x748 Hydraulic Leak from Transaxle
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Thread: x748 Hydraulic Leak from Transaxle

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    x748 Hydraulic Leak from Transaxle

    New to the forum and hoping some veterans can help a newbie out.

    My Setup
    2010 x748SE 550 Hours
    Reugg 3pt Hitch
    JD45 Loader

    Hydraulic fluid and Filter changed in November and has seen about 25 hours of use since. The transaxle is not shimmed as far as I know. AUX hydraulic pressure is 1100psi on all 4 ports.

    I added the 45 loader on recently (a month ago) and was not aware I needed the upgraded pressure relief valve. I used it for about 1 hour to break out a small stump. When I parked it I noticed hydraulic fluid coming from the transaxle. I asked the dealer the next day and the dealer did not think I would have done damage with the limited use, but I did tell him that I was pushing a small stump out. I got the relief valve and arm and installed them. I thought all was good, but came out this morning and there was a pile of hydro fluid on the ground under the axle. I put it on ramps to clean it off, and figured out how it is occurring. When I park in the garage, I usually move both hydro levers up and down after I shut the machine off to release the pressure. I did that this morning when I was on the ramps and heard the fluid and air coming out of the vent. I can recreate this when the machine is cold or hot. It does not appear to be overfull, but might have been a little high. That said, it leaked about 2-4 cups of fluid in total.

    Any thoughts from the experts? I know the easy answer is to take it to the dealer, but if there is a simple fix (I'm not afraid to work on my stuff) and I can save significant money, I will give it a shot.

    Thanks in advance.

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    Superglidesport's Avatar
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    Quote Originally Posted by mycornerofthebarn View Post
    New to the forum and hoping some veterans can help a newbie out.

    My Setup
    2010 x748SE 550 Hours
    Reugg 3pt Hitch
    JD45 Loader

    Hydraulic fluid and Filter changed in November and has seen about 25 hours of use since. The transaxle is not shimmed as far as I know. AUX hydraulic pressure is 1100psi on all 4 ports.

    I added the 45 loader on recently (a month ago) and was not aware I needed the upgraded pressure relief valve. I used it for about 1 hour to break out a small stump. When I parked it I noticed hydraulic fluid coming from the transaxle. I asked the dealer the next day and the dealer did not think I would have done damage with the limited use, but I did tell him that I was pushing a small stump out. I got the relief valve and arm and installed them. I thought all was good, but came out this morning and there was a pile of hydro fluid on the ground under the axle. I put it on ramps to clean it off, and figured out how it is occurring. When I park in the garage, I usually move both hydro levers up and down after I shut the machine off to release the pressure. I did that this morning when I was on the ramps and heard the fluid and air coming out of the vent. I can recreate this when the machine is cold or hot. It does not appear to be overfull, but might have been a little high. That said, it leaked about 2-4 cups of fluid in total.

    Any thoughts from the experts? I know the easy answer is to take it to the dealer, but if there is a simple fix (I'm not afraid to work on my stuff) and I can save significant money, I will give it a shot.

    Thanks in advance.
    Are you checking the hydro fluid level hot or cold. I'd suggest to check it hot. If cold it may be expanding during operation and exceed the vent overflow level. Additionally, loader operation may be heating the fluid more than normal operation exacerbating the overfill situation.

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    Thanks for the quick reply. I had been checking it cold, and just checked it hot. It is at the top of full, so maybe it was a little overfull. I'll keep an eve on it and see if it happens again.

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    arlen's Avatar
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    My X748 is pretty sensitive to being overfilled. It seems like every time I changed the hydro fluid, it would drip a puddle for a couple months.

    I keep mine a little on the low side now. You will have to watch yours carefully since you have loader cylinders that will cause your level to fluctuate.

    By not having the upgraded relief valve in, you were probably LESS likely to damage something since the upgraded one probably has a higher setting.
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