Disassembling Crankcase; Removing Main Ball Bearing And Oil Seal - Bosch PB-650 Service Manual

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8-10 Disassembling crankcase

8-11 Removing main ball bearing and oil seal

(B)
(A)
ENGINE
1. Remove four bolts securing the crankcase.
2. Remove woodruff key from crankshaft to avoid
damage of oil seal.
3. Hold the crankcase half and tap crankshaft end
using a plastic mallet to separate the crankcase
halves.
4. Hold the other crankcase half and tap the end of
crankshaft to remove crankshaft.
5. Clean the insides of crankcase halves if dirty .
Replace as a set if damaged.
6. Inspect the crankshaft for roughness (crankshaft
runout), discoloration, or other damage. Replace it
with a new one as required.
1. Check the ball bearings for smooth rotation.
If rough, replace it (them) with new ones.
2. Remove the main ball bearing from crankcase
half using the bearing tool set 897701-14732 as
shown.
To remove ball bearing from crankcase half
smoothly:
1) Hold nut (A) using vice firmly.
2) Tighten bolt (B) using wrench to remove the
bearing.
3. Push out oil seal using oil seal tool 897726-
21430.
NOTE : Remove the oil seal after removing main
ball bearing, because the oil seal is tight fitting.
4. Clean up inside of crankcase.
PB-650
PB-750