RV Quiet Diesel 7500 GenSet
Computer-Controlled Variable Speed Operation Matches Engine Speed to Load Demand, Minimizing Noise Level.
- Special Sound-Controlling Housing Encloses Cooling System and Muffler
- Three-Point, Fully Focalized Mounting System Reduces Vibration
- Self-Diagnostic Capabilities Simplify Troubleshooting
- Easy, Accessible Maintenance Points
- Runs Two BTU Air Conditioners with Power to Spare
- High Quality, Pure Sine Wave Electrical Output Helps Prevent Damage to Appliances
Model: 7.5 HDKAJ 11451
Circuit Breaker: 2 Pole 35 A
Weight: 420 lbs. / Shipping 470 lbs.
Dim: 36.35L x 24.23W x 22.28H
Auto Voltage: Yes
Engine Brand: Kubota 722
Engine Size: 719cc
Engine RPM: 3600
Cooling System: Liquid
Air Cleaner: 140-2897
Oil Filter: 122-0833
Fuel Filter: 149-2513
Spark/Glow Plug: 185-5421
Oil: SAE 15w-40w = 05-120 f
……SAE 10w-30w = 13-88 f
……SAE 5w-30w = 40-88 f
…. ** 3 qts w/Filter
Onan stats on their 7500 watt quiet diesel that indicated:
- Runtime .56 gal/hr
- .13 gal. = no load;
- .49 gal. = 1/2 load (ie; about 4000w);
- 1.0 gal. = a full load;
ie; both A/C, the microwave, the refer on A/C and most anything else you could throw in at one time.
The Diesel 7500 GenSet burns about 50% the fuel at full load as a GAS GenSet and about 20% of the fuel at no load.
In short, the Onan RV Quiet Diesel 7500 GenSet is far cheaper to operate than a gas Generator.
** All of the above is based on extensive research by SassyRV. Not guaranteed.
Rating: 64 dBA
Meter Testing (some wind noise included)
** Based on independant SassyRV research.
Learn about Noise & the Law: click here
The maintenance on this generator calls for replacing the V-belt, coolant hoses & thermostat, and cleaning the crankcase breather.
If you have the service manual and are mechanically inclined you can do your own service. Getting to the V-belt can be a problem.
To get to the v-belt the cover must be removed from that side of the gen. You’ll have to loosen the others to get the side one off. BTW….to remove and re-install the v-belt you unbolt the top pullet to separate it. There is no tension adjustment on the belt.
The V belt is at the back and requires removal of the top and rear covers to get at it. The top has to come off the remove the back, and I had to remove most of the screws on the sides to get the top off.
If you don’t have the room to remove the cover then you’ll have to pull then gen. Once you get the covers off, you’ll see how to change the belt, etc.
To lift out remove the square (about 8″) cover from the top sound shield. A lifting hook is under the square plate.
The process to remove it is fairly difficult. I don’t remember for sure, but I think it weighs over 500 lbs.
Mine is on a slide and it is still a PITA to get at it. At 1500 hours I took the top cover off and loosened the back enough to see the belt (but still couldn’t remove it.)
I could see it was still going to be a big job to get the back cover off, due to limited access. The belt still looked like new, so I opted to leave it on.
Now it’s 2 years and 400 hours later and it’s still going strong. I suppose someday I’ll wish I had changed it, but my feeling is that Onan is ultra-conservative in their change recommendation. YMMV.
Change the Coolant
Troubleshoot | No Start
Need a replacement, or service?