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Question concerning loader hydraulics

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Kevin

02-02-1999 18:43:40




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I'm planning to convert the loader on my Ford 801 to enable full hydraulic control. I am looking for advice on selecting the new components. The loader currently raises quickly enough but does not seem to have the power I would expect. Is this an indication of not enough pressure from the pump? Could it be resolved with larger bore cylinders when I replace them with the double acting ones? Any advice on the specs for the control valve(flow,pressure,relief)? Does the valve need load checks or a float? Any input on the requirements of a typical loader would be greatly appreciated.

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g chapman

04-01-1999 09:03:13




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 Re: question concerning loader hydraulics in reply to Kevin, 02-02-1999 18:43:40  
Kevin I'm new to hydraulics but here is what I have learned: If the loader raises fast enough increasing the cylinders will make it slower with the same pump. Because the fluid has to fill a larger space. If the fluid is so old it may not have enough viscosity to be pumped. The pump seals may be worn out causing a loss of preasure. See Al's reply for additional info. The control valve seals may be worn causing a loss of pressure. The seals in one or both of the loader cylinders could be worn alowing the oil to by pass the ram. Or as Al said the pressure releaf is addjusted low. Check the pressure with a gauge rated higher than the 2500psi you are looking for. Central Tractor has one 5000psi for about 20.00, but you will have to conect it in the line you are checking with adaptors. The new valve should have the check to lower loads without droping several inches when lowering. The float position will come in handy to follow the ground contours with out gouging the high spots. The only reason to go with larger cylinders is to increase the lift capasity which will need a larger punp and the loader frame may not withstand.

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al

02-05-1999 08:46:39




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 Re: question concerning loader hydraulics in reply to Kevin, 02-02-1999 18:43:40  
Kevin,
Most loaders can lift the rear [dry-tires] off the the ground. Check your relief valve, the proper
way to set it is with a guage [2500 psi]. Install it
in a pressure out line dead ending it to the guage.
You turn the adjusting screw in slightly push the
control valve [for a few seconds only !!!!!] read the
guage continue until you get the rated pressure
your looader is rated for. The relief valve is usually located on the control valve with a castle
nut covering a jam nut with a plain screwdriver
headed bolt. You may get into trouble wuth larger
cylinders tearing your frame apart,your pump may
be bad,but if it works quickly even when hot chances are its a relief valve setting.

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Wayne

02-03-1999 04:53:54




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 Re: question concerning loader hydraulics in reply to Kevin, 02-02-1999 18:43:40  
It may be more feasable to buy a used loader with the features you need. My preference is PTO pumps



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