Need advice on my kioti

[Citydude]

Thread pruned again...

Thank you.

 

[MossRoad]

The premise of your statement is correct, however, to avoid confusion on another topic, I would like to point out that "variable displacement " pumps are only used on closed center hydraulic systems.

Most tractors under 50 hp use open center systems with a constant displacement pump.

Again, just to avoid confusion on a topic that come up frequently.

To reinforce what you said.....

More hydro pedal equals more speed less torque
Less hydro pedal equals less speed more torque.

Here's a video of the insides of a Kubota BX series transmission. It's got a swash plate in it's pump. I'm fairly certain that it is a variable volume pump. I might be incorrect... I thought I was once before, but I was mistaken.....

 

[K man]

1300 feet up in 1 mile is a 4:1 incline. For every 4' forward you are going 1' up.

A 1:1 slope is 45 degrees, and 100% grade.
A 2:1 slope is 22.5 degrees, and a 50% grade.
A 4:1 slope is 11.25 degrees, and a 25% grade.

That is a very steep angle and grade to try to go up in high range and hold speed.

One thing I didn't see you write was what you are doing with the throttle. Several people asked if you have it at full throttle or not, but I did not see the answer.

My throttle is fully open all the time when climbing or bucket work. Also like to mention that the hills that I climb are not straight up from ground level to 1300 ft. There are a couple of flat spots on the hills in between the steep grades which helps the tractor catch up on some speed a little but still takes forever to get to the top.

 

[the old grind]

Referring to my '98 Terramite T5C, its pump is fixed displacement ie: it has no swash plate, and the Cessna 'torquemotor' is variable displacement/volume.

It should seem perfectly logical that, conversely, a variable displacement pump could drive a fixed displacement motor. (good point, Moss. ) I wouldn't be shocked to see both in the same machine.

Once again, we have a reason to expect different performance if machines of similar hp don't use the same system.

btw, Terramite's 'single range' configuration limits ground speed to little more than a walking pace at WOT and 'full pedal' on the HST. Also, its whine can be heard half a block away and sounds like something is terribly wrong. That said, 12 years on mine drives as well as when I bought it.

 

[Fuggley]

I never even try now to travel up hill in H or M with my CK30Hst/backhoe attached.. why bother?... I know it will bog down as let up on the trans pedal anyway. So I just sit back and crawl up hills in low... it’s safer and helps my high blood pressure to enjoy the ride up.

 

[Egon]

that implies the transmission slips. compare that effect to a geared tractor, the transmission don't slip, and just bogs down the engine instead if you're in too high a gear.. automatic transmissions have been designed for decades without slipping but a tiny bit..

Are you familiar with HST??

 

[MossRoad]

Referring to my '98 Terramite T5C, its pump is fixed displacement ie: it has no swash plate, and the Cessna 'torquemotor' is variable displacement/volume.

It should seem perfectly logical that, conversely, a variable displacement pump could drive a fixed displacement motor. (good point, Moss. ) I wouldn't be shocked to see both in the same machine.

Once again, we have a reason to expect different performance if machines of similar hp don't use the same system.

btw, Terramite's 'single range' configuration limits ground speed to little more than a walking pace at WOT and 'full pedal' on the HST. Also, its whine can be heard half a block away and sounds like something is terribly wrong. That said, 12 years on mine drives as well as when I bought it.

My PowerTrac PT425 (25HP gas engine) has a variable volume pump that drives 4 wheel motors of fixed displacement.

My old IH2500b tractor loader (50HP gas engine) had a variable volume pump that drove 1 fixed displacement motor that drove the transmission through a 2 speed range selector.

 

[Tigershark]

I had a CK4010 for over 2 years, I never experienced any issues in High gear, in fact I could mow a field in High gear with my bush hog and didn't have any problems, it had plenty of power, I have plenty of hills on my farm and could get around fairly easily going up them in both H and M, sometimes it would whine a little to start but would pick up speed and do fine in H. Nothing over 20% grade.

 

[MichiganIron]

Sounds too simple to be true...but have you checked to make sure one (or both) of the brake rockers aren't stuck?? Gotta start with the simple stuff...we have seen this happen before and rob the tractor of power. Check the rockers on the rear brake cases and make sure they are both dis-engaged. If stuck, spray penetrating oil where the rocker shaft goes through the brake case, and keep working it until it moves freely. Partially stuck brakes...simple stuff.

The KIOTI HST units are variable displacement pumps / fixed displacement motor units. The Swash Plate varies the displacement of the HST Pump. The pressure relief on the CK30 Hydrostat Unit (NOT the tractor hydraulics) is 4100psi. If the internal HST pressure reaches the relief pressure, you will hear the HST unit squeal...pressure relief opening. So, if you are hearing a squeal when the tractor "bogs", most likely the HST unit, which could be caused by stuck brakes or too high of a range selected. If the motor "bogs", probably start looking more towards Engine/Fuel issues.

The CK Tractors are pretty heavy machines. They did not climb well, especially in high gear.

Hope this helps

 

[JimR]

I had to laugh while reading some of these posts. Here is what my Ford 8N would do going up my 24% grade hill. I had to use 1st gear to climb it. My 1997 Cub Cadet 7275 27HP tractor could only climb this hill in low gear, it was hydrostatic. My NX4510 HST will only climb this hill in low gear at WOT and that is a 45HP machine. I can baby it up that hill in M range if I really wanted to by babying the foot peddle. I see no reason to load up the machine that much to make it work hard to do what it can do much easier in a lower gear. You own a tractor, it is not a race car.