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The gearbox on my cutter is the same as yours, I would lift the front of the cutter up until the deck is flat,
Take the top fill plug out, then remove the lower (check fluid level plug) If no oil flows out of lower plug opening, then add gear oil as other member said,
If oil flow out then let it drain down to property level,
Too much oil in a gear box can be as harmful as too little oil, if overfull, pressure builds up in the gearbox and can cause an oil seal to burst, Other issue, if gear box is low of oil or no oil in gearbox due to a faulty oil seal, you can fill gearbox to proper level with John Deere or case IH corn header grease, this material is more of a heavy thick oil than a grease, it will not run out like gearbox oil, if this works you are golden,
However if the leak is so bad that corn head grease will not stay in gearbox then you have two options,
1. Tear down gearbox and replace seals which rarely works on an old gearbox as the shafts are worn,
2. fill gearbox with regular axle grease, many old gearboxes have run for years with nothing but axle grease, The newer gearboxs top fill plug have a vented opening to relieve pressure as gears turn but will not allow rainwater to enter
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