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Truck PTO question

N

notjustair

Well-known Member
George's post below got me to the thinking of something to ask the brain trust.

I took a load of beans to town yesterday in the old 58 GMC grain truck. I was dreading it because that lift is slow anyway and gets really bad when it is cold. I think it was probably sized for one cylinder and it is a dual cylinder lift. It is the original to the truck. I've added galons of modern fluid to it over the years but never pulled it apart and cleaned the pickup screen. That is this winter's project.

It is four miles to town. I was tempted to engage the pto and drive to town with it on and see if that thinned the hydraulic a little. I read in the original book for it that it should not be run over 1000 rpm. What does the output on the transmission gear it to? I don't ever wind up the engine when dumping because it doesn't seem to help and I don't know what the rpm would be. The old pump leaks enough as it is - I don't need to make that input seal any worse!

Are all of the old transmissions geared to have the same output on the PTO? Is it 540 like the tractors? Sure doesn't look fast with the truck idling.
 
I assume it has the old drive shaft style drive. If it does DO NOT RUN IT going down the road. You will be picking up parts the whole way. If you do get to the elevator and there is a line turn it on and let it run. Keep the pick up screen clean .
 

With PTO engaged you will have problems with shifting and the risk of raising the box when you should not.

Pull the proper maintenance and fix the leaks. Most dums I have run do not need more than half throttle and will dump at an idle given enough time.
 
I believe if you drive that truck with the PTO enguaged youll blow the PTO Gears out the side of the transmission. Ive seen this happen before on a job site years ago.
 
Truck PTO speed is a fraction of engine speed, I don't believe there's any "standard", it depends upon the tranny/PTO unit combo you have..

When you look in PTO catalogs for a PTO for a specific transmission, the gear ratio is shown. (Between engine speed and PTO speed.)
 
You likely won't hurt the PTO, but you will kill the pump. If it's a Del/Ebro/Carter pump it'll definitely grenade in 4 miles . A Muncie or a Commercial Shearing would survive it on a 3 line system, otherwise they have kittens quickly too
 
Pto's are not all the same output is a percent of engine rpm , it dependes on the precent installed. I have seen them from 50% to 110%. Meaning if you have a 50% pto and idle at 800 rpm the pto turns 400 rpm a 100% 800 at 800 rpm. All depends on use so without knowing tran model and pto model no telling speed
 
With our tow trucks in the winter, we start em, kick the ptomin ald let the truck warm up a while. If you run the deck or winch cold, its a good way to blow hydraulic lines. Nothing more fun than trying to replace a line on the side of the road in the winter with a half loaded car.
 
You wouldn't be able to shift the transmission easily if you had the pto is engaged while driving. The resistance from the pump on the PTO shaft will slow down the cluster gears inside the transmission and any synchronizers in the transmission would prove useless. I'm talking from experience. I left the PTO engaged by mistake/forgetfulness several times on a tanker truck when I use to spray fields.
 
Do not drive with PTO engaged!Engage pto when you first start the truck in the morning and warm both engine and hoist for a bit. Then disengage pto while you drive to the elevator.Then engage pto while waiting in line at the elevator.That will warm things up well.You're running the engine and the heater anyway.....
 
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