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John Deere TriCycler Mulch Kit 38-inch Deck - BM21817
John Deere TriCycler Mulch Kit 38-inch Deck - BM21817

John Deere TriCycler Mulch Kit 38-inch Deck - BM21817

Part Number:BM21817
Your Price:$134.81

Universal Product Code



John Deere
Usually in stock


John Deere TriCycler Mulch Kit 38-inch Deck

The mulching attachment allows converting the mower so it can be used to mulch grass or leaves.
The attachment consists of special mulching blade(s), a deflector ramp to direct the clippings into the blade for re-cutting, and a discharge closure plate with adjustable baffle.
  • The blades included are designed to work with the StarLock™ blade mounting system used on 38-in. Mowers for X300 Series Tractors and also for the 38-in. Mower without StarLock used on LT Series Tractors.
  • The special mulching blades included can also be used for side discharging, though overall cut quality may decline slightly.
Operating tips
  • Adjust baffle to the proper opening. The adjustable baffle can be moved to one of five positions to match conditions using the convenient wing nuts.
    • When mulching grass, the operator should start with the baffle set in the highest position (greatest opening).
    • In drier conditions or when mulching leaves, the baffles can be moved down to reduce the amount of material that is discharged.
NOTE: The holes in the adjustable baffle are intended for leaf mulching. When mulching dry leaves, the holes will allow some air and leaf particles to escape, reducing blowout in other areas of the mower. However, when mulching grass, these holes can be expected to plug.
  • Mow when grass is dry.
  • Observe the 1/3 rule.
    • No more than 1/3 of the grass blade should be cut off at one time. This allows more efficient mulching and will promote the continued good health of the grass. If the desired cut height can't be achieved by cutting off 1/3, or there is clumping of the clippings, it may be required to cut higher. Wait a day, then lower the mower and make a second pass.
  • Mow at proper intervals approximately every four to five days.
  • Always mow with a sharp blades. 


  • Remove mulching attachment and install the appropriate medium or high lift blades.


  • Deflector ramp and discharge cover must be removed.
  • Special mulching blade may be used if satisfactory results are achieved; if not, remove and replace with standard blades. 

Compatibility information
The mulching attachment is compatible with riding equipment having a seat safety switch (in good operating condition) to prevent an operator from adjusting the baffle while the mower is running.

Fits models:
  • LT133
  • LT150
  • LT155
  • LT160
  • LT166
  • LX172
  • LX173
  • LX178
  • STX38
  • GT242
  • X300
  • F510
  • More
Factory direct shipping. Please allow up to 7 days for factory processing plus shipping time.
Replaces BM20496

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Customer Reviews
5 Stars
Mulching kit for STX38
The instructions are a little wrong, but it was easy to see how part #3 really fits. I can't believe I didn't convert my mower sooner. I'm tired of bagging and vacuuming up my fertilizer. Mulching puts some material back on the ground to absorb moisture, too.
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by:  from Atlanta, Georgia. on 8/27/2011
5 Stars
Just as described. Works great!
Did you find this helpful? 
Reviewed by:  from Titusville. on 10/6/2017
4 Stars
The kit installed relatively easily. It came with bolt, washer and nut for the mulching blades, but they were not designed for my X300. I simply reused the existing washer and nut. After installation, it appears to operate properly and do a good job. However, there is a low frequency cyclical scraping/rattling sound that it makes that I haven't pinpoint the source of. I don't think it is the blades hitting anything, or I would expect a much higher frequency noise. I am hoping it is safe.
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Reviewed by:  from Texas. on 7/26/2017
4 Stars
Good product
Good product. Easy install without removing deck. Though I did have to grind down one of the parts so the blades wouldn't hit. Very happy with my purchase.
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Reviewed by:  from Waukesha. on 5/22/2016
5 Stars
Nice Mulch Kit
I installed this on my LT150 Deere 38" tractor/mower. Very heavy-duty and works well. Instructions were slightly unclear at first, but once I started the install it became clear what I needed to do. Make sure you have a 3/8" drill to go through deck for one of the bolts. It's a thick nicely made deck - will take a good bit.
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Reviewed by: (Verified Buyer)  from Virginia. on 5/16/2014
5 Stars
Best Mulcher I've Ever Used
Although the instructions were less than perfect, it was easy to figure out since the tolerances weren't so forgiving. Once installed, it was even better than I hoped. The grass looks like a beautiful carpet with no clumps visible anywhere. Couldn't ask for a better performing product.
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Reviewed by:  from Agawam, MA. on 5/20/2013
4 Stars
Love it.
The kit was relatively easy to install however the directions did not always match the installation reqirements. The kit performance is outstanding (on grass). I should have installed it years ago. The lawn looks much better.
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Reviewed by:  from PA. on 9/12/2012
5 Stars
Mulching Kit
Relatively easy to install. Works great. No need for raking the clippings.
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Reviewed by:  from Uniontown, PA. on 4/24/2012
5 Stars
A guy with a lawn
PERFECT! I found it very easy to install. Works great as of 12/20/11. So far I have only used it for leaves. But looking forward to the grass in the spring.
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Reviewed by:  from Hernando, MS. on 12/25/2011
4 Stars
Works great. Had this installed on my LT 150. You have to sometimes mow over your clippings to leave a clean cut lawn but I'm sure this is a good as it gets. Had the dealer install this as they have a mobile maintenance truck and they had to do routine maintenance on the mower. Saves a lot of time now that I no longer have to bag grass.
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Reviewed by:  from MEMPHIS, TN. on 8/11/2011
4 Stars
Great kit, works well, bad directions.
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Reviewed by:  from WI. on 6/4/2011
5 Stars
great item! bolted in a couple of minutes and works great!
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Reviewed by:  from marion, SC. on 3/23/2011
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