2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 319Get this manual
Right Hand Rotation Unit: Forward GearPinion Gear Back-Up Shim Adjustment Follow the procedure below to adjust forward gearpinion gearPrior to adjustment 1) Install standard pinion gear back-up shim thickness according to design specification mark on the gearChecking driveshaft thrust play 1) Affix the gear adjusting gauge to driveshaft 3A-25
Special tool (A): 0995109530 (Gear adjusting gauge) 2) To check driveshaft thrust play, push the forward gear inward and hold it in this positionSlowly push the driveshaft downward completely, then slowly pull the driveshaft up and read the maximum thrust playDriveshaft thrust play 0.4 0.6 mm (0.016 0.023 in