Replaced all loader hoses and can only get minimal function

[TheOldHokie]

I could not get the videos on this site so here is a share link that should work.
One video I trace the hoses, sorry for the bumpy picture.
The other video is of the loader operating at full power and control in the full open position (very little power and slow).

ShareFile

nemcofoodequipmentltd.sharefile.com

At this point there is only one hose of interest. That is the one connected to the base end of the lift cylinders. Make no assumptions - put your hand on the line connected to the base end of the right side lift cylinder. Physically follow that line all of the way back to the loader valve and show us what port it is connected to.

Dan

 

[Nickk]

I will do that tonight.

You are terrific and thanks for your patience.

 

[Nickk]

I followed the instructions and here is what happened.
-Tractor not running - removed "C" line : Small amount of fluid
-Pushed control lever forward- fluid shot into bucket like a 1/2" garden hose would and loader dropped
Added step:
-Started tractor with hose off- fluid shot in like a 1/2" garden hose - a couple gallon 10-15 seconds.

This is how the boom hoses are connected.

 

[TheOldHokie]

I followed the instructions and here is what happened.
-Tractor not running - removed "C" line : Small amount of fluid
-Pushed control lever forward- fluid shot into bucket like a 1/2" garden hose would and loader dropped
Added step:
-Started tractor with hose off- fluid shot in like a 1/2" garden hose - a couple gallon 10-15 seconds.

This is how the boom hoses are connected.
View attachment 113700

Very good. So with C disconnected loader boom circuit works properly. Does it work when you reconnect C? If not what does that tell you?

Dan

 

[TheOldHokie]

I followed the instructions and here is what happened.
-Tractor not running - removed "C" line : Small amount of fluid
-Pushed control lever forward- fluid shot into bucket like a 1/2" garden hose would and loader dropped
Added step:
-Started tractor with hose off- fluid shot in like a 1/2" garden hose - a couple gallon 10-15 seconds.

This is how the boom hoses are connected.
View attachment 113700

I am looking at your sketch of the hose connections to the valve. I cant tell what that drawing indicates. It looks to me lukectgey are connectedcside to side. Ifvthats the case its not correct. The hoses should be connected front to back not side to side. Add the location of the joystick to that diagram.

Dan

 

[Nickk]

Very good. So with C disconnected loader boom circuit works properly. Does it work when you reconnect C? If not what does that tell you?

Dan

I guess the problem is in the outlet block; not allowing the non pressure side to flow back to the reservoir. There seems to be some sort of check valve on it; is that the issue?

 

[PoTreeBoy]

I guess the problem is in the outlet block; not allowing the non pressure side to flow back to the reservoir. There seems to be some sort of check valve on it; is that the issue? View attachment 113708

That's your pump discharge relief valve.

 

[TheOldHokie]

I guess the problem is in the outlet block; not allowing the non pressure side to flow back to the reservoir. There seems to be some sort of check valve on it; is that the issue? View attachment 113708

That is a pressure relief valve on the pump side and is what is protecting you from deadheading the pump. It is not the problem.

But yes - it appears something is blocking that C port circuit. That port is not the tank return - it is power beyond going to your 3pt. Make sure the 3pt position control lever is in the down position and any remotes are in neutral. There is no backhoe on this tractor is there?

I have also redrawn your hose diagram to clarify the port layout on the loader valve. Does it match your plumbing?

Dan

 

[Nickk]

I have done more trouble shooting.
-I removed line 2- this is connected to the rod side of the boom (the pressure port for lowering the boom).
-Curly and Dump work
-When lever is moved to lower the boom fluid shoot out this port.
-I then also removed the hose connected to port 1.
- When pushed to lower fluid shot out of port 2
-When the handle was pulled to raise fluid shot out of port 1 and 2.

Any ideas?
It seems like I have the right ports given handle position and where fluid shoot out; but, why does fluid shoot out both ports when pulled for raise?
If it is the regen feature I would think that would only be when lowering it?

Any help is appreciated!

 

[TheOldHokie]

I have done more trouble shooting.
-I removed line 2- this is connected to the rod side of the boom (the pressure port for lowering the boom).
-Curly and Dump work
-When lever is moved to lower the boom fluid shoot out this port.
-I then also removed the hose connected to port 1.
- When pushed to lower fluid shot out of port 2
-When the handle was pulled to raise fluid shot out of port 1 and 2.

Any ideas?
It seems like I have the right ports given handle position and where fluid shoot out; but, why does fluid shoot out both ports when pulled for raise?
If it is the regen feature I would think that would only be when lowering it?

Any help is appreciated!


