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Military MEP and Aircraft Gen-Sets MEP Mobile Electric Power, APU Auxiliary Power Unit and other military surplus generators.

Military MEP and Aircraft Gen-Sets

MEP-004A voltage spike

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Old 05-01-2010, 05:43:49 PM
joshgar8 joshgar8 is offline
Join Date: May 2010
Location: Nashville, Tennessee
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Default MEP-004A voltage spike

Hey Guys,

I am new to the site and I am in search of some help. I bought me a MEP-004A 15kw 3phase JR Hollingsworth trailer mounted gen set with noise supression.

I got the gen home checked all fluids and filters. After a pre run check up to ensure the years of storage at redstone hasnt damaged anything I fired it up. I got the rpm set for 60hz and the voltage was adjusted perfect. I wanted to let everything get up to temp so I let it set there running for 30 mins or so. I then checked my gauges and the HZ was still 60hz, but the voltage had spiked about 30 volts high on all settings. I was not getting any response out of the micro adjustment with the voltage or hertz. I decided to take the two screws out of the gauge panel to take a look and see if anything abnormal........I find that the reostat for the voltage adjustment is fried, so hot that it melted the porsilen (Spelling?). I went to the local electrical supply place here in nashville and bought a exact replacement and soldered the two wires back on exactly how it was from the factory. I fired it up, and no smoke or anything burned just no response from my adjustments and still a spike in voltage on all settings.

I then get all the repair manuals and start the trouble tree. The military states if the voltage is to high to replace the VR. I took the VR out and proceed to ohm all the components in the VR to try and find the bad component as per the TM. I had no luck finding any problems.

I then decided to take the gen set to HERTZ rental here in nashville to their gen repair shop. The have had it since the second week in january and havent had any luck, however the only thing I know he has done was also check out the VR. He is very busy with rentals and no time for mine. This is what brings me here. After 5 months, I dont seem to think he will ever get it so I am going to attemp to look more into it myself.

Do any of you guys have any opinions on what to do or even a local place here around a couple hrs of nashvile to get this thing fixed?

Thanks in advance for your help guys,
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