Backing Problem With AutoShift Trans

Topic 25412 | Page 3

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Don's Comment
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My experience in the Kenworth I drove at CFI was the same as this Mack I drive now.

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I have found no leeching or any other issues when backing in the Mack Pinnacle's with auto trans. For myself, it is about the throttle control and brake use "single foot two-step".

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Sounds great. Unfortunately with certain year/model trucks it's impossible to control. You try to feather it and press ever so gradually down on the accelerator. For a couple seconds it is: nothing...nothing...nothing, and then VROOM!

G-Town's Comment
member avatar

Torque.

...a rotating force that can overcome resistance. By using the differential lockout (turn it on), you'll double the torque applied to the restance of the loaded trailer by adding an additional active drive axle into the mix. Although it may not completely alleviate the lurching or the "loading-up delay", it will definitely help especially when performing an alley or offset back.

Try it.

Hobo's Comment
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RealDiehl happy I could help out, lol

And, we have a winner, Matthew was right. Disabling the hill start assist got rid of the lurching. Truck still won't creep so I still have to be careful with the go pedal but at least it's not shaking the cargo now.

RealDiehl's Comment
member avatar

Torque.

...a rotating force that can overcome resistance. By using the differential lockout (turn it on), you'll double the torque applied to the restance of the loaded trailer by adding an additional active drive axle into the mix. Although it may not completely alleviate the lurching or the "loading-up delay", it will definitely help especially when performing an alley or offset back.

Try it.

I'll give it a go next chance I get. Also going to experiment with the hill assist. Fingers crossed...and thanks for the suggestions.

Robsteeler's Comment
member avatar

Torque.

...a rotating force that can overcome resistance. By using the differential lockout (turn it on), you'll double the torque applied to the restance of the loaded trailer by adding an additional active drive axle into the mix. Although it may not completely alleviate the lurching or the "loading-up delay", it will definitely help especially when performing an alley or offset back.

Try it.

I have to agree. I always have to lock my diff when I get home and back the bobtail into my driveway. Truck doesn’t like the driveway apron but with both axles it’s no problem. I have to say, I think the freightliner Detroit 12 is the best of the automatics. I think it’s because it’s a regular manual drivetrain controlled by computer. I think it works great. I put it in manual and give it a good surge and it goes right into creep mode.

Bobtail:

"Bobtailing" means you are driving a tractor without a trailer attached.

Susan D. 's Comment
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I was just going to mention the hill assist but someone beat me to it. I had to deliver a load to an ip near my home and my other half already being on vacation wanted to ride along. This IP has an angled dock and of course I was delivering tall paper rolls so was quite heavy. I mentioned the lurching and clutch overheating he said to try turning off the hill assist. It worked. He said hed figured it out completely by accident when hed accidentally turned it off in his own truck. Apparently the truck "thinks its struggling under a load " and attempts to compensate. Worked like a charm. He still dislikes his new truck also so they've got him on the list to get the next new manual that comes in. It's purely in the settings on our newest trucks that everyone is hating on but at least with the manuals the driver chooses the gear so they're not such slugs. Our trucks downshift too late and upshift too early when climbing hills and they've locked out our manual mode. If I didn't hate changing trucks so much I'd get on the list too, but I've just learned to deal with it. We also have been hiring more people with the manual restriction so they do want more trainers in autoshifts to accommodate them. Every trainee but one that I've had since getting this truck has had the restriction.

OOS:

When a violation by either a driver or company is confirmed, an out-of-service order removes either the driver or the vehicle from the roadway until the violation is corrected.

RealDiehl's Comment
member avatar

Hallelujah! It's like night and day after engaging the Differential Lock and turning off hill assist. Just backed in with zero problems. I'm actually looking forward to my next back.

Solo's Comment
member avatar

This is about the ONLY thing I like about my auto-shift...it's smooth backing.

It backs just fine in normal operation, but there are times that I will turn the Hill Assist feature off, and I can feather the truck back as needed.

But lurching (in rev) is something it has never done loaded, empty, or bobtail.

Bobtail:

"Bobtailing" means you are driving a tractor without a trailer attached.

Robsteeler's Comment
member avatar

What I like about my new truck is performance mode. My old truck had that feature deleted, but the new one has it. Really helps the shift points on hills etc. It doesn't keep going into E coast right before the crest of a hill like it does in economy mode. 😂

Susan D. 's Comment
member avatar

Our new trucks, sadly, are locked into economy mode. Says it all, doesn't it?

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Automatic Transmissions Tips For Shifting
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