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I'm not sure what you mean by 'connections are plugged' - if you mean the outlet pipes on either side have plugs to seal them off, you can test it without an implement by getting a "T" fitting (all my fittings are 1/2" but check yours to make sure) and a pressure guage for hydraulics. I bought my guage from www.surpluscenter.com for about $25 - get the 0-1500 lbs range or thereabouts. The original lift-all hydraulics on the H went to around 450-500 lbs. The later pumps went to 750-800 lbs and I've heard of folks getting 1200 lbs. Put the "T" at the end of one of the high pressure outlets - the single outlet on the right ('passenger') side would be a good choice. The lift-all system on the H takes six quarts. The pressure should come up to either 450 or 750 when you pull the operating lever all the way back. Further operations, testing, rebuilding, get a manual. To just do a quick test, you can get a black pipe "T" but if you're going to use your system, get fittings that are rated for the pressure. Sure, the Hy/Trans stuff would be fine, according to people who have a lot more than my level of experience. I was in a similar position - had an H, didn't know how good a shape the hydraulics were in. Filled up the resevoir with six quarts, came up to rated pressure and seemed to be nary a problem. Used the system to lift my snow plow for 1/2 last winter and then a dried out gasket blew and I had to rebuild the pump. I was using 30W non-det oil before it blew, which was fine because it was thicker for the old system. After I rebuilt it, I switched to the Hy/Trans and, understandably, haven't had any leaks. If you're serious about using the lift-all system, I'd just go ahead and buy the 5gal container of the Hy/Trans oil. That's the most economical and you'd have enough for a couple of flushes at least.
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