Big Loads - Post Photos Number 2
Discussion in 'Heavy Haul Trucking Forum' started by truckdad, Aug 3, 2015.
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It is a 60k generator- headed to Hawaii, I thinkLast edited: Feb 2, 2021
Tug Toy, PPDCT, cke and 1 other person Thank this. -
Tug Toy, cke, Landincoldfire and 2 others Thank this.
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Down hill at a light weight like I was - around 120-130k - I would have liked to hold a speed around 45. The gear splits meant I could lock in 4th but that maxed at 35 mph at 1900 rpm (stage 2 of 3 on engine brake) or lock in 5th (stage 3 of 3 on engine brake) but that meant going 50 mph with no service brake application.Tug Toy, Razororange, cke and 1 other person Thank this. -
Then with my DD16 the power sweet spot is in the 1500-1800 rpm range - getting below 1400 causes pretty lugging and power falls rapidly. So what happens is as the rpms get to the high end of the power band the trans shifts (dropping 600 rpm) to the higher gear. The engine doesn’t have enough power to recover the rpm loss and the trans forces an immediate upshift. It bounces back and forth this way. So I lock it into the lower gear but this seems counter productive.
there is also an issue trying to change ranges in the auxiliary trans while climbing a steep grade (one of the exact places you want to change ranges). You can lock it in gear for up shifts but not for down shifts. This can cause the Allison to get confused and lose place if it try’s to shift while I am manually try to change ranges. This will cause you to have come to a complete stop - put the auxiliary in a range and the Allison in neutral then into drive. A not ideal solution.
so I am still working the bugs out of the combination- it is going to the Allison dealer next week to look at some program changes.
there is just a learning curve for me - from how did things to how I need to do thingsTug Toy, Razororange, cke and 4 others Thank this. -
it is a 4700RDS mated to a spicer 1750-4CTug Toy, black_dog106, cke and 2 others Thank this. -
cke Thanks this.
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