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Hydraulic schematics

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RockyMO

10-30-2006 19:52:07

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Hello out there in tractor land. I have to teach a group of kids how to read hydraulic schematics. I thought the N series tractor hydraulics would make a very good display and lesson plan. The problem is that I can't find the copies that I thought I had. I am not having any luck finding them on this site either. does anyone have some good schematics on these tractors that I could use?

Thanks in advance,
Rocky in MO

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Richard H.

10-31-2006 06:33:09

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Re: Hydraulic schematics in reply to RockyMO, 10-30-2006 19:52:07

Take a peek at this.

Peek

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ZANE

10-31-2006 05:33:52

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Re: Hydraulic schematics in reply to RockyMO, 10-30-2006 19:52:07

There is one thing that you may want to look into with the N hydraulics. That is the N pump is completely different from any other hydraulics known to man in that it is an "on demand" pump designed by the genious Harry ferguson to prevent overheating of the oil in the hydraulic system that other systems of that era were having. In the Ferguson system pump it only pumps when oil is required to raise the implement or to hold it at a given place and only then. This is accomplished by it having an intake valve that only allows enough oil into the pumping chambers to move the small amount required to hold an implement or to allow more to enter the pump chambers when more oil is required to raise the implement.

All other hydraulics other than farm tractors with Harry Ferguson's system or modificaton of the same have a constant oil flow and the implement or equipment is actuated by a control valve to direct the flow of oil to the device that is actuated by a particular control valve.

One thing you may or may not know is that the power or pushing power of any hydraulic system is a compromise between speed and power. The smaller the pumping volume the greater the pushing power of the device receiving the oil. A larger pump will be faster but it will also be weaker in it's pushing power. The same rule pertains to the volume of the device receiving the oil. The larger the device the slower and more powerful it is and the smaller the volume of the device receiving the oil the faster and weaker it will be.

Zane

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