JD 1020 power steering

[Tx Jim]

My experians is that that tractor did not came out with powersteering...is there a feedpipe on the right bottom side of the steeringcollom ? Or only a plug ? Is there a plug halveway up the steeringcollom facing backwards ? Then it can be of a lack of oil ?

If tractor came with manual or open center steering then a different pressure line would need to be installed for CC power steering

 

[historyan1975]

Hi,

the tractor surely has power steering and also has feedpipe too,...

 

[historyan1975]

I have a question:what is the function of the shims from the steering column - with these codes - T25741, T22825 and T31290 -? I observed that they have different diametres - are they serving the calibration or do they have other similiar function?!

Totally there are 6 pieces / 3 pieces for each steerin control unit (AL26312 and AL26311).... After me its important how do we put in order the different diameter of the shims after each other?! (The shims diametres are: 0,5 mm, 0,1 mm and 0,25 mm)..................

 

[Tx Jim]

According to JD the shims all have the same ID & OD but different thicknesses. I have no idea of the shims function other than limit travel of the individual(LH/RH) steering valve bodies

 

[historyan1975]

Hi, JIm

Finally - I found what the problem was caused by......................

The T25325 piston and the T25323 rod are assembled with screw thread................AND this screw thread sometime broke as I can see on the attached pictures....




Look at one original new piece and my broken one:

.............. On my piece there is not any screw-thread............

This meant that the piston was only sliding without working as a servomechanism assisted power steering...... Only the manual steering was working.........

If I observed this problem earyler - it would not be necessary to dissamble the whole inside piece PS column .....
Now - I will replace the piston with a new one, and after it I assemble the PS column again - and I hope it is going to work well...........:confused3:
:drink:

 

[Tx Jim]

Thanks for update. I'm glad you located the problem.

 

[chiefts]

i have a john deere 1520 tractor, the hydraulics are not working properly. the power steering, and hydraulics will not go up steadily, after a few minutes it will start to slowly lift, and than it will come and go. Had the filter changed and screen cleaned about 8 months. I know where the filter is located but don't know where the screen is located. Could this the problem again.

 

[DLTTrekkers]

Go under your tractor at the rear and look for a plug with a 1/2' sq. Use only youe powerbar and undo that plug. Remember to drain the oil first

 

[historyan1975]

Hi..... the screen is located behind the hyd oil filter case - as you can see on the attached photo..


Other schemes:


Or - it is possible that the oil transpump is not working well and from this reason the frontal principal oil pump is not getting enough oil.....

Do you have enough hyd oil in the system????!!!

You can find other usefull JD schemes on the given link: John Deere - Parts Catalog

John Deere - Parts Catalog

 

[Tx Jim]

Before even considering replacing trans pump one needs to perform correct diagnostic procedures!!!! Several hyd pumps have been replaced to find out that the hyd pump that was replaced was not causing the problem.