997 shuts off when hot
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    997 shuts off when hot

    I have a 2006 997 with 2100hrs. Its been hot and humid here lately and I've been having some issues with my mower shutting off around the 1-1.5hr mark of operation. When it shuts off the second light from the front of the machine (there are 4 lights in a row) comes on and the machine beeps. If I leave it sit for about a minute it will restart. The grass has been hatefully tall and the machine is definitely working, I'm just surprised its shutting off on me like this. I checked the radiator and there was some grass built up behind the oil cooler, nothing excessive in my opinion.

    Any suggestions on what to look for or where to start?

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    coaltrain's Avatar
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    So what is the light that is illuminating?
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    firemachine69's Avatar
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    Did you clean off your rad? Have you changed the coolant recently?
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    Its lighting the oil pressure indicator light. If I remember correctly this is the only light that is on but there is a beeping nose, similar to when you initially turn on the key.

    I purchased this machine in April and have not cleaned the radiator since I've owned it. A flush is probably a good idea and baseline to have.

    Click image for larger version. 

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    coaltrain's Avatar
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    Then the engine is shutting down due to low oil pressure. This could be an effect from coming close to overheating but not likely. I don’t know this machine well enough to know if it might have an oil cooler?

    Since the oil pressure is what the machine is indicating the first thing I would do is change the oil and filter if it hasn’t been done recently. Make sure to use a good quality diesel oil and a factory (Deere) filter.

    Once that is taken care of (or already has been) it may indicate more of a major engine problem,.
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    It does have an oil cooler that is mounted directly behind the radiator inside the fiberglass cowling. It was relatively clean with some noted grass clippings between the cooler and the radiator. I changed the oil with 15w-40 caterpillar oil and a JD M806419 filter approximately 15hrs ago.

    I should mention the mower was shutting off more frequently when the temp was cooler back in May, I cleaned the fuel filter and did notice a significant improvement in frequency of shut offs. Its largely been fine through June and July aside of yesterdays issue and shutting off multiple times. I will check the clear filter assembly again to see if some crud has accumulated. The spin on fuel filter was also replaced about 10hrs ago.

    Is there an oil pressure sensor I should look at? It would be nice if there were gages as in a truck or car.
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    coaltrain's Avatar
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    Sounds like you have covered all the maintenance properly.

    The oil cooler you are seeing is likely for the transmission.

    I guess it wouldn’t hurt to change out the oil pressure sensor. Here’s the parts breakdown showing it (#7).

    Click image for larger version. 

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    Thanks for pulling the part number for me. Its cheap enough, I may just replace that for piece of mind. I'm also going to go back through the fuel system, tank pickup line and strainer and see if there is any junk in there. In May when I initially cleaned the water strainer there was some grey sludge in there, I never did look at the pickup line in the tank. I bought the machine at an auction so who knows how it was previously cared for.

    I'll report back with any findings. Thanks everyone for your help so far...
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    arlen's Avatar
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    It could be the sensor...I guess I would screw a gauge in there and verify oil pressure. It is critical to verify with an actual gauge.

    I wonder if that's actually whats shutting it down though. Isn't the oil pressure light on whenever the key is on, but the engine isn't running to build oil pressure?
    Could it be possible that something else is shutting it down? My 997 starts beeping whenever it shuts down from a seat switch or if you set the park brake before you move the control levers out. Maybe a seat switch?
    On a side note, I think the oil cooler behind the radiator is a hydraulic oil cooler.
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    There isn't a shut down feature for low oil pressure. It will beep and that's it. High engine coolant temp will shut off the pto to reduce engine load but will not shut down the engine. It hard to tell without being there.
    One idea is the engine rpm is low enough while it's dying that the oil pressure drops and turns on the light.
    The oil cooler in the rear is transmission and hydraulics.
    You say you bought it not to long ago. Is it a new 997R or a used older model? If new, get it to the dealer.

    Sent from my LGL52VL using Tapatalk
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