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Great trouble shooting that Thermistor!!!
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#2 MEP 805B oh the joys
- Thread starter 155mm
- Start date
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I am not putting any gauges on until I can at least make the fans run.
- 15,991
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Well, you are on a roll now!
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OK, so what's it do or not do, now?
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left one has the broken wire, it wouldnt do anything, no lights, no nothing.
right one, keeps throwing over/under voltage fault light. checked voltage before and after motor control box, and i have correct voltage, 120v on all 3 legs.
My opinion is, fix the broken wire and then start control exchanging parts, specifically the logic box.
I am sure i can bypass all the other switches if I can get the motors to run, oh and i have to buy all new skrews for the top cover, had to drill out almost half of them on both units.
right one, keeps throwing over/under voltage fault light. checked voltage before and after motor control box, and i have correct voltage, 120v on all 3 legs.
My opinion is, fix the broken wire and then start control exchanging parts, specifically the logic box.
I am sure i can bypass all the other switches if I can get the motors to run, oh and i have to buy all new skrews for the top cover, had to drill out almost half of them on both units.
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Sadly, the screws were always a problem on Air Con.
Your opinion, and my opinion are the same. I would fix the wire and then see if it comes up. Then do the "controlled substitution" trick.
You could jump the over/under relay. Just to see if that's the problem.
Your opinion, and my opinion are the same. I would fix the wire and then see if it comes up. Then do the "controlled substitution" trick.
You could jump the over/under relay. Just to see if that's the problem.
MSMOG
Member
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Hey 155 - I also just ordered a pressure switch from mouser for my MEP805B. I thought I was getting something with 4 or 5 wires. I ended up with a 3 wire switch. What did they send you? Factory switch appears to be 4 wire. Sorry if this was addressed later in the thread. Any suggestions on making this 3 wire work?
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Was not addressed, I ordered one from ebay, I believe it had 4 wires, i dont remember so it must not have been a big deal.
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Well, when we really needed her, she let the smoke out.
One of our neighboring towns had a direct hit from a tornado, was sending this one to keep some coolers at a cheese factory cold, did a prestart ran just fine, called the guy said come get it moved it 100yards, he gets here, I go thru the start up procedure with him and no start, hmmmm, ok, tried another start cycle and smoke rolled from the vent, so at least it happened here and not down there. Today we tear open the box, chasing smoke, the tell tell sign was no dc power light on speed control unit. this is the same genny that we had trouble before with the speed control unit. pulled box, and back plane, speed control unit. ding ding ding winner winner chicken dinner, 2 caps let the smoke out and burned a trace in the process. exactly like this other thread, so i wonder if this is the common fail point. I will attempt a repair, but will order a new one.
![IMG_0265[1].JPG](https://www.steelsoldiers.com/data/attachments/655/655132-ee2c2999b75b4d0d7f79d68e77a396b7.jpg "IMG_0265[1].JPG")
![IMG_0264[1].JPG](https://www.steelsoldiers.com/data/attachments/655/655133-b247325cc5936638ea7cb32e0d6d5308.jpg "IMG_0264[1].JPG")
One of our neighboring towns had a direct hit from a tornado, was sending this one to keep some coolers at a cheese factory cold, did a prestart ran just fine, called the guy said come get it moved it 100yards, he gets here, I go thru the start up procedure with him and no start, hmmmm, ok, tried another start cycle and smoke rolled from the vent, so at least it happened here and not down there. Today we tear open the box, chasing smoke, the tell tell sign was no dc power light on speed control unit. this is the same genny that we had trouble before with the speed control unit. pulled box, and back plane, speed control unit. ding ding ding winner winner chicken dinner, 2 caps let the smoke out and burned a trace in the process. exactly like this other thread, so i wonder if this is the common fail point. I will attempt a repair, but will order a new one.
Mep-805b No power to adc100-24 injection pump actuator. ESD5551 output power failure. Solution
Mep-805b No power to adc100-24 injection pump actuator. ESD5551 output power failure. Solution Hello all. This will probably be my only post as I am rarely on the internet. I wanted to stop by and contribute as I have gained a ton of information from this forum over the past week. I...
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@mciikurzroot
@peapvp
Hey you two. Can you two think of a reason this might happen? By that I mean have you seen this failure before?
@peapvp
Hey you two. Can you two think of a reason this might happen? By that I mean have you seen this failure before?
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It’s called old age. The components are now at their 20+ year level and are going to components heaven.
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For those of you who own and operate any of those units, the best suggestion is to maintain these marvelous units is as follows:
Store them indoors / garage the same as you would treat any classical car, don’t treat your Genset like a unwanted stepchild
Replace any at all electrolytic capacitors and check the larger wire wound resistors if they are still within +/- 1% of their name Resistance. Replace them even if their slightly above or below this tolerance and if their rated tolerance is lower like 5% as example
Being a stickler for detail will pay off big time in the long run.
Check all connectors and connections for corrosion
The longer your Genset is exposed to the elements, the more these components deteriorate. This is a exponential function rather then a linear and the reason the Military is disposing them in the first place
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Or, buy an MEP-005A!
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but its in montana and i am in oklahoma, I thought I was keeping the most reliable one here
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KISS. Thats what I like about the 005A. BUT, there is always a but, it too is showing its age. I think its easier to fix, and I think if someone comes up with some after market reverse engineering, the 005A will live lots longer then I ever will.
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I wonder if we can reverse engineer the the 805 with a locking cable, and delete the speed control board.
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Well, Mac is doing something like that. PM him.