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help me out guys...How much tire pressure?

Discussion in 'Lawn Mowing' started by bad_chad48, Feb 6, 2002.

  1. bad_chad48

    bad_chad48 LawnSite Member
    Messages: 98

    I have recently bought a Scag turf tiger 61"cut. It was used but only with 144hrs... My question is how much tire presure do I need to have in the tires.. Front and back... then what if the ground is wet...
  2. 65hoss

    65hoss LawnSite Fanatic
    Messages: 6,360

    My eXmark Lazer HP says 13 psi in both front and back tires.
  3. bad_chad48

    bad_chad48 LawnSite Member
    Messages: 98

    well according to the manual that I have, It calls for (somewhere)around 25lbs for the back then 10lbs for the front... is that pressure the best for cutting conditions? what about if the ground is wet?
  4. walker-talker

    walker-talker LawnSite Platinum Member
    from Midwest
    Messages: 4,771

    Shouldn't it say on the wall of the tire?

  5. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    Shouldn't it say on the wall of the tire?

    Not always the correct or proper way to always follow the sidewall. That is MAX load pressure. Always check you owners manual for this.

    My LC Lazer says 13 front and back as well.

    The rear tires say MAX pressure of only 10 psi !!!

    I dont understand that?

    If I only put in 10, its a bit too soft, plus the center of the tire is concave. My rears are only wearing on the outside of the tread. I may have 2 defective tires, I dont know? They will level out at about 16psi, but then its like riding on solid tires!!

    Anyone else have this same concave shape to the tread area on 24x12-12's ?
  6. Clewsew

    Clewsew LawnSite Member
    Messages: 60

    My suggestion is to start off using the manuals #'s as a gauging point, provided this the manual for the model that you have? If it feels too hard back off a pound or two at a time until you are comfortable with the want it feels and performs.

  7. Guardian

    Guardian LawnSite Senior Member
    from Florida
    Messages: 269

    AT first my dealer was recommending low pressure in the front so as not to abuse the bearings. now, they a actually pumping over 35lbs in those little babies.

    I run less than 15 in back (eXmark lazer) and 20+ in front.
  8. slickrick

    slickrick Banned
    Messages: 3

    Exmark says to measure the circumfrance of tires to make sure you are level ,regardless of pressure ,I did not realize tires of equal size can actually vary that much in size .
  9. Grass_Slayer

    Grass_Slayer LawnSite Member
    Messages: 173

    i have the same problem TLS, i pu 10# in both of mine like the sidewall and the book say and the center bows in.

    i also have 2 different tread patterns on th 2 rears. i turned around a fire hydrant and cut it a little too close. i ripped a 2inch hole in the side wall. co-op couldnt order the same pattern and i needed it asap so i just went ahead and got that one. they put in a tube that day and it held fairly well.

    my front tires hold 40psi!!!!! they r rough, im gonna take em down this season!!
  10. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    WHOA there with the 40 Psi!!!!

    Front casters on mowers should only be 13 (Exmark and SCAG) to maybe 15, and if its a heavy front runner, then go to maybe 20. 40 is just WAY too much, and you mind as well be running solid tires!

    The tire says MAX INFLATION 40PSI, thats the tire, not the manufacturer of the mower!!

    If you were running 40, you'll have to re-pitch your deck, as thats a big drop in height from 40 to 13 !!!

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