Oil drive pump in the LT77

paroak said:

Hi,
does anyone know if there is a difference between the oil pump drive key between the early & later drive pump types? I know the newer ones are thicker gears but did the length of the square drive bar increase or remain the same? If the newer bar is longer, does anyone know the difference in length please?

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jamesmartin said:

the square drive increases in length for the thicker later gear

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