Suzuki DF 90 Service Manual page 271

PINION NUT
Apply Thread Lock 1342 to threads of pinion nut, then tighten
nut to specified torque.
Pinion nut : 100 N . m (10.0 kg-m, 72.5 lb.-ft.)
99000-32050 : Thread Lock 1342
09921-29410 : Drive shaft holder
CHECKING DRIVESHAFT THRUST PLAY
Before installing reverse gear, driveshaft thrust play should be
checked.
(See CHECKING DRIVESHAFT THRUST PLAY section on
page 9-27)
09951-09530 : Gear adjusting gauge
PROPELLER SHAFT
1. Slide clutch dog shifter 2 onto propeller shaft 1.
NOTE:
For correct installation, side of clutch dog shifter which should
face towards reverse gear is marked with letter "R".
2. Insert connector pin 3 into propeller shaft.
3. Align holes in clutch dog shifter 2 and connector pin 3,
then slide dog pin 4 through them.
4. Install dog spring 5, ensuring that it fits snugly into groove
on clutch dog shifter.
LOWER UNIT 9-17