Toro Workman 3000 Series Service Manual page 145

Flywheel and Ring Gear Inspection
1. Check ring gear teeth for wear or damage and re­
place ring gear if necessary. If ring gear teeth are dam­
aged or broken, check starter motor pinion. To replace
ring gear, strike ring gear at several points on out circum­
ference. Install ring gear, then heat ring gear to 260 –
280�C (500 – 536�F) for shrink fit.
2. Inspect flywheel clutch disk surface for stepped wear,
streaking or seizure and replace if necessary. Check fly­
wheel runout and replace if runout exceeds the limit.
Flywheel runout limit 0.13 mm (.005 in.)
3. Check ball bearing for smooth rolling and noise.
Check (sealed) bearing for grease leakage. Replace
bearing if necessary.
Crankshaft Reassembly
1. When installing crankshaft bearings note that there is
an oil groove in the upper bearing and no oil groove in
the lower bearing.
2. Install thrust bearing so oil groove faces out.
Workman 3000/4000 Series
Ring gear
Flywheel
Ring gear
Flywheel
Upper bearing
Oil groove
Page 3 – 107
Figure 232
Ball bearing
Figure 233
Lower bearing
Not
Grooved
grooved
Figure 234
Figure 235
Liquid Cooled Gas Engine