This magnetic plug has a check valve to stop the oil from flowing out of the gear box when the magnetic plug is removed for inspection.
Remove the plug once a week to inspect the metallic deposit on the magnet and to detect wear or damage at its beginning stage to initiate preventive maintenance.
Check the oil level every time you inspect the magnetic plug. Add or change oil if necessary.
Normal Wear:
Pick up the metallic deposit off the magnet and rub it between your fingers. If it looks like silver paint it is caused by normal wear. Clean the plug. Return it to the gear box and continue to operate the gear box.
Abnormal Wear:
If the metallic deposit appears to have steel crumbs when you rub it between your fingers the gear box must be removed from service immediately and inspected for repair. When the gear teeth or bearings disintegrate into crumbs pits are formed that will not self heal. The pits will only grow like a pot hole in the road grows. The gear box must be promptly repaired.
August 1991