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Tractor Stack Valve Modifications S/N 398796 & Down
Tractor Stack Valve
Modification:
9.
Shuttle Check Disk. The replacement
LH End Plate is shipped with a Shuttle Check
Disk insert into it. This Disk must not fall out; it is
coated with grease to hold it in. Check to make
sure it is in the proper recessed are of End Plate
(See Figure 10)
10.
End Plate O-Rings. There are 4 O-Rings
total, a large one around the outside, a very small
round one, one in a tear drop shaped recess and
one in a square shaped recess. All the O-Rings
are round, it is the recessed shaped that holds
them different. O-rings are coated with grease to
help hold them. Make sure al these O-Rings are
in Place (See Figure 10). Make sure none of
these slip out.
11.
Install Replacement End Plate Gasket.
Install the Replacement End Plate with the Bleed
Off Adjustment Plug up and the Load Sense Port
Elbow in the down position. (See Figure 11).
Using the same three nuts that retained the
original End Plate bolt the new one on. When
tightening the Nuts do it in an alternating pattern
so the End Plate will be tightened slowly and
evenly. These 3 Nuts should torque to approx. 25
ft lbs.
12.
Remove C-Clamps from Stack Valve.
Only remove C- Clamps after inspection. In-
spect the End Plate Change to be sure that all the
components have been tightened and the Load
Sense Elbow in pointing in the correct direction
(See Figure 12). Figure 12 is what your Stack
Valve LH End Plate should look like now with the
C-Clamps removed.
13.
Stack Valve Operation. Do Not try to
operate Tractor or tractor Hydraulics untill all
Assembly is completed. If Tractor Hydraulic have
a problem when tried always come back to the
Stack Valve to Check for trouble or something in
one of the Valve Sections.
Machete (JD -62,63,6420 Asy Man) 10/04
© 2004 Alamo Group Inc.
Shuttle Check Disk
Small Round
O-Ring
Figure 10
Figure 11
Figure 12
Section 5 - 5
Tear Drop
Shaped O-ring
Square O-Ring
Large Round
O-Ring
Bleed Off Adjustment
Plug with Plastic Plug
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