Hydro filters?

Discussion in 'Mechanic and Repair' started by Tharrell, Dec 26, 2007.

  1. Tharrell

    Tharrell LawnSite Silver Member
    Messages: 2,967

    I thought of something while reading another thread and instead of hijacking it, I decided to start this one.
    I recently had to change the hydro fluid in my Lesco 52" walkbehind. The shop changed the filter and filled it with synthetic fluid. I noticed the machine was more responsive after that particularly in reverse.
    My question is, do hydro filters clog or restrict the flow over time?
    The machine had plenty of fluid before the change. Tony
  2. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    hmmm that raises some interesting questions for my own machine, but to answer the question, if they put a filter on it they put it there for a reason, and for this reason over time it will clog, absolutely. Now as for flow restriction, that would depend on if the filter has (or not) a flow bypass valve, so 50-50 it's just as likely the fluid change itself did it, but still it has to be replaced.
  3. Happy Frog

    Happy Frog LawnSite Bronze Member
    Messages: 1,224

    You have to make sure the filter(s) and new fluid have the same specifications as the old ones. Some filters are better quality and a higher flow than others.
    And yes, filters tend to clog over time (same as fuel filters).
  4. Tharrell

    Tharrell LawnSite Silver Member
    Messages: 2,967

    Navarre? The other end of P'cola beach? I lived on Via Deluna for a long time. How do you put up with the traffic and touristas? I'm glad I missed the hurricanes too. Tony
  5. Breezmeister

    Breezmeister LawnSite Bronze Member
    Male, from South Jersey
    Messages: 1,796

    Yes, but... A hydro system is a "closed" system, which means the only way to get dirt into it is from the filler tube at the tank. The point of the filter is to stop the wear and tear of the metal parts of the pump and wheel motor from recirculating back in to the system and causing more damage.
    With a gas or diesel engine, you have the wear of metal and with combustion, contaminants that can and do get pass the rings.
    Now, the funny part, Depending on who you talk to..

    1 The system should never need to be changed unless you have a problem.
    2 The system should be charged every year.

    Hope that helped :)
    ericg likes this.
  6. treemonkey

    treemonkey LawnSite Member
    Messages: 178

    I don't know if this is relevant or not, but here goes. At another forum, a guy was looking to find a generic hydro filter for his Scag to save dealer cost ($25 +/-). A direct cross over could not be found with any of the filter manufacturers (Wix, Puralator, Champion).

    A bit of cross referencing came up with some "will fit" replacements, but they (including WIX) had a 25 micron rating while the Scag advertises a 10 micron filtering level.

    Is it possible that the 25 micron filter would flow better? But, it would allow larger particle to pass by and might compromise your system.

    As above, check what filter was used as a replacement.
  7. Breezmeister

    Breezmeister LawnSite Bronze Member
    Male, from South Jersey
    Messages: 1,796

    Look at it this way, with a 25 micron filter, anything smaller then 25 microns will get by until the filter is "filled" to the point of restriction. That might be good for a car or small equipment engine. Where as a 10 micron filter, only "dirt" smaller then 10 microns gets by. One micron is 1 millionth of a millimeter if I remember correctly.
    So yea, a 25 micron filter would flow better, but you are letting 15 more microns of trash get by the will wear out your pumps and wheel motors that much faster then a 10 micron filter would.
    And for what it is worth, I've seen 2 after marker hydro filters burst, one was a Fram and the other was a no name. With the cost of pumps and wheel motors, I'd use the OEM filters....:rolleyes:
    ericg likes this.
  8. Happy Frog

    Happy Frog LawnSite Bronze Member
    Messages: 1,224

    Actually, traffic isn't bad at all compared to big cities and there are not as many hurricanes hitting our coast as the news would make you believe...
  9. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    I wouldnt say its dirty but more of........the older filter is more saturated with oil and maybe not as fast a flowing as the new one for a bit....I dont know how to explian it but Ive noticed it over the years


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