Go BottomTC40D rough idlesurging
 | John
Join Date: Posts: 1 
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2006-03-02 125447
I recently starting working for a public works department and they have a New Holland TC40D with 500 hours on it. They purchased it new. From the first day it has had a rough idle, it surges between 800 and 900 rpms constantly. They have even had it back in the shop when it was under warranty but they said the problem was never fixed. I guess they don't care about it but it bugs me. Otherwise it is an awesome tractor. Does anyone know what the idle rpm's should be and what might be causing the rough idle?? Thank you for your time and help.
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| roadrunner19
Join Date: Mar 2004 Posts: 8 South Cental PA
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2006-03-03 125527
TC40D have a tendancy to surge at idle and yes idle should be around 900rpm ....
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 | Peters
Join Date: Feb 2002 Posts: 3034 Northern AL 
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2006-03-03 125533
Often the rough idle is low cetane rating. I would try adding some booster to the diesel and see what happens. ....
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