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Hydrostatic drive

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CAMPRO

03-19-2003 08:38:25




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I am looking at a 1999 D3C with hydrostatic trany. The price is really cheap. Could this be because the hydrostatic is cheaper to make, or do people not like this drive system. How exactly does the steering and braking work?




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Robert in W. Mi

03-19-2003 18:57:31




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 Re: hydrostatic drive in reply to CAMPRO, 03-19-2003 08:38:25  
If the price "is really cheap", i'd get the hydro tested to see if there's a problem. If there is a problem, it won't be cheap for long!! "CAT" and "cheap" don't go together!! Robert



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Deas Plant

03-19-2003 10:53:16




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 Re: hydrostatic drive in reply to CAMPRO, 03-19-2003 08:38:25  
Hi, Campro. With the hydrostatic drive, there are NO steering clutches or brakes. The 'transmission' is a set of hydraulic pumps which supply hydraulic power to a drive motor inboard of each drive sprocket. Steering is done by varying the hydraulic flow to the motors. I haven't been on a D3C so I don't know if you have hand lever or foot pedal steering but on the Cat 943/953 track loaders that I am operating these days, presssing a steering pedal down will reduce the flow to that track by an amount controlled by how far you press the pedal. At a certain point, the flow is completely stopped, making that track stop. Press beyond that point and the flow to that track is reversed making that track turn in the opposite direction and giving you 'spin' turns, meaning that the machine is literally turning on the spot.
Very handy in tight places --- so long as you are careful about it.
Up to the point where flow is completely stopped, both tracks are under full power while turning. It is simply the 'flow' that has been reduced to one track, NOT the power.
Hope this helps.
You have a wonderful day. Best wishes. Deas Plant.

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