Ford 3910 remote valve problem

[Jasperfield]

My 1988 Ford 3910 is equipped with a single spool remote control valve which is mounted below the tractor seat. Two hoses run from the valve to the rear of the tractor where I can attach two hydraulic hoses.

The valve is operated with a single lever handle which has a detent at its center position.

I'm trying to operate a Metavic log-loader trailer. Whenever any cylinder on the loader reaches the extent of its travel the control valve throws itself into the detent position, and all hydraulic activity stops until I move the valve lever out of detent. In other words, I'm not able to operate this implement without having to continually reset the valve lever.

This implement (log-loader trailer) also has a continuous rotation grapple on it. Also, it has a large valve body with control levers and lots of hoses mounted near the back of the trailer.

The tractor provides plenty of flow and pressure to operate the implement, but the valve is preventing normal operation.

I have the quick-drop valve, on the tractor's valve body, closed.

Do I need to replace the single spool valve with one that "diverts" the flow (if I can find one)?

I don't know much at all about hydraulics, as you can tell.

 

[Jerry/MT]

My 1988 Ford 3910 is equipped with a single spool remote control valve which is mounted below the tractor seat. Two hoses run from the valve to the rear of the tractor where I can attach two hydraulic hoses.

The valve is operated with a single lever handle which has a detent at its center position.

I'm trying to operate a Metavic log-loader trailer. Whenever any cylinder on the loader reaches the extent of its travel the control valve throws itself into the detent position, and all hydraulic activity stops until I move the valve lever out of detent. In other words, I'm not able to operate this implement without having to continually reset the valve lever.

This implement (log-loader trailer) also has a continuous rotation grapple on it. Also, it has a large valve body with control levers and lots of hoses mounted near the back of the trailer.

The tractor provides plenty of flow and pressure to operate the implement, but the valve is preventing normal operation.

I have the quick-drop valve, on the tractor's valve body, closed.

Do I need to replace the single spool valve with one that "diverts" the flow (if I can find one)?

I don't know much at all about hydraulics, as you can tell.

You can remove the detent. You just remove the detent spring.
You have to remove the valve from the top of the lift cover. You then remove the detent retainer snap ring,(careful, don't let the parts fly out since thery're under spring tension), the detent retainer, and the spring. Put the spring in safe place and reassemble.

 

[CalG]

I have no direct experience with your tractor, but it sounds like the "detent position" is the over pressure kick out. Unless I misread your description.

removing the detent spring will not permit the functionality you require.

A valve with "power beyond" is what is needed.

Sorry I can not assist with the reconfiguration. (See my first sentence ;-)

Well, you could make use of a rubber bungee to continually activate the control lever. That would put the tractor valve in bypass whenever it would have kicked out. That would not be good in the long run.

 

[pacerron]

My 1988 Ford 3910 is equipped with a single spool remote control valve which is mounted below the tractor seat. Two hoses run from the valve to the rear of the tractor where I can attach two hydraulic hoses.

The valve is operated with a single lever handle which has a detent at its center position.

I'm trying to operate a Metavic log-loader trailer. Whenever any cylinder on the loader reaches the extent of its travel the control valve throws itself into the detent position, and all hydraulic activity stops until I move the valve lever out of detent. In other words, I'm not able to operate this implement without having to continually reset the valve lever.

This implement (log-loader trailer) also has a continuous rotation grapple on it. Also, it has a large valve body with control levers and lots of hoses mounted near the back of the trailer.

The tractor provides plenty of flow and pressure to operate the implement, but the valve is preventing normal operation.

I have the quick-drop valve, on the tractor's valve body, closed.

Do I need to replace the single spool valve with one that "diverts" the flow (if I can find one)?

I don't know much at all about hydraulics, as you can tell.

I have a 3910 with a single handle valve like that and yours is acting properly.
I only have one set of remotes also. To operate my FEL I just keep the lever back using a small bungie cord to keep it open.
Same for hay rake. For roll bale maker which only requires up and down operation when dumping a full roll just leave the bungie off and hold the lever back to raise the door. Hold it forward to lower the door. I've done this for 20 years, 3000 hours, with no problems to the system. No guarentees for your system though. Be sure to release the bungie and equalize the pressure by moving the lever on the tractor back and forth ending in the center position before pulling the hoses from the remote valves.
Since you have control levers on your wagon I would think using a bungie
on the tractor lever would work for you.

 

[Jasperfield]

Yes,You are correct, it is the overpressure kick-out.

I thought about removing the detent spring but haven't done so.

I tried holding the lever in position with a bungee and the tractor did not like that at all. Then I spoke with two New Holland mechanics about using a bungee to hold the lever in position, and they said whatever you do...don't do that.

I have heard about a power-beyond but don't have any idea what it is or what it's supposed to do. Please explain the power-beyond.

Thank you.

 

[pacerron]

What do you mean by, " the tractor did not like that at all"?
Please explain...
I suspect you are describing a condition where your control lever valves on the log trailer are not responding correctly and/or you hear the tractor pump under stress. If so, it is usually caused by an inbalanced hydraulic pressure or oil void in the line, which I mentioned in my previous post to you.
This can be caused by a number of incorrect procedures.
Often it is caused by accidently plugging the hoses in wrong and then correcting them without balancing the pressure at the valve. A leak-by in the system after it has set idle for awhile with an implement attached and not in rest position also causes the problem.
A lot of folks park their tractors with the FEL bucket off the ground or a mower in the raised position, knowing this is not safe but figure overnight the
leak-by will put the implement on the ground anyway.
If you have ever found it difficult to release the implement hoses at the remotes you have experienced out of balance pressure. With the engine shut off, moving the lever under your seat to the forward position for a moment then to the rear position and back to the center should equalize the pressure.
You might have to do it on the implement control handles too.
Then hook up your remotes with the engine off before moving the lever under the seat to whichever position you have picked to be the proper flow direction for the way you normally plug in the remotes. It is helpfull to put a piece of tape or paint one of your hose ends from the implements to easily identify which one plugs into which remote.
On newer tractors with multiple remotes everything is color coded.
In any case, since you said you were not familiar with hydraulics.... play it safe. Hydraulic oil under pressure that springs a leak can do a lot of damage
to your body.

 

[pacerron]

I took a look at my 3910 manual and there are different configurations of the valve that may have been made besides the spring that effect operation. Even the flow control on the side of the tractor has an effect if the lift rear linkage handles are in full up vs. full down position.
If you have a manual I suggest you study pages 25 thru 33 and compare the pictures to your valve as to type and how the control screws may be turned.
Unless you have owned the tractor from brand new you don't know what adjustments may have been made. Even then dealers make adjustments to fit the equipment operation that may have been sold with the tractor or at a later date.

 

[Jasperfield]

Thank you for your help. The valve is working and in good order. I neutralize the pressure before and after using any hydraulic implement. The hoses are attached correctly and connect and disconnect easily.

The implement manufacturer's engineers determined that the problem can be solved by adjusting the tractor's hydraulic pressure relief valve to a higher pressure.

Currently the valve kicks-out at 1500 psi (by guage on implement) and has to be reset. The tractor will generate up to 2500 psi.

Where is, and how do I adjust the pressure relief valve?

Thank you,

Jasperfield

 

[Jasperfield]

My valve is the same as that shown on pg. 29, figure 26.

My flow control valve, shown on pg. 27, figure 23 is in the "fast position".

My pump, by gauge, will produce 2500 lbs.

I have not, however, tried raising the draft control to the top position and using different settings of position control, and vice versa.