: the question should be Can I use (not used)

Yes 10w-30 will be more than adequate protection for your mower, dont worry about it, if you still dont know then check for recomendations in the manual that came with your mower.

2007-03-24 14:37:25 by heather s

amzn.to Earthwise 50120 20-Inch 12 amp Electric Mulching Lawn Mower with Grass Bag With 3-in-1 performance that allows you to choose between ...

Hello Helpful People,

I have a corded lawn mower (Black & Decker 19" Electric LAWNHOG™ Mulching Mower) and many of the 18v DeWalt power tools. I would love to run my lawn mower on one of my 18v DeWalt batteries. I know B&D makes a new 24v cordless lawn mower but the one I have is in great condition and I don't want to shell out another $450 just to run cordless.

My yard is not all that big and should be able to run on the 18v if I can find a conversion kit.

Does anyone know if anyone makes this? I have searched a few different keywords but not getting any of the results that I am after.

thanks so much!
-Doug

It's possible, but you might have to replace the AC motor with a DC motor or use a DC/AC converter to convert the DC into 120V AC, but that would make the machine very heavy. Either way it's going to be complicated. I would recommend you keep your tool the way it is if your yard's not too big and if you don't want the mess of making your tool cordless.

2008-11-28 16:18:43 by Doug

Hi,
We need to get a new lawnmower as the old electric hover mower gave up the ghost last week (started spewing smoke and ground to a halt!)
Has anyone got experience of mulching mowers? (check out http://www.mountfield-lawnmowers.co.uk/b uy-online/product.php?xProd=131&xSec =35)
We have an average sized level back garden and a sloping front garden. Our 3 kids play on the back garden and I'm a little concerned about 2 aspects of a mulching mower:
(1) The spewed-out grass will make the garden slimy and stain their clothes/shoes
(2) The spewed-out grass will go yellow and discolour the lawn.

Maybe my fears are unfounded?
I'd be grateful to know what you think or any recommendations you may have.
Ta very much!

Yes they do work,BUT, always a but in there somewhere. If you have a mulching mower you have to be a dedicated mower of lawns. If you let the grass become a bit on the long side the mulcher does not mulch so well, if you get what I mean. All the time the grass is short, they are fabulous, no clipping to worry about but it means cutting the lawn more often than you probably do now. If you do it once a week you will find that to keep thing right, you will need to cut about twice a week and sometimes 3 times a week. I f you are prepared for that, yes they work and are great, but if it is a chore for you to cut the lawn, then stick to the pick up type of mower.

2008-05-11 00:30:13 by it's not 42......

The previous owner left me huge piles of wet leaves againgst the fence, about 3 ft deep. What is the best way to get rid of them? I raked the majority into big piles. Should I buy an Electric blower/mulcher and suck them up and then put the droppings around trees/garden? I read the leaves break down into mulch when they are cut up. Or do I run my Toro lawn mower/mulcher over them and take the bagged up pieces and drop them around yard? And last do these leafs that become mulch eventually compost on their own?

Get them away from the fence, that will be bad for the fence if it is wooden. In order to blow leaves, they have to be dry. So you first goal is to spread them out so they can dry, or keep turning them if you weather is dry enough to help, If it is still wet in your area, use a pitchfork or 3 pronged rake to load them into a wheel barrow . Leaves that are used for mulch are run thur a special lawnmower, called a mulcher. If you leave them whole, it will take them a lot longer to break down . If you do mulch them with a mulcher, they are GREAT for your soil.

2009-05-20 07:11:51 by Noel

I've converted my lawn mower to electric with a 12V winch motor and two 12V batteries, and have $300 into it at this point. It pulls around 70 - 120 Amps.

... problem is it gets too hot and spins almost scary fast - it doesn't just mulch, it vaporizes.

Anyway, it seems I should be able to solve both problems by dialing down the voltage to around 10V. I could just throw a big carbon rod in series ($10), or was thinking about a big diode array (like 40 3A diodes in parallel) though that would only drop 0.6V ($50), or get a switching DC-DC converter ($100+). I'd prefer to do something where I'm not wasting 20% of my power (carbon-rod method).

Is there another way that's cheaper and/or better, or which is the best approach? Would the diode array method just burn up voltage the same way a resistor would or do they actually save energy vs. using a resistor to achieve the same effect?

A resistor is the cheapest way to go.

It should be scary, the blades could shatter...

at 100 amps and 2 volts, that is 200 watts, 0.02 ohms. difficult to find in that range. You may be able to wind your own out of copper wire, but the problem is keeping it from melting. bare #6 wire, you would need 50 feet.

Resistor, transistor, diodes, you are still wasting 20% of your power. DC-DC converters at that power level will be expensive and still waste 10-20% of your power.

One interesting alternative is pulse width control. You need lots of big transistors and a heat sink, but you won't waste as much power because the transistors are switched between totally on and totally off. With a good design, when on they will drop half a volt, using 50 watts. Basically you feed the transistors a pulse train, with a variable duty cycle. 50% duty cycle, you get half the voltage to the motor. 90%, you get 90% to the motor, etc. You can dial it down to 10% or lower for low speed operation.

I don't know what frequency to run it at, depends on the motor. Start at about 20hz would be a guess. Expect more noise and vibration, as the motor is getting switched on and off 20 times per second.


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2008-07-20 19:09:22 by David A