LOWER UNIT - 6A-1990-817643R1 DECEMBER 1996
Pinion Gear Location and Forward
Gear Backlash
DETERMINING PINION GEAR LOCATION
NOTE: Read entire procedure before attempting any
change in shim thickness.
IMPORTANT: Forward gear assembly must be in-
stalled in gear housing when checking pinion gear
depth to obtain accurate shim measurements.
1. Clean the gear housing bearing carrier shoulder and
diameter.
2. Position gear housing upright (driveshaft vertical). In-
stall Bearing Preload Tool in sequence shown.
51270
a
b
c
d
e
f
g
h
i
i
3/4 in. (19mm) I.D.
a - Plate
b - Adaptor: Bearing surfaces clean and free of nicks
c - Thrust Bearing: Oiled and able to move freely
d - Thrust Washer: Clean and free of nicks and bends
e - Spring
f - Nut: Threaded all-the-way onto bolt
g - Bolt: Held snug against spring
h - Sleeve: Holes in sleeve must align with set screws
i - Set Screw (2): Tighten against drive shaft, bolt should not slide on
driveshaft
3. Measure distance (a).
4. Increase distance (a) by 1 in. (25.4mm).
5. Rotate driveshaft 10 revolutions. This properly seats
upper driveshaft tapered roller bearing.
19884
a
b
c
6. Insert Pinion Location Tool (a). Position access hole (b)
as shown. Insert feeler gauge between gauging sur-
face (c) and pinion gear (d).
51265
a
b
c
d
a - Pinion Location Tool (91-817008A2)
b - Access Hole
c - Gauging Surface
d - Pinion Gear
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