Non-functioning hydraulics

[TheOldHokie]

Dan, as I'm following you all's advice, I'm getting you want me to get pressure readings from the FEL valve PB and remote valve PB. I'll get those pressures later this morning.

Thanks for the explanation about how the reverse flow can be happening. Yes, it's only with the "control screw/diverter/spool" in the horizontal position. I found that out yesterday when I collected 4 gallons from the FEL valve inlet port. I understand that for loader or remote operation the "control screw" needs to be in the vertical position. I only switched to horizontal to isolate the 3PH, and diagnose why it wasn't working. I have verified the hose configuration multiple times because I understand I could have made a simple mistake. I wouldn't ask for help on a forum, if I hadn't already done my diligence.

I've been using a cloth to filter those 4 gallons back into a container to bring the tank level back into the sight glass for testing today.

Yes, the big question is: Why is there flow with pressure, but the loader and 3PH don't move?

My issues started with water contaminated fluid, a bad FEL valve float detent, and oil leakage from the quick disconnects. ...but it was working. I already had parts and seals for the HUSCO valve, so I removed it, cleaned it, and disassembled it. When I got to the bare valve block, I sprayed degreaser into the bores, rotated it, dunked it into hot soapy water, then I sprayed brake cleaner into the bores. The brake cleaner came off the block clean, so I called it good. Honestly, I didn't inspect the bores after the brake cleaner. The spools didn't show any scratches, chips, and wear marks. I reassembled with light swipes of vaseline, and everything went back together normally.

I'm going to finish filtering the oil for reuse, and get those PB pressures. Thanks!

No pressure test. Next test would be:

1. Reconnect inlet hose to loader valve
2. Make sure selector is vertical and leave it there
3. Disconnect loader power beyomd hosr from rear rempte and place the end in the hydraulic filler
4. Start tractpor and observe flow from power beyond.hose. Should be constant.
5. Try to raise loader

Dan

 

[Dashman]

Ok, I finally got enough fluid filtered through a cloth to fill the level to the sight glass.

I routed a hose from the loader valve PB to a container, and started the tractor. There was a little bit of flow. Then when I moved the loader valve control stick down to raise the loader, the flow would nearly stop, but the loader would not raise. ...and of course the "control screw" is vertical.

When I install the pressure gauge on the loader valve PB hose, I get about 25 psi. It raises with RPM, but not much.

 

[TheOldHokie]

Ok, I finally got enough fluid filtered through a cloth to fill the level to the sight glass.

I routed a hose from the loader valve PB to a container, and started the tractor. There was a little bit of flow. Then when I moved the loader valve control stick down to raise the loader, the flow would nearly stop, but the loader would not raise. ...and of course the "control screw" is vertical.

When I install the pressure gauge on the loader valve PB hose, I get about 25 psi. It raises with RPM, but not much.

Something very wrong here. The flow out the PB should be identical to the flow coming into the inlet. You said the inlet flow would quickly fill a bucket.

Dan

 

[Dashman]

I said, "I held the outlet hose into a bucket, and started the tractor. It made a pretty strong stream". ...and it also maxed out the pressure gauge briefly.

The flow out the FEL valve PB hose was less than that, and it stops when I move the control stick down. ...except the loader does not raise. ...does not move in any direction.

I can't imagine anything being wrong with the loader spools. I can't imagine anything wrong with the new quick disconnects I installed. Not that they have anything to do with power beyond pressure.

Yes, "something very wrong here". What's next?

 

[TheOldHokie]

I said, "I held the outlet hose into a bucket, and started the tractor. It made a pretty strong stream". ...and it also maxed out the pressure gauge briefly.

The flow out the FEL valve PB hose was less than that, and it stops when I move the control stick down. ...except the loader does not raise. ...does not move in any direction.

I can't imagine anything being wrong with the loader spools. I can't imagine anything wrong with the new quick disconnects I installed. Not that they have anything to do with power beyond pressure.

Yes, "something very wrong here". What's next?

I said, "I held the outlet hose into a bucket, and started the tractor. It made a pretty strong stream". ...and it also maxed out the pressure gauge briefly.

I dont understand that. Where is the gauge in this test?

