Attacking that power problem CT225

[dfkrug]

I posted the wrong HST RV pressure for the CK25/30. (I think the 5000psi
number was from the B21....oops.)

From page 4-37 of the CK25/30 service manual, it is:
280 kgf/cm2, which is 3980psi

For the CT225/CT230, KRAZK reports that the HST RV is also 280,
while the CT235 is 300 kgf/cm2, or 4260psi. CANADA_CT230
reports the CT225/230 to be 4061psi, while the CT235 is
4351psi. I imagine there are two different parts of the
service manual where these specs are reported?

I am still waiting for a report on the CK35 RV spec. I will post
all these in my CK-CT comparison thread.

Initially, it seems that buying the CT235 RV and putting it
into lower-powered M27s is a good thing to try. I wonder
what the M24s use (DK35/CT335).....

 

[bbse]

Spoke with the service manager today at Bobcat Nashville. He tells me that he is working with a engineer at Doosan to find a way to up the relief valve. The CT235 does have a higher pressure valve but it also has a different body size and thread. He is having them build one for him....I get to be the guinea pig on this one.

 

[lilranch2001]

congratulations (maybe) good luck! :thumbsup:

 

[tinman955]

I hope that is the solution, you might go from no spin, to just stall the engine. I feel the engines lack power, gearing not correct and relief settings to low.

How to fix im not sure but I do know the only way to fix them or improve them is to atleast try, im glad yr heading in the right direction.

 

[SPYDERLK]

I hope that is the solution, you might go from no spin, to just stall the engine. I feel the engines lack power, gearing not correct and relief settings to low.

How to fix im not sure but I do know the only way to fix them or improve them is to atleast try, im glad yr heading in the right direction.

2-300 extra psi would let him climb and restart on that hill he cant restart on.
Stalling wont be an issue at partial pedal because hes only pumping a little fluid. The key is that he wont be wasting it out the RV.
larry

 

[bbse]

2-300 extra psi would let him climb and restart on that hill he cant restart on.
Stalling wont be an issue at partial pedal because hes only pumping a little fluid. The key is that he wont be wasting it out the RV.
larry

This is what I believe also. I took the loader off yesterday to do some mowing. Up until now I have been leaving it on as I needed it to often to be taking it on and off. I can actually climb and mow the shallower sections of the back hills without popping the relief valve. But that is a short section. As soon as it steepens slightly I lose the valve but I can still keep the rpm's. I don't know how much more pressure it will take but I am going to stay after them until I can spin those tires. I figure that ought to be enough.

As to power, I hit 72 hours and it is starting to get a little more pep. I expect it is almost to full power now, it is a lot better than it was new. I had the same experience on my 3054 after I rebuilt the engine. It takes a while to break in and get all the power out of it.

 

[dfkrug]

Spoke with the service manager today at Bobcat Nashville. He tells me that he is working with a engineer at Doosan to find a way to up the relief valve. The CT235 does have a higher pressure valve but it also has a different body size and thread. He is having them build one for him....I get to be the guinea pig on this one.

That's interesting. I would love to hear the results.

Can we assume that he checked the RV pressure and got something near
the 3980psi spec? And that he has seen the two different RVs side-by-side
to state they are different body sizes?

I did not do the HST pressure test on any of my units....my guage only
goes to 4000psi. I need to get another gauge first. The test port is
on top of the gearcase below the front lip of the seat.

 

[tinman955]

Is the HST pressure adjustable like the loader valve is?

 

[dfkrug]

Well, for those interested, I removed the forward RV from my HST. The
adjuster screw in it is fixed in place with a tiny weld. It IS adjustable if
you grind the weld off, then reweld to secure it. I have posted a new
thread:

http://www.tractorbynet.com/forums/...increase-hydrostatic-transmission-relief.html

You can see from pix I posted that the RV itself has no threads on it, but
if the one for the CT235 or CK35 has a larger diameter, it will not fit. I
doubt the part would cost much, or one could just buy an RV for the
CT225/CT230 and modify IT, rather than the original one. Gotta get the
guage first.

 

[socketcap]

BBSE I have a 2008 ct230 with the exact same problem over here in NH, did you ever discover the source of your diesel engine running out of rpm and torque and eventually stalling?