Puch 1980-1981 Maintenance Manual page 65

DISMANTLE OIL PUMP DRIVE
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Having the engine completely dismantled, remove oil pump
drive gear from crankshaft. Using puller 905.0.34.101.0 and
cages 905.6.34.113.0.
Do not lose drive gear locating pin.
a
Remove crankshaft oil seal and drive shaft guide sleeve from
housing half.
NOTE: Always replace " 0 " rings on guide sleeve to avoid
leakage from crankcase.
a
Remove oil pump drive shaft and check for wear.
Do not lose thrust washers of lower end of drive shaft.
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