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Exmark hydro leak

Discussion in 'Mechanic and Repair' started by pickupman96, Jan 28, 2012.

  1. pickupman96

    pickupman96 LawnSite Member
    Messages: 51

    I have a 2007 lazer 60" and i just noticed a few drops of oil under it. It runs fine and no noise or ext. On the right hydro pump it seems to be coming from in between the two halfs and the other side its coming from the very front, the cap at the end with 2 bolts holding it. My question is could i get away with resealing them or do they need a full rebuild. And if they can be resealed, how much of a pita of a job is it. It also has 1300 hours. Thanks in advance.
  2. razor1

    razor1 LawnSite Bronze Member
    Messages: 1,985

    Maybe check the resevoir for metal shavings.
    Also if & when you do any work on the hydros (or sooner), replace the small rubber "T" line that runs back to the resevoir from each pump...it's a $15. part. Mine clogged last year and blew the pump on the side that clogged. One more thing, you can buy a rebuild seal kit for about $40. and replace any weeping seals. Good luck!
  3. pickupman96

    pickupman96 LawnSite Member
    Messages: 51

    I checked with a magnent and there were no shavings. Is it a hard job doing the seals. Any special tools, ext. How much more involved is a full rebuild, or just wait till they blow. Are they leaking just from age or is there something in there about to blow. I just don't want to go threw a reseal if there just going to blow anyway.
    Posted via Mobile Device
  4. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Messages: 314

    I redid one last year , mine was leaking from the shaft seal. I did not re-build it myself but sent it to a hydro shop . They rebuilt it and i think it was about 125.00 or close to it .
    The hardest part of the job is getting it out and putting it back in . It would've been easier had i had some help holding it while I screwed the bolts in .
    I already had the engine off being over-hauled so I was able to use a gear puller to pull the pulley off . I'm pretty sure you going to have to do the same as its a real tight fit in that area. But i know you have to remove the pulley before you can pull it out.
  5. ricky86

    ricky86 LawnSite Silver Member
    Messages: 2,122

    You won't know without a flowtest or a visual inspection.(with you have to do anyway). It could very well be the gskt or o-ring just dried due to heat. Especially if there's no metal in tank and it has no strange noises
  6. pickupman96

    pickupman96 LawnSite Member
    Messages: 51

    only noise it has it a little groan when you first go forward. I dont remember what is supposed to sound like. After you go about 1/8 way forward it goes away.
  7. MrOPEguy

    MrOPEguy LawnSite Member
    Messages: 32

    Its not that bad of a PITA, but you do need to know what to look for. It does not require any special tools, but as stated previously the only way to test the system for integrity is with a Hydrogear flow gauge. The things to look for is wear in the pump especially in the kidney ports of the thrust plate. Any signs of wear that can be felt with a finger nail will certainly constitute a pump replacement. If a pump case gasket has just failed and the pump itself is fine installing a seal kit is fairly straight forward. The key to this is the pump has to be surgical clean when reassembled. I typically will flush the entire system if any wear metal is found in the reservoir.
  8. pickupman96

    pickupman96 LawnSite Member
    Messages: 51

    Is there any other reason that the pump would be leaking other than bad seals. I am just trying to figure out all the possible things that im looking at. Thanks again for all the help.
  9. MrOPEguy

    MrOPEguy LawnSite Member
    Messages: 32

    If something was to let loose inside the pump. Example being, one of the thrust bearings came apart and got lodged in the 90* fitting on the return line it could cause the case pressure to build up too high and it would pop a seal. Normally though the output shaft seal is the one that would go first in this situation. It is not uncommon for the case head seal to develop a leak over time just from going through so many heat cycles. You will have to tear into it and take a look and see what kind of shape the pump is in, or have someone put it on a flow gauge and check the droop.
  10. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,335

    Pickup...you seem to be a little intimidated by the pump.
    In your case , the cure may be worse than the problem.
    Save up for a replacement. When it starts leaking more than a few drops a day.
    Attempt the repair.....if you can't get it back together,replace it.
    Posted via Mobile Device

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