How does the Jacobs Extarder work?
My m/h is a 1994 Allegro Bus, 5.9B 230 hp (mechanical engine) Cummins DP. It is equipped with a Jacobs Extarder. From what I understand, to stop confusion in what it's called, it is now just called ...
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More RPMs equal more braking and the reason it should be automatically downshifting when you turn it on and take your foot off the gas. Try manually downshifting to keep the RPMs around 2200 with occasional brake use.
