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7 Transmission Repair
7B Sauer-Sundstrand BDU-21L-207
Charge Check Valves
1. Remove the check valve plug with a 1/4” internal hex
wrench .
2. Remove the valve spring and check ball (or poppet)
from the transmission center section or pump end
cap.
CAUTION
Do not allow the check balls to fall into the
closed loop passages in the center section or
end cap.
3. Inspect the check balls (or poppets) and mating seats
in the center section or end cap for damage or for-
eign material.
4. Lay the transmission or pump on its side and reinstall
the check ball (or poppet), spring, and plug (with O-
ring) into the center section or end cap. Be certain
the check ball does not fall into the closed loop pas-
sage.
5. Torque the plug to 15 to 35 ft.lbs. (28 to 47 Nm).
6. Turn the unit over and repeat for the other check
valve.
Figure B-9. Check Valve Removal/Installation
Figure B-10. Check Valve Diagram
A. Check Ball Assembly B. Poppet Assembly
C. Check Valve Plug D. Rubber O-Ring
E. Spring F. Check Ball
G. Poppet H. Check Valve Plug
A
B
C
D
E
F
G
E
D
H
Poppet
Check Valve Ball
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