GPM/PSI for Cessna hydraulic pump # 245600?

handytravis · Dec 5, 2020

I have an older model New Holland L35 that has been repowered with a Yanmar 3TNE82A-AF of about 29hp I believe. Boom up/down and tilt all seem very strong; as does the hydrostatic pumps in forward and reverse. The one problem I have is the motor wants to stall if I try to jam one stick forward and the other backwards to the stops. Not saying I would always operate the machine like this, but its nice to know the option is there

I am considering installing a Kubota V2203 DI from an refer van to bump up the available power so the hydrostatic transmission's don't stall and to have the option to plumb in auxiliary hydraulics in the future. I can't seem to find the hydraulic specs to see if I will be putting in too much motor in this machine and/or if the hydraulics can handle it. From what I can find is this Hydraulic pump was also used in the larger machines that New Holland produced (L775).
I think I saw something about 9gpm? but no PSI.
Would I mess up anything by plugging in the larger motor?

Thanks for the help!

Dave M7040 · Dec 6, 2020

handytravis said:
I have an older model New Holland L35 that has been repowered with a Yanmar 3TNE82A-AF of about 29hp I believe. Boom up/down and tilt all seem very strong; as does the hydrostatic pumps in forward and reverse. The one problem I have is the motor wants to stall if I try to jam one stick forward and the other backwards to the stops. Not saying I would always operate the machine like this, but its nice to know the option is there I am considering installing a Kubota V2203 DI from an refer van to bump up the available power so the hydrostatic transmission's don't stall and to have the option to plumb in auxiliary hydraulics in the future. I can't seem to find the hydraulic specs to see if I will be putting in too much motor in this machine and/or if the hydraulics can handle it. From what I can find is this Hydraulic pump was also used in the larger machines that New Holland produced (L775).
I think I saw something about 9gpm? but no PSI.
Would I mess up anything by plugging in the larger motor?

Thanks for the help!

My first guess is that the skid steer drive system is a closed center one designed for variable displacement pump and you are running it on a fixed displacement pump.

You need to fully understand the hydraulic systems before just adding more power. If my guess is correct, keep going like this and soon the pump will fail.

Find someone who understands the L35 systems.

Dave M7040

oldnslo · Dec 6, 2020

Are you talking one drive lever full forward and other full reverse. Depending on traction or friction to turn this could require more power than your engine can produce. Not uncommon for hydrostatic drives to pull more power than engine generates.

If you push into a pile of dirt and try to drive full speed in good traction does it stall the engine

Older skid loaders used gear pumps for loader functions as well as some new ones so doubt open vs closed center is problem but if trying to run loader while turning or pushing will definitely require more power

handytravis · Dec 6, 2020

Yes, one lever full forward and the other full reverse stalls the engine- even on snow covered icy ground. I haven't had a chance to push into dirt with good traction at full speed as everything is frozen. This is a gear driven pump on this machine. Feels like it bogs at about half sticks, then if I go full- it kills the engine at operating RPM (~2400)

oldnslo · Dec 6, 2020

Does it sound like engine is straining when not moving? Reason for asking is that if something in the loader hydraulic circuit is not returned to center or home position properly that circuit will then draw extra power all the time. I know skid loaders are a challenge to work on but is there any way to install a gauge in the pressure line of the gear pump feeding your loader valve. This would provide information on that portion of the system.

If you move just one lever to drive forward or back does one side take more powers than the other? If yes then possibly that side has some binding in the drive system between the hydraulic motors and wheels.

handytravis · Dec 6, 2020

It does not sound as if it straining when not moving, idol's great. One side does not require more power than the other to operate. I think it is just underpowered. I got this in non-running condition and someone else installed a Yanmar 3TNE82A-AF- I believe it's 29hp. I was thinking of repowering, but now I think I may be able to put a turbo on it and increase fuel to bump up the HP? Any thoughts on the correct turbo combo for this engine and what HP I can expect? I am obviously new to diesel power, but now I want to put a diesel in everything!

oldnslo · Dec 6, 2020

According to specs I found online original motor was 37 HP Wisconsin so if current engine is 29 HP you did lose around 20 percent of engine power. Other question is do both engines run at same RPM since higher RPM produces more flow which requires more power

handytravis · Dec 7, 2020

I believe that Wisconsin motors peak power rpm is about 2400, this yanmar motor runs 24-2800 rpm.

oldnslo · Dec 7, 2020

Handy,
If engine speed went from 2400 RPM to 2800 RPM that would be an approximate 15 percent increase in speed so also approx 15 percent increase in power required to operate at full speed. That on top of the 20 present loss in power and I would say yes you could be a little under powered if trying to operate at full speed.

Partial speed you should be fine though.

handytravis · Dec 7, 2020

and that's what I am currently seeing- about half sticks it will work and I can feather it without stalling the engine, much more than half and it will stall the engine. So I am thinking TURBO!!! If anyone has suggestions on the one I should get with a paltry budget in mind, please share! Thank you all for your time!