mep806a shuts off when start switch released

[dbjra]

Hi anyone
i am new to forum and hope to get help troubleshooting mep806A 60kw generator. i got unit to start and run as long as i hold the start switch on. the starter doesnt keep starting because i had to manually close the contacts on the starter solenoid. once it fires up, of course i release starter contacts. unit runs only if i hold starter switch on. once i release switch, the unit shuts down. not sure if the two issues are related. was trying to figure out if any of the faults might be causing this problem. all the components (relays, genset box are new and everything is in good shape). a few things might be in play----it has low fuel, but definitely a few gallons and i dont hear any primer pump in prime position ( the aux pump runs great). not sure if it even has electrical pump or just the mechanical when cranking.

thanks
dean

 

[Light in the Dark]

Dean,
Do you have the manuals for the set?

 

[dbjra]

Dean,
Do you have the manuals for the set?

yes, i have the manuals

 

[Ray70]

Are you kind of low on fuel in the tank, or is the machine have a"low fuel" warning on? Sounds like you have other electrical control issues going on, but low fuel warning will also shut you down ( on the smaller machines at least )

 

[dbjra]

i disconnected the low fuel 4 pin molex connector and shorted 1 to 4 and 2 to 3 and it cranked normal without having to engage the starter solenoid. low fuel warning must deactivate the starting---now that's done---does anyone know someone in the Raleigh NC area that works on these things? i told the airport here that i would take a look at it as a favor and my favor is done! I don't know enough about units to efficiently troubleshoot it. most components in unit look new or overhauled. shows low voltage
thanks
dean

 

[DieselAddict]

I'm west of Raleigh. Be happy to help if I can. You can pm me to work something out.

 

[dbjra]

I'm west of Raleigh. Be happy to help if I can. You can pm me to work something out.

thanks Chris---let me ask the airport manager first since he will be paying you and i will get back in a day or so

thanks
dean

 

[Guyfang]

Hi anyone
i am new to forum and hope to get help troubleshooting mep806A 60kw generator. i got unit to start and run as long as i hold the start switch on. the starter doesnt keep starting because i had to manually close the contacts on the starter solenoid. once it fires up, of course i release starter contacts. unit runs only if i hold starter switch on. once i release switch, the unit shuts down. not sure if the two issues are related. was trying to figure out if any of the faults might be causing this problem. all the components (relays, genset box are new and everything is in good shape). a few things might be in play----it has low fuel, but definitely a few gallons and i dont hear any primer pump in prime position ( the aux pump runs great). not sure if it even has electrical pump or just the mechanical when cranking.

thanks
dean

When you and Chris get started on the set, keep in mind that you will hear no electrical fuel pump, because there is none. Just Aux pump. If you are manually closing the contacts on the starter solenoid, that means you can not get the engine to turn over with the S1? Your description is a little unclear. If the fuel tank is empty, or you have a bad FL1 circuit, the engine will not turn over with the S1. Can you use the S10 to turn over the engine? If so, then hot wire it to run, (do the gauges, volts/freq come up?) then flip the S7 up, before letting the S1(?) go. An idiot light might come on. If so, it points to where you need to start looking.

 

[Guyfang]

Are you kind of low on fuel in the tank, or is the machine have a"low fuel" warning on? Sounds like you have other electrical control issues going on, but low fuel warning will also shut you down ( on the smaller machines at least )

Correct. Low fuel will not allow you to start the engine.

 

[dbjra]

thanks everyone---i disconnected the float switch module plug and put jumper on it and everything seemed to work as it should. i am going to take the FL1 float switch out and test it. hopefully that will be the issue. on a second note, Chris if you read this, please tell me how i can get in touch with you----my email is dbelk@precisiontek.net

 

[dbjra]

called the company that made float switch and they sent me print of probe so i could test---works fine, so i must be below level of fuel for bottom float to make contact...next question : there is a small fuel leak on drain fitting out side of tank---how in the world do you get your hand on fitting between wheel well and side of enclosure to change the rubber grommet seal? ( trailer unit )

 

[Guyfang]

called the company that made float switch and they sent me print of probe so i could test---works fine, so i must be below level of fuel for bottom float to make contact...next question : there is a small fuel leak on drain fitting out side of tank---how in the world do you get your hand on fitting between wheel well and side of enclosure to change the rubber grommet seal? ( trailer unit )

Perhaps you need top look at the TM's. There is a test procedure in the -24 TM, for the fuel level switch. If you have the switch out of the set right now, hook up the plug to it. Have someone hold the float up, and see if the set starts, (turns over) with the S1. If so, then the problem is no fuel in the set.

There are some threads here in the forum, that describe how to change the Well nuts. There is also information on a "better well nut". I would suggest removing the set from the trailer. What is the model number of the PU or PP generator/trailer setup.

 

[dbjra]

so you cant get to fuel tank drain fitting without removing set from trailer? kind of looks like it.

 

[Guyfang]

Child labor is verboten in the U.S.A. But If I knew what model power unit you had, might help.

 

[155mm]

Child labor is verboten in the U.S.A. But If I knew what model power unit you had, might help.

bahahaha, your german is sneaking out