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I have an Onan QG 4000 Evap generator. This weekend, after about 16 hours, i lost power on my 110 units. It starts and runs fine. Everything works when plugged into other source. Please advise!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Onan 4000 RV Generator - where is the oil drain plug?

It should have a cover on the floor bottom that is held in place with two torx (star) screws. remove the cover and you can remove the plug with a 9/16 socket.

Posted on Dec 02, 2008

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joboo1
  • 257 Answers

SOURCE: onan microlite 4000 generator no output

Hi, The 4000 rv unit unit is equipped with full diagnostics, and is indicated by the status light blinking. The blinking sequence, blinks a code as to the fault. If your unit runs and the status light is on without blinking, it is either the circuit breaker on the genset or in your distribution panel that needs to be reset. Good Luck, this should Fixya!

Posted on Mar 02, 2009

erickg
  • 116 Answers

SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

mamicheddy
  • 79 Answers

SOURCE: Only runs if I hold the start switch

The problem is that you are not creating voltage. Remove front cover. Place a volt meter on the breaker. Start genset and you will see no voltage present. The problem could be with the brushes, rings, rotor, stator, voltage regulator, or control board.

Posted on May 09, 2009

  • 6 Answers

SOURCE: Onan MicroQuiet 4000 Generator

Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Posted on Sep 28, 2009

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1 Answer

Why does it run only in the start position?


Hello Martin, Your generator might have a low oil pressure shutdown switch. First check the oil level. If oil level is low, fill oil to proper level. If oil level is fine, I would install an auxiliary oil pressure gauge . If oil pressure is normal, I would change the oil sender unit. If oil pressure is low, I would change the oil pump.

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While you didn't indicate the btus of the HVAC I assume it worked before? What you are describing sounds like the engine isn't making horsepwer. A 2800 is a small unit that a HVAC and some lights is about all it can stand. The HVAC takes about 6 x current to start it, than it does to run it. If this inrush is high and the generator engine isn't producing full HP then it will shut off and die on under frequency. I would recommend having and engine leakdown test done (not a compression test, as that doesn't tell the whole story. This will ensure all valves and rings are mechanincally in good shape, then try a basix tune up, plugs filters etc.

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1 Answer

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You say Guardian that is Generac???? Then you indicate Onan 4.0KY. If it is a Onan and it stops after you release the button there are a couple of things. 1 st check the brushes, and polish the rotor slip rings, check the resisitance of the rotor, the electrical harness plugs are tight. The control requires a voltage feedback while cranking to engage the PCB run circuits, if all those check out you have a bad control board.

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1 Answer

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Check the slips rings and brushes, check the stator and rotor windings for continuity and for shorts to ground. Check PCB plug connections. After that you need a new control board

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1 Answer

Sensor de aceite de un onan cummins rv QG 4000 generator 4000w


If it runs while start button is pressed but stops when you let go?
Check the rotor bruhes, slip rings are clean on the rotor. If you want to get deeper check and ohm the resisitance of the rotor, and stator both for continuity and ground shorts. Check plugs and wiring on control board. Failing that replace control board

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does it have original oil in it? if so they use a lighter weight oil than recommended for engine break in. change your oil and filter and see if that doesnt solve it.could be thinning out loosing pressure when hot. i have seen this beofore.. :)

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