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Preventative Maintenance–PTT Fluid

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  • Preventative Maintenance–PTT Fluid

    Was wondering if anyone during their annual PM evacuates all PTT fluid from reservior in order to refill with new fluid every year.

    My SM only states to verify PTT fluid is at the level of the cap, and if not to fill. No mention of changing the old with new. Which is a head scratcher to me. Does PTT fluid remain clean, like forever or something? I would think over time the fluid becomes less efficient/effective.
    Jason
    1998 S115TLRW + 1976 Aquasport 170

  • #2
    there is not a drain plug or any way to drain all of the fluid.
    also as long as not seals leak there is not way to contaminate the fluid.
    no heat to cause the fluid to deteriorate either

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    • #3
      Originally posted by 99yam40 View Post
      there is not a drain plug or any way to drain all of the fluid.
      also as long as not seals leak there is not way to contaminate the fluid.
      no heat to cause the fluid to deteriorate either
      All good points, all of which crossed my mind. And its this that caused me to post this thread. Just seems odd to me. If a 20 yr old PTT motor had never required replacement, seal replacement, or other reasons requiring emptying the reservoir, then the fluid is 20 yrs old. Not strange? But hey, maybe the fluid has a operating life of forever. Idk.
      Jason
      1998 S115TLRW + 1976 Aquasport 170

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      • #4
        Jason think of it this way. Your vehicle has ATF in the transmission and power steering fluid in the steering system, both these are hydraulic fluids. Do you change these out? I have never changed the transmission or power steering fluid in any vehicle I ever had. These fluids do way more "work" than any Trim/Tilt on an outboard.

        I put 550,000 km on my 1995 Toyota camry and when I sold it, it was still running fine.

        Yes checking your Trim/Tilt every year for proper level and water in it is good idea...but changing it is not necessary. The fluid will last the life of unit unless something mechanical goes wrong with the trim unit itself.

        I believe a friend of mines Mercruiser trim used 10w30 motor oil for hydraulic fluid. Could be wrong about that though.
        Last edited by panasonic; 07-17-2017, 05:42 AM.

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        • #5
          My 2014 F150 PU does not even have a transmission dipstick/fill tube.
          When asking about why, the comments were that too many people put the wrong stuff in them causing problems.
          If you have a leak you need to take it to a dealer and have it fixed and serviced/filled properly by trained techs.
          I do not like where this kind of stuff is going.

          I did run across a vehicle once back in the middle 70s that someone drained the motor oil and then tried putting the fresh motor oil in the trans tube.

          anyway the trans fluid is recommended to be replaced from time to time now a days, but the interval is way on up there in miles.

          but never heard of power steering fluid change out before.
          sealed systems should not need it if seals hold up

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          • #6
            Originally posted by panasonic View Post
            Jason think of it this way. Your vehicle has ATF in the transmission and power steering fluid in the steering system, both these are hydraulic fluids. Do you change these out? I have never changed the transmission or power steering fluid in any vehicle I ever had. These fluids do way more "work" than any Trim/Tilt on an outboard.
            Your point is valid and spot on. My thinking of uncertainty revolves around the corrosive environment the PTT unit is subjected to, and how this environment differs from automobiles. You know how salt has the ability to creep into areas where it should not be able to penetrate. But it does.

            So I was just curious to hear from others about their rationale behind PTT fluid. Appreciate all for the responses.
            Jason
            1998 S115TLRW + 1976 Aquasport 170

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            • #7
              I wouldn't change my PTT fluid. But on my autos, I change the ATF, the PSF and the coolant. I used to just let it go, but then I had a very high mimleage Silverado which started to shift funny. The fluid I removed was black, like used engine oil. With new fluid, the trans shifted much mo' betta. For the PSF I use a turkey baster. I figure if the fluid I take out is a whole lot darker than what I put it, I'm doing the car (and my wallet later on) a favor. Each time I change the oil, I remove the contents of the reservoir and refill. I change my boxers too. All the time. Unless I'm going commando.
              Last edited by oldmako69; 07-19-2017, 08:40 AM.

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              • #8
                I just dog it till it dies then whine about it.
                the PTT is a sealed system with basically no heat.
                as long as it stays sealed it lives.

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