Warming up hydraulic fluid?
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    mike01's Avatar
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    Warming up hydraulic fluid?

    My owner's manual talks about warming up hydraulic fluid by turning the steering wheel until the wheels stop turning and holding it there. It cautions not to do this for more than two minutes or damage could result. Does anyone know what is actually going on that is warming the fluid? And also, would actuating a lever and holding it down (or up) on something like a rear SCV to which nothing is connected achieve the same thing?
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    Captain Hook Kennyd's Avatar
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    It is sending the hydraulic system into relief, making it heat up quickly. I don't think this is a good idea (or needed) unless its really cold, like sub-zero cold. The fluid will heat up without that since it is being pumped through the system all the time, so running for a few minutes will get it warm enough in most climates, as will the engine oil be warming at the same time.
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    Ditto I agree with Kenny. I've read on some brands of orbital steering it's not good for power steering valve to hold in full turn position for any length of time
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    So does using an SCV lever to which nothing is attached accomplish the same thing?
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    Quote Originally Posted by mike01 View Post
    So does using an SCV lever to which nothing is attached accomplish the same thing?
    Anything that causes the hydraulic pump to go into relief should have the same effect. So dead-headed couplers on the SCV should bog down the pump the same as turning the steering to the stops.

    Here is what my 2720 Technical Manual says:

    Hydraulic Warm Up ProcedureReason:For accurate hydraulic tests, the oil must be heated tonormal operating temperature of 43įC (110įF).

    Procedure:

    1. Install JDG temperature gauge on supply line to oilpump.
    2. Apply park brake.IMPORTANT: Avoid Damage! DO NOT overheat oil.
    3. Start engine and run at fast idle.
    4. Operate hydraulic system to create back pressure insystem:
    ---a. On units without SCV—Use a 13mm open*endwrench to partially close isolation valve, located onside of rockshaft, until system pressure relief valveopens.
    ---b. On unit with SCV—Operate SCV lever to causesystem to go over relief.
    5. Operate until oil reaches normal operating temperatureis within specification.
    Last edited by jgayman; 01-02-2019 at 11:13 AM.
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    Quote Originally Posted by mike01 View Post
    So does using an SCV lever to which nothing is attached accomplish the same thing?
    Yeah, but a better option would be to get a short hose with 2 male ends on it, then the fluid can flow. We did this on the loader tractors at the farm to keep the fluid warm on cold days.
    It's amazing when it's -20* even with the equipment working how quick the fluid cools off. Quickly remember to cycle any cylinder on the loader before doing actual work with it (lift, dump, or grapple).
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by Cutty72 View Post
    Yeah, but a better option would be to get a short hose with 2 male ends on it, then the fluid can flow. We did this on the loader tractors at the farm to keep the fluid warm on cold days.
    It's amazing when it's -20* even with the equipment working how quick the fluid cools off. Quickly remember to cycle any cylinder on the loader before doing actual work with it (lift, dump, or grapple).
    Any open center hydraulic system does this normally anyway. The fluid is pumped non-stop and it usually comes through the rockshaft valve and dumps over the rear end gears. Adding a hose would do nothing in this scenario.

    On a closed center system, this would cause the pump to work at 100% flow capacity as it tried to maintain pressure in the system. This doesnít build up the heat like a relief valve would.

    Just food for thought.
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    Quote Originally Posted by dieselshadow View Post
    Any open center hydraulic system does this normally anyway. The fluid is pumped non-stop and it usually comes through the rockshaft valve and dumps over the rear end gears. Adding a hose would do nothing in this scenario.

    On a closed center system, this would cause the pump to work at 100% flow capacity as it tried to maintain pressure in the system. This doesnít build up the heat like a relief valve would.

    Just food for thought.
    IDK, but it made/makes a heck of a difference on our 4240 and now on the 7700.
    Never claimed to be an expert, I just know it works.
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by Cutty72 View Post
    IDK, but it made/makes a heck of a difference on our 4240 and now on the 7700.
    Never claimed to be an expert, I just know it works.
    Yeah, I imagine both of those machines are closed center. You are causing the machine to work harder for sure. More work = more heat. But itís not going to generate the same amount of heat as a relief valve lifting does. Lifting a relief is the quickest way to heat up oil, thatís why it can be dangerous. Itís simply dumping all that power being generated and converting it straight to heat.
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    Cutty72's Avatar
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    Quote Originally Posted by dieselshadow View Post
    Yeah, I imagine both of those machines are closed center. You are causing the machine to work harder for sure. More work = more heat. But itís not going to generate the same amount of heat as a relief valve lifting does. Lifting a relief is the quickest way to heat up oil, thatís why it can be dangerous. Itís simply dumping all that power being generated and converting it straight to heat.
    I think it's more just keeping it flowing, so the pump is warming the fluid somewhat, and warm fluid is constantly being returned to the tank, so it stays warm(er) overall, vs the oil in the hoses and cylinders that are cooling rapidly at -20* and thus slow moving for the first cycle.
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