6A-26 - LOWER UNIT 90-830234R3 DECEMBER 1997
Pinion Gear Depth and Forward Gear
Backlash
DETERMINING PINION GEAR DEPTH
NOTE: Read entire procedure before attempting any
change in shim thickness.
IMPORTANT: Forward gear assembly must be
installed in gear housing when checking pinion
gear depth or an inaccurate measurement will be
obtained.
1. Clean the gear housing bearing carrier shoulder
and diameter.
2. With gear housing positioned up right (drive shaft
vertical), install Bearing Preload Tool (91-14311A2)
over drive shaft in sequence shown.
g
h
h
e
f
c
b
a
d
a - Adaptor: Bearing surfaces clean and free of nicks
b - Thrust Bearing: Oiled and able to move freely
c - Thrust Washer: Clean and free of nicks and bends
d - Spring
e - Nut: Threaded all the way onto bolt
f - Bolt: Held snug against spring
g - Sleeve: Holes in sleeve must align with set screws
h - Set Screw (2): Tightened against drive shaft, bolt should
not slide on drive shaft.
3. Measure distance between top of nut and bottom
of bolt head.
4. Increase distance by 1 in. (25.4mm).
5. Rotate drive shaft 5 to 10 revolutions. This should
properly seat upper drive shaft tapered roller
bearing.
a
b
c
19884
a - 1 in. (25.4mm)
b - Nut
c - Bolt Head
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