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7 Transmission Repair
7B Sauer-Sundstrand BDU-21L-207
8. Remove the motor thrust bearing assembly from the
housing.
The cradle bearings are not removable from the housing.
If damage is present, a new housing kit is necessary.
9. Inspect the cradle bearing’s low friction coating for
wear. Inspect the swashplate and thrust bearing for
any unusual wear or damage. If damage to the
swashplate or cradle bearings is found then inspect
the housing for possible damage. Replace complete
assemblies as necessary.
10. Remove the slot guide block from the displacement
control shaft.
11. Pull the lip seal out of the housing bore. A hook type
tool may be used to pry the seal out. Care must be
taken to avoid damage to the housing bore, shaft
sealing surface or bearing. Once removed, the seal is
not reusable.
12. Remove the bearing spacer washer.
13. Remove the pump shaft assembly from the housing.
14. Inspect the splines on the shaft for damage or unusu-
al wear.
15. Inspect the bearing. Replacement of the assembly is
recommended if any damage or excessive wear is
found .
16. Remove the displacement control shaft from the
housing.
17. Remove the displacement control shaft lip seal from
the housing. Care must be taken to avoid damage to
the housing bore.
INSPECT THE HOUSING FOR DAMAGE.
1. Inspect the control shaft journal bearing for excessive
wear. The control shaft journal bearing should be
0.5904 to 0.5908.
2. Inspect the motor shaft needle bearing for damage.
If excessive wear or damage is found, replace the com-
plete housing assembly.
3. Inspect the center section for damage to the cylinder
block running surface.
4. Inspect the needle bearing for damage. If any dam-
age or excessive wear is found, replace the complete
center section assembly.
Figure B-16. 21CC Cylinder Block Kit Components
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