Gravelguy413 Posted March 3, 2021 Share Posted March 3, 2021 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? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66111-lift-pump-q/ Share on other sites More sharing options...
Joey Mack Posted March 3, 2021 Share Posted March 3, 2021 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".. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/66111-lift-pump-q/#findComment-469912 Share on other sites More sharing options...
fjh Posted March 3, 2021 Share Posted March 3, 2021 Yup it should have a spring loaded plunger! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66111-lift-pump-q/#findComment-469916 Share on other sites More sharing options...
Joey Mack Posted March 3, 2021 Share Posted March 3, 2021 ✌️ 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66111-lift-pump-q/#findComment-469919 Share on other sites More sharing options...
Vmac3 Posted March 5, 2021 Share Posted March 5, 2021 The spring is connected to the plunger and the cam follower/tappet. You guys are correct, there has to be spring pressure there. V Quote Link to comment https://www.bigmacktrucks.com/topic/66111-lift-pump-q/#findComment-470009 Share on other sites More sharing options...
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