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John Deere Tractors Discussion Forum
Show Parts for Model:

loader control valve

Author 
Doc8246

11-26-2005 17:09:48
63.66.232.25



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I priced a loader control valve for a model 48 loader from john deere the price was 600.00 dollars. Is there any good after market valves that can be bought any cheaper? Thanks doc




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John VB

11-27-2005 06:01:14
216.170.60.122



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 Re: loader control valve in reply to Doc8246, 11-26-2005 17:09:48  
Not Deere related (maybe a little). I have a Farmhand F11 loader on a JD620. The loader does not stay put but slowly creeps down. I think I need a new set of control valves. They also leak. What do you mean by open and closed center? What type of setup would I need? Thanks for your help.



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Randalp

11-27-2005 07:13:17
198.53.171.45



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 Re: loader control valve in reply to John VB, 11-27-2005 06:01:14  
"Open center" oil from pump passes through the valve assm. back to tank when valves are in neutral position.
"Closed center" oil from pump is dead-ended at the assm. when valves are in neutral.

Some Assemblies can be converted to do both.

The creeping loader can be caused by several things. Leaking cylinder( internal or external leaks)and yes, worn valves.

Be careful when buying a replacement valve assembly. There are many things to consider:
-closed/open center
-internal relief
-load check valves
-double/single acting
-GPM capacity
-metering grooves

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John VB

11-27-2005 09:35:42
216.170.60.18



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 Re: loader control valve in reply to Randalp , 11-27-2005 07:13:17  
Thanks for the reply. Now I have more things to consider. The loader is run off a pto pump. I assume I would want "open center". I also probably want double acting. What are load check valves, metering grooves and internal relief? I have seen adjustable pressure relief valves (1500-3000 psi). Is there a site somewhere that explains these basic issues?



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Randalp

11-27-2005 15:11:59
198.53.171.45



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 Re: loader control valve in reply to John VB, 11-27-2005 09:35:42  
don"t know about a website, but....

-load checks are required for lifting and holding, otherwise when attempting to re-lift a load, the loader will drop slightly before the hydraulics catches up.
-double acting means your loader will power downwards as well as upwards. If you can lift the frt. wheels off of the ground, its double acting. Another thing to tell by is if it has one or two hoses to each cylinder. One hose to each cylinder means its single acting.
-metering grooves allow you to slowly move the boom or bucket if you slightly move the lever.
-internal relief is simply that. A relief valve that should open before "loader damage" from over stress (pressure)occurs.

Hope this helps...

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Randalp

11-27-2005 15:11:55
198.53.171.45



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 Re: loader control valve in reply to John VB, 11-27-2005 09:35:42  
don"t know about a website, but....

-load checks are required for lifting and holding, otherwise when attempting to re-lift a load, the loader will drop slightly before the hydraulics catches up.
-double acting means your loader will power downwards as well as upwards. If you can lift the frt. wheels off of the ground, its double acting. Another thing to tell by is if it has one or two hoses to each cylinder. One hose to each cylinder means its single acting.
-metering grooves allow you to slowly move the boom or bucket if you slightly move the lever.
-internal relief is simply that. A relief valve that should open before "loader damage" from over stress (pressure)occurs.

Hope this helps...

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John VB

11-27-2005 17:13:05
216.170.60.93



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 Re: loader control valve in reply to Randalp , 11-27-2005 15:11:55  
Thanks for the information. It really does help. Based on your information, my current setup has double acting, metering grooves and load checks. Now I know what to look for in a replacement. Thanks again.



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Randalp

11-26-2005 21:25:47
198.53.171.45



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 Re: loader control valve in reply to Doc8246, 11-26-2005 17:09:48  
http://cgi.ebay.com/HYDRAULIC-CONTROL-VALVE-30-G-P-M-2500-P-S-I-2-SPOOL_W0QQitemZ7567109395QQcategoryZ41484QQrdZ1QQcmdZViewItem



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Nylon

11-26-2005 20:43:52
209.191.208.37



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 Re: loader control valve in reply to Doc8246, 11-26-2005 17:09:48  
I just hooked up a prince valve. It was right close to $200. I have a 148 loader on a 68 4020 deere.I think it came from surplus supply.

John



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Hayfarmer

11-26-2005 18:18:31
66.243.233.207



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 Re: loader control valve in reply to Doc8246, 11-26-2005 17:09:48  
Probably, the main thing is if it is going on a new generation or newer tractor it has to be closed center. Many valves can be adapted to closed center. Northern Tool has lots of hydraulic valves as does Surplus Hydraulics. Both have internet sites.



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