Reconditioning And Replacement Of Parts; Assembly Procedures - Cub Cadet 3000 Series Service Manual

Cub Cadet 3000
Remove the swashplate assembly and cradle
bearings from the housing.
NOTE: The cradle bearings in newer BDU-21L
transmissions are not removable from the housing. If
damage is present, a new housing kit is necessary.
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.
Remove the slot guide block from the displacement
control shaft.
Remove the input shaft lip seal retaining ring.
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.
Remove the bearing spacer washer.
Remove the pump shaft assembly from the housing.
Inspect the splines on the shaft for damage or
unusual wear.
Inspect the bearing. Replacement of the assembly is
recommended if any damage or excessive wear is
found.
Remove the displacement control shaft from the
housing.
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.
DISASSEMBLY PROCEDURES
Inspect the control shaft journal bearing for excessive
wear. The BDU 21 control shaft journal bearing
should be 0.5904 to 0.5908.
Inspect the BDU-21 motor shaft needle bearing for
damage.
If excessive wear or damage is found, replace the
complete housing assembly.
Inspect the center section for damage to the cylinder
block running surface.
Inspect the needle bearing for damage. If any
damage or excessive wear is found, replace the
complete center section assembly.
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RECONDITIONING AND REPLACEMENT OF
PARTS
After disassembly, all parts should be thoroughly
cleaned in a suitable solvent.
Inspect all parts for damage, nicks or unusual wear
patterns. Replace all parts having unusual, excessive
wear or discoloration.
Inspect the sealing surfaces, bearing surfaces, and
shaft splines. Polish the sealing areas on the shafts if
necessary. Replace any worn or damaged parts.
The running surfaces of the cylinder blocks MUST be
flat and free from scratches. If scratches or wear are
found on the running surface of the cylinder block or
center section, polish or replace the parts. When pol-
ishing these surfaces, up to 0.0004 in. may be
removed. If this is not sufficient to obtain a flat surface
free of scratches, the part should be replaced.

ASSEMBLY PROCEDURES

Clean and lightly oil parts prior to assembly of the
BDU transmission.
Be sure to torque all threaded parts to the recom-
mended torque levels.
Replace all o-rings, gaskets and shaft seals.
CAUTION: Most parts have critical high tolerance
surfaces. Care must be exercised to prevent
damage to these surfaces during assembly.
Protect exposed surfaces, openings, and ports
from damage or foreign material.
Install the displacement control shaft.
Install the pump shaft assembly into the housing.
Install the bearing spacer washer.
Install the lip seal and retaining ring as described in
the minor repair section.
Install the slot guide block onto the displacement con-
trol shaft.
Install the swashplate into the housing. The slot on
the swashplate must engage the slot guide block on
the displacement control shaft. Use a tool such as a
screwdriver or scribe to hold the guide block in
position while installing the swashplate.
Hold the swashplate in position and measure the end
play of the displacement control shaft using a dial
indicator or a depth gauge. Using a suitable sleeve,
press the control shaft bearing into the housing until
the control shaft end play is between 0.020" and
0.060".
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