View attachment 114110

Based on that diagram and your description you still have hoses crossed.

The boom cylinder ports are 2 and 4.

The bucket cylinders ports are 1 and 3.

Fix that and we can talk some more.

Whoops - I missread your valve diagram.

Boom cylinder ports are 3 and 4.
Bucket cylinder ports are 1 and 2.


Dan

 

[PoTreeBoy]

This is a page out of the L35 WSM. I'm pretty sure the valve is the same.

I'll just point out that the boom section has series action. When the boom is raised or lowered, the exhaust fluid is directed to the PB passage, not the tank passage. This allows some simultaneous actions with the bucket - for example, you can raise the boom and dump the bucket at the same time.

I tried some of what OP describes by pulling hoses. All I did is create a big mess. A pressure gauge is the proper way to check those connections.

 

[TheOldHokie]

This is a page out of the L35 WSM. I'm pretty sure the valve is the same.

I am not at all sure. Here is the loader valve used on a LA524 which would be h efactory loader for a L - clearly monoblock and standard right hand design. Your LA35 valve is sectional and non-standard left hand design.

Pressure testing won;t tell us anything if we don't know the hoses are connected to the coreect ports. He needs to post a good picture of teh valve and hose connections - not a hand drawn diagram.

Dan

 

[Nickk]

Why would the valve flow fluid from both of the ports when not connected to a cylinder and the valve handle in the raise position...

 

[Nickk]

This is a page out of the L35 WSM. I'm pretty sure the valve is the same.
View attachment 114116
I'll just point out that the boom section has series action. When the boom is raised or lowered, the exhaust fluid is directed to the PB passage, not the tank passage. This allows some simultaneous actions with the bucket - for example, you can raise the boom and dump the bucket at the same time.

I tried some of what OP describes by pulling hoses. All I did is create a big mess. A pressure gauge is the proper way to check those connections.

Thanks

 

[Nickk]

This is a page out of the L35 WSM. I'm pretty sure the valve is the same.
View attachment 114116
I'll just point out that the boom section has series action. When the boom is raised or lowered, the exhaust fluid is directed to the PB passage, not the tank passage. This allows some simultaneous actions with the bucket - for example, you can raise the boom and dump the bucket at the same time.

I tried some of what OP describes by pulling hoses. All I did is create a big mess. A pressure gauge is the proper way to check those connections.

Your help is greatly appreciated; sorry for hte mess.

 

[TheOldHokie]

Why would the valve flow fluid from both of the ports when not connected to a cylinder and the valve handle in the raise position...

I wish I could answer your questions but I am having trouble understanding exactly what is hooked or unhooked and where.

Dan

 

[PoTreeBoy]

I am not at all sure. Here is the loader valve used on a LA524 which would be h efactory loader for a L - clearly monoblock and standard right hand design. Your LA35 valve is sectional and non-standard left hand design.

Pressure testing won;t tell us anything if we don't know the hoses are connected to the coreect ports. He needs to post a good picture of teh valve and hose connections - not a hand drawn diagram.

Dan

View attachment 114119

I can't be sure of the internals, but the valve on my nephew's L3600 looks just like my L35, including the gimbal mechanism. tractordata.com shows an LA 680 or LA681 on the L3600.

 

[TheOldHokie]

I can't be sure of the internals, but the valve on my nephew's L3600 looks just like my L35, including the gimbal mechanism. tractordata.com shows an LA 680 or LA681 on the L3600.

See how little we actually know about his situation. OP needs to break out the camera. My eyes are so bad I thought tractor data showed la540. The La680 valve is sectional but left handed - e.g inlet and tsnk on left and PB on right

Dan

 

[Nickk]

Looking at the schematic I can see how A1 gets pressurized (blue lines)- is that my lift (head) side of the boom cylinder? checked pressure is put on A1.
The red shows A1, B1, and PB all getting checked pressure.
The green shows Pressure directly to PB (outlet) and A1 and B1 being connected to the transmission line.
But I do not see how B1 gets pressurized - schematics with red markups. Is the boom down movement not pressurized? It would have to be to pick up the front end of the tractor?

 

[Henro]

Being of a simple mind, what I would probably do, is remove all the hoses and fitting from the control valve, then shift it for each movement and see which outlet spit out oil for each function.

Seems like that would identify where each of the four hoses controlling lift and tilt should be. The remaining hose would go to to the remaining port.

How crazy am I? No offense will be taken for honest assessments!

Actually no offense will be take in any case...

Edit: I said I was simplistic. Guess it would still be unknown which hose brought the hydraulic oil into the valve to begin with...oh well, I tried...or where to connect the hose that spewed oil when the tractor was started...