Honda HF2113 F Mower transaxle?

Hi I am not quite sure how the site works as it is my first time,but here goes

I have a Honda HF 2113 F mower 13 hp Honda engine (1997) the mower although old works quite well apart from the cutterdeck which is quite rusty and has been repaired a few times,but to the question in hand!,every year I change the oil in the engine at the start of the season but have never done anything to the transaxle,does anybody know if it has oil or grease in it and if so should I be changing/replacing it or adjusting anything, unfortunately i dont have a manual,please bear with me if it sounds a stupid question but i would hate for the gearbox to pack up for lack of a bit of attention,any advice would be greatfully received

best regards