I'm not sure if this is the right category post this so feel free to move it if it's not. First off, I have very minimal experience with wet kits so any information will be greatly appreciated. I am considering putting a wet kit on a 94 pete with a super 10 spd trans. It's only purpose would be to operate the hydraulics on a hyd detach lowboy trailer. I have a friend that pulls a live bottom trailer that has spare pump that he would give me (he upgraded to a higher volume pump). My question is are all of the PTO's the same or would I need to get one that was specific to my transmission? And are all PTO's 'geared' the same? My current lowboy has a pony motor on it and has wet line hook up's on it as well. So, until I trade trailers, this will prob be a backup to the pony motor. Thanks in advance for any advice.
Pto for a wet line pump
- Thread starter bam1968
- Start date
Truck Shop
Well-known member
As for a super ten I can't say that it's the same as others. I would assume it's a bottom mount not side mount. I would use a bottom mount.
And you can have a pto set-up for 10% over speed at idle, that works well because you won't have to increase engine speed. PTO's for
fuel trucks usually are set 10% under drive because gas going through a vein pump will cause chatter in the pump. The pto drive gear in
most Eaton's are the same in tooth count, but I would check on that super ten.
Truck Shop.
And you can have a pto set-up for 10% over speed at idle, that works well because you won't have to increase engine speed. PTO's for
fuel trucks usually are set 10% under drive because gas going through a vein pump will cause chatter in the pump. The pto drive gear in
most Eaton's are the same in tooth count, but I would check on that super ten.
Truck Shop.
I added a wet kit to our tractor for the exact reason that you describe.
I cannot be definitive about pto compatibility between transmissions, but I believe that most, if not all Eaton trans will accept the same pto. It sounds as if you will need to purchase that part anyway, so as long as you get one that will work for your trans you should be good. I believe that the rotation can be changed in the pto, as well as gearing, but where you will be purchasing this just find out the model number of your friends pto, and buy one similar.
You will need to know if your friend's pump is married to his pto, or separated and driven by a drive line as well.
Because your friend has used his on a live bottom trailer, the pump will have been set up for a two line system, which is what you will need. Most pumps can be plumbed either for two line, or single (for use with end dumps). The difference is primarily whether or not the fluid returns to the tank back through the pump, or returns to the tank via a separate return line, circulating all the time. You will need to get a diagram of how the hoses need to be plumbed, or just take a close look and notes of how your friends is plumbed, assuming his new pump and the one that he is giving you are plumbed the same.
Your friend will have either had a hydraulic oil tank/cooler (often used on systems like crude oil tankers) or a large hydraulic reservoir - 35 to 50 gallons. On ours, we put on a large hydraulic tank so that we could also pull a semi end dump, and have enough oil capacity to fill the end dump ram. In order to do this, we installed the valveing in the cab such as needed for the end dump, and when we use it for our lowboy we just have to put the valve in the lift position. This will allow fluid to cycle through your lowboy valveing and return to the tank.
If you never want the ability to pull an end dump, than this is not necessary.
On your lowboy you should have a diverter valve that you switch to run off of a wet line versus your pony motor. Make sure you check into this as well (per your lowboy instructions).
Plumbing diagrams are available through websites like Parker, and others that sell pto and pumps. We purchased a kit that included the pto, pump, filter base and filter, and tank, and then had the hoses made up after we measured for length and fitting requirements.
On the pto's, we have two types: one that is cable controlled, and one that is air regulated. I was leery of the air regulated one at first, as it not only engages the pto, but also controls the lift valve operation using air, but we have had no problems with it.
Another thing to mention is that we have a larger line going to the lowboy than the return. We did this to make sure we had enough volume to run an end dump (one line). The lowboy did not require that much volume, so we used a smaller diameter hose for the return.
We were constantly having issues with the pony motor and pump, or running out of gas at exactly the wrong time, and are really glad that we put the wet kit on. There is a fair bit of expense to add the wet kit, but I think you will be glad that you did.
Other folks on the forum will surely have more information for you, but in general, if you go to your supplier of wet kits and tell them what you are doing, they should be able to guide you through what is needed. The lower volume pump that you are receiving from your friend should work great for your lowboy!
I cannot be definitive about pto compatibility between transmissions, but I believe that most, if not all Eaton trans will accept the same pto. It sounds as if you will need to purchase that part anyway, so as long as you get one that will work for your trans you should be good. I believe that the rotation can be changed in the pto, as well as gearing, but where you will be purchasing this just find out the model number of your friends pto, and buy one similar.
You will need to know if your friend's pump is married to his pto, or separated and driven by a drive line as well.
Because your friend has used his on a live bottom trailer, the pump will have been set up for a two line system, which is what you will need. Most pumps can be plumbed either for two line, or single (for use with end dumps). The difference is primarily whether or not the fluid returns to the tank back through the pump, or returns to the tank via a separate return line, circulating all the time. You will need to get a diagram of how the hoses need to be plumbed, or just take a close look and notes of how your friends is plumbed, assuming his new pump and the one that he is giving you are plumbed the same.
