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Onan 4000 Generator Surging: Step-by-Step Fix Guide (2024)
Engine Medium 2-3 hours 105 👍

Onan 4000 Generator Surging: Step-by-Step Fix Guide (2024)

Despite my neighbor's Onan 4000 generator purring like a kitten, mine suddenly developed nasty surging issues yesterday — what's going wrong? It surges when cold, then settles down as it warms up. Under load it surges heavily until the appliance shuts off. Getting worse each day.

What are the main causes of generator surging? Need a step-by-step approach to diagnose and fix this - should I start with the carburetor, fuel system, or something else? …more
Onan 5500 Generator Shuts Down Under Load: Troubleshooting Guide
Engine Medium 2-3 hours 98 👍

Onan 5500 Generator Shuts Down Under Load: Troubleshooting Guide

Onan 5500 runs perfectly at idle but kills itself within 30 seconds of turning on the AC. Been fine for years and suddenly can't handle any real load. Fuel filter is new, oil is fresh, and it starts right up every time — just dies the moment I ask it to actually work. …more
How to Fix Onan Cummins HGJBB 2.8 Generator Carburetor Problems After
Engine Hard 2-4 hours 84 👍

How to Fix Onan Cummins HGJBB 2.8 Generator Carburetor Problems After

Called the landlord about the Onan Cummins HGJBB 2.8 generator in my rental RV and he just said "figure it out" when the carburetor started acting up after winter. Left our 2017 Winnebago Travato 59K with its Onan Cummins HGJBB 2.8 generator sitting for almost a year (oops), and now it's throwing a tantrum. It's running rougher than a shopping cart with a wonky wheel, and the moment I try to put any load on it - like actually using it for something useful - it just gives up and dies on me.

I removed the carburetor, and my friend helped me clean it in a sonic cleaner. Now I'm stuck because I'm not sure if the throttle and choke linkage are correctly positioned when I reinstalled it. I've confirmed fuel is getting to the carburetor, but it won't start. I took some pictures showing the wire connections and mounting, hoping someone can help me figure out the precise linkage setup.

I'm pretty sure I know what's wrong (thanks, old gas and my laziness with fuel stabilizer), but I'm wondering if anyone can confirm my suspicions about what happens to these carburetors when they sit with stale fuel. Is this the classic 'your carburetor is now a museum of varnish' situation? And if so, what's the real deal on getting it cleaned up and running again? …more
RV AGS Generator Shutdown Trips Inverter Off - Complete Fix Guide
Engine Medium 1-2 hours 79 👍

RV AGS Generator Shutdown Trips Inverter Off - Complete Fix Guide

Opened my 2006 Fleetwood Providence yesterday to find my Onan 7500 generator automatically shutting down and tripping my Xantrex Freedom 458 inverter off every time.

The AGS does its job perfectly - kicks on when needed, charges the batteries, then shuts down like a good little robot. But here's where things get spicy: about half the time when the generator shuts off, my inverter decides to throw a tantrum and shut itself off too. Then I get to do the walk of shame to hit the reset button like I'm apologizing to a moody teenager.

This has been going on for literal years, and I'm tired of playing referee between my electrical components. Anyone know what's causing this voltage drama and how I can make these two play nice together? Is it a transfer switch timing issue, some kind of sensitivity setting, or do I just have the world's most dramatic RV electrical system? …more
RV Air Bags Dropping But Tanks Hold Air: Complete Diagnosis Guide
General Medium 2-3 hours 63 👍

RV Air Bags Dropping But Tanks Hold Air: Complete Diagnosis Guide

Air bags on my coach keep deflating overnight even though the air tanks hold pressure perfectly. Compressor runs fine, tanks stay at 120 PSI, but by morning the rear is sitting on the bump stops. Something between the tanks and the bags is leaking and I can't pinpoint it. …more
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