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Tool Talk Discussion Forum

Hydrostatic??

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Jay87T

07-29-2005 05:43:33




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I know this sounds like a dumb question, but what is hydrostatic? like on a lawnmower. I have never delt with it before.




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Burnie

07-30-2005 04:59:27




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Also great for Cotton Pickers and Combines to vary speed in crop to suit conditions. You don't need to have a shaft between engine and transmission: engine can be mounted in any place (and direction) you want.



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Jay87T

07-31-2005 06:10:37




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 Re: Hydrostatic?? in reply to Burnie, 07-30-2005 04:59:27  
dont they still use people for picking cotton?



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TomWNC

07-29-2005 21:19:45




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Like the others said about the drive and speed control. My brother purchased a Craftsman a little over two years ago that is hydrostatic drive. It took a little bit to get used to letting off on the pedal to stop and pushing to go, still wanted to push the brakes. But , once I used it enough to get used to it, it is great.



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youngster

07-29-2005 21:14:53




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Think of this as an automatic tractor. easy as a car to opperate no guessing just push and go. the newer cub cadets have nice foot pedals to do this with it makes it real sweet to use



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Dick2

07-29-2005 11:27:47




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Hydrostatic systems are usually designed with a piston pump and a piston motor. When you move the speed control lever, it changes the angle of the wankel plate, which limits the length of stroke of the piston and changes the amount of oil sent through the system - which changes the speed. What a lot of people don't understand is that most hydrostatic systems are designed to be operated at full engine RPM and the control lever is to be used to change the ground speed, NOT the engine throttle.

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onefarmer

07-29-2005 07:24:39




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Hydrostatic drive is where the machine is run by Hyd instead of the usual gear/belt drive. A hyd pump runs a hyd motor controled by a variable valve to control speed and direction. Advantages are infinite speed control, instant direction change with out stopping to change gears, no gears to grind. Disadvantages oil driven, possible leaks, added heat, takes some extra power to run.



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TimV

07-29-2005 07:19:02




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 05:43:33  
Jay: the short answer is it's a hydraulic motor that drives the wheels. It allows infinitly variable speed, which is handy when you're mowing lawn or (on larger tractors) baling, roto-tilling, etc. where being able to vary your ground speed easily is a plus.



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Jay87T

07-29-2005 07:26:17




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 Re: Hydrostatic?? in reply to TimV, 07-29-2005 07:19:02  
so it has a hydaulic pump and it turns a hydraulic motor on the wheels? also does it power the blades too? or is that still done by the motor and belt.



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Joe(TX)

07-29-2005 07:36:27




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 Re: Hydrostatic?? in reply to Jay87T, 07-29-2005 07:26:17  
No. The blades are normaly ran like a mechanical transmission mover by a belt.



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