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Old 03-10-2014, 09:27 PM   #1
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Retarder switch?

What does the "retarder" with do, on the Providence 40X DP?


Thanks

Tom

I really don't understand why the manual does not explain things more.
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Old 03-10-2014, 09:48 PM   #2
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The retarder(common on allison trannies) absorbs energy to be dissipated as heat to provide braking action. It is a fairly efficient method of braking.
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Old 03-10-2014, 10:36 PM   #3
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Quote:
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The retarder(common on allison trannies) absorbs energy to be dissipated as heat to provide braking action. It is a fairly efficient method of braking.

How do I use it?
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Old 03-10-2014, 10:50 PM   #4
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How do I use it?
Used a lot on downgrades to prevent excess wear on regular brakes. It downshifts the tranny and decreases speed.

Go down a steep grade. Press it.
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Old 03-10-2014, 10:54 PM   #5
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Someone on real computer - isn't there a sticky on Air Brakes - Retarders - Jakes etc. Can't get to it easily on my iPhone - but pretty sure there is one.... Can anybody link to it?
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Old 03-10-2014, 11:06 PM   #6
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Manuals

There's more to it than just transmission downshifting. The attached picture is a PAC-Brake commonly used on Cummins & Cat diesels.

Google 'diesel engine brake' and you'll find about 10,000 explanations.

I leave mine on almost all the time and let the computer decide when to engage it. Especially in hills or traffic!
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Old 03-10-2014, 11:24 PM   #7
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I can't find the sticky - but if your like me - you have an Allison 3000 with Retarder. It works like this ---
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Old 03-11-2014, 01:43 AM   #8
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We use retarders on the 45 foot tour buses I drive in AK - they work well but do generate heat, so watch your transmission temperature on long descents.
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Old 03-11-2014, 07:09 AM   #9
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I leave mine on constantly except when in ice or snow. lift the accelerator and it kicks in by itself. depress accelerator and it shuts off. drove truck for forty years with a three stage jake and never had a problem even in the winter, take it for what it is worth
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Old 03-11-2014, 07:19 AM   #10
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I use mine all the time except in snow and ice. It is wired into my brake pedal and I have a joystick as well. Learn where the trans temp is taken. In the sump no more than 250 in the retarder it can go to 300.
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Old 03-11-2014, 09:28 AM   #11
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Retarder

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I leave mine on constantly except when in ice or snow. lift the accelerator and it kicks in by itself. depress accelerator and it shuts off. drove truck for forty years with a three stage jake and never had a problem even in the winter, take it for what it is worth
Doesnt leaving it on decrease your mpg of the Diesel Engine?
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Old 03-11-2014, 10:23 AM   #12
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We are talking a retarder. It only activates when I push the brake or pull the joystick.

This might explain it.

Transmission Retarder Operation - How Does It Work
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Old 03-11-2014, 11:46 PM   #13
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My understanding is that the three types of auxiliary braking are completely different from each other - exhaust brake (PacBrake is an example) creates engine compression braking by blocking the exhaust, Jake brake (Jacobson) creates engine compression braking within the engine itself (I'm not familiar with these), Retarder creates drag inside the transmission.
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Old 03-11-2014, 11:57 PM   #14
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I sure could be wrong, but suspect that your coach does not have a transmission retarded. Labeled that way, and it is a retarded of speed, but probably a exhaust brake.

What engine, as that would probably help confirm Exhaust vs Compression brake assist.

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