Pinion Gear, Drive Shaft, And Forward Gear - Mercury 75 Service Manual

13. Replace cam follower if worn or pitted.
14. Replace sliding clutch if jaws are rounded or
chipped. Rounded jaws indicate one or more of
the following:
a. Improper shift cable adjustment.
b. Engine idle speed too high while shifting.
c. Shifting from neutral to reverse (or forward)
too slowly.
a c d
b
f
a - Cam Follower
b - 3 Metal Balls
c - Guide Block
d - Spring
e - Sliding Clutch
f - Jaws
15. Check bearing surfaces of propeller shaft for pit-
ting or wear. If shaft is worn or pitted, replace
shaft and corresponding bearing.
16. Replace propeller shaft if any of the following ex-
ist:
a. Splines are twisted or worn.
b. Oil seal surface is grooved.
c. Shaft has a noticeable "wobble" or is bent
more than 0.009 in. (0.23mm). Prop shaft
trueness should be measured with a dial indi-
cator with prop shaft on V-blocks.
c
a - V-Blocks
b - Bearing Surfaces
c - Measure with Dial Indicator at This Point
90-830234R3 DECEMBER 1997
e
f
51265
b
b
a
51877
Pinion Gear, Drive Shaft, and
Forward Gear
Model
50 Bigfoot (4-Stroke)
60 Bigfoot
75/90/100/115/125
1. Hold drive shaft using Drive Shaft Holding Tool
(91-56775); remove (and discard) pinion nut.
2. Remove drive shaft, pinion gear, bearing and for-
ward gear.
3. Replace pinion gear if it is chipped or worn.
4. Replace bearing and race if either are rusted or
damaged; or if bearing does not roll freely. To re-
move race, refer to "Lower Drive Shaft Bearing
Race," following.
5. Replace forward gear if gear teeth or clutch teeth
are chipped or worn.
a
c
e
d
b
f
a - Drive Shaft Holding Tool (91-56775)
b - Pinion Nut
c - Drive Shaft
d - Pinion Gear
e - Bearing
f - Forward Gear
Drive Shaft Holding Tool
91-56775
91-817070
91-56775
19175
LOWER UNIT - 6A-13