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Help needed Jacobs Extarder

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Ned:
Dianne,

The Extarder isn't made by Cummins, is a Jacobs product and is put on by the coach manufacturer.  It's just one model of exhaust and engine brakes made by Jacobs.  Still, it's surprising that a Cummins shop wasn't familiar with it.

dpickard:
Hi Jim, and thanks for your reply.

All I know is what the sticker says in the cockpit. It says "Jacobs Extarder."

I have read the manual and all it says is to cut it on and not to accelerate when it is on. Does this mean that they intend for you to keep throwing a switch every time you want it to work?

I am a woman of fairly reasonable intellect, but the so called instruction manual baffles me and IMHO is pretty useless in terms of practical operational instruction.

I am left wondering what I DO have here. Is it an engine compression brake or an exhaust brake?

Will the "REAL" Jake Brake please stand up???

dpickard:
Ned,

Thanks for your replies.

Yes, even tho it is made by Jacobs, I just thought that a Cummins dealer ought to know about anything hooked to or affecting their engines.

Dummy me. I learned the hard way. But then again, when I was handed an $881.00 bill that day for an oil and filter change, I should have learned that Cummins Atlantic isn't on my side to begin with. I quickly sat down with the Cummins engine manual and typed out
the steps to an oil and filter change on my coach, and while I read the steps out loud and provided moral support, Gil was able to change the oil. Have all of you who are probably getting a good laugh by now figured out that this is our first pusher?

Tom:

--- Quote from: dpickard on October 25, 2005, 09:21:09 AM --- Have all of you who are probably getting a good laugh by now figured out that this is our first pusher?
--- End quote ---

Dianne, I doubt anyone is laughing as many of us learned the hard way. You were smart enough to ask for help before learning any more stuff the hard way.

Ned:
From your description, it sounds like your Extarder is manually operated and not connected to the engine computer (you probably have a mechanical engine, no ECM).  Follow the instructions, turn it on when needed, and turn it off when you have your foot on the accelerator.  You don't need it for most situations, but when coming down a steep grade, you'll be glad you have it as a diesel engine offers NO braking at all, unlike a gas engine.  The procedure for descending a grade is to use the same gear on the transmission as you use going up and keep your speed down so the transmission doesn't upshift.  Turn on the Extarder, downshift the transmission and get the speed down before starting down the grade.  When you get to the bottom, turn the Extarder off and drive as normal.

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