Attacking that power problem CT225

[dfkrug]

Here is something to think about:
I have lots of seat time (and wrench time) on 4 different HST tractors.
From the service manuals, my JD955's HST used 6000-6500psi RVs, and
my JD4300's HST uses 6000psi RVs. I no longer have my B21 service
manual. :-( That tractor is the only HST I have ever operated that would
stall the ENGINE in LOW range. ALL tractors I have owned or operated
with GEAR trannies could spin tires in LOW range....that is not the issue
here. Since I do a lot with installing backhoes, all these HST units are
operated with very heavy ballast. The low 5000psi RVs on the DaeDong
machines seems too low, based on my limited experience with other HST
tractors.

Has no one on TBN purchased a service manual for any of the Bobcat
CUTs?

 

[VictorW]

I have pulled a 6ft box blade also with no issue in mid range. I do not consider that a fair test. If you have some solid ground like a good dry field, put your loader against a tree, put her in low, rev her up and see if you can spin the tires. Mine can't, my dealers can't, I am curious if you a 235 can.

I have a Kioti CK30hst which I believe is the CT230. On hard dry dirt ground, in 4wd, diff lock, and at 2500rpm, it will stall in medium range if I push the bucket into something that doesn't want to move like a hard dirt pile. In low range, it will spin the tires if the bucket can't cut into the dirt. I've even spun them on an asphalt driveway trying to dig out hard dirt while in low range. I have R4 tires not loaded. The gear tractors do seem better at transmitting the power. Even the pto hp is a little higher with a gear. Sorry this doesn't help find your problem. Just advising how my tractor is for power and hst tranny.

 

[lilranch2001]

I plan on it when I have to start doing my own service, but I am going to let the dealer do the 50 hour service

 

[bbse]

I have a Kioti CK30hst which I believe is the CT230. On hard dry dirt ground, in 4wd, diff lock, and at 2500rpm, it will stall in medium range if I push the bucket into something that doesn't want to move like a hard dirt pile. In low range, it will spin the tires if the bucket can't cut into the dirt. I've even spun them on an asphalt driveway trying to dig out hard dirt while in low range. I have R4 tires not loaded. The gear tractors do seem better at transmitting the power. Even the pto hp is a little higher with a gear. Sorry this doesn't help find your problem. Just advising how my tractor is for power and hst tranny.

Perfect...that is what I was looking for. The fact that your relief valve doesn't open before your tires spin in low range is what I would expect from a 27-30HP CUT. Mine will not, it will pop the RV every time unless it is loose dirt. I am talking with the Bobcat service manager and I will pass this info on. Thanks.

 

[DKXJ]

I think its a simple concept. In low range, either the tires should spin, or the engine should stall.

 

[SPYDERLK]

I think its a simple concept. In low range, either the tires should spin, or the engine should stall.

How about this? ... If you continue to increase pedal fhe tractor should either move or spin or stall, regardless of range. If you cant stall the engine with the pedal there is no way youre even coming close to getting its HP to the ground before the relief pops and just throws all that power back into tke sump.
larry

 

[VictorW]

Perfect...that is what I was looking for. The fact that your relief valve doesn't open before your tires spin in low range is what I would expect from a 27-30HP CUT. Mine will not, it will pop the RV every time unless it is loose dirt. I am talking with the Bobcat service manager and I will pass this info on. Thanks.

I'm happy that helped a little. I've had my CK30hst for almost five years now with around 400+ hours. It seemed a "little" stronger as it hit the @100 hour mark, but so slight of a change in that it wouldn't give your's a big enough transformation from the way you explain it now. From most of the members at the Kioti site, it was the engine breaking in and giving me the full hp. I'm not sure that the hst actually breaks in as an engine does.

I've never measured any of my pressures. I hate to mess with something when it's working good. Even my fl seems strong. Most people and some excavation guys are surprised at what it will lift. I hope you get your problems figured out. Whether painted white or orange, they are nice tractors. (When working properly!)

 

[lilranch2001]

ok, I was heading out to the road tonight in high range and was thinking about this thread, I was going out to cut the hump along the road out. So when I got there, I left it in high range, about 2000 rpms, and put the bucket down and tried to cut into the 8 inch high hump, it rapidly lost rpms, and stalled the motor. I started it and took the RPMs all the way up , back up a little and hit it again, it made it almost through the 8" x 2 foot hump before it killed the motor again, the RV never dumped. It also did not spin the tires, but I was on asphalt with loaded rears.

 

[CT230 Fan]

Tonight I was mowing the grass for the first time this year. I don't have a lot of hills, but I do have a pretty steep hill on the road right of way. With my 6' finish mower and front end loader, I put it in high and proceeded up the hill. I'd had the hill is 30+ degrees. In high, it just dumped back to tank and I couldn't go forward. I shifted into Mid, and climbed right up the hill no sweat.

 

[SPYDERLK]

Tonight I was mowing the grass for the first time this year. I don't have a lot of hills, but I do have a pretty steep hill on the road right of way. With my 6' finish mower and front end loader, I put it in high and proceeded up the hill. I'd had the hill is 30+ degrees. In high, it just dumped back to tank and I couldn't go forward. I shifted into Mid, and climbed right up the hill no sweat.

... ? :confused2: ? ...