110
GZ398
4. Acceptable backlash range is 0.127-0.381 mm (0.005-
0.015 in.).
Correcting Backlash
NOTE: If backlash measurement is within the
acceptable range, no correction is necessary.
1. If backlash measurement is less than specified,
remove an existing shim, measure it, and install a new
thinner shim.
FW-006A
2. If backlash measurement is more than specified,
remove an existing shim, measure it, and install a
thicker shim.
NOTE: Continue to remove, measure, and install
until backlash measurement is within tolerance. Note
the following chart.
3. Once correct gear pattern and backlash are established,
install a new output pinion nut (coated with red Loctite
#263) on the output shaft and tighten to 200 ft-lb.
4. Using an appropriate holding fixture and wrench
adapter, install the secondary drive gear nut (threads
coated with red Loctite #263) and tighten to 200 ft-lb.
The output drive assembly is now ready for installa-
tion.
GZ393B
OIL PUMP ASSEMBLY
Disassembling and Inspecting
1. Remove the oil pump cover; then remove the gerotor
set, shaft, and pin (see Disassembling Crankcase Half
in this sub-section).
2. Inspect the crankcase for scoring, discoloration, or
cracks in the gerotor bore. If scored, crankcase assem-
bly must be replaced.
GZ357
3. Inspect the gerotor set for scoring, discoloration, or
cracks; then using a feeler gauge, check the inner to
outer rotor clearance. If measurements exceed specifi-
cations, the gerotor set must be replaced.
GZ355
4. Inspect the oil pump cover for scoring, discoloration,
or cracks. Replace if damaged.
Backlash Measurement
Shim Correction
Under 0.127 mm (0.005 in.)
Decrease Shim Thickness
At 0.127-0.381 mm (0.005-0.015 in.)
No Correction Required
Over 0.381 mm (0.015 in.)
Increase Shim Thickness