philandmargo
Wichita Falls, TX
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I have an Onan GenSet 10,000 watt, Model HDCAA powered by a cummings diesel. I have a 2000 Tiffin Zephyr class A DP. GenSet is mounted in nose of the rig. GenSet has 635 total hours and is a 2000 year model. GenSet will run about 10-15 minutes then shutdown. The fault light indicates high temperature. I have checked coolent fluid level, oil, coolent recovery tank level, and made sure there is nothing obstructing the airflow. Generator has run fine for the last 200 hours. Routine maintaince has been performed per the operators manual as far as I can tell from prior owner's records. I am out of ideas. Any help would be greatly appreciated.
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catallison777
West Columbia, South Carolina
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Joined: 11/16/2010
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Same problem here except with a 7500 onan quietdiesel. I tried everything and it turned out to be a 16 dollar temp sensor. Take a look at this thread Onan Temp Sensor
2003 Damon Ultrasport 3873
Onan Quietdiesel 7500
Caterpillar 3126E
Allison Transmission 3000
Honda EU2000i
1992 Jeep Wrangler(Towed 4 Down)
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Planocat
Plano, TX
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I think if you follow the mentioned solution link to its conclusion you will find out that it turned out to be a radiator that needed to be sent to the radiator shop for cleaning. I'm in the process of experiencing the same problem with a 2004 7.5 QD that only has 205 hours on it.
While it may be the sensor on your unit, if that doesn't solve the problem you may have to pull the radiator. I pm'd the original poster and he replied that after sending out the radiator he has had no further problems.
Plancoat
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2ndhom
Eugene, Oregon
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Is there such a thing as a Genset radiator flush!!!???? Dun-no!! Maybe check with a shop that does it?
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PFGuil49
Baton Rouge, LA
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Check the belts. The 10K genset has 2 belts. Make sure the one turning the water pump isn't broken.
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PaulJ2
Northwest Oregon
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Running for 15 minutes then stopping tells me the water is circulating but not being cooled by its fan. Inop water pump would stop it in a matter of a couple minutes I think.
Or--as others say maybe the radiator tubes are partially clogged.
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barlow46
Edgewater, FL
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PFGuil49 wrote:Check the belts. The 10K genset has 2 belts. Make sure the one turning the water pump isn't broken.
Where is the 2nd belt on the 10kw. I am only seeing the water pump drive belt. Possibly an older model than I am looking at? http://www.rvtechlibrary.com/generator/Onan10KWparts.pdf
2005 Monaco Dynasty Diamond IV 42'
04 F450, 6.0 auto, 4:30 rear; BrakeSmart; 50 gal aux.tank, 01 HR Presidential 35CKS, 3 slides, axles flipped; TrailAir Pinbox. pin weight 2760. Total gross TV and 5th: 24,060 lbs.
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PFGuil49
Baton Rouge, LA
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Barlow46
Look at the Fan Mounting diagram on page 36. One belt turns the water pump system while the other belt turns the charging system (alternator if equipped). If the water pump belt breaks, it causes the generator to overheat within 10 to 15 minutes because the alternator belt starts slipping if not tight enough.
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barlow46
Edgewater, FL
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PFGull49
Here is where I got some information about only one belt. This came from a thread over on a race group. Have you heard anything about this change?
"JFYI, ran into this last month out of town.,12.5 quiet deisel. Watch for maintance on the fan and alt belt. Onan doesn't recommend messing with them until they break, because the labor is the same. Just had the fan belts break a month ago out of town. Had to overnight the parts and change at a campgound. If the coach would have been home it would have been easier to pull the complete generator.Onan does not sell the fan belt anymore, they replaced the fan drive belt with a kit for $300 . The fan itself is no longer driven by the belt off the water pump, it is retrofitted with a direct drive coupling.The water pump and alt is still driven by one belt the second belt that drives the fan is no longer needed.This Onan has a Kubato engine. To sum it up, check your belts."
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PFGuil49
Baton Rouge, LA
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Barlow46,
The information in your last post is correct. My BIL has a 2005 Imperial with a 10K Onan generator. When the water pump belt broke, the Onan service center installed the direct drive coupling kit. His generator now operates like you described above.
The OP has a 2000 Zephyr with 635 hours on his generator. Maybe he does not have the direct drive coupling kit because his belt never broke or needed replacing. But, you are correct. He needs to check his belts.
Fitz
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