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After a lot of reading this is what I've found.

The Zetor power steer can use either ATF or STOU.
ATF is preferred as it's viscosity remains constant when outside temperature changes. STOU tends to get thicker in cold weather making the power steer less responsive.

There is a simple metal screen and a large magnet built into the filler cap. The return fluid flows through this screen and magnet before dropping into the tank.

The 6745 with STOU in the power steer is used solely for my hay baler, so never sees cold weather. So I'll likely just top up the STOU.

The 6745 with ATF in it is my year round tractor, so I'll top it up with ATF.

On both tractors I will paint onto the top of the power steer tank the fluid type that it is filled with.

[QUOTE="mpr128, post: 19575, member: 1174"] After a lot of reading this is what I've found. The Zetor power steer can use either ATF or STOU. ATF is preferred as it's viscosity remains constant when outside temperature changes. STOU tends to get thicker in cold weather making the power steer less responsive. There is a simple metal screen and a large magnet built into the filler cap. The return fluid flows through this screen and magnet before dropping into the tank. The 6745 with STOU in the power steer is used solely for my hay baler, so never sees cold weather. So I'll likely just top up the STOU. The 6745 with ATF in it is my year round tractor, so I'll top it up with ATF. On both tractors I will paint onto the top of the power steer tank the fluid type that it is filled with. [/QUOTE]

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