JD 450 Dozer

Have JD 450 dozer not sure of year, problem when you crank the dozer and put in gear it does not go in gear, there is air in the hydraulic system, once the air is bled out of system dozer will go. Every once in a while it will loose prime and you have to bleed the air out and again it will go.
Could a bad seal on the pump cause it to suck air not letting it pick up fluid?

Second big problem reverse quit working all together, all at once, could these two things be related or is the reverse is another separate issue?
 

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