KentT
Elite Member
- Joined
- Mar 31, 2005
- Messages
- 2,928
- Location
- Sevierville, TN
- Tractor
- 1993 Power Trac 1430 w/Kubota diesel engine
J_J said:I would expect to see more torque, and less speed. How will you measure the torque? Do you have a steep hill that you could not climb with the old wheel motors?
I do have a question. If you have not changed out the tram pump, then you are pumping the same volume of fluid, have you really gained anything? I am thinking that the new motors will not be able to reach their maximum potential, based on the stock pump limits. In essence, the pump is pumping like crazy, and the wheel motors are just loafing along. In order to get maximum potential from the new wheel motors, a new pump would have to be matched to the new wheel motors.
JJ, I have several hills I can't climb, under load, when the hydraulic oil is warm. Though the engine is rated to 25 degrees, I think the wheel motors "poop out" at somewhere between 15-20 degrees, especially when operating the front PTO...
I anticipate roughly twice the torque and half the speed, using the same tram pump. What I see is the tram pump being able to pump its max volume (now based on wear, etc.) rather than perhaps being limited by pressure in the circuit due to the resistance of the wheelmotors. I see the end of bypassing in the wheelmotor circuit. I expect the ability to climb my slopes under load, regardless of oil temp, and likely even at less than full throttle. I'm "old school," even with air-cooled motors, and prefer to operate them at the peak of their power/torque curve, not full throttle. On my Kohler, the "sweet spot" seems to be somewhere around 75-80% (just guessing) throttle, with the engine probably running 2800-3000 RPM, not 3600 RPM at full throttle. I use full throttle only when running the front PTO (and need max output there) or when I need to try climbing those hills. I try not to lug the engine down, regardless of throttle setting -- that's what really makes them overheat fast (or at least that's my experience with air-cooled, high-performance VWs.
IMO, the current engine would not drive a larger tram pump to its full capacity, so that would be a waste...
Though I'll be doing it hydraulically, I anticipate the equivalent of putting a 2:1 reduction gearbox in a mechanical drivetrain.
We'll see...