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  #1  
Old 05-26-2024, 12:43 PM
rdm522 rdm522 is offline
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Default D600 Operating Temperature

My 782d seems to be running hot to the touch. What temperature should the engine be running at? I run the engine about 30 minutes and the oil cap is so hot to touch. Is this normal? If not, what should I be looking at diagnosing?
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Old 05-26-2024, 01:55 PM
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Does the gauge still work? Is the insulation still on the top hose that goes to the radiator?

It is going to get pretty hot under the hood.
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Old 05-26-2024, 02:05 PM
rdm522 rdm522 is offline
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I’ll have to test the meter. It does still have the insulation on the top hose. However, it is somewhat weathered from age.
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Old 05-26-2024, 02:08 PM
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I am going to cut the grass with m 1572 this afternoon. I will take some pictures of the gauge after 30 minutes of run time. Good comparison test.
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Old 05-27-2024, 10:22 AM
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What is your gauge reading? I think anything over 140* will feel hot to the touch. Here's what the decal says under the hood. " Anything under 230* is normal". I don't think mine ever get above 170*.
DSC02997.jpg
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Old 05-27-2024, 03:38 PM
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This is after 10 minutes of run time.
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File Type: jpg IMG_0697.jpg (29.4 KB, 31 views)
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Old 05-27-2024, 03:42 PM
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After 30 minutes of working the mower pretty good. I stopped to see how hot the oil cap was and you could hold it 2-3 seconds. I let it run for a couple of minutes with no load and it cooled down fast. I mowed a little slower in the tall grass and it did not get as hot.
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File Type: jpg IMG_0701.jpg (26.1 KB, 31 views)
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Old 05-27-2024, 03:45 PM
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I do this to all my diesels and it helps. The crossover hose will pick up heat from the engine. Might be overkill but only takes a few minutes to do.
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Old 05-30-2024, 12:13 PM
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My 782D has a 180 degree thermostat. It has all new coolant and belts. It likes to run 190 degrees on hot days while mowing. The OE gauge has been replaced with a mechanical numerical gauge for better temperature accuracy.
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