Bearing Adjustment - Yanmar 1GM User Manual

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3. Push in the detent pin, remove the snap ring and re-
move the pin and springs.
4. Use a screwdriver or suitable tool to pry out the seal.
5. Inspect the shift ring. Check the detent notch for exces-
sive wear that will allow poor clutch engagement.
6. Inspect the detent pin. Replace the pin if it is damaged
or excessively worn.
7. The shift ring contact surface of the shift fork is plated
with molybdenum. Renew the shift fork if the plating is
peeled or the shift fork base metal is exposed.
8. Reassemble the shifter by reversing the disassembly
procedure. Install the shift lever so the triangle mark on
the lever is out.
Reassembly
I. If removed, install the outer bearing races into the
transmission case and mounting flange.
2. Apply sealer to the periphery ofthe oil seals and install
them into the transmission case and mounting flange with
the open side to the inside.
3. Install the input shaft into the transmission case.
4. Install the intermediate shaft assembly into the trans-
mission case. Position the thrust washer so the beveled
comer is toward the input shaft. Install a new O-ring on
the intermediate shaft. Use a soft-faced hammer to tap the
shaft into the case.
5. While holding the input shaft out of the way, insert the
output shaft assembly into the transmission case. Move
the gears into mesh on the intermediate shaft, input shaft
and output shaft while installing the output shaft.
6. If the following components have been replaced, refer
to the Bearing Adjustment section: input shaft, input shaft
bearings, output shaft, drive plate, spacer, thrust washers
and output shaft bearings. After adjusting the bearings,
continue to reassemble the transmission as described in
the following steps. If the preceding components have not
been replaced, bearing adjustment is not necessary and
the orginal shims may be reused. Proceed to the following
step.
7. Install the input shaft oil seal.
8. Coat the case mating surface with RTV sealer.
9. Install the mounting flange and tighten bolts evenly.
10. Place the shift ring in neutral position and install the
shift fork through the side opening.
11. Insert the shift bar through the hole in the rear of the
case while installing the shift fork onto the shift bar.
12. Install the shift bar plug. Make sure the threaded end
of the shift bar is installed toward the rear of the case.
13. Install the shifter assembly. Align the marks made
during disassembly and tighten the retaining bolts se-
curely. Loosen the shift lever clamp bolt and position the
CHAPTER ELEVEN
lever so it points up at a 45° angle toward the rear of the
transmission. Retighten the clamp bolt.
14. Check the operation of the transmission. A click
should be audible when the gears are properly engaged. If
the gears do not engage, loosen the shifter retaining bolts
and reposition the shifter. If improper engagement contin-
ues, remove the shifter and check for improper assembly
of the shifting components.
15. Install the O-ring on the output shaft.
16. If not previously installed, install the oil seal into the
case.
17. Install the coupling flange onto the output shaft.
Tighten the retaining nut to the torque specified in Table
2.
18. Install the drain plug and oil dipstick.
19. Fill the transmission with the recommended trans-
mission fluid. Refer to Chapter Three.
BEARING ADJUSTMENT
Perform the following procedure if the following com-
ponents have been replaced: input shaft, input shaft bear-
ings, output shaft, drive plate, spacer, thrust washers and
output shaft bearings. This procedure determines the
thickness of shims that must be installed so the tapered
roller bearings properly contact the bearing outer races.
I. Install the input shaft, intermediate shaft and output
shafts as described in the Reassembly section.
2. Position the transmission case so the open end is up
and no pressure is being applied to the splined end of the
output shaft.
3. Install the outer bearing races on the input and output
shaft tapered bearings.