Farm Equipment - Transport valve settings

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Transport valve settings

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=47846
Printed Date: 28 Aug 2025 at 4:25pm
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Topic: Transport valve settings

Posted By: Ky.Allis
Subject: Transport valve settings
Date Posted: 24 Mar 2012 at 5:51pm

On a D-17 ser.3---To plow with 2 bottom SC plow,Do I turn knob out or in? I have misplaced my owners manual and the decal on the valve is worn off. Thanks for any help!!! And what is the purpose of the transport valve?

Replies:

Posted By: D-17_Dave
Date Posted: 24 Mar 2012 at 6:51pm

The transport valve controls the leakdown time of the implement after it has been raised by the draft control. After it has raised it will return to the desired depth as the valve slowly returns oil back into the tractor. The wheel adjustment controls this return time.

I can't remember for sure but I think turning the wheel in is the faster setting for lowering.

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Yea, I can fix that.....

Posted By: DanD
Date Posted: 24 Mar 2012 at 8:54pm

The purpose of the transport valve is to allow the use of the traction booster weight transfer system when pulling semi mounted snap coupler implements with their own transport wheels. The obvious implements this would apply to are plows with a trailing wheel and ram and discs with transport wheels and a ram. The transport valve prevents the flow of hydraulic oil to the implement's ram when the system is operating at the lower pressures at which the traction booster operates. It only allows oil to flow to the internal ram so that weight is transferred via the lift arms to the rear wheels of the tractor. When you move the hydraulic lever to the lift position, the lift arms lift fully, and then pressure rises sufficiently in the hydraulic system to force oil through the transport valve to the remote cylinder, thus raising the implement. Working depth of the implement would be controlled by the adjustments on the implement itself. The transport valve does not affect the working depth of the implement.
For your fully mounted two bottom plow, the transport valve is unnecessary.
I can't remember off the top of my head whether the valve control needs to be turned clockwise or counter clockwise for the valve to function. Turned in one direction, it's just like the valve is not even there, which is what you want for fully mounted implements. Turned fully in the other direction, it will function as I described above. You can check it as follows. Raise the plow fully and place the hydraulic lever in the hold position. Then, turn the transport valve control fully in one direction, then turn it fully in the other direction. When adjusted to function for the semi mounted implements, the lift arms will leak down. When adjusted the way you want it for your fully mounted plow, it will hold. The valve control should be turned fully in one direction or the other during use.

Posted By: Dave (Mid-MI)
Date Posted: 25 Mar 2012 at 7:54am

Turn the adjusting knob fully clockwise for use with a mounted implement.