pulls their weight 

Someone who does what is required of them. Usually this refers to duties in a group task or work environment. Best compared to some one who is a slacker.

John is someone who pulls their weight. He is never late, always on time. He does what ever is required of him.

pulls their weight by D2012 December 12, 2007

Pull their own weight 

It means someone who can actually do what they’re supposed to, they meet the expectations and do their job

Jimmy just got back from the army and he’s going off about how civvies can’t pull their own weight.

Pull their own weight by borntalentless May 8, 2018