Hydraulic problem / questions

rjfoster · May 19, 2006

I have a compact tractor with a front end loader and rear blade. The loader worked fine, but is now experiencing problems. Without a load placed on it, the front end loader seems slow but is able to move as it should. Lifting any type of load becomes the issue- it will not do this.

The 3-point hitch / rear blade works as it should and without any hesitation.

I have changed the fluid, cleaned the hydraulic screen (was not what I would consider "dirty") and double checked the fluid level afterwards. Hoses and connections look very good. Can't find any visible leaks.

Anyone have any additional thoughts as to:

1. what else I could check or a systematic method to narrow the problem down
2. how to check whether the hydraulic pump is weak or bad

Thanks for any help.

/forums/images/graemlins/confused.gif

rjfoster · May 19, 2006

I have a compact tractor with a front end loader and rear blade. The loader worked fine, but is now experiencing problems. Without a load placed on it, the front end loader seems slow but is able to move as it should. Lifting any type of load becomes the issue- it will not do this.

The 3-point hitch / rear blade works as it should and without any hesitation.

I have changed the fluid, cleaned the hydraulic screen (was not what I would consider "dirty") and double checked the fluid level afterwards. Hoses and connections look very good. Can't find any visible leaks.

Anyone have any additional thoughts as to:

1. what else I could check or a systematic method to narrow the problem down
2. how to check whether the hydraulic pump is weak or bad

Thanks for any help.

/forums/images/graemlins/confused.gif

MadReferee · May 19, 2006

Swap the work port hoses on the loader valve. In other words, make the lift cylinder hoses the curl cylinder hoses. Now see if your lift problem goes away or moves to the curl function.

Also did you change all hydraulic filters and cleaned all screens? Some tractors have more than one of each.

Since you didn't fill out your profile with your location and tractor type there is not much else I can suggest. If you let us know what you have then maybe we can get more specific.

MadReferee · May 19, 2006

Swap the work port hoses on the loader valve. In other words, make the lift cylinder hoses the curl cylinder hoses. Now see if your lift problem goes away or moves to the curl function.

Also did you change all hydraulic filters and cleaned all screens? Some tractors have more than one of each.

Since you didn't fill out your profile with your location and tractor type there is not much else I can suggest. If you let us know what you have then maybe we can get more specific.

rjfoster · May 19, 2006

Unfortunately, the problem is actually affecting both the lifting and curling movements.

After draining the hydraulic fluid, I cleaned the one screen that I found.

Additional information:
Yanmar 1500D / NC

rjfoster · May 19, 2006

Unfortunately, the problem is actually affecting both the lifting and curling movements.

After draining the hydraulic fluid, I cleaned the one screen that I found.

Additional information:
Yanmar 1500D / NC

MadReferee · May 19, 2006

Here are some suggestions: <ul type="square"> [*]The pressure relief valve internal to the loader valve may be defective [*]The loader valve could have an internal blockage [/list] Since the 3pt works you would have to assume the pump is functioning normally.

MadReferee · May 19, 2006

Here are some suggestions: <ul type="square"> [*]The pressure relief valve internal to the loader valve may be defective [*]The loader valve could have an internal blockage [/list] Since the 3pt works you would have to assume the pump is functioning normally.

rjfoster · May 19, 2006

Thanks for the suggestions of things to look at. Since I am new to tractors, I have to ask:

Where will the pressure relief valve be located? I have some manuals on the tractor, but not on the loader it's manual control.

rjfoster · May 19, 2006

Thanks for the suggestions of things to look at. Since I am new to tractors, I have to ask:

Where will the pressure relief valve be located? I have some manuals on the tractor, but not on the loader it's manual control.

MadReferee · May 20, 2006

Most tractors wil have 2 relief valves. The first is the system relief and it is located near the 3pt. The other is in the loader valve itself. It would be a cartridge that just unscrews.

MadReferee · May 20, 2006

Most tractors wil have 2 relief valves. The first is the system relief and it is located near the 3pt. The other is in the loader valve itself. It would be a cartridge that just unscrews.

rjfoster · May 20, 2006

Regarding the loader relief valve- will this be located at the loader control AND does the fluid need to be drained prior to removing and inspecting the valve?

Also- when I raise the loader to full up and raise the rear blade fully up, the engine noise, for lack of the wrong words, changes to compensate for the "load". Can I assume that this is a normal finding, since the fluid is now under an increased pressure or does this tell you anything regarding the hydraulic pump?

rjfoster · May 20, 2006

Regarding the loader relief valve- will this be located at the loader control AND does the fluid need to be drained prior to removing and inspecting the valve?

Also- when I raise the loader to full up and raise the rear blade fully up, the engine noise, for lack of the wrong words, changes to compensate for the "load". Can I assume that this is a normal finding, since the fluid is now under an increased pressure or does this tell you anything regarding the hydraulic pump?

Farwell · May 20, 2006

The FEL relief valve on my John Deere is located on the control valve as a part of the control valve system and is adjustable.
To get information that is specific to your brand of tractor you may want to go the Forum that matches your make of tractor. The folks there will probably be better qualified to answer your questions.
Farwell

Farwell · May 20, 2006

The FEL relief valve on my John Deere is located on the control valve as a part of the control valve system and is adjustable.
To get information that is specific to your brand of tractor you may want to go the Forum that matches your make of tractor. The folks there will probably be better qualified to answer your questions.
Farwell

rjfoster · May 20, 2006

Do you have to drain the fluid if removing the valve to inspect it?

rjfoster · May 20, 2006

Do you have to drain the fluid if removing the valve to inspect it?

MadReferee · May 20, 2006

( Do you have to drain the fluid if removing the valve to inspect it?)

No, but there will be some residual fluid in the lines, just enough to make a mess but not more than a few tablespoons full.

The suggestion about going to the Yanmar forum is a good one. Maybe someone there can help you, especially in obtaining a workshop manual for the loader.

MadReferee · May 20, 2006

( Do you have to drain the fluid if removing the valve to inspect it?)

No, but there will be some residual fluid in the lines, just enough to make a mess but not more than a few tablespoons full.

The suggestion about going to the Yanmar forum is a good one. Maybe someone there can help you, especially in obtaining a workshop manual for the loader.