DK 45 Hydrostat tranny

[RJJR]

Hey folks,
I recently purchased a DK45 HST and have a question about the characteristics of this transmission. The only other experience I have with Hydro is in my John Deeer lawn mower and they act differently. How should the tractor respond if i hit the hydro quickly and all the way forward or backwards.

Mine doesn't respond as quickly as my mower does. It seems to "wind up" for lack of a better way to describe it. In other words it accelerates slowly but surely. The mower on the ther hand pretty much jumps to full speed. I tapped the pedals lightly and it will roll forward or backwards an inch or two quickly so its not like a clutch when it's burnt up. It doesn't have any play.

Do any of you fish? Another example: Some trolling motors accelerate smoothly to full speed so they don't throw you out of the boat while others accelerate almost instantly to full rpms. This feels like a steady progression to full forward or reverse.

The tractor is definately accelerating slower than my mower. Is this normal?
Thanks

 

[grsthegreat]

In mid range my DK45 accelerates rapidly; however in high range there is a lag. I get better response if i ease into the pedal in either range.

A hydrostatic transmission has the most torque with the least amount you push on the peddle.. So i generally always gently accelerate. This is a true hydraulic drive not like some belt driven hydro lawnmowers.

 

[MotorSeven]

What RPM's are you running? Generally I am up around 2300, no too much lag on level ground.

 

[RJJR]

What RPM's are you running? Generally I am up around 2300, no too much lag on level ground.

Different rpms. I'll try it tomorrow at 2300 and see how it feels.
thanks

 

[Hard Knocks]

Your Kioti HST has a relief valve that dumps excess pressure to protect the system when you stomp the peddle where your lawn mower does not. The mower will either lurch forward, stall the engine or spin the tires.

 

[wallace]

Do not operate your tractor like this. You will damage it.
You should never "stab" a hydro drive system.

 

[SSdoxie]

Your DK45 also has neutral valves that meter the initial flow of oil when you stroke the pedals to keep the tractor from lurching. it is designed to make a smooth transition from neutral to forward or reverse.

 

[IndyIan]

Do not operate your tractor like this. You will damage it.
You should never "stab" a hydro drive system.

What happens when you let off the pedal quickly? My tractor seems to slow the hydro at a specific rate, which seems to be fine on gravel in 2wd but I could see someone jackknifing towing a trailer in 2wd on grass for example.

 

[Coyote machine]

Lawnmower to tractor is like bicycle to car, they're totally not the same.
Steady even pressure applied to accommodate the task at hand will get you better results. As you gain experience you will know when to let off the pedal slightly to gain more speed. It's counter-intuitive but it's how it works. No wheelies, guaranteed!

 

[RJJR]

Ok so it sounds like its operating properly and its the operator that needs adjustment. Can do.
Thanks

 

[steve0413]

What happens when you let off the pedal quickly? My tractor seems to slow the hydro at a specific rate, which seems to be fine on gravel in 2wd but I could see someone jackknifing towing a trailer in 2wd on grass for example.

Mine will throw you in the floor if you aren't buckled. I've had my cruise control on more than once and switched it off before I had my foot on the pedal and it is a very sudden stop.

 

[Coyote machine]

Mine will throw you in the floor if you aren't buckled. I've had my cruise control on more than once and switched it off before I had my foot on the pedal and it is a very sudden stop.

I hear you on that aspect! What speed (RPMs) and gear are you crusin' at when you attempt to fly ahead of the tractor?!
I've noticed too that trying to stop quickly for whatever reason when cruise is on is difficult, obviously, and I try to get to the switch before I need to slow down or stop, or at least reduce RPMs and then shut off the switch. It is an easier motion to slow RPMs than to try to hit the switch due to it's somewhat awkward location. At least those are my observations from 600 hours on Kioti hydrostats with cruise control.

 

[Coyote machine]

Ok so it sounds like its operating properly and its the operator that needs adjustment. Can do.
Thanks

We can arrange to send some guys out to effect the OP adjustment!?:laughing:

 

[grsthegreat]

I hear you on that aspect! What speed (RPMs) and gear are you crusin' at when you attempt to fly ahead of the tractor?!
I've noticed too that trying to stop quickly for whatever reason when cruise is on is difficult, obviously, and I try to get to the switch before I need to slow down or stop, or at least reduce RPMs and then shut off the switch. It is an easier motion to slow RPMs than to try to hit the switch due to it's somewhat awkward location. At least those are my observations from 600 hours on Kioti hydrostats with cruise control.

On mine if i tap on the brakes the cruise control disengages. doesn't this occur on yours?

 

[Coyote machine]

On mine if i tap on the brakes the cruise control disengages. doesn't this occur on yours?

Probably, I'll have to verify- I usually use the methods I described instead of braking....

 

[SSdoxie]

On the DKs with electric cruise control, the brake light switch is routed into the control unit so when you apply brake, signal from the brake switch shuts the cruise control off.

 

[IndyIan]

Probably, I'll have to verify- I usually use the methods I described instead of braking....

Yep, just touching the brake disengages the cruise and I try to have foot resting on the hst pedal so there's no sudden braking.

 

[MotorSeven]

I carry a lot of big loads of lumber on the forks up to my house site almost a half a mile a way & part on the pavement. To keep from jerking the load when coming off of High Range cruise I first cover the hst pedal(light pressure) with my foot, then disengage the cruise by tapping the brake. If you just tap the brake, the machine slows down way too fast, so learn how to feather the pedal.

 

[steve0413]

I carry a lot of big loads of lumber on the forks up to my house site almost a half a mile a way & part on the pavement. To keep from jerking the load when coming off of High Range cruise I first cover the hst pedal(light pressure) with my foot, then disengage the cruise by tapping the brake. If you just tap the brake, the machine slows down way too fast, so learn how to feather the pedal.

Exactly. That's what I normally do, but a few times I've failed to cover the pedal. It will wake you up when the steering wheel contacts the groin area.
:confused2: