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I previously rebuilt two assemblies related to a hydraulic system, which were two Sundstrand Series 15 hydraulic motors. Today I will present to you, the teardown and rebuild process on a 3 Spool Valve Block. I will have a section where I explain the ins & outs of the valve block itself and how it functions!
This specifically, is a Cessna 3-Spool Hydraulic directional valve block. You will find this on various types of machinery and the machine I took this out of, a John Deere 400 garden tractor. A similar valve block can be found in the John Deere 300 Series garden tractors, but that only has two spools.
In this video, I disassemble the whole valve block until I can clean it thoroughly. Once everything was cleaned up I inspected all the internal parts and gave the 3 valve spools extra attention. It is very important that the valve spools have no damage whatsoever. If you do find damage on your spools, due to dirt, grime, or possibly too much pressure within the system, you should replace or repair your spool.
Once everything had been inspected, there was a green light to purchase new O-rings for the complete valve block! With the sizes & links below you should be able to find the proper o-rings for this assembly.
After I purchased new O-rings, I was able to rebuild this valve block in a very short time. This literally takes 10minutes to assemble!!
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Spreadsheet for O-Rings in this video: bit.ly/3o3Bn6F
Product Links:
Lubriplate Assembly Grease: amzn.to/390j66i
Loctite: amzn.to/3P5vp1O
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Timestamps:
00:00 Intro
00:30 Disassembly Process - Timelapse
04:16 Overview - 3 Spool Valve Block
07:10 Explanation - How Does A 3 Spool Valve Block Work?
12:07 Fittings & New O-Rings
14:06 Rebuild Process - John Deere 400 Valve Block
20:00 Final Result - Outro
Негізгі бет Автокөліктер мен көлік құралдары 3 Spool Hydraulic Valve Teardown, Explanation & Rebuild | John Deere 400
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