The Onan Diesel Rv Generator and it’s specs

Onan Diesel Rv Generator will be discussed in this article. This short article focuses on the procedures necessary to service alternators in the Cummins gas Rv alternator(QD) Series, with a focus on the servicing procedures for bigger designs (10 kilowatts and 12.5 kilowatts). Even within the Cummins line of product, service intervals and treatments differ depending upon the machines size and date of manufacture; while a few of the basics may use to other gas alternator brands and designs, be sure to check the owners manual for particular instructions.

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The Cummins QD Series power cell

The power cell is housed in a sound-deadening enclosure and can be installed to a slide-rail system, which allows the machine to be extended from the front cap for easy gain access to. Depending on the year and design, a Cummins onboard machine may be equipped with either an Isuzu or a Kubota water-cooled gas engine, which are amongst the most dependable in the industry. The engine is directly paired to the alternator, unlike belt-driven units discovered in many gasoline-powered alternators.

Cummins propane range from 3.2 kilowatts to 12.5 kilowatts. A four-pole machine generally must be operated at 1,800 rpm to provide 60 hertz of power, but the smaller sizes use inverter innovation to allow variable-speed operation that raises the engine rpm as the load boosts. Larger gener– 10-kilowatt or 12.5-kilowatt– do not use inverter technology; they perform at a continuous governed 1,800 rpm despite how much load is used.

Operation Change

The Cummins 4000 alternators has an operation turn on its enclosure. A second remote switch usually is mounted inside the coach. Holding the switch in the “Run” position switches on the glow plugs to preheat the engine. The switch may have to be held a couple of seconds before the engine will crank. This is typical; the time varies depending upon how cold the ambient temperature is. As soon as the radiance plugs have warmed the engine enough, the starter engages to crank the engine. And once the engine starts, the switch can be launched. The majority of switches have a red pilot burner that lights up when the machine is running. To stop the alternator, hold the switch to the “Stop” position for a second or more.

The unit won’t start without very first priming the fuel system to bleed out the air if a alternator runs out of fuel or its fuel filter is changed. Hold the operation switch at the “Stop” position and continue holding it. In some cases, you might be able to hear the alternator’s electric fuel pump run, but, regardless, the red pilot burner will brighten. Release the operation switch after 30 seconds; the fuel system must be primed. If the machine stops working to start, duplicate this treatment. Keep in mind that this treatment can be carried out at the power cell or the remote switch in the motorhome.

Comprehensive Diagnostics

Onan 5500 generators include comprehensive diagnostics to find system faults, which are displayed and obtained from the status light on the operation switch. When the light flashes when then rests and duplicates, it indicates a shutdown due to high engine coolant temperature.

To retrieve a service fault code, you may initially have to awaken the control by pressing and holding the “Stop” switch. Then tap the “Stop” switch when. This displays a two-digit service code, which consists of 2 sets of flashes. The very first set of flashes represents the very first variety of the code; after a time out, the 2nd set of flashes indicates the code’s 2nd number. After a long time out, the sequence repeats. For instance, fault code 36 appears as blink-blink-blink– time out– blink-blink-blink-blink-blink-blink. Press the “Stop” switch to stop the flashing code. A total list of fault codes appears in the back of the operators manual or can be found online in the 7000 Recreational Vehicle power cell Handbook, To see a Cummins video that shows how to retrieve a fault code, check out

Basic Requirements

It’s extremely crucial to work out a lp genset routinely since alternators that sit unused have more problems. Cummins owner’s handbooks state that the power cell needs to be performed at least two hours monthly if use is irregular. The machine needs to be operated at approximately half the power to drive off wetness from inside the alternator and to eliminate oxide from electrical contacts and power cell slip rings. Running the system at light or no load won’t accomplish that. Working out the machine also secures your service warranty. If an issue establishes later on and the hour meter reveals that the system hasn’t been run much, guarantee coverage might be rejected.

A great prestart checklist starts with extending the power slide and removing the side gain access to cover. Check the engine oil level and look quickly for anything out of location, such as fuel or coolant leakages. (Note: On the 8-kilowatt and 6-kilowatt Rv diesel, the oil is examined utilizing the dipstick near the stop/start switch.) If you are driving and decide to utilize the coach’s air conditioning system, you won’t make these checks right then, however, don’t overlook them. Make it part of your regular to check the alternator regularly at a campground, depending on how typically it has been utilized.

Refer to the 6500 alternator’s service schedule to see what is needed, and after that acquire the appropriate filters and fluids. The alternator design number and spec modification will be needed if parts must be purchased. This detail appears on a placard installed to the alternator near its circuit breaker and a primary operation switch. The placard also suggests the oil capacity of the crankcase as well as Cummins part numbers for the most typical filters.

Common Service Interval

An Onan diesel Rv Generator needs oil and filter modifications after 50 hours to get rid of contaminants from the oil during the engine’s burglary period. Refer to the operator’s manual for the particular requirements of your alternator model.

