MAJOR REPAIRS
Major repairs described in the following sections are for
the complete disassembly and reassembly (Major
Repair) of the transmission and will void all product war-
ranty, unless license to perform said major repairs was
previously obtained from an authorized representative of
HYDRO-GEAR.
Cleanliness is a primary means of assuring satisfactory
life on repaired units. Cleaning parts by using solvent
wash and air drying is usually adequate. As with any pre-
cision equipment, all parts must be kept free of foreign
materials and chemicals.
Protect all exposed sealing surfaces and open cavities
from damage and foreign material. The outer surfaces
should be cleaned before beginning any repairs.
It is recommended that all O-rings and seals be
replaced. Lightly lubricate all O-rings and seals with a
clean petroleum jelly prior to assembly.
It is recommended that parts requiring replacement be
replaced with the complete assembly (kit) as shown in
the service parts drawings in the beginning of this sec-
tion.
Prior to performing major repairs on the BDU Hydrostatic
Transmission, remove the transmission from its installed
location and remove any external components such as a
cooling fan and input pulley or frame mounting hardware.
NOTE: Thoroughly clean all exposed surfaces prior to
any further disassembly.
Remove the oil lines (hoses and fittings) so that as much
oil as possible can be drained from the housing.
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
1. 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.
2. Remove the center section from the housing.
CAUTION: The cylinder blocks may stick to the
surface of the center section. Exercise caution to
prevent damage to the components.
3. Remove the gasket and two aligning pins from the
housing. The gasket will not be reusable.
4. 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 10cc blocks should
be 0.6295 to 0.6303. 10cc pistons should be 0.6291 to
0.6288.
5. Remove the pump cylinder block spring and thrust
washer from the pump shaft.
6. 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 assem-
bly is recommended if damage or excessive wear is
found.
Figure D-14. Aligning Pins & Gasket
7 - 53
7 Transmission Repair
7D Sauer-Sundstrand BDU-10L-258
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