Question about Craftsman 21 hp 42 in. Deck Yard Tractor - CA Model

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I have a model 944-604810 riding lawn mower and find that it leaves a trail of cut grass even though it is equipped with a mulching blade and a new mulching cover. It would appear that the grass is not getting fully mulched on the first pass and requires additional passes. Could this be due to dull cutting blades?

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Yes that is most likely the cause of it, also, you have to cut more often when mulching, and the higher the cutting deck, the more likely the grass will blow out without getting mulched enough. More than likely, the blades are dull, and/or the grass is too high, or possibly even wet if it is high.

Posted on Aug 23, 2010

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1 Answer

How to use mulch plug on cordless mower


Mulch plugs are typically a cover that is affixed to the discharge chute of a mower deck. As blades spin, they cut grass, and lift them up into the swirling air above the cut grass and below the mower deck. The clippings are suspended until they are blown out of the chute.

Mulching, is the process where grass clippings aren't simply discharged out of the chute after cutting; rather they are kept under the mower deck and spin around suspended in the blades resulting in repeatedly being cut. Instead of long clippings exiting the chute, much smaller clipping result from multiple cuttings and settle back on to the lawn under the deck. The smaller clipping allows them to decompose much quicker and return nutrients to the lawn.

Long clippings take longer to decompose and can turn into thatch on top of soil between blades of grass - effectively smothering the lawn. Long clippings can sit on top of cut grass and choke off sunlight, etc. and cause dead spots. Thatch can occur with mulching too - but takes longer to accumulate.

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My 2 year old Husqvarna riding mower, with the welded steel deck, has the mulch kit installed ( I installed it). When cutting, the mower ususally leaves a thin line of uncut grass. More, when the grass...


I too have had that same problem. I found that "old" blades when repeatidly sharpened and worn will cause the same problem, also aftermarket blades instead of original manufactures recommended blades may not be dimensionally correct, too short. I have had to go back to using original blades to correct the problem.
This should work for you.
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Sep 06, 2011 | Husqvarna Lawn Tractor  25 HP 54in Deck...

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There are a couple of things going on here. First, the blades are likely worn out and need replaced. As they wear and loose some length they can leave a trail. Second, if you have regular blades on a deck configured (by having discharge plugged) for mulching and you are using regular blades, then you can have a problem with build up. Third, you can have clumping problems if the grass is not dry when you are mowing.

I hope this is helpful for you.

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2 Answers

To mulch my grass clippings, do I have to use the side discharge or can I simply remove the bag and insert the rear plug?


Insert the rear plug if mulching is desired. The key to mulching is to mow the lawn frequently.You want to keep the mower deck height high enough to cut the grass and allow the mulching blades to work, but just low enough to actually cut the grass in a smooth uniform height. To low of a cut setting will clog the mower and create a mess. 2 times a week is a good frequency to start with.

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1 Answer

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Hi Tom,
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Can a mulching blade work in a non-mulching mower?


True Mulching mowers have a specific deck design to them, but I would say yes to your question.It's been quite a few years, but I have done this little conversion myself - replace regular blade with a mulching blade. Just make sure the mulch blade does fit your mower. Also, use something substantial in terms of strength to close the discharge opening. There can be a good deal of force placed at the opening from flying debris. You'll also want to make the cover removable, so you can mow damp grass without the cover.

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1 Answer

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A regular blade has a straight cutting edge, a mulching blade is bent to have a high and low cutting edge. Even if you have a mulching blade on, if the grass is too high or wet or you're cutting too low, it won't do a good job and may require a second pass.Raising your cutting height can help. Hope this helps. Dwain

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