engine driven hydraulic pump rebuild

[wslade2]

have 1970 E model that has the engine mounted hydraulic pump for the gear. looks like I will be needing a rebuild. wondering about experiences and suggestions. I have used Quality Aircraft Accessories for other stuff and plan to call them. Looks like Power Packs Plus does this pump too. Also, I thought somewhere I read can check the pump by seeing the doors close on runup after manually opening them. I can't seem to find that in print to confirm. By the way-have the dual pump set up (one on rear and front) which is why I would like to know about operation of each. Discovered hydraulic fluid reservoir low with no outside source of leak or drips. Service manual says this behavior can be a pump seal leaking sucking air, fluid foams and dumps overboard.

[hharney]

Pump the gear doors down with the master off and then start either engine and use the gear handle in the down position to close the doors on the ground