Mixing hydro fluids?

[fruitcakesa]

The prior owner of the M4 071 used Napa premium hydro fluid for all the hydraulic services during the 1800 hrs he owned it with no apparent problems. I have always used Kubota Sudt for service on my other tractors.
Can Sudt be mixed safely with other “compatible” fluids?

 

[TheOldHokie]

The prior owner of the M4 071 used Napa premium hydro fluid for all the hydraulic services during the 1800 hrs he owned it with no apparent problems. I have always used Kubota Sudt for service on my other tractors.
Can Sudt be mixed safely with other “compatible” fluids?

Yes.

Dan

 

[Trash Panda]

Mixing fluids is fine.

Mixing viscosities is not.

 

[fruitcakesa]

Thanks for the advice

 

[fruitcakesa]

Would the same be true for front axle?80/90 vs Sudt? Are they compatible?

 

[Trash Panda]

Would the same be true for front axle?80/90 vs Sudt? Are they compatible?

Are you draining and refilling the axle? Or are we just talking about a top-off here.

 

[McMXi]

Would the same be true for front axle?80/90 vs Sudt? Are they compatible?

The front differential and axle hold around 2 gallons so draining and filling isn't such a big deal, but the transmission case at 15 gallons or so is an expensive proposition. I'm not in need of changing the oil yet, but when I do, I'm going to look at options in addition to UDT2. My local dealer's pricing is on par with Messick's but without the shipping cost, so today it would probably cost around $425 to drain and replace the transmission oil in my M6060, plus filters of course, so maybe $550 all in. On the up side, I'm not doing this every year.

I'm making the reasonable assumption that the M4 is basically the same as the M6060/M7060 in terms of fluid capacities.