Finding point of failure - diverter valve or FEL control valve

[Bob Rooks]

Are there load checks in this particular valve? Many loader valves have them.
This is what makes me think of blown cup seals - "3. The bucket curl function works somewhat, but relief valve releases pressure when reaching only 1500psi. Because the oil is by-passing the piston. The resistance required to create pressure is limited. I don't believe the lower pressure you're seeing is the relief popping. There should be a squealing or hissing sound coming from the valve if it's releasing. There will be a hissing sound coming from a cylinder if the seals are by-passing.
4. The bucket uncurl function works and relief valve releases pressure at 2100psi. Because the piston is at the end of it's travel, and the cup seal is up against the cylinder end."
Just my two cents because I've experienced this first hand.

 

[ljplum12]

Are there load checks in this particular valve? Many loader valves have them.[\QUOTE]
I don't know the answer to this. How would I find that out?

Is there a way to verify blown cup seals without tearing into the cylinder?

 

[ljplum12]

Are there any quick connectors between the valve and the loader? They might be loose or damaged.

No, there are no quick disconnects besides the main in/out connections.

 

[LD1]

Is there a way to verify blown cup seals without tearing into the cylinder?

Yes but its messy.

First, EXTEND the cylinders all the way (Dump the bucket). Remove the rod side hose. Try to dump again.....if oil comes out the cylinder where you just removed the hose....bad seals. If no oil comes out, seals good.

 

[Bob Rooks]

First, EXTEND the cylinders all the way (Dump the bucket). Remove the rod side hose. Try to dump again.....if oil comes out the cylinder where you just removed the hose....bad seals. If no oil comes out, seals good.

Actually, you want to extend in the direction that you were getting the low pressure reading, whichever that was.

 

[ljplum12]

Actually, you want to extend in the direction that you were getting the low pressure reading, whichever that was.

The low pressure is when I'm curling the bucket, so do I still remove the hose on the rod side? How do I check the lift cylinders?

 

[Bob Rooks]

How do I check the lift cylinders?

The same as the tilt cylinders. Lift the bucket until the relief valve squeals or hisses. Lower the bucket flat on the ground and lift the front of the tractor until the relief valve squeals or hisses. If the indicated pressure is the same in both directions, and the lift arms hold in both directions, the cup seals are fine. Something I forgot to ask, do you have the regen feature on your loader valve?

 

[Bob Rooks]

The low pressure is when I'm curling the bucket, so do I still remove the hose on the rod side?

I don't know how your cylinders are mounted so I can't say without seeing a picture.

 

[ljplum12]

The same as the tilt cylinders. Lift the bucket until the relief valve squeals or hisses. Lower the bucket flat on the ground and lift the front of the tractor until the relief valve squeals or hisses. If the indicated pressure is the same in both directions, and the lift arms hold in both directions, the cup seals are fine. Something I forgot to ask, do you have the regen feature on your loader valve?

I can't actually lift the bucket unless I back up the pressure by turning the steering wheel.

If the bucket is on the ground and I try to either lift the bucket or go down to lift the front of the tractor, the cylinders don't do anything and the pressure goes to 2100psi. There is no regen on the valve that I can tell.

 

[Bob Rooks]

Regen is a detent that you go through when you dump the bucket. The bucket dumps very quick. Back in a few.