New holland tn65 hydraulic squealing

[picanoor]

My tn 65 has a squealing sound, this started after I changed all the filters and hydraulic oil. It mostly only appears after I use the steering, then when I stop steering 10-20 seconds later the squealing stops as well.
I loosened the pressure line from the steering pump and notice foaming oil coming out. So it must suck some air in it somewhere.
I have posted this problem in other posts earlier and used the ideas from others to see if could fix it, but no luck yet.
I Put a new hose between the hydraulic suction line and the filter double clamps, removed filters cleaned all areas put them back, checked oil level, over filled a little.

Sometimes the squealing does not start till after a couple of minutes. Model is 2005 8x forwards x 8 backwards,
Any help,input is greatly appreciated..

 

[boomer1025]

What kind of oil and filters did you use? Over fill or under the system ? Sounds like the pump can't get enough oil. Bad Filter or line thats sucking shut maybe.

 

[picanoor]

Thanks for your reply,
I got the filter from the local new Holland dealer, (I live south of Houston Texas), main suction filter is: CNH 84257511, pressure filter,I threw my box away, but also from local dealer, oil if from local tractor supply Xtreme hydraulic and transmission fluid, ford new Holland ESN, or M2C 134,b,c.
pete

 

[picanoor]

just did an other check: started the tractor no use of steering and no hydraulics, no noise. after 5 minutes I drive forwards and backwards, lift fel, rear hydraulics 3 points and the noise started again. When the noise stopped, I steered left and right, squealing noise starts again, when I stop steering wait about 20 seconds noise stops. I need help here, Thanks. pete

 

[picanoor]

After reading all replies on similar issues, I decided to change out all o rings , and the $92 hose on the suction side of both hydraulic pumps, and yes problem is gone!