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Re: Re: Re: Super A-making hydraulics stronger-log
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Posted by Hugh MacKay on March 07, 2004 at 06:07:18 from (209.226.106.57):
In Reply to: Re: Re: Super A-making hydraulics stronger-log spl posted by Don Green on March 07, 2004 at 05:33:16:
Don: I am not a hydraulic expert, but having used a lot of hydraulic in my day, speed of the pump is definately a factor to consider. When you get into big tractors with 10 to 18 gpm pumps, you can notice big changes in speed of hydraulic function between idle and full throttle. I know a guy with a wood splitter and using tractor pump of 230 he had to run tractor at full throttle and the splitter was still quite slow. He added a pto pump and now he has all the speed he wants at half throttle. While I say I'm not an expert, this hydraulic speed is not rocket science either. If you figure the bore size of your hydraulic cylinder, you can come up with the gallons or part thereof for a stroke of the cylinder. Pumps will give you a gpm rating based on a selected speed. Presure will slow this function only marginally. So do the numbers, find out your shaft speeds at the throttle speed and go from there. Most hydraulic shops can help you with this and even match up and sell you what you need. I would shy away from used pumps, unless it is awfully cheap. Even then you probably just get what you pay for. I had a hydraulic pump for a truck hoist given to me once, it was not cheap.
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