Suzuki DF 25 Service Manual page 228

10-4 LOWER UNIT
Hold the pinion nut securely, then fit special tool to the driveshaft
and loosen the pinion nut.
09921-29510 : Driveshaft holder
Remove the two (2) bolts 9 securing the driveshaft bearing
housing to the gearcase.
To separate the bearing housing from the gearcase, use two
(2) 6mm bolts A as screw jacks, by alternately turning each
one equally.
This will keep the housing level as it pushed off the gearcase.
Lift out driveshaft 1 and driveshaft bearing housing assembly
2.
Remove the pinion gear 1.
Remove the forward gear 2 (with thrust washer 5, back-up
shim 4 and bearing 3)