Engine Oil And Filter

To alter the oil and oil filter, a 7/8-inch socket and ratchet, a drain pan, and an oil filter wrench are required. A set of rubber gloves and some rags or nonreusable shop towels also are available in useful. When they leave the factory, Cummins power cells are known for having exceptionally tight oil drain lugs. To loosen the drain plug the first time, utilize a large breaker bar, perhaps with a pipe for more utilize. Many owners likewise discover that the factory has installed a smaller-diameter oil filter; do not worry about the difference in size between the initial burglary filter and the replacement. However, your oil filter wrench may not fit the smaller sized filter, so a large pair of channel-lock pliers or some other tool might be needed to eliminate that filter.

To turn on the Onan lp Rv alternator Begin by heating the engine. Run it long enough to heat the oil and enable it to flow through the system. This will guarantee that any sludge is dissolved and suspended in the hot oil. Shut down the engine and turn off the breaker on the alternator. Also be sure to disengage the Automatic Alternator¬† Start module, if the motorhome is geared up with one so that it can not start the machiner during service. Once whatever is set, extend the machine and remove the service gain access to cover from the chauffeur’s side of the alternator, if you haven’t currently.

Before removing the drain plug, get rid of the oil filler cap or the dipstick to allow the crankcase to vent. Get rid of the drain plug and let the old oil flow into the drain pan.

While Oil is Draining pipes.

While the oil is draining pipes, wipe off the drain plug and inspect the gasket. This is also a good time to check the fan belt and the engine.

Inspect the operator’s handbook for the right engine oil. It must be rated for use in a diesel motor. Whether the power cell is geared up with an Isuzu or a Kubota engine, it most likely requires API class CF oil or better. It isn’t as choosy as to the emission-controlled engine in your motorhome, but for the most part, you’ll wish to utilize the same oil as in your coach to keep things standardized. You might likewise wish to consider an artificial oil for the alternator. An artificial oil’s viscosity is usually 5W-40; in contrast to 15W-40 nonsynthetic oil, synthetic oil streams better at low-temperature levels, which can be a big aid when starting the machine in winter.

The oil filter is quickly accessible on the side of the engine. Removing the filter will enable some oil to dribble down the side and potentially make a mess. Apply a light film of fresh oil to the new oil filter’s gasket before installing the filter to prevent binding as it is tightened.

Fuel Filter

At first, glimpse, altering the fuel filter looks to be an obstacle. The fuel filter, buried inside the enclosure, can be reached through the service gain access to the opening, however, it is extremely difficult to access the fuel lines that connect to the filter. The finest method is to remove the nut that holds the filter to the installing bracket.

Detach the installing bracket by removing the two bolts that hold the bracket to the sidewall; the bolts quickly can be accessed with a 10-mm wrench or socket from the beyond the alternator real estate. The bracket can then drop free of the filter. The fuel lines are flexible and long enough that the filter can then be pulled out through the gain access to opening and the lines can be removed. After the lines have been attached to the new filter, the assembly can be positioned back into the machine housing and the bracket reattached. Once the filter has been replaced, you’ll need to purge air from the fuel lines. Do this by following the priming treatment detailed earlier.

Cooling System

The Isuzu and Kubota dry-sleeve gas engines in 4kw QD alternators do not require supplemental cooling additives (SCAs) or natural acid innovation (OAT) coolants like many of the bigger wet-sleeve Cummins engines that power a motorhome. The Isuzu and Kubota engines require only a basic green durable coolant that is blended with distilled water in a 50-50 ratio to prevent damage from freezing temperatures.

When the engine cools, the coolant is drawn back into the radiator through the two-way radiator cap. Under typical power cell operation, the coolant level can be kept track of and coolant can be included without having to open the service access panel. The filler neck is then raised high so that it is above the engine; the cap can then be eliminated and new coolant added.

Changing Coolant

The coolant ought to be flushed and replaced every 1,500 hours or 5 years, whichever comes. It’s extremely unlikely that you’ll build up that many alternator rv hours, so the chances are that you’ll alter coolant after five years.

It’s not tough to do when it’s time to change coolant or you want to use various coolant. Other than some rags and a funnel, all that’s needed is a 3/8-inch hex crucial wrench. Move the filler neck out of the bracket. Then raise the filler neck as high as it will go, and get rid of the radiator cap. Place a drain pan beneath the onan genset, get rid of the 3/8-inch hex Allen plug from the bottom of the radiator, and enable the coolant to drain.

If you feel it is required to flush the system after the coolant has finished draining pipes, use a radiator flush service. When ended up, use pipeline thread sealant, such as Teflon tape, to the drain plug and re-install the plug. Tighten up the plug just enough to avoid it from working loose or dripping; overtightening might lead to damage to the soft aluminum radiator.

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Finally, to refill the gas Rv alternator system with a pre-formulated coolant or a 50-50 mix of pure coolant and pure water. To prevent mineral buildup in the cooling system, tap water is not recommended. When filling, keep the filler hose pipe high above the engine. As soon as the cooling system is full, change the radiator cap and place the filler neck assembly back into the bracket underneath the reservoir tank. Then include sufficient coolant to the reservoir tank to reach the “full-cold” level.