Cub Cadet BDU-10/21 - Manual (Page 15)

BDU-10/21
BDU-10/21 Major Repair
Page 15
BDU-10S Center Section Removal
BDU-10S Aligning Pins and Gasket
For BDU-10S remove the filter element, filter washer and
spring from the housing.
Remove the pump cylinder block kit from the pump shaft.
Inspect the splines on the shaft and in the pump block for
damage or excessive wear. Check the pistons and block
bores for excessive wear. The pistons should fit with very
little side clearance in the block bores, but must slide
freely. NOTE:The correct bore diameter for 21cc blocks is
0.6776 to 0.6784 while the 10cc blocks should be 0.6295
to 0.6303. 21cc pistons should be 0.6770 to 0.6767 and the
10cc pistons should be 0.6291 to 0.6288.
Remove the pump cylinder block spring and thrust washer
from the pump shaft.
Remove the motor cylinder block kit and shaft assembly
from the housing. Check the pistons and block bores for
excessive wear. The pistons should fit with very little side
clearance in the block bores, but must slide freely. Inspect
the splines for damage or unusual wear. Replacement of
the complete assembly is recommended if damage or
excessive wear is found.
BDU-10S Filter Removal
Disassembly Procedures
Prior to performing major repairs on the BDU remove the
external components as described in the Minor Repairs
section of this manual. These include the following:
Bypass Valve
Charge Check Valves
Charge Pump Assembly
Using a 6 mm internal hex wrench, remove the eight
screws which retain the center section to the housing.
The internal springs of the pistons should separate the
center section from the housing. Remove the center
section from the housing.
CAUTION: The cylinder blocks may stick to the sur-
face of the center section. Exercise caution to pre-
vent damage to the components.
Remove the gasket and two aligning pins from the housing.
The gasket will not be reusable.
Remove Cylinder Blocks