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Help with Generac Generator

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Posted by Lloyd Cimprich on April 12, 2006, 12:57 am

I am trying to get my dads Generac 4000XL working for him but would
appreciate any advice as to where to start as I am new to these things.

The two obvious problems it has are:

1. It starts fine but shuts down after about 15 seconds.

2. At idle it has power to supply a light, my dremel and even seems to want
to run my skill saw but rather than throttle up under load it simply bogs
down when a heavier load like the skill saw is added.

I have found that I can prevent it from shutting down if I disconnect the
connector leading to what appears to be an oil pressure sender. Before I did
this I checked the oil level to make sure there was plenty. Oil actually
came out the fill hole so I guess it must have been over filled.

I think my dad took it apart to try and fix it but is not sure it was
assembled properly. Also my dad thinks that he burned out his radial saw
trying to operate off the malfunctioning generator.

If anyone can suggest possible causes for my problems I would be greatly


Posted by DJ on April 12, 2006, 2:24 am

Lloyd Cimprich wrote:

So *it* thinks there's a problem, too.

So kinda like choking, then.

I assume the warranty has come and gone on that unit?

The only thing a generator could do to kill a radial saw is over-volt

Get a good RMS voltage meter that also measures hertz. Plug it in to
the generator. There are, on the ones I usually see, some adjustment
screws for both coarse and fine adjustment.
I'd bet they're out of wack... or atleast, the best place to start.

And drain the excess oil if there is any.


Posted by Bughunter on April 12, 2006, 7:14 am

I had a very similar starting problem with an XL5000 that I acquired with
the purchase of a new home. It did not seem to have many hours on it, but it
would start, idle for a few seconds than stall out.

 I removed the wire to the low oil shutdown plug in the engine block, and
now it starts.

I did a quick test with a handheld grinder, and it seemed to run that load
ok, but since then I have not used it at all.

Of course, I checked the oil level before I disconnected the sensor. I
assumed that the low oil sensor was bad. Replacements are available, but so
far I have not bothered to get one.

Don't know about your other problem.

Posted by Mawdeeb on April 12, 2006, 7:38 am

Lloyd Cimprich wrote:

This generator should have a switch on the panel called Idle control I
think. It senses if a load is present on the generator and drops the
idle when no load is present. When I had mine serviced the tech didn't
know about the switch and set the idle to low to run when auto idle was
active. Generac does carry the service manual for this machine.

Just a thought

J. Vrzal

Posted by Chris Hill on April 12, 2006, 1:47 pm

On Tue, 11 Apr 2006 20:57:45 -0400, "Lloyd Cimprich"

Replace the oil pressure sensor and check the air filter.

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