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72inch Lazer Z Hydro Pump and Belts getting real hot .

Discussion in 'Mechanic and Repair' started by Floridalandcare, Jun 13, 2013.

  1. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Posts: 314

    Got a Lz31dg724 Serial 291303..
    The mower is old with 2500hrs ,The problem is it keeps wearing the hydro-pump belts out . I put a new one on today and cut maybe 2 acres and it shreaded it ,went through 2 more belts with the same results . The first belt was an Exmark belt the last 2 were from Discount Auto. Also i should note that the pump pulleys spin freely by hand and the idler is all lined up. Every time the belt shreads the pumps are extremely hot . I believe it has a hydro oil cooler that runs through the radiator but not sure. Right now Im draining the hydro oil and filter and gonna see if that helps ... anyone have any other ideas

    P.S With a new belt on it -it runs great no abnormal noises or smell but after about 20 minutes I can feel it slip alittle then dead in the water.
  2. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    A few things to check....
    Make sure you have the right belt....5 rib pulleys or 8 rib pulleys...
    Make sure the pulley grooves are clean and the high points of the grooves are not sharp as a razor..
    Make sure the idler arm isn't sticking..causing a loose belt ...and superheating the pump pulleys...
  3. Stonewellmark

    Stonewellmark LawnSite Member
    Posts: 48

    Check the tensioner pulley bearing, is it spinning freely and quietly?
  4. Exmark PR

    Exmark PR Sponsor
    Posts: 238

    Try checking the belt for proper tension by checking idler arm bearings, springs, and spring anchors. It sounds like the belt is slipping, getting hot, and breaking. You also qualify for a free ROPS. Please call our Customer Service team 800.667.5296 and they can set this up for you.

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