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Old 08-03-2018, 09:53 AM   #29
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All - First read my post "New to Alpines" and read the 1st paragraph. Other brands owners will give you advice which is WRONG for an alpine.

When going downhill, do NOT allow the engine RPMs to exceed 2300, you will blow it up at around 2500, this is straight from Cummins. When going up hill, shift down to 4th gear and keep engine RPS around 2100, this will keep the HYD pump on high speed and give you max cooling at the radiators fans. Remember, never go down faster than you went up the hill, brakes get hot, you want to use the engine/exhaust break for all of it as much as possible. On my coach, when I engage the engine brake, the transmission automatically shifts down to 4th gear, this is the way they are supposed to work, don't have exhaust brake, but assume it is similar, it should shift down to 4th gear too I believe. The exhaust brake needs some maintenance I think, search here in this forum for that information.

Long down hill stretch going into Las Vegas, never touched the brake pedal, used the high/low engine brake, and it worked fine. If new to diesels engines, take driving course, they have NO engine braking without either an engine or exhaust brake, not like a gasoline engine. DO NOT REPROGRAM SYSTEM TO CHANGE any braking or accelerating perimeters which were set at the factory by Cummins/Allison. Bad things can happen.

One last point-see all the time in Parks, folks put their rear wheels in the air and not in contact with the ground, now tell me which wheels have the emergency/parking brake again???? Hanging any wheel in the air without support is not good for the air bags, nor the suspension, put blocks or ramps so all the wheels have something under them, my major pet peeve this is.
Great info.My question is did Cummins program the motor to protect from over revving and over heating?
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Old 08-03-2018, 12:24 PM   #30
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Great info.My question is did Cummins program the motor to protect from over revving and over heating?

The Cummins computer is programmed to "de-rate" of overheating.


The Allison ECM is programmed to prevent overspeeding. Be aware that a higher than governed RPM is permissible with the engine not under load.
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Old 08-03-2018, 11:55 PM   #31
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No, they depend on the driver to read the owners manual for the engine and remember those parameters. Since very few people ever read the manual, I mentioned it.
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Old 08-04-2018, 06:39 AM   #32
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The Cummins computer is programmed to "de-rate" of overheating.


The Allison ECM is programmed to prevent overspeeding. Be aware that a higher than governed RPM is permissible with the engine not under load.
Thanks Brett.
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Old 08-05-2018, 07:56 AM   #33
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FWIW - Was talking to a Cummins shop Forman, in PDX, he was telling me about a upscale coach (million +) in the shop for overrevving going down hill. Said the engine must have hit over 3600 RPM and things flew apart, said it was going to take a new engine to fix. He said although AT will shift down to 4th, it will NOT prevent the engine from overrevving, that is called the brake pedal, and the operator has to make sure it does not happen, there are no magic bullets about this it's just common sense. I recommend anyone who has never driven large vehicles, especially diesel ones, to take a commercial driving class or find a business which teaches potential MH drivers. They teach you how to go down and up hills correctly. I rest my case.
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Old 08-05-2018, 08:26 AM   #34
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FWIW - He said although AT will shift down to 4th, it will NOT prevent the engine from overrevving...

Interesting.


Have only been in the situation where the engine reached over-speed on a descent one time (agree, it is our job to keep this from happening) BUT the Allison ECM automatically upshifted.


Would be interesting to visit with an Allison engineer about this, as it is my understanding that programmed into the shift protocol is "we WILL upshift to prevent over-speeding". Doesn't matter what gear you down arrow to, what you do with the throttle or service brake.
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