Fill vent

[Freywil]

I cannot find the fill vent on the hydro gear of my ZT HD44 zero turn

 

[gainestruk]

I just looked at exploded view and the item number list on Hydro Gear 3100 and I don't see one. ?

 

[StarTech]

The Gravely 991160 uses a hydro oil reservoir system. This serves at the vent and fill port. The normal vent location just has a plug in it the system may even the use same hole that normally have the vent attached.