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Thread: MEP-004A, No output

  1. #11
    4 Star General Guyfang's Avatar
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    Quote Originally Posted by robertsears1 View Post
    As Guyfang said above, have you verified that the engine is in the rpm ballpark? I am not very familiar with a 004 but I do have a 003 and 804s. On the 003 and I believe the 004, you have a throttle which is not present on the 80X series (True, except for the throttle on the 802 and 803 models). I once had the spring slip on the throttle when I mistakenly pulled it to idle (which you should never do on these generators) and it sure sounds familiar to what you are seeing. I would not trust the panel gauges until you can verify with a voltmeter. Lowes sells something called the Kill A Watt, (only problem with this or any other hertz meter is we need a AC output. It would apear that while we have one, its not constant) which plugs into the convenience outlet and I am pretty sure works if the main breaker is closed or open. You can then set your throttle to get 60 hz or also do it with a meter that has hertz setting. Are you reading volts off the output lugs, convenience outlet, or the panel gauges?
    Robert
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  2. #12
    4 Star General Guyfang's Avatar
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    Quote Originally Posted by KLChurch View Post
    This is what I've done so far testing.
    Started up the gen and held the start for 15 secs
    Volt meter showed 100volts and herts was bouncing a little. (This was on the control panel?)
    Let the start go back to the run and volts went to zero and no more herts bouncing, (the bouncing is maybe an indication of low engine speed. Using the hertz adjust know, increase the engine speed 3-4 turns. You will hear the RPM ramp up, but no hertz will read on the meter until you have VAC. Reason being, the hertz meter,which reads DC voltage, but is driven by an AC signal, is not getting that AC signal, unless you hold up S2 in the start position. This tells me:

    1. The initial excitation from S2 to the S9-C is working.
    2. It also tells me that the exciter rotor is good.
    3. Probable cause is the volt regulator card.

    No indicators lights on at this time or anytime during the test except at the first time I hit the run. Low oil pressure light lit up until the engine was running for a couple of secs.
    Then while the engine was running for a couple of mins I hit the start again and the volts showed 100 again and herts jumping the same way.
    Next I increased the voltage increase and then hit the start and while the engine running. All of this was done without shutting off the engine. Volts increased to 105 volts so I believe that the increaser, (R1 rheostat) is working.
    All this time also there was no AC ouput load on the Gen, (load terminals?).
    Next I hit the closed breaker switch. No Volts and no herts jumping. The Breaker light came on. (This proves the CB2 works and that's good.)
    During this operation I hit the start switch and got 105 volts and hertz jumping. Let off no volts and no herts and breaker light still on.
    Kris
    .

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    General KLChurch's Avatar
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    exciter6.jpgexciter7.jpg
    Opened the exciter box and found this. I think you could have roasted marshmallows on the transformer.
    Plus looking at the orange dot I think this was a swap. Very dirty inside not like the other boxes I looked inside.
    But the A11 looks good. Didn't want to see this. Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Kris
    Murphy is my friend

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    4 Star General Guyfang's Avatar
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    NSN: 5950-00-600-0840
    Part number: 72-2609
    Part number: 369B106B-01

    There are other part numbers and other info I will post as soon as I can look it up.

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    The good news is you definitely found a problem! The bad news is that it appears as if the Kraft Paper that is used to insulate and secure the transformer winding's may have deteriorated allowing the coated insulation on the transformer's windings to rub or protrude out enough to create a direct short to gnd.

    The best news is that electrically equivalent transformers usually are not that hard to find and are fairly easy to install. If you have the parts TM look it up and see what the electrical and physical spec's are as well as NSN. With some hunting you should be able to find a replacement transformer. You can always post an ad in the SS Parts wanted section for this transformer. Someone here might have a parts machine or spare sitting on a shelf that they want to get rid of.
    GEN #1 House Gen PU-751/M: 1986 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #2 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #3 Shop/Barn Gen NF-2 Enclosure: 19XX MEP-002a w/Aux Tank
    GEN #4 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 (a work in process)

    * Disclaimer - My comments on this forum are based on my opinion and my experiences only. It is your responsibility to verify any information before using or to hire a professional.

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    frank8003 (08-17-2019), Guyfang (08-14-2019), KLChurch (08-14-2019)

