MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 57,982
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
Re: my new tractor manual vs hydro
I think you've got it /w3tcompact/icons/smile.gif. However, the engine does provide braking, because it provides the movement of the fluid. I can't explain it well, so I dug out the manuals for my IH2500b(4cylinder gas engine, hydrostatic transmission, hi-lo range transmission, independant PTO rated at 50HP). Here's what it says in the operator's manual on page 22(if you have a book):
"Greatest efficiency of entire tractor, loader, and backhoe is at 2000 engine RPM and up, depending on desired speed of tools... the tractor forward and reverse travel speeds are controlled by range movement of the foot pedals or the Remote Drive Control Lever.
When pedal is not depressed, the transmission is in a locked or braked position.
Maximum torque and slowest travel speed is obtained with the least downward movement of the pedal.
Example: The least possible depression of the pedals will give you the slowest speed with the greatest torque to the drive wheels for digging or crowding into the stock pile or bank.
Using the tractor brakes is rarely required because:
As your foot moves upward from the hydrostatic pedal you are automatically decelerating your travel speed... and when your foot moves completely off the pedal, the pedal returns to the neutral or lock-up position and automatically brakes your transmission and travel."
It goes on on the next page to read:
"The hydrostatic transmission is designed so that: In high range the travel speed deceleration is less abrupt(slower) and the braking is more cushioned to prevent abrupt automatic braking."
"The cushioned braking and travel speed deceleration is timed with the automatic pedal return(or full-up position)
This definite time differential is designed into the system to not only provide the travel speed deceleration and cushioned stop but prevents accidental reversal of direction by the operator."
This is the part about the engine providing control at all times, which would include braking.
"The operator accustomed to mechanical or torque converter equipped tractor may be in the habit of reducing the engine speed for more positive control when operating in close quarters. This is neither necessary nor desirable with the hydrostatic tractor because the higher engine RPM will provide more positive control of not only the hydraulic tools but also the travel speed and automatic deceleration and braking. Maximum performance and control is achieved with high engine speed."
Whew!!! That was a load to type, but I thought you all might enjoy reading it.
I think I also answered my own PTO question, as the PTO on my IH2500b is powered by gears from the transmission, which is driven by the hydraulic pump. /w3tcompact/icons/smile.gif
I think you've got it /w3tcompact/icons/smile.gif. However, the engine does provide braking, because it provides the movement of the fluid. I can't explain it well, so I dug out the manuals for my IH2500b(4cylinder gas engine, hydrostatic transmission, hi-lo range transmission, independant PTO rated at 50HP). Here's what it says in the operator's manual on page 22(if you have a book):
"Greatest efficiency of entire tractor, loader, and backhoe is at 2000 engine RPM and up, depending on desired speed of tools... the tractor forward and reverse travel speeds are controlled by range movement of the foot pedals or the Remote Drive Control Lever.
When pedal is not depressed, the transmission is in a locked or braked position.
Maximum torque and slowest travel speed is obtained with the least downward movement of the pedal.
Example: The least possible depression of the pedals will give you the slowest speed with the greatest torque to the drive wheels for digging or crowding into the stock pile or bank.
Using the tractor brakes is rarely required because:
As your foot moves upward from the hydrostatic pedal you are automatically decelerating your travel speed... and when your foot moves completely off the pedal, the pedal returns to the neutral or lock-up position and automatically brakes your transmission and travel."
It goes on on the next page to read:
"The hydrostatic transmission is designed so that: In high range the travel speed deceleration is less abrupt(slower) and the braking is more cushioned to prevent abrupt automatic braking."
"The cushioned braking and travel speed deceleration is timed with the automatic pedal return(or full-up position)
This definite time differential is designed into the system to not only provide the travel speed deceleration and cushioned stop but prevents accidental reversal of direction by the operator."
This is the part about the engine providing control at all times, which would include braking.
"The operator accustomed to mechanical or torque converter equipped tractor may be in the habit of reducing the engine speed for more positive control when operating in close quarters. This is neither necessary nor desirable with the hydrostatic tractor because the higher engine RPM will provide more positive control of not only the hydraulic tools but also the travel speed and automatic deceleration and braking. Maximum performance and control is achieved with high engine speed."
Whew!!! That was a load to type, but I thought you all might enjoy reading it.
I think I also answered my own PTO question, as the PTO on my IH2500b is powered by gears from the transmission, which is driven by the hydraulic pump. /w3tcompact/icons/smile.gif
