Hydraulic getting air

If my 300 sits for a month or two I
have to loosen the output side of the
pump until it sprays some fluid out.
I replaced the suction side hose
thinking that was the problem but
nothing has changed. Hi-Tran fluid
level is good. Any ideas?
 
More or less there are only two possibilities, air is entering somewhere on the suction side of the pump, or the pump is worn to the point where it cannot self-prime.
 

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