Discussion in 'Lawn Mowing' started by rdh, Jul 12, 2001.

  1. rdh

    rdh LawnSite Senior Member
    Messages: 394

    will the highlift blades give you more vacuum if you take spacers
    off so they are closer to the top of the deck ?

    what happens if you change blade hight this way (hi-low) ?

    would this have any thing to do with blow out ?

    what give more vacuum?
  2. KD'sLawns

    KD'sLawns LawnSite Member
    Messages: 160

    It will cause more problems than it will be worth. Manufacturers set the blade heights for optimum performance, that's why they do all the testing and experimenting.
    If you move your blade closer to the deck, all of your cutting heights will be totally different. Also, the un-cut grass will be so high that it blocks clippings from reaching you discharge chute thus, not allowing for very good bagging if any at all. If you mow tall moist grass there will not be enough space between the blade and the deck to allow for clippings to fall back through causing build-up on the deck that the blades will have to plow through. the build-up will contribute to no vacuum from your high-lift blades, and dull and worn blades quickly.
  3. awm

    awm LawnSite Gold Member
    Messages: 3,354

    i always side discharge so my experience is there.
    high lifts will give more vac than standard.for me a set of high lifts on top of mulchers created enough vac to suck a cast iron meter plate into the blades. the only thin about a lot of vac is the air is got to go somewhere. i assume this may be why some have blow back on doubles.later now
  4. Stonewall

    Stonewall LawnSite Senior Member
    Messages: 280

    On my old 48" Scag walkbehind with a Trac Vac, I would do what you suggest and put the blade above the spacers. If you're cleaning up leaves/straw and not cutting grass, it does the job. Reduced blowout tremendously.

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