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From the picture it looks to me like that stator has been rubbing quite a bit and I wouldn't trust it regardless if it meggers ok. It may have weakened the windings a bit. By the way, after you do install a new PMA and set the gap, one of the best ways to tell if the gen is rubbing is to hold...

set should run with no battery off of the battery charger

There were almost 30 thousand MEP831's produced by Fermont, they are now being produced by Fidelity corp. Small sets are never going to go away, they are the work horse of the military and they beat the snot out of them. You can run the 3kW without variable speed, just remember the engine has a...

Go by the TM, these engines were set up differently by Yanmar for this use.

woodward part number SA-3865

sorry, it was Ametek not Magnetek. We had issues with the Ametek contactors and had to replace them in the field with new Contact Industries. The contacts do not make when the coil is energized. The indicator light would come on and you would think the contacts were closed but there was some...

Is it a Magnetek or a Contact Industries contactor?

I don't suppose you are gonna have your fuel supply tank 6 feet in the air, so there should be no problem. The TQ fuel pumps are supposed to be able to operate properly with a 6 foot head on them. I do know that if the supply is to high and the head pressure is to high there is a chance that the...

Sorry guys, I must have a littles case of Old Timers Disease. The 24 volts for the fuel pump comes from the K1 contactor, the contactor wires #31 AND #13 (hot and ground) had been swapped at some point and caused the soldiers problem with his inoperable fuel pump. The lesson here is, you never...

I can tell you that they don't always have another one to swap out and have to fix what they have been given. I had a soldier call me once that was the fourth soldier to troubleshoot this particular set, and he said he was given 8 hours to figure it out and he never worked on generators before...

What does any of that mean? It says nothing to the reliability of the TQG's, it's a fuel blend test.

The magnet should not pop off when the start switch is in the run position. Because you have a low oil pressure fault there is no power to the actuator. What should happen is as you crank the engine by placing the start switch to the start position the oil press will start to build up and when...

MEP8XX Series 3.9 Environmental requirements. 3.9.1 Starting and operating. The set shall start and operate under each and any combination of the following operating conditions: a. All possible relative humidities, with ambient temperatures ranging from -32 to 49 °C (-25 to 120 °F) at sea level...

Thanks ted50, there is a lot of knowledge on this forum. I've been in the military generator industry for over 35 years, Guy worked on gensets in the military, Dieseladdict is an EE, just to name a few. A lot of info here, a lot of experience, a lot of guys like yourself gaining knowledge by...

K15 AC relay, supplies starter cut out and also supplies a ground through K12 to K1 so without K15 energized you cannot close K1, and your starter will re-engage when the set is running.

The red wire numbers are DC wires and the Black wire numbers are AC wires

don't go by the engine service manual for setting timing go by the tech manual for setting the timing because Yanmar changed the timing and max fuel setting for this application.

yes all the relays in the control box have LED's so you can tell when they are energized. Check all the relays and make sure the ones to the left are DC. and the one to the extreme right is an AC relay Sounds to me like you have a bad inverter and if you flip on the Battle Short switch it will...

The K8 relay is in the inverter, the relay all the way to the right in the control box is an AC relay (K15) the other 2 in the control box are DC, don't swap them, if you put one of the DC relays in the AC relay socket the relay will fry. If the set shuts down then the fault is a short circuit...

None of the AMMPS units have a PMA or Inverter The 5, 10 and 15 kW's use a Cummins generator and the 30's and 60's use a Marathon generator.