I have a 1999 big boy with Tmcc, but no Odyssey or cruise control. I have been having this issue when at low speed with a load or not. When increasing the speed steps at slow speed, I hear the motor powering up and then the engine will jerk forward. And continue slowly moving and everyonce and a while it will jerk again at slower speeds. It doesn't do this at faster speeds when moving.
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Check to see if anything is binding. Drivers, linkage
Sure sounds like something binding. I'd remove the shell and rotate the flywheel through a complete driver rotation. You should be able to feel where it's binding. At that point, I go around and shake all the connecting rods to see which one is tight.
gunrunnerjohn posted:Sure sounds like something binding. I'd remove the shell and rotate the flywheel through a complete driver rotation. You should be able to feel where it's binding. At that point, I go around and shake all the connecting rods to see which one is tight.
I've been wondering if it's the driver board.
If it doesn't have cruise, the driver is just the DCDR, they usually work or don't work. Long shot it could be the R2LC, but my money is on mechanical binding. If you need a DCDR, I have a few of them.
Is anything else affected when it jerks? Are you seeing lights blink? Possible dirty track, rollers, or wheels? Or all three? ....maybe dropping out power?....just dirty enough to be problematic at low speeds at not a problem at higher speeds??........Pat
My experience with low speed jerkiness is typically binding somewhere, when things speed up, everything smooths out, it just overpowers the binding.
One thing you might check, the traction tires. I just finished the second engine in a week, a diesel and steamer that both had the oversized thick traction tires binding on the brake shoes, I replace them with MTH tires and all is well.
gunrunnerjohn posted:My experience with low speed jerkiness is typically binding somewhere, when things speed up, everything smooths out, it just overpowers the binding.
One thing you might check, the traction tires. I just finished the second engine in a week, a diesel and steamer that both had the oversized thick traction tires binding on the brake shoes, I replace them with MTH tires and all is well.
Should a r2lc be getting hot? The one in this engine is.
How hot? If it's uncomfortable to touch, that's not right. The smoke triac gets pretty warm if you're running smoke.
gunrunnerjohn posted:How hot? If it's uncomfortable to touch, that's not right. The smoke triac gets pretty warm if you're running smoke.
It actually wasn't that hot.
The boards do get warm when the engine is running, too hot to touch is bad. 
Sid, keep us posted
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