Quote:
Originally Posted by greasemonkoid
Before running it was disconcerting knowing there wouldn't be pressure on the bearings, but they are ball, and should handle a bit of running without pressure lubrication.
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There is only 1 ball bearing in a Sundstrand hydro. Needle roller bearings are used in every location except on the back of the input shaft.
You didn't hurt the bearings. They could run for hours with only the oil use for assembly. All the bearings are splash lubed, or submerged. The slipper pads, swash plate, and valve block, and charge pump are what are so critical. Without oil, they won't last long.
You say that the trunk on shaft on the linkage side of the pump was leaking? It's possible, but I'm skeptical that seal was leaking. It's always the right side that the seal fails on. Between the repairs I've done, and every leaking hydro thread on this site, I'd say it's close to 99% of the time failure of the right side seal. You sure it wasn't the relief valve leaking, and running down?
You need only buy one pump. A spare is not necessary. Failure rate on a hydro almost never. Basically things can cause them to fail: towing too fast or gross lack of maintenance over the coarse of 30 years (I mean GROSS negligence). Neither of those things are even really a hydro failure as they are operator induced.