What is the flow control valve for?

dsebens

Member
On my 3400. Is it for how fast the 3pt drops? Also I didn t do anything about it but the rod sticks in the axle housing. If I unscrew the regulator valve you feel no pressure. When I had the lift cover off I could push the rod down and put tension on the screw adjuster. What s going on with it? Even with heavy weight on the 3 pt it doesn t push back on it
 
Flow contron valve adjusts how much oil
goes from the pump to the lift cover and
affects both your 3 point lift speed and
the speed of any remote cylinders you may
be using. It works by dumping an
adjustable portion of oil back into the
sump. I dont remember which way is
slowest - in or out but try screwing it
all the way in and lift your 3 point.
Then screw it out and lift the 3 point
again. You will notice it slows down the
rate of lift considerably.
In 16 years of having it on one tractor
or another I have never found a need to
use it and have forgotten it's even
there. Ford thought it was pretty cool
though as they make kind of a big deal
about it in some of their original
literature.
It does not affect the drop on the 3
point. Only the lift.

As to the second part of your post:

"Also I didn t do anything about it but
the rod sticks in the axle housing."

I don't understand what you are referring
to at all.
 
It affects the speed of 3 point lifting in small increments. There is a cam that overrides for full lift. More noticeable when using draft position.
 
When i had the lift cover off it moved a linkage and was moving a 3/8"ish rod up and down. Number 34 in the diagram
mvphoto55041.png
 
The main reason for flow control was when using a mouldboard plough in draft control. The main competition here in England was the MF range and their method of weight transfer to the rear wheels when slip occurred was to quickly lift the plough, then their flow control slowed the rate the plough returned to full dept. This caused a very uneven furrow bottom and earnt the tractor the name of a "lazy tractor" because it lifted implements out of work.

The Ford method was to adjust the lift rate so that a little lift from a slow acting setting only put enough weight on the rear wheels to get through the tough patch. The plough then return quickly to the required depth. Through the internal linkage the flow control was moved to fast when the lift lever passed a set point on the quadrant giving you a fast lift at the end of the furrow. I have used it to my advantage many times when demonstrating or when ploughing at vintage plough days with my Dexta.
 

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