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7 Transmission Repair
7B Sauer-Sundstrand BDU-21L-207
Minor Repair
General
Minor Repairs may be performed, following the proce-
dures in this section, without voiding the unit warranty.
Cleanliness is a primary means of assuring satisfactory
transmission life, on either new or repaired units.
Cleaning parts by using a clean solvent wash and air
drying is usually adequate. As with any precision equip-
ment, all parts must be kept free of foreign materials and
chemicals.
Protect all exposed sealing surfaces and open cavities
from damage and foreign material.
It is recommended that all O-rings be replaced. Lightly
lubricate all O-rings with clean petroleum jelly prior to
assembly.
Plug / Fitting Torques
If any plugs were removed from the housing, center sec-
tion, or end cap during servicing, they should be torqued
as indicated in the accompanying tables:
ITEM TORQUE
Housing Plugs/Drains 29 to 50 ft. lbs.
(3/4-16 or 7/8-14 O-Ring) (39 to 68 Nm)
Bypass Passage Plug 56 to 50 ft.lbs.
(1/16-27 Pipe (6.4 to 16 Nm)
Loop Plugs 29 to 50 ft.lbs
(3/4-16 O-Ring) (39 to 68 Nm)
Inlet Fitting/Plug 15 to 35 ft.lbs.
(9/16-18 O-Ring) (20 to 47 Nm)
Plastic Inlet Fitting 25 to 30 in.lbs.
(M6 Screw) (2.8 to 3.4 Nm)
Figure B-4. Sauer-Sundstrand Hydrostatic Drive Unit
BDU-21-L-207
Figure B-5 Minor Repairs
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