Exmark lazer z hydro pump blow out

Discussion in 'Mechanic and Repair' started by Billsz28, Jun 29, 2012.

  1. Billsz28

    Billsz28 LawnSite Member
    Posts: 70

    Hi guys I have been lurking on this forum but I just decided to register finally. I am a mechanic for a landscaping company. Recently I had a very severe hydro pump failure on a 2007 lazer.
    I have rebuilt and replaced many hydro pumps and motors and this is the biggest mess I've seen

    Normally I just flush out all the lines, the reservoir and put on a new filter, and fix the damaged component. This time there is soo much metal in the lines and reservoir I am concerned about the wheel motors and the other pump

    Should I go through the trouble to take those apart to clean them if debris? I was thinking about just doing as I normally do but I feel that won't be effective enough

    Anyone been through this or have any reccomendations?

    Thanks
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  2. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Bill ...you shouldn't get any cross contamination..the fluid goes thru the filter before it goes to the pumps..
    On the real bad ones..I flush 1 or 2 qts of Mobil 1 thru the wheelmotor..
    Cut the opening of the Mobil 1 contaner just large enough for one of the high pressure hoses to fit in it...Hold the hose to the bottom of the quart bottle and turn the wheelmotor.
    I usually flush 1 qt in one direction and 1 in the other direction...
    remove and clean the hoses and tank....
    If you stick a large magnet to the side of the hydotank...the tank will magnetize and catch the metal shavings before they reach or clog the hydro filter. Just make sure to glue the magnet so it doesnt fall off and release all the shavings at once...
     
  3. Billsz28

    Billsz28 LawnSite Member
    Posts: 70

    Hey thanks for the help. I think I am going to do what you suggested. I can't afford not to. It's easier than tearing the pump/ motor apart cleaning and reassembling
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  4. ricky86

    ricky86 LawnSite Bronze Member
    Posts: 1,702

    First thing you have to do is determin what the metal is from. Is the splines in the wheel motor failing or is it just the input or thrust brg. New pump will go by by quick if the motor is failing. If you can't tell, take it apart. It's the most through way to clean it anyway. If it's got big hrs, it's definitely a good idea.
     
  5. Billsz28

    Billsz28 LawnSite Member
    Posts: 70

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  6. Billsz28

    Billsz28 LawnSite Member
    Posts: 70

    The cylinder block thrust bearing deteriorated sending the balls free which severely damaged the cradle bearings, cylinder block jamming the pistons and ruining the swashplate as well. This occurred on the right side. I found a lot of metal in the hydro fluid tank and lines. The system had the original filter too! This machine has very high hours and unfortunately has not been maintained.

    I'm going to go ahead and inspect the internals of the wheel motor for damage. Thanks for the help and I'll keep you guys updated.
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  7. ash3001

    ash3001 LawnSite Member
    Posts: 9

    Keep us posted on what you find out about the wheel motor. i've been trying to get a parts break down for one online and am having no luck. i got lucky and found the hydro pump breakdown along with internal part numbers. let me know if you need it i'll post it here for you
     
  8. Billsz28

    Billsz28 LawnSite Member
    Posts: 70

    I have access too all the service manuals/ parts diagrams. Thank you though I appreciate all the help

    If you give me a specific model I'll most likely be able to get you a service diagram. Many exmarks use Parker wheel motors, specifically the TF series. I think you will find this link particularly helpful

    http://www.parker.com/literature/Hydraulic Pump & Motor/HY13-1512-006 Service Torqmotor TB-TH.pdf

    I decided to flush the wheel motor with 1qt of mobil 1 15-50 each way before taking it apart. The motor seems to be in good condition based on how it felt and that no metal shaving came out At all

    I'll let you guys know if I run into any problems after I install the new pump
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  9. ash3001

    ash3001 LawnSite Member
    Posts: 9

    thanks i feel kinda lazy now that i see the link I've been looking for the wheel motor breakdown for a few days, and finally found it.(HYDRAULIC WHEEL MOTOR NO. 1-523328) some one suggested that the symptoms i have with mine may be just air along the one side. Also i have a toro but I've noticed that for the most part all the zero turns use the same hydro drive systems ( Had scag walk behinds that i played with and took apart)
     
  10. chipk1

    chipk1 LawnSite Senior Member
    from Florida
    Posts: 392

    I just went through a hydro pump blowout on my 2009. Had shavings everywhere. I took the reservoir and lines out completely. flushed the lines, washed the tank out. I then manually flushed wheel motors out with mobile one by hand turning the wheels. New filter and oil. 1 year later everything is still fine.
     

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