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Hey folks!
I recently removed my 40 loader from my 445 to put the mower deck on. The manual for the loader states when preparing for loader installation, to "Put the lockout valve in the closed position, by turning T handle clockwise until tight."

The thing is, after removing my loader, the valve was already in the "OPEN" (or turned counterclockwise until tight) position for the loader operation.

Question is:
If mower deck is on, is the T handle supposed to be turned clockwise until tight or counterclockwise until tight???
 

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The function of the lockout valve is to enable/disable the lift cylinder for the mower deck/three point hitch (if fitted).

When using the loader, or other implement that needs the auxiliary hydraulic circuits, (e.g. front blade), the valve is turned clockwise until tight (meaning until it stops turning, don't get carried away and actually try to “tighten” it.) Closing the lock out valve prevents the deck lift cylinder from cycling along with the loader bucket. If the valve is open, the lift cylinder will move until it hits its end of travel and then the bucket will start to move.

When the loader is off and you are mowing, the valve is open, i.e., turned counter clockwise until it stops turning (per page 9 of my mower deck manual) and then the deck lift cylinder operates normally. Deere's solution for when multiple implements are fitted, say a loader and a rear rake or blade with hydraulic angle, which would require a rear second circuit, is to disconnect the hoses of the implement you are not using. Inconvenient, but it works.

The reason the valve needs to be fully open is ensure maximum flow rate in the hydraulic circuit. The reason it needs to be fully closed, obviously, is to “lock out” the deck lift cylinder by preventing any flow in the deck lift circuit.
 
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