I am a beginner!!! Please Help with basic hydraulic fundamentals

[garrettf]

I am a senior engineering student and have a project regarding hydraulic circuits. I am very green to the subject and my professor is basically nonexistent. I want to learn how to do this stuff so can anyone read my assignment (attached) and possibly point me in the right direction? These circuits are so confusing. The homework is on an excavator, not a tractor, but I figured the general concepts will be the same.

 

[farm boy00]

Can't help you but wish you the best of luck and hope this ain't due immediately. Be following to learn a thing or two

 

[Looking4new]

I too will be following and maybe learn something.

 

[TheMadOne]

Holy crap that's a lot of pressure and flow!

For reference, the loaders used here mostly run off of a 2500ish psi pressure with flow rates usually in the teens or even single digits!

 

[JD5210]

Maybe these 31 youtube videos will be helpful. I know I learned a LOT from.

Hydraulics Math - YouTube

 

[oldnslo]

I suspect your biggest problem is going to be accessing symbols libraries for the components. Companies like Danfoss, Rexroth, Eaton-Vickers, Parker all make products that would work in this application.

Mobile directional valves have a lot of options available today so a big majority of this project is finding the correct valve style and selecting all the required features.

If I remember correctly Danfoss PVG or Rexroth M4-15 valves would a possible starting point.

good luck

good luck

 

[jaydee325]

There is some info in this post.

http://www.tractorbynet.com/forums/hydraulics/349710-learn-about-hydraulics.html

 

[elbowroom]

More info
Fluid Power eBook — Fluid Power Circuits Explained | eBooks content from Hydraulics & Pneumatics

Iso symbols
Http://engineersedge.com/hydraulic/symbols/hydraulic_iso_schematic_symbols.htm

 

[elbowroom]

Load sensing pump article
Http://www.insidersecretstohydraulics.com/hydraulic-load-sensing.html

 

[elbowroom]

I'm struggling with a couple things. The weight of the cat is given, so I assume that will be the limiting factor in your fbd force calculations? Does an excavator usually have enough boom power to pull itself along? Also, are the pivot points defined, cylinder sizes, or is that something you have to do as well?

Good problem.

 

[MossRoad]

Here's a link to the Army field manual for hydraulics, FM 5-499. Its in PDF format.

Download it and save it. Read. Good stuff. :thumbsup:

http://www.derijcke.com/dl/manual.pdf

 

[BHD]

on john deere, a variable displacement pump is used on close system hydraulics, and are (I think are considered load sensing) in that it build up pressure and then adjust the flow to match the needs to max of the pump, I would think three valves, and the the approperate hose to the three circuits, (or what i am seeing, If I did not miss read some thing),

this may help
Parker info
https://www.google.com/url?sa=t&rct...9W_GysyC8OO59n0VA&sig2=XZKu6bkxoDFkgfud8IO65w


Pressure Compensated Hydraulic Pumps
Pressure Compensated Hydraulic Pumps | Womack Machine