LOWER UNIT - 6B-2590-817643R1 DECEMBER 1996
Forward Gear, Lower Drive Shaft
Bearing, Pinion Gear, and Drive Shaft
Installation
1. Install components in sequence shown.
19175
d
e
d
b
c
f
a
a - Forward Gear/Bearing: Work Quicksilver gear lube into
bearing rollers.
b - Lower Drive Shaft Tapered Roller Bearing: Work Quicksilver
gear lube into bearing rollers.
c - Pinion Gear
d - Drive Shaft
e - Drive Shaft Holding Tool (91-817070)
f - Pinion Nut (New): Apply Loctite 271 to threads during final
assembly (after pinion gear depth and forward gear
backlash have been set), torque to 70 lb. ft. (95 N·m).
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 (91-14311A1)
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 (25.4mm).
5. Rotate drive shaft 5 to 10 revolutions. This should
properly seat upper drive shaft tapered roller bear-
ing.
19884
a
b
c
a - 1“ (25.4mm)
b - Nut
c - Bolt Head
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