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Onan 30KW Diesel L634 governor setup


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  #1  
Old 08-19-2015, 12:55:04 PM
7mksuper 7mksuper is offline
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Default Onan 30KW Diesel L634 governor setup

Hello,
I have an Onan 30KW GenSet,
Motor:
MODEL # L634D-1 / 10386C

GENERATOR:
MODEL# 30.0 DL6-15R / 14297D

I Replaced the injector pump, to get it running again, as the original sat for ten years and was gummed up to the point that it would not pass any fuel. The new pump is performing very well, and it is now running great. My question is, what is the proper procedure to set the governor and or throttle position on the new pump? it seems unlikely that simply adjusting the throttle to the 1800 RPM point is appropriate, and is likely that I should be adjusting the governor screw/spring as I advance the throttle a bit to keep it at the 1800 mark.

Any Thoughts?
Thanks all,
MK

P.S. I am looking for a copy of the operation manual 934-0125 also
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Old 08-19-2015, 06:26:44 PM
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Billy J Shafer Billy J Shafer is online now
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Default Re: Onan 30KW Diesel L634 governor setup

Post an email address to get a manual.
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Old 08-19-2015, 07:30:34 PM
7mksuper 7mksuper is offline
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Default Re: Onan 30KW Diesel L634 governor setup

Sorry for the oversight, and thanks for the response.

email is mk.colorado@outlook.com
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Old 08-19-2015, 09:16:07 PM
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Default Re: Onan 30KW Diesel L634 governor setup

I have a smaller diesel set and the injection pump is set to just above 1800 rpm to get the 62 (+-) cycles unloaded. There is a set screw on one side of the control lever of the inj pump to speed it up and a set screw on the other side to lock it. Instead of looking for the 1800 rpm, set it to your HZ on the output.
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Old 08-19-2015, 09:33:38 PM
7mksuper 7mksuper is offline
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Default Re: Onan 30KW Diesel L634 governor setup

Yep, I have the same type of set up on the control lever, but to get 1800 rpm (About 61HZ), it is not "Centered" in the throw. It is in fact just off of what would be idle. I will get a load put on it this weekend, but it just seemed to me that if I put the lever more centered then adjusted to the correct HZ with the governor it would be a better way. I could be way wrong, and am hoping to be educated by someone here, as to the correct procedure.

Thanks,
MK
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Old 08-20-2015, 07:10:24 AM
Max Thompson Max Thompson is offline
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Default Re: Onan 30KW Diesel L634 governor setup

If the address works, 900-0336 DL6 service manual should be in your box in a minute.
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Old 08-20-2015, 07:52:53 AM
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Default Re: Onan 30KW Diesel L634 governor setup

The position doesn't matter. Once it is set at the proper hertz 61 to 62 no load. That is all you need to worry about. It will take care of itself. If you want 60-60 that will take an electronic governor. Which will cost some money.
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Old 08-20-2015, 08:00:53 AM
alco539 alco539 is offline
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Default Re: Onan 30KW Diesel L634 governor setup

Assuming you replaced it with the correct pump, then pretty much all you do is make sure the timing is set correctly and set the throttle to 1800 rpms. The reason I say assuming you replaced it with the correct pump is there are 2 different pumps for this engine. They will interchange just fine but will not perform the same. One of the pumps is set up with the min/max governor and the other is set up with the constant speed governor. You want the one with the constant speed governor. If you still have the old pump, compare it carefully to the new pump. Look specifically just above the high pressure output lines. On the old pump you will see a shaft sticking out maybe a couple of inches with what looks like a screw slot in the end of it. If the new one does not have that, then it is not the correct pump. If need be I can take some pictures of both to show the difference.

The bottom line is if you have the pump with the min/max governor, it will never work correctly in a generator setup. You can set it up for 1800 rpm's with no load but as soon as you drop a load on it, it will not react properly and the rpm's/frequency will drop accordingly. The more load the worse it will get. The correct pump will keep the speed relatively constant across the entire load spectrum. Don't ask me how I know this
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Old 08-20-2015, 11:41:16 AM
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Default Re: Onan 30KW Diesel L634 governor setup

Sent multiple manuals this morning.
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Old 08-20-2015, 12:00:38 PM
7mksuper 7mksuper is offline
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Default Re: Onan 30KW Diesel L634 governor setup

So it is not the exact part number, as the new one has an external timing adjustment, all the rest of it seems the same. it definitely has the governor adjustment screw ("shaft sticking out maybe a couple of inches with what looks like a screw slot in the end of it"). The engine runs fantastic now, and the generator is working as expected, but the throttle position was my concern, as the previous pump was dead in the middle of the throw, and this one is just off of idle, to get the 61 HZ. If this is normal, then all is good. I will put it under load, and go from there. I just want it to be correct.

I now have the the manuals, and I will read those and see if there is anything there, thank you to Max and Mike for the PDFs.

I will report after the load test.

Thanks all,
MK
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