Mower deck spindle greasing

I have a 2014 Broadmoor, model 2691178, 52 in deck. How can I tell when I have pumped enough grease into the blade spindle grease zerks? The usual sign of grease oozing out somewhere isn't present, at least not from the top of the deck.
 
On the underside of the deck on the side of each is a grease relief that grease will come out when the spindle is full.
 
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