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Ford Tractors Discussion Board |
Re: Remote Hydrualics - low pressure
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Posted by Rod F. on February 24, 2005 at 08:54:42 from (142.177.84.73):
In Reply to: Re: Remote Hydrualics - low pressure posted by Alex H. on February 24, 2005 at 04:30:41:
I don't know of any source on the web for any hyd circuit diagrams. I have the Ford manuals, and they have good circuit diagrams. Now, since you know you have pilot flow coming from the remotes, you know the remotes are good. Basically, you need that pilot flow to move the combining/sequencing valve from the unload position and direct oil to the remote circuit. Generally, I remove the priority pack from the tractor, and take all the valves out and clean them in solvent, lube in fresh oil and reinstall with all new O-Rings on the respective surfaces (caps and priority pack face). You may be able to pull the combinging/sequencing valve without removing the priority pack, depending on how many lines are running around in front of the pack. It's really quite simple. Just carefully remove the lower left (standing behind facing forward) plug on the priority pack. I can't remember for sure if this is a plug with an allen head or a cap style with a hex head, but it is on the front of the priority pack, and is on the left side. There will be a spring inside, with a filter screen behind the spring, then the valve, with a relief valve built into the valve. As I mentioned previously, scribe the end of the valve body, and also the set screw in the relief valve in a corrosponding manner, and then you can remove the set screw and extract the relief valve spring, retainer and ball. I have sometimes found dirt or metal on this ball/seat, and that could be the source of the problem. Make certain that you count the number of turns out on the relief valve set screw, so that you can install it back to where it was and get the correct pressure setting. That should solve the problem. Chances are good that you will see absolutely nothing out of the ordinary in there. It's just the wonders of that system. I have seen that valve act up a couple times a week on my 7710, and then go for 5 years without a hitch. There is simply no rationale for it. HTH. Rod
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