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What makes motor shutter while under load

i have a 2007 pete with a c15 cat and a 18 speed auto .when i am under a load pulling hills or stuck in traffic .when i start to get to the top gears of my tranny 16 and up my motor starts to shutter and shake .i can turn my fan on and will stop after a while

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First, make sure you aren't in too high of a gear for your load and grade. You may need a TACHOMETER, BOOST GAUGE and PYROMETER to do this. If neither your boost or EGT is the problem, then check your fuel and air filters, and replace those if necessary. It could also be an ACERT or sensor problem, so if replacement filters don't address the issue, call your local Caterpillar shop and/or Pittsburgh Power ASAP and have them take a look. You may also need Peterbilt to have a look, though I would use them only as a last resort.

When this starts happening, I note you are in 16th gear, and I would like to know what RPM you are at.

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had problem with my truck it was a frayed wire in speed censor fixed wires and problem was solved

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Sounds like symptoms of fuel line restriction, might be time to change those fuel lines.

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My C-15 MBN motor would shutter in the 1300 - 1400 RPM range at high turbo boost pressure. I changed the crankshaft dampener and added a crankshaft balancer and that cured the problem.

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tks for the help.taken truck to a cat and pete shop cant find the problem.will try the fuel lines.

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I have 06 Acert and had the same symptoms. Mine was worn out comshaft and rockers. Run your overhead and take a peak in there...

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My friends 2000 C-15 was doing this, he had a broken rocker arm.

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