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Exmark hydro maintenance

Discussion in 'Lawn Mowing' started by Richard Martin, Dec 29, 2001.

  1. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    I'm not sure about other brands of mowers but if you have an Exmark or Toro/Exmark ZTR you really do need to make sure you do the hydro system maintenance.

    My buddy brought his Exmark over and we changed the filter and drained all of the fluid from the reservoir. His mower has 239 hours on it and it was bought new this year.

    Just for kicks we cut the old filter open to see if there was anything inside of it.

    We were amazed to see a lot of crud inside of the filter. It was actually caked up on the filter media.

    I don't know if this is normal or not but it sure was scary looking. It was the dirtiest filter I have ever seen.
  2. leaflawnandlimb

    leaflawnandlimb LawnSite Member
    Messages: 198

    must be doing it's job then. I would pobably look at his cap seal to make sure there is no debris getting in.
  3. I hope that wasn't the first time changing it.

    Do it with in the first 50 hours, then at 500 hours.

    If it was the first time, then there still was some lube left in the filter from when the hydro system was assembled.
  4. accuratelawn

    accuratelawn LawnSite Senior Member
    Messages: 922

    The owners manual says to change filter and fluid after initial 150 hours. Every 500 after that.
  5. johnnywalker

    johnnywalker Banned
    Messages: 61

    LGF, is the 50 hr change necessary? Have been running petroleum based systems up until last year but went closer to Exmark's service sched. (125hrs first change) for the TTHP.

    "With eXmark hydros using Mobil 1®, you change the oil and filter after the first 250 hours, then only once a year. "
  6. That's what I've always done. Must work since I never had a hydro problem on my Exmarks.

  7. Atlantic Lawn

    Atlantic Lawn LawnSite Senior Member
    Male, from Outer Banks NC
    Messages: 949

    Check the seal on the cap,make sure that the seal is in good shape.I've never cut a filter open to know if "crud" build up is normal or not, sealed systems aren't suppose to be crud filled.Now I gotta cut one open to see.Thanks
  8. Mark

    Mark LawnSite Senior Member
    Messages: 723

    Ive changed mine several times on my Z and walkbehinds and the fluid always looked clean. I think next time ill do what Richards friend did just to see. Really there shouldn't be any gunk inside, ive rebuilt alot of hydro motors and have never seen any symptoms of wear other than the seals. You can change out the Lands on the motors the narrow lands run alot faster than the wide. Hydro motors should last many many yrs, ive seen them last for 18yrs with just 2 rebuilds. Marks Mowing Service
  9. If I recall correctly the hydro filter is a 1 micron filer, the fluid had better be clean going though that. And with it being in a sealed system, there should be no debris in it.
  10. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    So there is no confusion regarding the proper filters and maintenance intervals for a 2001 23hp Kawasaki engined Lazer Z here is what the manual says.


    2.8.5 Hydraulic Filter: Replaceable cartridge type.
    P/N 1-513211: 10 microns, 18 psi bypass (Summer use above 32 F)
    P/N 1-523541: 40 microns, 18 psi bypass (Winter use below 32 F)

    5.1.26 Change hydraulic system filter:
    Service Interval: After First 250 hrs.
    Then yearly thereafter

    This was copied directly from the Exmark owners manual that I downloaded from Exmark.

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