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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 offline
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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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Old 08-20-2015, 01:32:41 PM
alco539 alco539 is offline
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Default Re: Onan 30KW Diesel L634 governor setup

Put it under a good load and you should hear it working harder but the speed will stay very close to the same. Drop it off and the only thing that should change is it sounds like it is no longer working hard. The frequency of the engine should not really change at all. It just grunts a little harder. It sounds like you have the right pump.

Jimmy
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Old 08-20-2015, 07:44:13 PM
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Default Re: Onan 30KW Diesel L634 governor setup

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Originally Posted by 7mksuper View Post
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
Be real careful that you set the timing at STOCK specs. Those engines love to blow head gaskets.

Last edited by Motorhead; 08-20-2015 at 07:56:10 PM.
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Old 08-20-2015, 08:49:58 PM
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Default Re: Onan 30KW Diesel L634 governor setup

Except the Tech Star models. They like to blow everything.
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Old 08-20-2015, 10:16:49 PM
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Default Re: Onan 30KW Diesel L634 governor setup

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Except the Tech Star models. They like to blow everything.
I STILL can't figure out how "The TIGHTEST ship in the shipping business", UPS was sold that ONAN L634T/GMC chassis package car deal. They bought a BUNCH of them in 2.5 ton chassied package cars. They would send me to an airport 40 miles away when ours was fogged in in one of those. The pedal never came off of the floor board in 80 miles. On the straight-a-ways, it sat against the "High Idle" governor at 72mph for about 25 of the 40 one way miles. Sounded like they were running over 4,000 rpm. We were held to such a tight time constraint that the equipment had to take the beating. It did bother me because hammering equipment ain't my style.

Last edited by Motorhead; 08-21-2015 at 01:25:53 PM.
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Old 08-21-2015, 11:07:59 AM
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Default Re: Onan 30KW Diesel L634 governor setup

My guess and it is just a guess is your new injection pump is off a 3600 rpm Techstar 50.0DL6B 2 pole version and you are running it on 30.0DL6 4 pole 1800 rpm unit. This would explain the relatively throttle position, as it would be calibrated around an expected 3600 run speed, but I don't know if timing was different on the 3600 rpm model.
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Old 08-21-2015, 03:53:43 PM
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Default Re: Onan 30KW Diesel L634 governor setup

Isaac-1,
You may be correct, as there was no markings on the plate for RPM. I do not know why that was, but it is what it is. The new pump is a Onan part number, (147-0465-12) with a Mechanical advance, though I have that immobilized. I have it set at 15deg, just as the one that came off was, and it really does run great. If it comes through the load test, I have a real keeper, and only cost was a $155 pump, even if it has a low throttle position. If it fails, we may know why, but the cost to get the pump rebuilt was going to be $800+, and I did not know if that would get it running or not. if I need to, I now know it would be worth the rebuild, as everything else is good to go.

Thanks for all of the replies,
MK
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Old 08-21-2015, 05:02:07 PM
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Default Re: Onan 30KW Diesel L634 governor setup

Governor springs can be changed. Differences on pumps may be only where they de-fuel at high rpm.
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Old 08-21-2015, 05:27:15 PM
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Default Re: Onan 30KW Diesel L634 governor setup

Does the pump need to be removed from the engine to replace the spring? I may try that if the load test fails.

Thanks,
MK
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Old 08-21-2015, 06:36:03 PM
Birken Vogt Birken Vogt is offline
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Default Re: Onan 30KW Diesel L634 governor setup

http://www.biotrieb.org/fileadmin/us...nual_99009.pdf
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Old 08-21-2015, 07:45:23 PM
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Default Re: Onan 30KW Diesel L634 governor setup

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Originally Posted by 7mksuper View Post
Does the pump need to be removed from the engine to replace the spring? I may try that if the load test fails.

Thanks,
MK
Injection pumps are very intricate and even myself, with 47 years mechanical experience, would not just jump into disassembling an injection pump unless I knew EXACTLY what I was doing. They have to worked on in a very clean enviornment and if a mistake or wrong value spring is installed, the results could be dangerously catastrophic ie, run away engine, something lets go due to too high of RPM....
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