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 > Your search for posts made by 'bounder39zman' found 31 matches.

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RE: My generac diesel generator only runs with prime button

Hey, what can I say...I guess I am just a ""capitalist....and since my post was not addressed to you, you probably did the right thing by not reading it...probably would have bored you anyway
bounder39zman 12/04/19 08:07pm Tech Issues
RE: My generac diesel generator only runs with prime button

THE PREVIOUS POST PRETTY MUCH COVERS ALL TH POSSIBLE PROBLEMS FOR YOUR SYMPTOMS. THE PRIME BUTTON IS ACTUALLY A PRE-HEAT (GLOW PLUG) SWITCH THAT ALSO RUNS THE ELECTRIC FUEL PUMP TO PRIME THE FUEL SYSTEM. THIS SWITCH WHEN ENERGIZED BYPASSES THE CONTROL BOARD AND APPLYS POWER DIRECTLY TO FUEL PUMP AND RUN SOLENOID. WHEN CRANKING, AS GENERATOR COMES UP TO SPEED AND A.C. VOLTAGE IS PRODUCED, THE CONTROL BOARD TAKES OVER, AND SUPPLIES POWER TO FUEL PUMP AND RUN SOLENOID. THEN YOU RELEASE START SWITCH, AND IT CONTINUES TO RUN, iF THE GEN SHUTS OFF WHEN YOU RELEASE THE SWITCH, THEN YOU LIKELY HAVE A BAD CONTROL BOARD, OR NO A.C. POWER BEING PRODUCED FROM GENERATOR. lIKELY CAUSES OF NO A.C. POWER ARE FIELD BRUSH WORN OUT OR STUCK, NOT CONTACTING ROTOR SLIP RINGS, BAD VOLTAGE REGULATOR, OR (WORST CASE)OPEN OR SHORTED WINDINGS IN GEN ROTOR OR STATOR. YOU CAN"T JUST JUMPER THE GLOW/PLUG/PRIME SWITCH, FOR VERY LONG, OR YOU WILL OVERHEAT GLOW PLUGS AND DESTROY THEM. THIS IS A VERY DIFFICULT SYSTEM TO DIAGNOSE, AND AS O.P. SAID PARTS ARE GETTING TO BE SOMEWHAT OF A CHALLENGE. IF GEN END HAS GONE BAD (ROTOR OR STATOR) SET IS PROBABLY NOT COST EFFECTIVE TO REPAIR, THE CONTROL BOARDS ARE AVAILABLE, SEVERAL HUNDRED $$, AND MAY BE ALL YOU NEED.
bounder39zman 12/04/19 03:39pm Tech Issues
RE: My generac diesel generator only runs with prime button

A model # would be helpful; NP65, 75, 80D? QP75D ?
bounder39zman 12/02/19 04:11pm Tech Issues
RE: Onan Generator Fault Code 2- Low oil pressure

the oil pressure switch on that unit is a NC type switch, and it is "closed " to ground with no oil pressure. the switch "opens" on rising o.p., (about 7-9 psi) . The switch is indeed difficult to access without being able to remove top and side panels from set. these switches dont usually fail on an intermittent basis, but is possible. I have more problems with leaking than not working correctly. Not likely to be a problem with oil pump pick-up, as it happen on every start-up, and Kubota's quality control is very high. Possible that there is moisture/corrosion in wire harness connector to Inverter-controller, shorting out oil switch wire...I've run into this before. Would advise not to overfill oil level very much, as previous post said, that can cause oil to churn and foam in crankcase, tricking switch to close.
bounder39zman 11/12/19 11:37am Tech Issues
RE: Onan generator

A shop that is familiar with these generators, and is set up correctly should be able to change the oil and oil filter in about 15 min. air filter another 15 min, as the coolant overflow tank has to be removed for access to air cleaner housing. Fuel filter is a little trickier, as some fuel system bleeding/priming is required. overall should be able to do in an hour, including clean up. Oil and filter about $50, air and fuel filters about $25 each (Onan list prices)
bounder39zman 11/09/19 02:39am Tech Issues
RE: Cummins/Onan Air Filter Removal

O.P. is correct. If you move it around, there is an angle that it will clear and come out. Just gotta work with it a bit. Be careful using air nozzle to blow out filter, be gentle...too much air pressure can separate media fibers and filter will then pass more dirt than it should.
bounder39zman 10/12/19 09:19am Tech Issues
RE: run problem with Onan Marquis 5000 BGM

The early BGM's without electronic governor used a N.O. OP switch. Later versions used a N.C. OP switch. On later models, when you energize starter and oil pressure builds up, the governor controller will move throttle rod at carb. to full fuel. then will stabilize at 1800 rpm when engine starts. Make sure throttle rod has not become disengaged from actuator (other end of rod from carb). The "thunk" sound could be many things, It is common for carbon build-up on top of piston and in cyl heads to cause a knocking noise as engine turns over. only fix is to remove heads and clean carbon from heads and pistons. This is actually an ONAN recommended maintenance procedure.
bounder39zman 10/10/19 06:27pm Tech Issues
RE: Onan Genset won't stay running fixed

FlightSystems makes great products, excellent warranty and customer service. been using their voltage regulators, control boards, diagnostic equipment for years. Onan, Kohler, Generac, and others, if F.S. makes what I need, I get it from them.
bounder39zman 09/15/19 06:46pm Tech Issues
RE: Onan gas generator want start

yes...as above post states; how about a model/spec./ser no.? Back to basics; if internal combustion engine has air/fuel, compression, spark (at right time) then should run. have to determine what is missing. check fuel to carb, spark at plug, etc.
bounder39zman 09/11/19 06:33pm Tech Issues
RE: My Onan Generator is Vexing me!

you have a 2 cylinder engine....replace the other spark plug if the one you pulled looked bad.I find NGK3432 work best (BPR4EY). Onan says gap should be .025
bounder39zman 09/09/19 06:33pm Tech Issues
RE: Yet another Onan running like **** thread. HELP!

