Model 850 Selective Control valve operation -???

The 850 tractor that I have has a Selective Control Valve from a 1050 tractor according to the pictures in the TM1192 manual that I received from Joe (Thanks Joe !).

No problem, as long as it works, I don't care. But does it work?

The inside lever (left lever when sitting in the seat) does not return to center when I let go. The outer lever does.

Should it?

When I let go of the lever, the loader bucket continues to curl. I have to move the lever back to center.

Is this a problem with the spring inside the control valve?
 
The metal tag on the valve says

1431LA
Dukes Fluid Power
1627 FY


There are numbers cast on the valve next to the metal tag

1627-4R <<<< I think it is an R
NCABCD
 
Here's a parts schematic. I'll guess that the sticking spool is dirty or has a broken spring.
mvphoto18525.gif
 

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