John Deere 38-inch Deck Mulching Kit

Part Number: BM21817
19 Review(s)
John Deere 38-inch Deck Mulching Kit
John Deere 38-inch Deck Mulching Kit
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Your Price: $189.39
John Deere 38-inch Deck Mulching Kit
Brand John Deere


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 recutting, and a discharge closure plate with adjustable baffle. This kit also includes installation instructions.

This 38" mulching kit is compatible on the following models with 38" decks that have two blades.

STX38 Lawn Tractors
F510 and F525 Front Mowers
F510 andF525 Front Mowers
LX172, LX173, LX176, LX178, LX186 and LX188 Lawn Tractors
GT242.GT262andGT275Lawna nd GardenTractors
LT133 Lawn Tractor
LT150 Lawn Tractor
LT155 Lawn Tractor
LT160 Lawn Tractor
LT166 Lawn Tractor
X300 Lawn Tractor
LX255, LX266, LX277. LX279, LX288. GT225, GT235 
325, 335,345 and 355D

  • 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
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 4 to 5 days
  • Always mow with a sharp blade(s)
  • Remove mulching attachment and install the appropriate medium or high lift blade(s)
  • 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 blade(s)
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.


  • California use info:

    ⚠ Warning: Cancer and Reproductive Harm -

Feature 13


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Customer Reviews

Software Engineer
This kit was easy to install as all the holes on my STX-38 lined up perfectly. The function of the mulching blades is top notch and I couldn't be more pleased with the result. If you are thinking of converting your mower to a mulching mower this kit will do the trick.
Did you find this helpful?  14 of 15 Found Helpful
Reviewed by:  from Nampa, ID. on 8/17/2015
Easy to install and works great!
My Father-in-law gave me his old LX173 with a side discharge. I purchased this kit so that I could use the tractor to mow around my house and help out my neighbor. The kit was easy to install. All of the holes for the bolts lined up perfectly. I used the original mower bolts for the mulching blades. It actually mulches better than my power mower!
Did you find this helpful?  8 of 9 Found Helpful
Reviewed by:  from Middletown, PA. on 6/16/2015
home owner
easy to install. I have a LT133 38" deck and I did not have to drill any holes to install as the instructions said one might have to. It seems to mulch just as good as my Honda mulching push mower.
Did you find this helpful?  7 of 9 Found Helpful
Reviewed by:  from Wisconsin. on 7/14/2015
Mulch kit works great!
Installation was very easy, everything fit properly. I installed this kit on an older LX176 and had to drill a hole in the deck as shown in the instructions, but this was no problem. I have only used it once so far and the cut quality seems to be very good.
Did you find this helpful?  6 of 7 Found Helpful
Reviewed by:  from Waynesboro, Pennsylvania. on 7/17/2015
Works for LT150
I installed this on my older LT150 and it works very well. The instructions are not as clear, but a quick search on Youtube made this a 10 minutes install.
Did you find this helpful?  4 of 5 Found Helpful
Reviewed by:  from Olathe, KS. on 5/6/2016

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