ICOM, I did edit my post to concede some points. Also sawdustdad is talking about two totally different pump motor combos on the same machine. The added gear pump/motor combo was the one doing the jumping around, I believe?
We've had it where a rebuilt component didn't work on the test bench, The unit is very carefully taken apart, looking hard for clues, find nothing, reassemble and it works fine on the bench.
When this would happen and we would stand around scratching our heads, I'd tell the young guys, "Not everything can be explained, somethings you just have to accept on faith.".
And a tip for removing and installing bearings. In this Sundstrand, the case is aluminum. With a small propane torch heat the out side of the bearing bore to just hot enough you can't keep your finger on it. Aluminum expands at 1.5 X's the rate of steel, so the bearing will be loose even as it heats up. For re-installing, put the shaft and bearing assembly in the freezer for a bit. Warm the housing and drop the chilled bearing into the bore.
For putting bearings on shafts: Put the shaft in the freezer. Grab your wife's iron and set it upside down on low heat setting. A small cardboard box makes a good cradle. Set the bearing on the iron and cover with a clean cotton cloth. Using a clean thick glove slide the hot bearing over the cold shaft. Be prepared to quickly tap or press the bearing if there is still interference.
If you are afraid of your wife (and you should be) you can also set your bearing on a light bulb or heat lamp. Or buy your own iron at the thrift store.
Less friction means easier re&re of bearings and helps prevent galling and shearing from excessive force and cocking in the bore. Especially on aluminum.
|