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The shaft is unlikely to sustain damage unless the engine has seized, placing an unusually high loading on the transmission or the machine has covered a very high mileage.

Check that each bush moves freely on the shaft but without undue free play.

Check that each pinion moves freely on the shaft or its bush where fitted but without undue free play.

Replace any damaged or worn pinions or bushes.

Check that all the oil holes and passages are clear. Make sure the oil retention dimples on fitted bushes are visible (see illustration) - if not the bush is worn. This could be caused by overheating due to inadequate lubrication.

Check for signs of scoring or bluing on the pinions, bushes where fitted, and shaft.

Replace the paired gears as a set if necessary.

Inspect the dogs and the dog holes in the gears for cracks, chips, and excessive wear especially in the form of rounded edges (see illustration).

Any pinion that is damaged as such must be replaced with a new one.

Check the gear teeth for cracking, chipping, pitting and other obvious wear or damage.

Check the needle bearing, referring to Tools and Workshop Tips in the Reference Section if required replace it with a new one.

Blow through the oil holes with compressed air if available.

Wash all of the components in clean solvent and dry them off.