1989 L9000
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Junior User
Joined: Mar 2012
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Last, but I'm sure not least: Does anyone know approximately what the normal max RPM's on this truck should be? With my tractors, I never operate them over 2150-2200. My assumption with this Cummins is the same. Thanks for any and all advice.
Cargo Master
Joined: Dec 2015
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From: Harned, Ky
Assuming it's a Big Cam 4 or N14 they do their best work at 15-1800 rpm while 21-2200 is considered max, I never liked lugging them below 1400 for very long.
Had a couple of Big Cam 3's with turned up pumps that would peek at 2500 rpm, but only ran them reved up on late night long stretches of road trying to keep up with the big boys.
If your truck wouldn't run over 100 mph you were just bear bait for them, smoky bear would chase you down and they would get away.
Had a couple of Big Cam 3's with turned up pumps that would peek at 2500 rpm, but only ran them reved up on late night long stretches of road trying to keep up with the big boys.
If your truck wouldn't run over 100 mph you were just bear bait for them, smoky bear would chase you down and they would get away.
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Junior User
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Thanks Destroked. This one is geared low, it does 62 mph at 2100. I drove it 300 miles up from Iowa in August. Lots of irritated people on the freeway because of me.
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Cargo Master
Joined: Dec 2015
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From: Harned, Ky
It's obvious that truck was built to haul and not for speed but that sounds a little slow, are you sure you've got it in high gear, some of the 8LL's and 15 spds had reversed shift patterns in the last two gears.
What does the gear pattern on the sun visor show.
There's usually a tag on the front of the axle tube that list the gear ratio it has, on some Eaton's it's hand stamped on the front of the 3rd member.
Also the tag on the right side of the trans has the model number that will tell if the trans is direct drive or over drive.
What does the gear pattern on the sun visor show.
There's usually a tag on the front of the axle tube that list the gear ratio it has, on some Eaton's it's hand stamped on the front of the 3rd member.
Also the tag on the right side of the trans has the model number that will tell if the trans is direct drive or over drive.
Logistics Pro
Joined: Dec 2003
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From: Foothills of NC
With those 6 spoke Dayton wheels, that truck is built for heavy work. Your axles should have a tag with the ratio on them somewhere. It will be appx 1"x3". According to whatever the tag on the passenger side of the transmission reads, you should have either an RT or an RTO as the prefix. Could possible be an RTX. That tag is easy to find. Just look on the side of the transmission, passenger side. With the transmission tag, I can look up and see what ratio rears you have by the rpms and road speed.
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Joined: Mar 2012
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So, one of the issues I found with this truck during a WET harvest is that the diff doesn't seem to lock. When locked, both axles on the drivers side spin, but not the passengers side. Is this normal? Being it's my first year with the truck, I don't know what to expect. Thanks for any replies.
Cargo Master
Joined: Dec 2015
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From: Harned, Ky
That's normal, the inner lock or power divider acts like a transfer case in a 4x4 pickup, it locks the front and rear diffs together but if they don't have some type of locker or positrac carrier only one side on each axle will spin.
Very few big trucks came with positrac carriers but some came with a air activated locking device to make both sides pull at the same time.
Very few big trucks came with positrac carriers but some came with a air activated locking device to make both sides pull at the same time.
Logistics Pro
Joined: Dec 2003
Posts: 3,778
Likes: 867
From: Foothills of NC
As posted above, that's how a power divider works. The truck I drive now has power divider and locking axles. It sure is nice to have all eight tires pulling at one time with some of the places I go. Needed it the past two days. Good to hear your truck is out and working to earn its keep.