Where do you put gear box oil in a fiat dt 55 66 tractor?

To add gearbox oil to a Fiat DT 55 66 tractor, locate the fill plug on the gearbox, typically found on the side or top of the housing. Remove the plug and use a funnel to pour in the appropriate type and amount of gearbox oil as specified in the tractor’s manual. Ensure the oil level is at the recommended height by checking the level through the fill hole before replacing the plug. Always consult the owner’s manual for specific oil type and capacity.