220
GEARCASE
SHIMMING AND GEAR BACKLASH CHECKS
SHIMMING AND GEAR
BACKLASH CHECKS
If the gearcase has been rebuilt or any internal
components have been replaced, the gears must
be properly shimmed and adjusted to ensure
smooth, reliable operation of the gears.
Checking the Forward Gear-to-
Pinion Gear Backlash
Install the driveshaft and bearing housing assem-
bly without Gasket Sealing Compound.
Install and tighten the pinion nut without Nut Lock
to a torque of 13 ft. lbs. (18 N·m).
Temporarily fasten the driveshaft bearing housing
to the gearcase using two (2) bolts and nuts
placed through the two diagonally opposite gear-
case mounting holes.
Hold the pinion gear by hand, then gently rock the
forward gear back and forth by hand.
• If the backlash is greater than the specification,
the thickness of the forward gear shim must be
increased.
• If the backlash is less than the specification, the
thickness of the forward gear shim must be
decreased.
1. Pinion gear shim
2. Forward gear shim
3. Forward gear thrust washer
4. Reverse gear thrust washer
5. Reverse gear shim
001901
Item Available
thickness (mm)
Design spec
thickness (mm)
Pinion gear
shim
1.7, 1.8, 1.9, 2.0,
2.1, 2.2
2.0
Forward gear
shim
0.8, 0.9, 1.0, 1.1,
1.2, 1.3, 1.4, 1.5
1.2
Forward gear
thrust washer
2.0 2.0
Reverse gear
thrust washer
1.6, 1.8, 2.0, 2.2,
2.4, 2.6
2.0
Reverse gear
shim
0.2, 0.5, 0.8, 1.0 1.5
1
2
3
4
5
1. Bolts (2) 001888
001902
Forward Gear to Pinion Gear Backlash
0.004 – 0.008 in. (0.10 – 0.20 mm)
1
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