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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The cruise is not on when I have used it.
Is the Allison supposed to automatically downshift to a pre-selected gear even though I have a mechanical engine. If there's some type of an ECM I suppose it would have to be somewhere in sync with the transmission. I thought it was strictly manually operated via the small compressor and tank but I also know there is wire running back there because I flip the switch and the pivot arm actuates the flapper arm. I'll check the exhaust brake with Wolfe's instructions given next time I'm out and see if I can see what the deal is. OH, and I have emailed Jacobs to get detailed instructions for it's use but they have not replied yet.
If I find the flapper has eroded, can it be repaired or does the whole exhaust brake have to be replaced?
Is the Allison supposed to automatically downshift to a pre-selected gear even though I have a mechanical engine. If there's some type of an ECM I suppose it would have to be somewhere in sync with the transmission. I thought it was strictly manually operated via the small compressor and tank but I also know there is wire running back there because I flip the switch and the pivot arm actuates the flapper arm. I'll check the exhaust brake with Wolfe's instructions given next time I'm out and see if I can see what the deal is. OH, and I have emailed Jacobs to get detailed instructions for it's use but they have not replied yet.
If I find the flapper has eroded, can it be repaired or does the whole exhaust brake have to be replaced?
