You'll most likely find this screw in plug on the side of the gearbox about half way up or better. Some have a square head you use a crescent wrench on and some have a plug you use a hex wrench on. Check your manual for the proper liquid to use for some of the newer units use a automatic transmission fluid instead of 90 weight gear oil. Remove the plug and put the fluid in until it starts running down your arm, it's full. Then put the plug in quickly and snug it down.
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You'll most likely find this screw in plug on the side of the gearbox about half way up or better. Some have a square head you use a crescent wrench on and some have a plug you use a hex wrench on. Check your manual for the proper liquid to use for some of the newer units use a automatic transmission fluid instead of 90 weight gear oil. Remove the plug and put the fluid in until it starts running down your arm, it's full. Then put the plug in quickly and snug it down.