7 - 26
7 Transmission Repair
7B Sauer-Sundstrand BDU-21L-207
9. 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”.
10. Install the thrust washer and pump cylinder block
spring onto the pump shaft.
11. Install the springs piston washers and pistons into the
cylinder block. The pistons must move freely in their
bores.
NOTE: To simplify the installation of both the motor block
and the pump block kits, wrap a rubber band snugly
around the pistons. This is intended to hold the pistons in
their bores as the block kits are handled during installa-
tion.
12. With the swashplate in the “neutral” (0 angle) position
and the transmission housing laying on its side,
install the pump cylinder block kit onto the pump shaft
in the housing.
13. Install the motor thrust bearing into the housing.
NOTE: It will be necessary to have a DRY journal bear-
ing to prevent a hydraulic lock while installing the motor
shaft
14. Install the motor shaft/cylinder block kit. Use caution
to prevent damage to the journal bearing while guid-
ing the shaft into position. Once installed, it will be
necessary to hold the assembly in position until the
center section has been installed.
15. Lubricate the running surfaces of the cylinder blocks
and the center section.
16. Position the housing with the housing opening UP,
and install the center section onto the housing while
holding the motor shaft in position in the housing jour-
nal bearing.
CAUTION: Make sure all parts are properly
aligned. Do not use excessive force.
17. Install the eight bolts and torque evenly to 18-21
ft.lbs..
18. Rotate the shafts a minimum of two turns to assure
correct assembly. When properly assembled the
shafts should require minimal torque to turn.
(Approximate 15 in. Ibs. - maximum)
Refer to the Minor Repairs section in this manual to com-
plete reassembly of the BDU transmission.
Figure B-18. Swashplate Changes
Figure B-19. Swashplate Components
Summary of Contents for 1691766
Page 2: ......
Page 20: ...2 Troubleshooting Notes 2 4 ...
Page 34: ...3 14 3 Maintenance Notes ...
Page 86: ...6 General Repair 6A Steering Front Wheel Repair Notes 6 16 ...
Page 130: ...6 60 6 General Repair 6C Foot Controls Repair ...
Page 188: ...7 46 7 Transmission Repair 7C Hydro Gear 216 3010L ...
Page 240: ...8 20 8 Mower Deck Repair Notes ...