Front hydro pump to rear pto pump advise

[Dave_eng]

If anyone is looking for more information on the pump, the pump is an original gear pump that came with the loader. It is a Webster 077YC001701 LF. I am replacing it with a comparable pump as to save some dollars from the Webster.

I apologize for the lengthy delay in replying. I got a new computer and now each time I try and get unto the forum it does not recognize me. I have to go thru the password reset procedure.

Did the problem start with the installation of the replacement pump?
The sketch you provided is excellent and shows how simple the system is.
Are there quick couplings anywhere in the system as their internal failure will show no leak but erratic operation.
Please provide a link to the new pump.
Dave

 

[Mjordan]

Good morning Dave. Glad to hear you are handling the new technology well, I too sometimes get overly frustrated with how all of this works.

Thank you for replying. the problem started before the replacement pump. I am only replacing the pump because the housing cracked upon my removal recently. The pump was not leaking before and did a great job. Like we have stated previously, my problem seems to be only when I use the controls to bring the loader down. I am not a hydraulic whiz, but I would think that would be the least laborious on the engine. Maybe a valve in the control body is not letting the oil bypass? Not sure how this works, but the pump should not have to work while lowering the loader would it? I have attached pictures of the valve. Maybe replace this?

There was a quick coupler in the pressure line outgoing in the pump, I thought that might be the cause, so I plumbed it out and still had the same issue.

I have purchased a Webster Model 077yc001701-lf to replace the cracked pump. this is the OEM pump that came with the loader. I could not use an alternative as there was not enough room to install it. I am sorry but I do not have a link but as I said, this is the same pump that came with the loader.

I currently have the tractor totally stripped down and going to do some replacements/maintenance while the loader is off. The new pump comes in a couple of weeks and I will start putting it back together again.

I will replace most of the hydraulic hoses on the loader, will replace the hydraulic oil filter and drain and clean the tank for the loader so that I can rule out any of those. The oil was clean when I drained it and I can see oil flow thru the hose taking oil to the pump so I doubt those are the issues. I love these old tractors and enjoy tinkering with them, but am so sorry to ask all of these questions when I do this. I do greatly appreciate your help all of the past years. You have helped me navigate through alot of head scratching. Thank you sir. Mark

 

[TheOldHokie]

Good morning Dave. Glad to hear you are handling the new technology well, I too sometimes get overly frustrated with how all of this works.

Thank you for replying. the problem started before the replacement pump. I am only replacing the pump because the housing cracked upon my removal recently. The pump was not leaking before and did a great job. Like we have stated previously, my problem seems to be only when I use the controls to bring the loader down. I am not a hydraulic whiz, but I would think that would be the least laborious on the engine. Maybe a valve in the control body is not letting the oil bypass? Not sure how this works, but the pump should not have to work while lowering the loader would it? I have attached pictures of the valve. Maybe replace this?

There was a quick coupler in the pressure line outgoing in the pump, I thought that might be the cause, so I plumbed it out and still had the same issue.

I have purchased a Webster Model 077yc001701-lf to replace the cracked pump. this is the OEM pump that came with the loader. I could not use an alternative as there was not enough room to install it. I am sorry but I do not have a link but as I said, this is the same pump that came with the loader.

I currently have the tractor totally stripped down and going to do some replacements/maintenance while the loader is off. The new pump comes in a couple of weeks and I will start putting it back together again.

I will replace most of the hydraulic hoses on the loader, will replace the hydraulic oil filter and drain and clean the tank for the loader so that I can rule out any of those. The oil was clean when I drained it and I can see oil flow thru the hose taking oil to the pump so I doubt those are the issues. I love these old tractors and enjoy tinkering with them, but am so sorry to ask all of these questions when I do this. I do greatly appreciate your help all of the past years. You have helped me navigate through alot of head scratching. Thank you sir. Mark

Loading the engine up on lower indicates the exhaust oil from the boom cylinders is blocked and cannot return to sump. Not a lot of places for that to happen. Should be very easy to find.

Dan

 

[Mjordan]

Loading the engine up on lower indicates the exhaust oil from the boom cylinders is blocked and cannot return to sump. Not a lot of places for that to happen. Should be very easy to find.

Dan

Thank you Dan. I like that simple explanation. Simple to troubleshoot? Can you possibly give me some advice? I assume I remove each cylinder and make sure each of the oil ports is clear and when I work the cylinder it shows no obstruction?

Is there a chance that a bypass or relief valve in the controller could be not releasing?

I am just mentioning that, I have no reason to believe it, so any help you can afford on troubleshooting the cylinders would be appreciated sir. Thank you very much for your reply and attention. Mark

 

[TheOldHokie]

Thank you Dan. I like that simple explanation. Simple to troubleshoot? Can you possibly give me some advice? I assume I remove each cylinder and make sure each of the oil ports is clear and when I work the cylinder it shows no obstruction?

Is there a chance that a bypass or relief valve in the controller could be not releasing?

I am just mentioning that, I have no reason to believe it, so any help you can afford on troubleshooting the cylinders would be appreciated sir. Thank you very much for your reply and attention. Mark

Reliefs play no roll here.

1. I would probably start by setting the loader on the ground and removing the rod end pins in the lift cylinders. This allows us to test the operation of the cylinders without worrying about the loader itself. Now start the engine and cycle the loader joystick to raise and lower and see what happens.
2. If you get the same engine loading behavior and slow or no rod retraction shut the tractor off, disconnect the rod end hose at the loader valve. If it has a quick connect on it remove it as well. Stick the end of the hose in a clean bucket and repeat the test. If the rods move and you get oil out of the hose the problem is downstream of the return hose.
3. Next stop is the outlet hose on the loader valve. Disconnect it at the reservoir and stick it in the bucket. Repeat the test as above. If no flow the problem is the quick connect if any or the valve itself.
4. At tis point you need to find a way to eliminate the quick connect and hook the hose directly to the loader valve. Then run the test again. If you get flow at the reservoir its the quick connect. If none its the loader valve.

Dan