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Rebuilding Hydraulic Spool Valve For Johnson Loader

hydraulic spool valve johnson loader massey

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#16 Alc ONLINE  

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Posted November 18, 2014 - 06:31 AM

Does anyone know what those 2 straight  slotted  ( plugs ?) are for , located between the work ports on the top of the valve ?  


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#17 NUTNDUN OFFLINE  

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Posted November 18, 2014 - 07:00 AM

Does anyone know what those 2 straight  slotted  ( plugs ?) are for , located between the work ports on the top of the valve ?  

 

I did pull them out and they were just like the pressure release minus the bolt. They had a plunger and spring under each one.


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#18 IamSherwood OFFLINE  

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Posted November 18, 2014 - 07:51 AM

I did pull them out and they were just like the pressure release minus the bolt. They had a plunger and spring under each one.

 

Being they are on either side of the left spool, I think they are probably detents. Does that valve have

a float position that it stays in, when pushed forward?

 

As said, a lot of those valves don't have O-rings on the spools. I'm guessing that bolt in the pressure

relief valve is the culprit.


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#19 NUTNDUN OFFLINE  

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Posted November 18, 2014 - 07:58 AM

The valves are plain with no float or detent positions. It looks like there could be a couple of o-rings on the inside of the valve body but I can't tell for sure.

 

I could always try adding a couple of washers to the bolt on the pressure relief and see if it helps. The way the valve would act though seemed to be more in the valving and letting pressure past. The bucket tilt would lift the ass of the tractor off the ground but the main arm lift wouldn't budge anything over 50 lbs. Even empty if you moved the lever all the way sometimes it would lift and other times just sit there. Sometimes if the arms were already up in the air and you pulled the lever back to go higher it would actually go down.



#20 IamSherwood OFFLINE  

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Posted November 18, 2014 - 08:05 AM

Get yourself a pressure gauge, and tee it into the down stroke side of your lift

cylinders. Could be the seals in the cylinders.


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#21 Alc ONLINE  

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Posted November 18, 2014 - 08:31 AM

I wonder if those plugs are for " Load Checks "    My PK doesn't have them and  one time I was lifting a  wood chipper off a pickup the loader arms lifted it but when I tried tilting the bucket back instead of tilting back there wasn't enough psi to tilt back the bucket just fell forward  ( since then I had to reset the relief valve )    Will  my angle cylinder acted like you described when the piston was broken inside , you would want to move one direction and it seem to want to go in the other , a seal would act like that too ?


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#22 NUTNDUN OFFLINE  

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Posted December 26, 2014 - 06:11 PM

Get yourself a pressure gauge, and tee it into the down stroke side of your lift

cylinders. Could be the seals in the cylinders.

 

I really do need to get a pressure gauge. Would answer a lot of questions. I might try and get one here the next couple of days. 



#23 NUTNDUN OFFLINE  

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Posted December 26, 2014 - 06:16 PM

I just now got around to taking pictures of the valve torn halfway apart. 

 

Here is the top view of the valve where the two smaller button plungers and springs resided:

IMG_20141226_175945.jpg

 

Here is the pic of those two plungers and their springs and screw cap:

IMG_20141226_180022.jpg

 

This pic is where the pressure valve sits:

IMG_20141226_175954.jpg

 

And the next two pics are to show the pressure valve and its contents the way they came out of the valve body.

IMG_20141226_180008.jpg

 

IMG_20141226_180058.jpg


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