..”Tranny pump usually does not make noise
if this disconnect works like you guys describe, than the tranny pump will not be turning with it in disconnect position
so, ...the main pump will not be pumping any oil”..
I already said that!
And his post says the noise starts when the transmission is engaged, thus the noise starts when the main front hydraulic pump starts pumping. Also in his other post he said this tractor has a gas engine which makes the noisy hydraulics seem worse yet.
Are you also going to hop on the 10 and 20 series Deeres DO NOT have noisy hydraulic systems band wagon?
I maybe should have said this earlier, but I think the OP is concerned that this noise is the cause of his transmission woes. I believe it is just the normal racket they make. Granted the closed center system was light years ahead of other brands when it came out and works well. I do not know how this fits in but his tractor probably has a higher GPM pump being a backhoe.