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09-10-2021, 03:55 PM
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#1
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Junior Member
Join Date: Nov 2014
Location: Frederick, CO
Posts: 21
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Onan diesel 8000 HDKAK Inverter dead
Seems like I'm in a bit of a pickle, and was hoping for advice or shared experiences.
When my coach was 3yrs old, the inverter in the Onan gen died and was replaced under warranty. Now, 3 years later, it shows a code 34 (inverter overtemp) and was diagnosed by my local RV dealer (whom I have confidence in) as needing a new inverter. The part in question retails for $2400, but, according to local Cummins/Onan shop, is labeled as "obsolete, do not use" with their research department not being able to come up with an alternative.
So what's going on? Is the inverter so unreliable that they have discontinued it? I could locate one online, but am loath to spend that kind of money for something that may not last too long. What do they put in the new gens of the same model? Is this a pervasive problem with this genset?
I do have an appointment with Cummins/Onan at the end of the month, at which time I will find out options offered by their service department.
Thanks, Dan
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09-12-2021, 07:43 PM
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#2
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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I just repaired mine which is a 7.5kw quit diesel. it also has an inverter and I removed mine and sent it to Flight systems in mechanicberg pa. they fix them for 900 bucks. They also will help you over the phone to troubleshot the problem first. It will cost about 65 buck to send UPS to them. They ship it back free. One of the major problems with these inverter style generator unit is the one the magnets fly off the rotor and two the circuit on the board use CMOS chips which have tunneling problems of the internal oxide gate and fail. New designs are much better but these older units still have these inherently obsolete circuits. My generator is working well at this time. I bench test the unit for over an hour before moving back into the MH.
__________________
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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09-13-2021, 06:31 AM
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#3
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Junior Member
Join Date: Nov 2014
Location: Frederick, CO
Posts: 21
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Thanks ladagogago, I will look at this option.
Are the inverters easy to remove? i.e. they come out the bottom of the genset while it is mounted in the RV slideout tray?
Dan
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09-14-2021, 04:58 AM
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#4
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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My generator is mounted in the rear and had to be totally removed from the MH. All the cover panels must be removed to access the wiring and screws which hold the unit in place. The left side is where the inverter rest and that must be carefully lifted out of place after all the interfacing connectors are removed. The main electric feed needs to be removed to. '
On mine the screws on the electrical feed block were rusted in place and I had to destroy it to separate the harness. Most all the screws are torx so be sure to get a kit containing these sizes. The inverter weighs about fourtyeight lbs and you will need a strong cardboard box to ship.
None of the work was hard but if you don't have the tools, and or equipment to remove the generator it could be difficult. Take pictures of everything before disassembly.
Inverter exposed after moving the left side control panel.
__________________
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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09-14-2021, 08:11 AM
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#5
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,380
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Just come across this one'
https://www.colburnpower.com/cummins...-inverter.html
I have some manuals. If you need them I will try to post them here.
__________________
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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09-14-2021, 08:21 AM
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#6
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,380
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The PN in my manual is 300-6058-01 This one is an -02 so It may not work.
__________________
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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09-14-2021, 08:46 AM
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#7
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,380
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oK I went up to link provided and they allow you to use their manuals for PN lookup. The PN manual has changed from my old manual so the inverter has an updated PN 300-6058-02 is correct. They also have inverter boards that are cheaper that replacing the whole thing.
__________________
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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09-15-2021, 07:37 AM
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#8
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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A few month back I was checking with Cummins for a replacement inverter and they had on listed in buffalo ny for about the same price.. I opted to repair at flght systems for less the half the price.
__________________
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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09-22-2021, 06:53 AM
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#9
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Junior Member
Join Date: Nov 2014
Location: Frederick, CO
Posts: 21
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Thanks guys. I'm just back from travels. I may pull a few covers off the gen this week to see what all is involved in removing the inverter. (mines on a slide in the nose of the coach)
I have a service appointment at Cummins next week. I may try to get them to pull the part for me and send to Flight Systems for repair.
Dan
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09-23-2021, 12:02 PM
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#10
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Junior Member
Join Date: Nov 2014
Location: Frederick, CO
Posts: 21
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9/23 update
In about 3 hrs I was able to get the inverter out! It's off to Flight Systems today.
If all goes well, ladobago, you have saved me $2400! Thanks so much for answering my post.
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09-24-2021, 05:24 AM
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#11
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Dec 2010
Location: DW Driver - Englewood FL
Posts: 1,448
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glad I could help U, I had to do it all blind. There wasn't much info available. I was able to google all kinds of manuals and found Flight to be very good at what they do
__________________
La Dagobago
99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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05-19-2022, 11:52 AM
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#12
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Senior Member
Join Date: Aug 2021
Location: Scottsdale, Az
Posts: 185
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Mine is brand new and is out of spec after 10-15 minutes of use. Onan is stonewalling because they want all inverters for new production. Going to Cummins again today. The warranty, CONTRACT, says repair or replace and so far they won't do either. Parts might be available within 70 months I am told. They are still building and shipping new generators!
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