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Lift pump Q

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Hello all I have a Q regarding a lift pump on a Robert Bosch all mechanical pump on an E7. I took lift pump off to change out a cracked elbow on inlet line and noticed that the plunger on lift pump moves in and out but has no resistance on it. Shouldn’t this plunger push back out by itself after you push it in? I just purchased a new Bosch lift pump for a Deere excavator and its very similar and it pops back out when you push the plunger in. Is there a spring in there hat could be damaged?

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isnt the pump plunger spring loaded to keep the push rod on the cam?  Now I have forgotten... Glenn would know, and a few others as well.. "V"  and "F".. 

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