Volvo Penta AQUAMATIC 280 Workshop Manual page 120

47. If the contact pattern is toward the root of the
tooth and at the big end, the shims should be in-
creased under the front and rear roller bearing (1, fig-
ure under point 44). To maintain correct bearing
preload, reduce the shims under the intermediate
bearing (3) by a corresponding amount. To maintain
the correct backlash, increase the shims under the
vertical shaft ball bearing (2).
48. If the contact pattern is too far toward the top of
the tooth and toward the small end, reduce the shim
thickness for under the front and rear roller bearing (1,
figure under point 44). To maintain proper bearing
preload, increase the shim thickness correspondingly
under the intermediate bearing (3). To maintain the
correct backlash, decrease the shim thickness under
the vertical shaft ball bearing (2).
Final assembly
1. After the correct preload, backlash, and contact
pattern have been obtained, remove the preload tool
and tighten the vertical shaft nut. Remove the bear-
ing box and outer propeller shaft.
2. Remove and discard the old pinion gear nut.
Grease the threads of the vertical shaft. Install a new
nut with the groove against the pinion gear. Tighten to
110 Nm (81 lb.ft.).
Repair instructions
117