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Old 09-24-2018, 04:37 PM   #1
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500 ISM Jake brake

Does anyone know what the max rpm is for Cummins 500 ISM on downhill grades with the Jake brake applied, I have heard numbers like 2200 rpm as max.
2002 Monaco Executive 500 ISM
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Old 09-24-2018, 04:41 PM   #2
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Seems about right. My ISX is 2100 under power and will go higher when Jake is engaged but have never needed to let it go that high.
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Old 09-24-2018, 07:31 PM   #3
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I just spent 7 weeks in Colorado, New Mexico, Wyoming, Idaho and dealt with some serious 7% - 10 % long grades and the max rpm I saw was 2200rpm with the jake on.


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2004 HR Navagator 500 ISM
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Old 09-25-2018, 05:29 AM   #4
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If you let the rpm get too high the computer will up shift to protect the engine and you might be in deep dodo
Jim E
06 exec
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Old 09-25-2018, 06:11 AM   #5
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At 2300 a warning light comes on the dash of my 04 Dynasty..:time to get on the brakes and use a lower gear.
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Old 09-25-2018, 04:27 PM   #6
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2200 also sounds right to me. I think 2100 or so is the most I've seen on mine.
Mike & Trish Romans 10:9
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