This is your chain case which converts the belt driven clutch power from the engine to a chain/gear ratio that drives the track. While I'm not familiar with this model there must be a bolt/plug about 1/3rd of the way up from the bottom of that housing that is used to check the fluid level. Remove the bolt, check and see if fluid spills out. If not, look for leaks. This fluid should be changed regularly. There is likely a drain bolt in the very bottom, found on the underside of the sled to drain said oil. Replace with any synthetic chain case oil of your choice. Good luck.
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