  8. #16
    4 Star General Guyfang's Avatar
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    05833 BARNEY MACHINERY CO 1114 PARKVIEW DR PITTSBURGH PA 15205-1425 UNITED STATES
    13483 PRECISION ELECTRONICS, INC. 1 DI TOMAS CT COPIAGUE NY 11726-1943 UNITED STATES
    19899 ELECTRIC MACHINERY DRESSER INDUSTRIES INC 800 CENTRAL AVE NE MINNEAPOLIS MN 55413-2400 UNITED STATES FORMERLY ELECTRIC MACHINERY POWERS SYSTEMS GROUP MCGRAW-EDISON CO
    22558 COAST/ADVANCED CHIP MAGNETICS, INC. DBA COAST/A C M 4225 SPENCER STREET TORRANCE CA 90503-2421 UNITED STATES
    28535 NORLAKE MANUFACTURING COMPANY DBA NORLAKE 39301 TAYLOR PKWY NORTH RIDGEVILLE OH 44039-6264 UNITED STATES
    50508 MAGNETIC COMPONENTS INC 9520 AINSLIE ST SCHILLER PARK IL 60176-1191 UNITED STATES
    53854 MAGNESPEC, INC. 1301 W MAHALO PL COMPTON CA 90220-5419 UNITED STATES
    60283 AFCON PRODUCTS, INC. 35 SARGENT DR BETHANY CT 06524-3135 UNITED STATES
    60451 CEGELEC AUTOMATION INC DIV OF GENERAL ELECTRIC CO PLC OF ENGLAND WARNER ROBINS GA 31088-7809 UNITED STATES
    64196 VOLTAMPERE CORP DEER PARK NY 11729 UNITED STATES FORMERLY LOCATED AT 19 JEFRYN BLVD W DEER PARK NY 11729-5715
    72149 ELECTRONIC TRANSFORMER CORP. DIV ELECTRONIC TRANSFORMER CORPORATION 460 TOTOWA AVE PATERSON NJ 07522-1513 UNITED STATES
    73386 FREED TRANSFORMER COMPANY 460 TOTOWA AVE PATERSON NJ 07522-1513 UNITED STATES
    80694 FOREST ELECTRIC COMPANY, THE DBA FELCO DIV A SUBSIDIARY OF KEMET ELECTRONICS CORP 1301 ARMITAGE AVE STE B MELROSE PARK IL 60160-1423 UNITED STATES
    95970 MTE CORP MILWAUKEE TRANSFORMER CO N83W13330 LEON RD MENOMONEE FALLS WI 53051-3305 UNITED STATES FORMERLY IN MILWAUKEE WI

    Suppliers addresses.

    05833 F A S3915A HQ0337 412-787-3737
    13483 A A S3309A HQ0337 6318424900 6318424904
    19899 A A S2401A HQ0339 612-378-8000 80221
    22558 A F S0513A HQ0339 3103708188 3103708388 22558
    28535 A A S3605A HQ0337 440-353-3200 440-353-3232
    50508 A A S1403A HQ0339 847-671-0633 847-671-9419
    53854 A A S0513A HQ0339 3106032262 3106032271
    60283 A A S0701A HQ0337 2033939301 2033939288
    60451 F A S1103A HQ0338
    64196 F A S3309A HQ0337
    72149 A A S3101A HQ0337 9739422222 9739429014 72149
    73386 A A S3101A HQ0337 9739422222 9739429014 72149
    80694 A A S1403A HQ0339 7086810180 7086810609
    95970 A A S1403A HQ0339 262-253-8200 262-253-8222 6Z539
    Suppliers phone numbers.

    part numbers Cage code

    169117 64196
    36B206G01 60451
    36B206G01 19899
    40-12487 50508
    40235 22558
    43673 73386
    6191 13483
    72-2609 60283
    72-2609 05833
    A1-32491 53854
    A1-32491 95970
    C10541 72149
    FEC119 80694
    PEI 6191 13483
    ST-2778 28535

    Left side part number for the transformer
    Right side, (last 5 numerals) suppliers "name", Number

    I could scream!!!!!!!!!! This darn page will not let me write or insert what I want, how I want!!!!!!!!!!!!!!
    Last edited by Guyfang; 08-14-2019 at 17:29.

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    General KLChurch's Avatar
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    Do you think we need to check something else in the exciter box while I try to find another transformer?

    Thank Yall for all your help so far, I could not have done this without you. So far if I have not had bad luck I would not have luck at all.
    Murphy is on my shoulder laughing.
    This is a real Mission. But interesting and one **** of a learning curve.
    Kris
    Last edited by KLChurch; 08-14-2019 at 17:51.
    Murphy is my friend

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    4 Star General Guyfang's Avatar
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    I dont think so. I helped someone not long ago, and he told me where he got this transformer. But all those mails went into the trash, cause I had too many. I have a list of people I have compiled. Will start sending batch mails to ask if it was them. I could scream!

    By all means put a want add in the SS forum. Maybe this guy will see it. have asked someone I know in the army. he is older then dirt. He might remember.

  12. #19
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    In this thread SS member "1800 Diesel" had a couple of MEP-004's that he said he might part out. The guy in this thread was looking for the same transformer listed under PN 72-2609.

    You might try PM'ing him and see if he has one.
    GEN #1 House Gen PU-751/M: 1986 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #2 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #3 Shop/Barn Gen NF-2 Enclosure: 19XX MEP-002a w/Aux Tank
    GEN #4 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 (a work in process)

    * Disclaimer - My comments on this forum are based on my opinion and my experiences only. It is your responsibility to verify any information before using or to hire a professional.

  13. #20
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    Found someone on Craigslist in Seattle that is parting out a MEP-004AAS. Not sure how good the parts might be but worth a shot to see if he might have an intact transformer plus any other parts you might want. Heck maybe just buy the whole Exciter Box if reasonable.

    Edit: Just noticed this is a 400 Hz machine...not sure what parts to avoid. Perhaps Guy would know what parts to steer clear of.
    Last edited by Chainbreaker; 08-14-2019 at 23:42.
    GEN #1 House Gen PU-751/M: 1986 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #2 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 w/Aux Tank & OEM cover
    GEN #3 Shop/Barn Gen NF-2 Enclosure: 19XX MEP-002a w/Aux Tank
    GEN #4 Spare Gen PU-751/M: 1991 MEP-002a/M116A2 (a work in process)

    * Disclaimer - My comments on this forum are based on my opinion and my experiences only. It is your responsibility to verify any information before using or to hire a professional.

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