UOC
Usable on code. Got to put on my instructors hat again.
When ordering parts, you have to keep in mind almost all equipment has several different models. So lets use the current case as a platform to explain how to ALWAYS get the right part. We know we need to get a transformer for Kris's MEP-004A. So we pull out the trusty TM 9-6115-464-24P, and thumb through it. Wallah! we find an exploded picture of the Static exciter. Figure 34, item 29, (hope the highlighter shows).
View attachment Scan_0002.pdf
Then we turn a few pages until we find the written info.
View attachment Scan_0003.pdf
We look at item 29, and see there are TWO item 29's. So what part 29 do we need? To the right we see the Column UOC. Bells and lights should be going off in your head now. "warning Will Robertson, warning". If you are not sure of just what model you have, or what you THINK you have, (like the Craigs list gen set!) then look at the NSN on the data plate. Then look at the NSN on the
TM cover. Match the NSN to the Model number, in this case MEP-004A.
View attachment Scan_0001.pdf
Then thumb through the front few pages until you see a page like this:
View attachment Scan_0004.pdf
Find the model number of your set, and the UOC is listed to the left. There is a code for the MEP-004A. Its CLD. BUT WAIT! Lower down, is a UOC for the MEP-004A again. UOC of CZL. Its for gen sets between the two Serial numbers! Yes, There were gen sets made by another manufacture. They have the serial numbers that start with KZ00001 thru Z01226. So now trudge back to look at your gen set serial number, to see if its in that range. We also know that the Utility and Precise 50/60 sets are the same except that one has a electric gov and actuator, and one doesn't. So we can use that models part also. So the MEP-00103A, UOC of CLF, is also a part we can use.
Then we go back to the page with the tech info in the parts book, and see, to the right of the top Item 29, the UOC codes CLD, CLF and CZL listed for the transformer. NSN 5950-00-600-0840, part number 72-2609 (or any of the other part numbers I listed earlier.)
This may all sound like BS, until you try buying a part for hundreds of dollars, and order the wrong one. I saw it happen hundreds of times in the army. No big deal, order another one. But for you all, its a big deal.
I once found a unit with a MEP-806A 60 KW gen set that would not produce power, (according to the unit). For two years, they tried to fix it. Replaced the main gen twice. At 12,500 bucks a crack. The original, and two new main gens. 37,500 bucks. Two years of fooling with it. Why didn't it work? The ordered a 400 hertz main gen, for a 50/60 hertz gen set. The digital controls could not read the 416 volts and 400 hertz signals. Only 120/208, 50/60 hertz. So if the controls show no output, there is no voltage. Had someone licked the output terminals, that would have quickly told them something wasn't right!
All because the mechanics did not read or see the UOC.