I have attempted to clean/rebuild dozens of these carbs, with mixed results. some work great...some never quite run right. But just in case you missed this, there is a soft metal seal ring INSIDE the bowl, that seals the bowl to the venturi tube. It is easily lost when disassembling bowl from carb. it will run like **** without it. It will overfuel badly. Otherwise, OP's suggestions to replace the carb probably only thing to do at this point.
bounder39zman 09/09/19 06:26pm Tech Issues
RE: Generac GP3000i/Craftsman CMXGIAC3000 Inverter Generators

through the years, Generac has manufactured most of Craftsman/Sears portable generators. Looks like those to are "cousins" for sure.
bounder39zman 09/06/19 12:46pm Tech Issues
RE: Generator not powering motorhome

above replies are all good, and should be checked out. If there is no generator receptacle, the you have an ATS (automatic transfer switch) to handle switching between the landline and generator. Typically, the generator commands the switch (will switch to generator power if available) but defaults to landline if no generator power available
bounder39zman 09/05/19 07:33pm Tech Issues
RE: Generator keeps shutting off

deal with this all the time. When gen shuts off, place couple paper towels under carb, open bowl drain screw, see if much fuel comes out. If only couple drops, or none, then either fuel pump is getting hot and quits pumping, or control board is getting overheated, and quits sending power to fuel pump. Usually displays fault code 36, but have seen other fault codes if control board is problem. There is third condition that will cause these symptoms, that being hot air is being recirculating to air intake and gen temperature in housing is getting so hot that gas is boiling in fuel line and carb, causing shut down. This problem seems to be much more common last couple years, and I can't prove it, but I think fuel boiling point is lower than used to be with the crappy fuel we have to use these days
bounder39zman 09/05/19 07:22pm Tech Issues
RE: Onan 5000 Emerald Plus?

There are numerous causes of symptoms you described. As OP's have noted, the "run " relay on control board have to latch in to power ignition and fuel pump. As you crank over with starter, the ignition and fuel pump are directly powered. The run relay on control board has to "see" 120 volts being produced to energize. So most common cause of shutting off when you release starter switch is 120volts not being produced by gen. Common causes: rotor field brushes stuck or slip rings corroded/dirty, voltage regulator failed (very common), control board not "flashing" field when cranking, or...worst case ...open or shorted winding in rotor or stator. Bad LOP switch or low oil pressure will cause this problem, but sounds like you covered that. The field brushes are located in stator housing behind air cleaner (have to remove air filter housing to access)
bounder39zman 09/01/19 02:27pm Tech Issues
RE: Onan Microquiet 4000 Won't Turn Off

What is the full model and spec number of your genny.(so I know which control board it uses) Onan starts and stops by switching grounds to control board. the center terminal or common terminal on the switches is grounded. So if unit starts ok, you know that the ground circuit is ok. If it will not shut down from either switch location, then likely problem is control board. another possibility is that the "kill" wire to ignition magneto has come loose, preventing the control board and both switches from stopping the engine
bounder39zman 08/30/19 02:29pm Tech Issues
RE: Generator Shutdown - Weid Event

I may have missed this, but do you have a gas, diesel, what KW generator? Remember that utility line (shore cable) is disconnected from coach by transfer switch when genny is running. (assuming genny c/b's are on )
bounder39zman 08/22/19 06:48am Tech Issues
RE: Onan 5500 fuel pump not priming

sounds like you need a pump. ONAN p/n A047N929. is easy to change. All posts about aging fuel lines are possible; but it acts like the pump quits pumping when it warms up....very common problem. See it frequently, fuel pumps are my most sold part. are you getting a fault code when shuts off? should be a "36" but other codes possible.
bounder39zman 08/19/19 04:49pm Tech Issues
RE: Generac Generator 75D Problems

Sounds like a cooling problem. Are you checking coolant level at rad pressure cap, rather than just visibly looking at overflow tank? The cap is under a small flap, just above control panel of gen; one screw holds it in place. Check the cooling fan blower belt, make sure lots of cooling air coming out at the bottom of set. The end panel of this set is usualiy easy to remove, take a dozen or so 1/4 bolts out.Then you can visibly check belts, etc. The oil pressure switch is readily accessible, in cyl head near front of head. The hi water temp switch not so...it is around on other side of head near thermostat. The control panel also has a overspeed shutdown function, very sensitive, can be adjusted, if you remove odd shaped plate on left side of gen, gives you access to control board and voltage regulator
bounder39zman 08/09/19 06:13pm Tech Issues
RE: Generator Oil Change Frequency

Onan dealer/cert. tech here 30 + yrs. As OP's have said, oil is cheap. 150 hours on your genny is equivalent of 6000 miles on your vehicle. And remember, this is basically a lawn mower engine. So yes, Onan says 150 hr,or annually, but personally, I do 100 hrs or less on gasoline; 150 hrs on diesels. In my part of country (Southeast), 15W-40 works great year round for both air cooled gasoline units and diesels.
bounder39zman 08/05/19 04:28pm Tech Issues
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