JD 7710 lift pump

[ARW]

Hello fellow forumers
Our JD 7710 lift pump is pumping about 70% air, we can’t bleed the system after we gave her a service
Has anyone had this before, do we just need an odd part or the full pump?
she’s done 11k so I’m not afraid to treat it to a new one

 

[marco]

Is there something stuck in the one way valves? Or o rings gone hard?

 

[ARW]

Nothing obvious, haven't had time to change the o rings yet either

 

[fiat 9090]

Nothing obvious, haven't had time to change the o rings yet either

if you put one of those rubber priming pumps on the line and give it a few pumps it should do it