I have an H with the liftall attachment for a manure bucket.
Technically, the "LiftAll" is the pump unit, often commonly called the "belly pump". Your LiftAll powers your #30 loader.
The cylinder seals are not completely water tight and I'm thinking rain water will run along the cylinders and seep into the system.
Not really likely you're getting any significant water that way. In my experience, any tractor that sits outside in anything other than a desert climate, accumulates water from condensation over time just from the heating and cooling of housings and the drawing in of air containing water vapor. The more 24 hour temperature stability you can give any piece of equipment (not just under a roof, but inside 4 walls), the less moisture / condensation damage it will suffer.
The loader having "one way" cylinders to work with the LiftAll internal "one way" valve, every time you extend the cylinders, you're bringing in 5 quarts of air which contains water vapor. Leave the cylinders extended overnight, and most of the water in that air condenses in a cooling pump case. Because water is heavier than oil, it sinks to the bottom and the only way out is the drain plug.
If left outside, an amazing amount of rain can get into transmissions from the shifter stem alone.
Also, the liftall is held together with a series of pins that are 3/4" but have carriage bolt heads on one side. Anyone know where to get 3/4" carriage pins without threads? Thanks.
Happy Harry
Harry, don't use bolts. If there are threads anywhere inside a pivot point, it will wear the pivot bushings a lot faster than a pin would. Places like Tractor Supply have 3/4" pins (cat1 toplink pins, draw pins, etc) available in several lengths. Or you could go to CaseIH and very likely still be able to get the OEM pins, and bushings if needed. Or you could have a local machine shop make slightly oversize pins to more accurately fit the wear the loader pivots have seen over the past 60 or so years, or even make replacement bushings.
I've found that short of having a shop full of machine tools and the skills to use them, having a friend (or two or several) in local machine shop(s), is an absolute necessity when dealing with equipment that's seen 40 or more years of use. Not only have I made parts (or hired more complicated items), but occasionally made parts better and cheaper than I could have bought them through a dealer.
Enjoy your H. I'm certainly liking mine.