Your friend will have either had a hydraulic oil tank/cooler (often used on systems like crude oil tankers) or a large hydraulic reservoir - 35 to 50 gallons. On ours, we put on a large hydraulic tank so that we could also pull a semi end dump, and have enough oil capacity to fill the end dump ram. In order to do this, we installed the valveing in the cab such as needed for the end dump, and when we use it for our lowboy we just have to put the valve in the lift position. This will allow fluid to cycle through your lowboy valveing and return to the tank.
If you never want the ability to pull an end dump, than this is not necessary.
On your lowboy you should have a diverter valve that you switch to run off of a wet line versus your pony motor. Make sure you check into this as well (per your lowboy instructions).
Plumbing diagrams are available through websites like Parker, and others that sell pto and pumps. We purchased a kit that included the pto, pump, filter base and filter, and tank, and then had the hoses made up after we measured for length and fitting requirements.
On the pto's, we have two types: one that is cable controlled, and one that is air regulated. I was leery of the air regulated one at first, as it not only engages the pto, but also controls the lift valve operation using air, but we have had no problems with it.
Another thing to mention is that we have a larger line going to the lowboy than the return. We did this to make sure we had enough volume to run an end dump (one line). The lowboy did not require that much volume, so we used a smaller diameter hose for the return.
We were constantly having issues with the pony motor and pump, or running out of gas at exactly the wrong time, and are really glad that we put the wet kit on. There is a fair bit of expense to add the wet kit, but I think you will be glad that you did.
Other folks on the forum will surely have more information for you, but in general, if you go to your supplier of wet kits and tell them what you are doing, they should be able to guide you through what is needed. The lower volume pump that you are receiving from your friend should work great for your lowboy!
Last edited:
After reading Truck Shop's post, you might want to make sure that the super ten accepts a pto. I assume it does, but have no experience at all with them. We have installed one on an RTOF 15618, and an RTO 15715 without any problems.
We idle our truck up to around 1,000 rpm when using it for the lowboy, but it is not necessary - just a bit quicker.
We idle our truck up to around 1,000 rpm when using it for the lowboy, but it is not necessary - just a bit quicker.
BoxCarKidd
Active member
Direct and different overdrive transmissions spin the counter shafts at different speeds related to the engine. If you get the model #'s off the pto and trans a good supplier can tell you if it's what you want. Pto's can have different drive gears, gear ratio's, and output shaft rotation. Some side mount, small hole, PTO's can be mounted on the bottom with an adapter. I normally prefer the bottom mount with a direct mount pump, all air shifted, and don't forget a rear hanger on large pumps. Be sure you have a relief valve.
Truck Shop
Well-known member
The tooth count on left counter shaft or for bottom mount 8 bolt pto is 47 teeth. the right side counter is 45 teeth. for all Eaton twin counter shaft
transmissions, except the 66 series. I posted Eatons pto chart and info below.
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_038259.pdf
Truck Shop
transmissions, except the 66 series. I posted Eatons pto chart and info below.
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_038259.pdf
Truck Shop
First off guys, thanks for the info and taking the time to reply. I am constantly amazed at the priceless wealth of information on here and HEF. About 3 months we pulled this about 3 miles to our shop. It had sat for 8 years and had not been started in 7 years. My dad (who is 70 yrs old) enjoys these little projects. Long story short, he seems to like the truck so we will probably keep it around for awhile and that is why I'm considering putting a wet line setup on it for the reasons Oxbow mentioned. I will crawl under it and get the trans model number so I can get the correct PTO for the trans and the donar pump. Correct me if I'm wrong, after I get the PTO/pump setup then I was going to mount a small holding tank and filter, an air shifter and required hoses. As I mentioned earlier it will only be used as a backup system to the pony motor on my lowboy. So I shouldn't need any valving??? My first thought was that I wouldn't need a holding tank since there is already one on the trailer. But it is pretty small and thought to be on the safe side I would put a small one on the truck. Thanks again for your help
You will need a pressure relief valve if the pump doesn't have one already, and for the bit additional cost I would add a secondary, broke parts are expensive. you don't need a very big tank on the truck for a hydraulic neck, I have one that worked with an aspen 80 ton, if you want a volume measurement. you might want to consider plumbing the pto air control so that the tractor park brakes have to be applied brakes to engage the pto. You also need to find out which pto hole you friend used to power the pump, the side hole usually needs an idler adapter to clear the housing so the output is usually backwards from the bottom hole pto. I don't see how it would be possible to get around using a divertor valve, unless you put quick connects on the lines from the pony motor so that you could un hook them and connect them to the pto pump, but it would probably be cheaper and easier to just install a 2 circuit diverter valve.
Last edited: