wildjoe76
Model #: (004079-4)
150 hours
Propane
Length 2 ft.
Size of gas 1/2 inch
How long since the last full maintenance: unknown
How long have you experienced this problem: unknown

Description of problem:

I just purchased this generator from a hvac facility that said it was a tradeout for a newer model. The unit had an oil leak that caused the belt to slip under load, I haven't located the leak yet. There is a sign of oil leakage, but I think the problems are a bit different than an oil leak.
Unit has oil in it.


The generator is starting for 10 seconds or so and then stopping, repeatedly. The overcrank light comes on after quite a few attempts. But it is no blinking, just on steady.


During the run time, with no load (cb1 off), I could tell there was a load (if ever so slight) on the engine that kick on and off. I took a reading on the hot site of cb1, only had about 30 volts or so at one point. . I beleive cb2 was tripping on/off to cause the engine to sound loaded, and then off. Now, cb2 is open now, probably damaged from all the tripping. I hooked a 3amp fuse where cb2 was and it blew instantly when the unit started. If I disconnect the field + from the avr, the unit starts, and the fuse glows red hot, but doesn't blow, which tells me the avr is probably shorted, the red light does turn on while the engine is running on the avr.

If I unhook the avr, and then run 12 volts into the generator field wire 4, I get over 100 volts, but I didn't hold it on long enough to get a total because I didn't know what size fuse to run it with, (5amp I read now). I tested the field windings and they are not shorted to ground.


One other thing, wire 77 was hooked up where 55 went, and 55 was hanging loose in the control panel when I found cb2 was no good.

Is there any other tests I should try before buying a vr or am I going in the wrong direction?

Thanks

Joe
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douglas123
On your 10kw unit wire #55 is not used and should be capped off. Wire #77 goes to resistor R1. Drawing C2136-E shows this. Check the back few pages of your owners manual if you still have it.
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wildjoe76
Holy cow, I must have been looking at an older wiring diagram. I'll hook it up correctly but it looks like those two wires are for the battery charging circuit anyway, which wouldn't have any affect on the cb2 or the main power windings. I haven't had a chance to test the field with 12 volts from the battery using a fuse yet, but I hope to tonight.
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wildjoe76
Holy cow, I must have been looking at an older wiring diagram. I can't find a manual for the version 4 of this series. I'll hook it up correctly but it looks like those two wires are for the battery charging circuit anyway, which wouldn't have any affect on the cb2 or the main power windings. I haven't had a chance to test the field with 12 volts from the battery using a fuse yet, but I hope to tonight.
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douglas123
Let me know if you need anymore info Can send info if you cannot download it off of generacs website.
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wildjoe76
douglas123;9423 wrote:
Let me know if you need anymore info Can send info if you cannot download it off of generacs website.


Ok, thanks for your help. I hooked the field up to 12 volts through a amp meter last night, and it pulled .6 amp. This sounds goods.

It produced 96 volts on each leg of the power windings.

I went through a couple 3 amp fuses with the voltage regulator while testing different things, but they blow instantly whether the field is hooked up or not.

The LED glows though, but this is from the power from the sensing wires going into the regulator. If I unhook them, the led goes off.

So my regulator ended with an 89 as the last two digits of the part number, will either of these regulators below work?
0F97190SRV?
79018?

BTW, the engine kept running when I had the field powered with 12 volts.
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douglas123
0F97190SRV?
79018?

The OF97190SRV is the replacement regulator for your old #89. Does your old one have the cooling fins on the back?
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wildjoe76
douglas123;9437 wrote:
0F97190SRV?
79018?


The OF97190SRV is the replacement regulator for your old #89. Does your old one have the cooling fins on the back?


Thank you so much for your help.

Nope, it is the smooth back. I can be creative where I mount it though. Does my issues sound like a VR? Do the power output voltage sound correct when the field is hooked directly to the battery?

Thanks

Joe
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douglas123
Give me a little bit of time and I can send you the proper testing procedures for your unit. Also the part number for the finned regulators cousin. Generac has had a notion to change all of ther part numbers recently. Anything above 60vac is usually a good sign. Been super busy which is good but I like helping folks in my spare time just as much.
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wildjoe76
Douglas, thanks for your input and help. I am axious to fix, but not in a hurry.
I noticed today my vr ended with an 88 instead of 89. Sorry about not providing the whole thing, but they "look" the same. I'll wait for ur reply for testing procedure.
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douglas123
Can you give me the serial number for your unit. I was having the same problem with the correct manual. without serial number I would be guessing at the correct manual having not seen your unit in person. I have access to all the info,but I have to look it up by serail number.
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wildjoe76
Hey douglas, Sorry to be a no show for such a long time. Here is the info you requested. Item#0040794 Serial 35173XX

If you need the complete serial, I can send it to you in a private message. Thanks
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douglas123
no problem on the no show for a while been very busy myself and tranny in service truck succommed to the heat. Drop me a pm when you get a moment.
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