Help please, 09 TYM T330 hydrostat with ratcheting sound from the rear.

[Vmax540]

Hello, I have a 2009 TYM T330 with a LT300H F.E.L and backhoe and tires are loaded. With front bucket edge vertically down to back drag and level a ground pile of hard clay and rock in low range and all of a sudden I hear this metal like gear ratcheting/skipping sound from the rear. Tractor still moves in all ranges fwd/reverse without any sound. It is only when under fairly heavy load will it ratchet or skip. On another note as I have mentioned before the front tires spin in or out of 4wd. This sounds expensive... Thanks for any help.

 

[K5lwq]

I would start by marking the rear tires to the rims. With loaded tires it is not uncommon for the rims to spin in the tire and could make a sound like you describe. Try working it again then see if the mark moves. Solution is put a little more air in the rear tires.

 

[JTKub]

Have you checked the filters/oil for metal?

 

[Vmax540]

Thanks for the replies, it really does sound like metal on metal although I can't imagine any main gear('s) slipping on each other and still operate normally in all ranges with no sound unless under heavy load. Also, one would think the hydrostat would go/slip before steel gears strip ? Even though it only has ~900 hours I still change the transmission filter each fall so, I will go ahead and do it now. I marked the tires.