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158cc MTD PRO 500 Series

I change the blade,flter, spark plug and the oil because it was running poorly. Now its running great but its turnnig way too fast. Feels like its gonna tear itself apart. How do I adjust the the speed. Thetrottle is one bar on the handle. Its got to be held down or mower wont start or run No speed adjust . Need to slow it down a bit?

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Posted on Jan 02, 2017

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SOURCE: My 22" MTD Yardman push

These inexpensive mowers are not made for large scale mowing. They're set to run as fast as they do and have low compression (read that as low power also) to make them easy to start and operate. About the only thing you can do to make it work better is keep the air cleaner clean, use fresh gas and keep the blade sharp so it cuts the grass easier. Mowing more often also means less cuttings under the deck so it works more efficently.

Posted on Aug 31, 2010

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SOURCE: 07 mtd yardsman mower with 13.5 tecumseh runs great untill engage mower , then dies down and blows black smoke

This sounds like a micro switch acting up, the first switch to check is the seat switch, make sure the block connecter is pushed fully home on the switch ( there is often a fail safe inside the connecter should the block come away from the switch )

Posted on Jul 08, 2012

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SOURCE: how do i idle down the engine or govern down the engine on a briggs and stratton 550 series mower model 10T802

that engine uses a fin style governor remove the upper cover and see if there is a nest or something holding the fins movement

Posted on Jul 19, 2012

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Hello, The 2004 MTD Pro walkbehind doesn't have an oil plug per say. I am guessing you wish to perform an oil change. The oil filler cap/tube assembly is also the drain, as is with many walk-behind mowers. ( Here's a link of the engine breakdown showing the parts: )

Make sure the gas has been drained/run dry - this will prevent accidental spills during this proceedure. Next, for safety, disconnect the spark plug wire. At this point, I usually have a couple of blocks handy to place the side wheels ( the ones on the side with the oil dipstick ) On your model it should be the right hand side. just at the edge of the fan cover cowling. between the blocks, have a container ready to catch the oil, I use one of those square margarine tubs as the sides are low - but any suitable container will do. Bear in mind, it should hold about 1/2 to one litre of oil. Be carefull not to tip the machine with the spark plug down - this will cause the air filter to become contaminated and lead to poor starts or not at all. ( If this happens, replace the air filter.) Now jus tip so the spiggot is over the container and allow to drain. Tip back into normal upright position and fill to propper mark. Simple Tip: save any oil containers - they come in handy for the used oil and are easy to take to the hazardous waste disposal.

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First spray a prime down the throat of the carb with the choke in the run position and attempt to start. If the motor hits and runs for a second then its a fuel related issue and you will need to remove and clean the carb. If it wont run or try to run on a prime then it may be an ignition issue. check for spark. If no spark then remove the ground wire from the module and check for spark again. If still no spark suspect the module, if spark with ground wire removed then wiring or switch is the culprit.

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1 Answer

Cant get blades off

Clockwise, but you need a good impact, or you'll have to give the wrench a good whack (which isn't a good idea). It's best to lock the blade down so it can't come around and cut you. Also, it's a very good idea to remove the spark plug wire.
Best regards, --W/D--

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Please rate. Thanks jj505

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