Not enough hydraulics?

[mopedal]

I recently bought a 3 point hitch, Land Pride, RCP2560 "boom mower" to use with my M7040. Hooked it up and it worked perfectly but...I have to keep hand pressure on the control lever to keep pressure going to the remote. Is this normal? Keep in mind, the PTO runs the bush hog so that isn't tasking the tractor hydraulic system. It almost appears the hydraulic system isn't putting out enough volume or pressure to run the different cylinders of the boom mower. No other hydraulics are being used at the same time. Any help would be appreciated.

 

[mopedal]

I've been told it is too small a tractor. Thoughts?

 

[mickeyd]

That is because of the weight requirement. Since your tractor is about 4,000 lbs to light, you would have to add that much weight to stabilize the tractor.

 

[RCW]

Go to tractordata.com to check your hydraulic pump capacity.

Understand part of the pump is dedicated to steering.
Guessing nothing to do with weight, but the gpm needed to run the boom mower.
When running boom mower plus a PTO bush hog, might be more than it can handle.
One concern would be hydraulics getting overheated, but they are meant to run pretty hot.


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[North Idaho Wolfman]

Did you set it up for open center operation, and not closed center.

 

[MtnViewRanch]

I recently bought a 3 point hitch, Land Pride, RCP2560 "boom mower" to use with my M7040. Hooked it up and it worked perfectly but...I have to keep hand pressure on the control lever to keep pressure going to the remote. Is this normal? Keep in mind, the PTO runs the bush hog so that isn't tasking the tractor hydraulic system. It almost appears the hydraulic system isn't putting out enough volume or pressure to run the different cylinders of the boom mower. No other hydraulics are being used at the same time. Any help would be appreciated.

I'm lost, if you want the cylinder to either extend or to retract, yes you need to keep the lever pushed or pulled in that direction unless you have self canceling detent control, valves.

 

[mickeyd]

I've been told it is too small a tractor. Thoughts?

The reason for the tractor being too small:

"Tractor Requirements
The Parallel Arm Cutter, by design, must be used only
on tractors that are capable of controlling the cutter
under all operating conditions. When the arms are fully
extended, a right-hand torque load on the tractor is
present which will try to tip the tractor over! The tractor
MUST have a minimum weight of 7000 lbs. A 3-Point
Category II or Category III hitch with hydraulic lift
control is required.

Since the given weight for the M7040 is: 4675 to 5470 pounds that would leave the tractor 2,000 to 3,00 lbs to light.

I wasn't addressing the hydraulics question, only the second part about the tractor being to small.

 

[MtnViewRanch]

I've been told it is too small a tractor. Thoughts?

With the loader, your tractor can be ballasted to around 10,000lbs. Without the loader, about 8,000lbs. The tractor is fine if ballasted correctly.

 

[mopedal]

I appreciate all your inputs...I should have included it has a front end loader and a cab. The ballast in the tires is good too, I figure around 8k. I'm not real worried since even more weight can be added to the implement hydraulic tank (800-1000 lbs).
My main concern is when I engage the remote and work one of the hydraulic cylinders it will bring the control lever back to the middle position. So I must manually keep the lever engaged by holding my hand on it to keep it from cutting off the flow to the remote. The hydraulic pump produces 11 gpm. The requirement is 14 gpm or less (according to Land Pride specs). Is it possible that the 3 gpm difference is causing this?

 

[mopedal]

Did you set it up for open center operation, and not closed center.

Great question...I'll look into that!

 

[mopedal]

I'm lost, if you want the cylinder to either extend or to retract, yes you need to keep the lever pushed or pulled in that direction unless you have self canceling detent control, valves.

When I push the control lever forward, it will stay there but, if i use one of the cylinders, it causes the lever to come back to the center.

 

[mopedal]

Did you set it up for open center operation, and not closed center.

It is a open center.

 

[North Idaho Wolfman]

If your using a Function valve off of the tractor to run another valve on the implement you will have to "lock" the control in the active position for it to keep working when you need it to.
The implements pressure change on remote activating and deactivating will trip the detent on the tractor valve and cancel it.

This can be done with something a simple as a bungee cord on the valve lever.

 

[mopedal]

If your using a Function valve off of the tractor to run another valve on the implement you will have to "lock" the control in the active position for it to keep working when you need it to.
The implements pressure change on remote activating and deactivating will trip the detent on the tractor valve and cancel it.

This can be done with something a simple as a bungee cord on the valve lever.

That's what I've done is keep it ingaged with a bungee cord...seems to work!
Been doing a little studying and found this Land Pride works on low pressure as well as high pressure (14 gpm and less & 15 gpm or more). The boom mower is correctly set up for the lower pressure but specs say the M7040 has a 11 gpm flow. I am wondering if the 11 gpm is enough to satisfy the thirst of the boom mower hydraulic system (minus the bush hog demand since it's powered by the PTO)?

 

[Bulldog]

When I push the control lever forward, it will stay there but, if i use one of the cylinders, it causes the lever to come back to the center.

To me it sounds like when you use the other control it takes the pressure away from the first one which allows it to return to the center position.

 

[North Idaho Wolfman]

That's what I've done is keep it ingaged with a bungee cord...seems to work!
Been doing a little studying and found this Land Pride works on low pressure as well as high pressure (14 gpm and less & 15 gpm or more). The boom mower is correctly set up for the lower pressure but specs say the M7040 has a 11 gpm flow. I am wondering if the 11 gpm is enough to satisfy the thirst of the boom mower hydraulic system (minus the bush hog demand since it's powered by the PTO)?

GPM is not pressure it's flow, pressure would be PSI measurements.
Does it say what psi it needs?

 

[mopedal]

GPM is not pressure it's flow, pressure would be PSI measurements.
Does it say what psi it needs?

It doesn't show a a PSI requirement that I can find. Only a GPM being "approx" 14. The M7040 puts out 11 GPM.

 

[North Idaho Wolfman]

It doesn't show a a PSI requirement that I can find. Only a GPM being "approx" 14. The M7040 puts out 11 GPM.

A lower GPM will only make cylinders move at a slower rate, it really will not affect strength or performance.
If you were running a motor off of the hydraulics then GPM would play a huge role in performance issues, as too low of gpm would make the motor weak and or have low RPM.

Is your only issue the the valve on the tractor canceling during operations?