Cub Cadet BDU-10/21 - Manual (Page 13)

BDU-10/21
BDU-10/21
For BDU-21L: Install the charge relief valve spring and ball.
Install the drive pin. Install the gerotor assembly. Install a
new o-ring and the charge pump cover. NOTE:The charge
relief spring must enter the recessed hole in the charge
pump cover. Torque the bolts evenly to 12-15 ft.lbs.
(16.3-20.3 Nm).
For BDU-10L models with through shaft: Install the
charge relief valve spring and ball. Install a new o-ring and
the spacer plate onto the aligning pins paying attention to
the correct orientation. NOTE:The charge relief spring
must enter the recessed hole in the spacer plate. Install the
charge pump drive pin. Install the gerotor assembly. Install
a new o-ring and charge pump cover. Torque the bolts
evenly to 7-10 ft.lbs. (9.5-13.5 Nm).
Page 13
Minor Repair
BDU-10L Charge Pump Components
BDU-10L Through Shaft Charge Pump Components
Disassembly Procedures
Using a 5 or 6mm internal hex wrench, remove the two (2)
screws holding the charge pump cover to the center
section.
Remove the charge pump cover and o-ring. Avoid turning
or twisting the charge cover during removal, or damage
to the charge relief valve spring may occur.
Remove the charge pump gerotor assembly.
For BDU-21L with implement circuit: Remove the
charge pump shim, two aligning pins, two o-rings, the
gerotor assembly and the charge pump drive pin. Make
note of the top and/or bottom of the gerotor assembly.
For BDU-21L: Remove the charge pump drive pin.
For BDU-10L with a through shaft: Remove the charge
pump drive pin, spacer plate and o-ring. Make note of the
top and/or bottom of the spacer plate.
Remove the charge relief valve spring and ball.
NOTE: The BDU-21L with implement circuit has the charge
relief valve spring and ball in the charge pump cover.
Inspect the gerotor assembly, charge pump cover, and
center section (or spacer plate) for abnormal wear, damage
or foreign material. Inspect the charge relief valve ball and
spring. Inspect the charge relief valve seat in the center
section for damage or foreign material.
Assembly Procedures
Prior to reassembly of the charge pump, apply a small
quantity of petroleum jelly to the I.D., O.D., and faces of the
gerotor assembly.
NOTE: Improper assembly of the charge relief valve spring
and ball, or the incorrect orientation of the charge cover will
cause a priming failure. If assembled properly, the charge
pressure should be maintained at 25 to 70 PSI
(1.72-4.82 bar) at 3000 RPM pump speed.
For BDU-10L Install the charge relief valve spring and ball.
Install the gerotor assembly. Install a new o-ring and the
charge pump cover. NOTE:The charge relief spring must
enter the recessed hole in the charge pump cover. Torque
the bolts evenly to 7-10 ft.lbs. (9.5-13.5 Nm).