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Backhoe control Valve replacement question


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#1 LostDog88 OFFLINE  

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Posted October 26, 2017 - 09:46 AM

I have the Simplicity/Allis 9020/720 and the boom on the backhoe is drifting when I release the stick. It has 6 sticks to control everything.
I want to swap out this old control valve.
Anyone know what I should be "googling" to find a replacement?

 



#2 secondtry ONLINE  

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Posted October 26, 2017 - 09:50 AM

Try 6 spool hydraulic control. Don



#3 sharkman OFFLINE  

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Posted October 26, 2017 - 02:09 PM

might want to look into a joystick to cut the number of levers down.  



#4 GardnMastr ONLINE  

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Posted October 26, 2017 - 05:05 PM

Support the boom, disconnect and cap the lines. Remove the support and see if it drifts then. If it does, its the cylinder packing. If it doesn't, its the valve. Divide and conquer. Isolate and test. Don't want to spend money and have the same problem as before.

#5 Talntedmrgreen OFFLINE  

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Posted October 26, 2017 - 06:25 PM

The valves can be rebuilt. I would replace with joysticks if you decide to go that route after testing.
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#6 Cvans OFFLINE  

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Posted October 26, 2017 - 08:28 PM

The valves can be rebuilt. I would replace with joysticks if you decide to go that route after testing. 

 

Some you can and some not. The ones on both my New Holland and my smaller loader controls were not rebuildable. There were no O-rings on the spools. They relied on a close tolerance fit and when they became scratched or worn there was no repair available. 






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