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  1. #21
    Super Star Member
    Join Date
    Mar 2008
    Posts
    10,592
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Bringing an old generator back to life

    Quote Originally Posted by Bob Rooks View Post
    What are you getting for exitation voltage? Sounds like you have an open circuit somewhere.
    Or he let it idle and fried the voltage regulator.
    The MEP002 and MEP003 generators should NEVER, EVER, EVER, EVER be idled
    At idle, the voltage regular WILL fry itself VERY QUICKLY trying to get the genset to make 120VAC when it is only spinning fast enough to make 60VAC

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  2. #22
    Veteran Member Bob Rooks's Avatar
    Join Date
    Feb 2007
    Posts
    2,278
    Location
    Bothell & Silverdale, WA
    Tractor
    Yuchai Bulldozer

    Default Re: Bringing an old generator back to life

    How can you get them to idle? My DJB and DJC wind right up to 1,800 (60Hz) r/m?
    Yuchai 306R dozer, Mustang 2040 skid steer, Mitsubishi MS035 Mini-Ex with four buckets and a rake, Trimble equipped 7' Dual Dozer with twin GCR-2 laser receivers, and a LiTW BH7600 back hoe (sold).

  3. #23
    Super Star Member
    Join Date
    Mar 2008
    Posts
    10,592
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Bringing an old generator back to life

    Quote Originally Posted by Bob Rooks View Post
    How can you get them to idle? My DJB and DJC wind right up to 1,800 (60Hz) r/m?
    There is a throttle control on the MEP gensets with a locking mechanism that you use to set the governor. It should be set to ~62hz when unloaded and then LEFT ALONE.

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  4. #24
    New Member
    Join Date
    Dec 2012
    Posts
    17
    Location
    Sussex Co., Va.
    Tractor
    1952 JD B w/44H plow, #5 mower, 1966 JD 2510 Diesel w/JD47 loader. 1945 JD H

    Default Re: Bringing an old generator back to life

    Did you ground it? The excess current has got to go somewhere.

  5. #25
    Member
    Join Date
    Sep 2010
    Posts
    34
    Location
    Seaside, OR
    Tractor
    2006 Kubota B3030

    Default Re: Bringing an old generator back to life

    Woody, by FAR the most common no-power problem I have seen with the MEP-002a and -003a is improper starting; releasing the start switch too early prevents the generator from exciting, and it will not generate power.

    When you start the set, you need to continue to hold the start switch in the start position for 10-15 seconds AFTER the engine has started. A speed switch will disengage the starter (unless you have the throttle set to idle) and prevent it from grinding.
    Once you have the set running, you should set the throttle to 60 hz and leave it there. Running the set at low RPM will eventually burn up one of the power transistors on the voltage regulator and also result in a zero output.
    If you are already starting the set correctly, do me a favor and turn the switch to start (with the engine running) and tell me what the meters do...

  6. #26
    New Member
    Join Date
    Dec 2012
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    3
    Location
    LaRue Ohio
    Tractor
    Huber

    Default Re: Bringing an old generator back to life

    sewerzuk.....wow...that worked every time.....thank you......now a new problem....in the convience outlet I plugged in a small hair dryer....and the governor took 30 sec to recover and when the dryer was shut off the engine rpm's went wat up and the engine slowly settled back 60 hertz,,,,the voltage was easy to regulate....as was the hertz untill a load was applied.....thank you again for your help........

  7. #27
    Member
    Join Date
    Sep 2010
    Posts
    34
    Location
    Seaside, OR
    Tractor
    2006 Kubota B3030

    Default Re: Bringing an old generator back to life

    It should take nowhere near that long to recover...since it stayed low and then stayed high, I suspect sticky linkage. Try cleaning/lube on all of the linkage on the injection pump. Make sure to get some good lubricant inside all of the pivot points. Your generator should have had no problem with a small hair dryer; I believe they are designed for a 2hz droop from zero to full load.
    After the linkage is repaired, try loading it with something larger...let me know what kind of frequency droop you see...

  8. #28
    New Member
    Join Date
    Dec 2012
    Posts
    3
    Location
    LaRue Ohio
    Tractor
    Huber

    Default Re: Bringing an old generator back to life

    sewerzuk....finally got back to the 003 and found the governor linkage was binding on the side of the fuel shut off solenoid.....I bent it away just enough to clear.....starts easier and responds much quicker....my next task is to find something to load it down in order to check it under something near a full load.....any thoughts of what might work? I thought maybe hook it to the house and hit it with the water heater....I am open to any and all ideas....thank you again for all your help....woody

  9. #29
    Member
    Join Date
    Sep 2010
    Posts
    34
    Location
    Seaside, OR
    Tractor
    2006 Kubota B3030

    Default Re: Bringing an old generator back to life

    Quote Originally Posted by woody2956 View Post
    sewerzuk....finally got back to the 003 and found the governor linkage was binding on the side of the fuel shut off solenoid.....I bent it away just enough to clear.....starts easier and responds much quicker....my next task is to find something to load it down in order to check it under something near a full load.....any thoughts of what might work? I thought maybe hook it to the house and hit it with the water heater....I am open to any and all ideas....thank you again for all your help....woody
    Glad to hear you sorted out the linkage issue...
    Before I had my load bank, I loaded my sets with all sorts of stuff. Hot water heaters, clothes dryers, ovens, ranges, and other household appliances work well, but they do cycle on and off. That's fine for a short load test, but if your goal is something extended then it is best to find more constant loads. Halogen lights and space heaters are good because they are always on. If the set is powering your house, you can usually put a pretty good load on it by turning on all of the lights in the house, the TV(s), etc.

  10. #30
    Veteran Member Bob Rooks's Avatar
    Join Date
    Feb 2007
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    2,278
    Location
    Bothell & Silverdale, WA
    Tractor
    Yuchai Bulldozer

    Default Re: Bringing an old generator back to life

    Side question:
    I just acquired a DJB two cylinder and it needs a CB-4 circuit breaker (it was missing).
    The parts book calls for a 320-1706-14 but I'm told the number changed to 320-1706-04, which I can't find anywhere (neither of them). This is a three lead breaker. Does anyone know of a substitute that can be used in place of the Onan part, or a good work-around?
    Yuchai 306R dozer, Mustang 2040 skid steer, Mitsubishi MS035 Mini-Ex with four buckets and a rake, Trimble equipped 7' Dual Dozer with twin GCR-2 laser receivers, and a LiTW BH7600 back hoe (sold).

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