FEL lift and tilt/dump issue

[Terry Gable]

Latest issue with the Farm Pro 2425, it sat unused for a couple months and when I used it this last weekend, I noticed the Hydraulic fluid was low so I filled it. I know there is a leak in one of the FEL cylinders so expected low oil. Initially the arms lifted and the bucket would operate correctly but a few minutes later the arms would only raise if the steering wheel was turned full right and rocked back and forth and the bucket required assistance to level. The steering, back lift arms, and PTO work fine and I was able to run the brush hog. I was thinking there may be air in the system but am not sure how to remedy that, any ideas? The FEL data plate says its a 2004 and model number appears to be 03962.

Thanks,
Terry

[RonMar]

That sounds like the safety relief in the loader control valve may be stuck open. These are usually plummed with the pump output going directly to the loader valve, then from there to a priority valve which diverts the flow from the 3PH to the steering when you turn the wheel. IF the loader control valve safety cartridge is stuck open, the path of least resistance when a loader control valve is operated, instead of moving the loader, is out thru the safety and on down stream to steering and 3PH. Working the steering increases the back pressure a little at the loader, so some of the fluid passes out the working ports and moves the loader arms and bucket(probably not at full strength).

You may be able to pull the relief valve without changing the set point to inspect for debris in the valve. I know some of the chinese control valves, the relief cartridge is held in place with a 4 bolt flange and comes right out when the 4 scews are removed. IF the adjustment gets changed, you will need to be able to connect a gauge to one of the working ports to properly(safely) set the relief pressure.

As for purging air, that is easy. Simply cycle all the hydraulic cylinders to their end stops in both directions several times. This will expell any air in the system back into the reservoir, providing the source for the air has been removed...

[Terry Gable]

Thanks Ron, do you have any pictures or information specifically for the loader control valve? I bought this tractor used and it had no manuals. Is there any outward indication of the safety relief position?

Thanks again,
Terry

[J_J]

The Farm Pro 2425 only have about 3 GPM hyd flow.

Don't see how the power steering can boost the hyd to the loader. It is usually in parallel or if in series, it is first in line.

The power steering normally has priority over any other hyd function.

Have you checked the hyd pressure with a gage?

If you had a FEL relief valve stuck open, the 3pt would not work normal.

Just cycle all the cyl to purge all the air.

[Terry Gable]

Thanks, will mess with it this weekend.

Terry

[Affordable]

The CBN-E314L Hydraulic pumps on the Y385T engine have a Hydraulic flow of 7.40GPM ??? Terry we have the Manual sets, make sure you check which engine you have. Your FarmPro 2425 is the same as the 200 series Jinma tractor,they used a couple different engines. Yangdong
Y385T , Liadong KM385, Quanchai QC385

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

[RonMar]

Don't see how the power steering can boost the hyd to the loader. It is usually in parallel or if in series, it is first in line. The power steering normally has priority over any other hyd function.

Not on the Jinma 200 series, loader is first in line after the pump. I have seen this problem before, and a little bit of backpressure on the valve forces fluid out to the working ports, same as if the safety was closed. Maybe this drawing will help...

If you had a FEL relief valve stuck open, the 3pt would not work normal.

UH, yes it would. JJ if you had one in front of you you would see why. In the drawing, there are only 2 lines to the loader, so the flow either passes thru the open center, the working ports/cylinders or thru the safety. Wether it is relieving or not, or wether the loader is working or not has no real effect on steering or 3PH as the flow out of the loader is always the same to feed steering and 3PH. The steering has priority over the 3PH. IMO, the loader really was an afterthought on this tractor.

[J_J]

If your schematic is correct, then the hyd circuit is poorly designed .

[RonMar]

It isn't too bad untill you put the FEL on

[EE_Bota]

To the Op, if your valve is like mine, if you look down on the valve body from above, you will see a large plug. The relief valve is opposite that plug therefore out the bottom. On mine, the relief is pretty obvious because it is the only adjustable thing. I took out the top plug, spring, and ball and I could look into it an see the relief spool top. That ball and spring are not associated with the relief, they are instead the check valve. But after loosening the two bolts underneath that does hold the relief in, I could push it out from above through the check ball opening.

If this does not sound like your valve, it likely isn't. Mine is a 304 circa 2004.

Probably not related to your problem:
On mine, the problem was that the spring that was supposed to hold the chromed relief spool in position was not strong enough to make it close again due to roughness. I don't know why or how. The tractor was "new to me" and the loader did not work when I bought the tractor. So you just continue onward and upward without trying to guess too much about what the previous owner did.

When I pushed the spool into place with my finger, I'd get resistance and then a click as it moved into position. I repeated that over and over, and realized that can't be right. So I took the block section that contained the relief completely off, and used my drill and some drill rod heavily taped up with vinyl tape to spin the spool in its bore. I used some Mother's aluminum mag polish as my abrasive, and I lapped the relief spool in the bore only until it would move freely in and out without stiction. Then I cleaned it all up exceedingly well to remove all abrasive and put it all back together with new O-rings.