Zetor PROXIMA POWER Z90 2012 Operator's Manual page 16

POLICY OF CORRECT USE FOR PROXIMA POWER TRACTORS
REAR PTO SHAFT – TYPE 540/540E
Following the instructions below when using the rear PTO shaft helps to extend the durability of the clutch.

If the tractor is equipped with rear PTO shaft of the 540/540E type, it should be preferred to use 540E rotation to operate
the rear PTO shaft connected machine when the preferred rotation of the rear PTO shaft is reached with the engine rota-
tion of about 1,600 RPM
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