If you have a strong stream coming into the valve you must have the same stream coming out. That is the definition of an "open center" valve.

Dan

 

[North Idaho Wolfman]

For clarification, let's back up one step.

Take the Power line off the loader valve and put that into a bucket (holding it in), what do you get when you start it.
If it's a lot and strong flow, then I have a feeling the loader valve "rebuild" is the issue here, or you have the tank and PNB lines swapped.

 

[TheOldHokie]

For clarification, let's back up one step.

Take the Power line off the loader valve and put that into a bucket (holding it in), what do you get when you start it.
If it's a lot and strong flow, then I have a feeling the loader valve "rebuild" is the issue here, or you have the tank and PNB lines swapped.

I have a feeling the P and T hoses are reversed.

Dan

 

[Dashman]

Eiiigh!!! I already determined that the outlet hose from the hydraulic block from the pump had a "good stream". I also installed the gauge at the end of this hose. It's in one of my photos, where I removed the hose from the inlet to the FEL valve. That test maxed out the pressure gauge, and did the "deadhead" thing with the starter (no engine run). I did it a subsequent time, when an engine run for 3 seconds, same thing, it maxed out the pressure gauge. Sound familiar?

You guys understand that I've already been at this for a few days. I haven't been able to work on it consecutively. I need to move forward.

I agree, the fishiness is in the FEL valve. The PB port should have the same pressure. I'll remove it, disassemble it, and inspect it.

Except, why wouldn't the 3 point valve work when the "control screw/diverter" was in the horizontal position?

 

[TheOldHokie]

Eiiigh!!! I already determined that the outlet hose from the hydraulic block from the pump had a "good stream". I also installed the gauge at the end of this hose. It's in one of my photos, where I removed the hose from the inlet to the FEL valve. That test maxed out the pressure gauge, and did the "deadhead" thing with the starter (no engine run). I did it a subsequent time, when an engine run for 3 seconds, same thing, it maxed out the pressure gauge. Sound familiar?

You guys understand that I've already been at this for a few days. I haven't been able to work on it consecutively. I need to move forward.

I agree, the fishiness is in the FEL valve. The PB port should have the same pressure. I'll remove it, disassemble it, and inspect it.

Except, why wouldn't the 3 point valve work when the "control screw/diverter" was in the horizontal position?

I jumped in here because you have not found the problem aftrr all your experimentation. I am trying to approach this methodically. If both spools are centered I cant envision anyway the rebuild is blocking the neutral (PB) circuit in the valve. Reversing P and T connections will. I will bow out now.

Dan

 

[North Idaho Wolfman]

I jumped in here because you have not found the problem aftrr all your experimentation. I am trying to approach this methodically. If both spools are centered I cant envision anyway the rebuild is blocking the neutral (PB) circuit in the valve. Reversing P and T connections will. I will bow out now.

Dan

What about check valves and PB sleeve?

 

[TheOldHokie]

What about check valves and PB sleeve?

A missing PB sleeve will not block center flow or loader operation.

If P and T are reversed the neutral circuit is blocked and the load checks will block loader operation.

Dan

 

[North Idaho Wolfman]

Eiiigh!!! I already determined that the outlet hose from the hydraulic block from the pump had a "good stream". I also installed the gauge at the end of this hose. It's in one of my photos, where I removed the hose from the inlet to the FEL valve. That test maxed out the pressure gauge, and did the "deadhead" thing with the starter (no engine run). I did it a subsequent time, when an engine run for 3 seconds, same thing, it maxed out the pressure gauge. Sound familiar?

You guys understand that I've already been at this for a few days. I haven't been able to work on it consecutively. I need to move forward.

I agree, the fishiness is in the FEL valve. The PB port should have the same pressure. I'll remove it, disassemble it, and inspect it.

Except, why wouldn't the 3 point valve work when the "control screw/diverter" was in the horizontal position?

Have you checked the pressure relief valve completely?

I'm wondering if the key to this issue is somehow related to you using 2 FEL Valves????

 

[TheOldHokie]

Have you checked the pressure relief valve completely?

I'm wondering if the key to this issue is somehow related to you using 2 FEL Valves????

By design the only thing connected in the last test was the loader valve.

Dan