Onan 7kw generator problem

SGSST109E · 10-26-2022, 07:23 AM

I have a lot of work to do to make things accessable so it can be worked on. There is no way to get the cover off the generator the way its mounted in the nose of the gooseneck. I opening up the enclosure from the inside so the cover of the gneerator can be taken off. I am also going to look at raising it a few inches because the shield that covers the bottom to access the belt is inaccessable the way its mounted.

SGSST109E · 10-30-2022, 07:22 AM

Well I found out the only way to access the belt was to remove the generator from the trailer. I was able to lower the goose neck low enough to use a cherry picker to remove the generator. I have a shop crane in my garage to help me remove the engine assembly from the base. Unless you have the tools and equipment to do this job don't even try. The belt is burried behind the engine flywheel and the alternator. Its a small serpentine belt maybe 5\8" wide 4 ribs. I am freshing up all the hoses, tune up, valve adj etc. Order parts from the Onan website.

Dyno · 11-01-2022, 08:48 PM

My 7.5 Onan diesel would run 3-5 minutes then shut off. If I let it sit a while, it would restart then shut off again. I thought it was a fuel filter issue. I opened the lower access door and found the water pump belt broken. I replaced the belt and it runs fine. It is a terrible job to do. Once you get to the belt, that was easy. Getting the top and side covers off and on was the hard part. My arms look like I was playing with barb wire.

SGSST109E · 11-03-2022, 07:48 AM

My gas 7kw is air cool and you have to pull it out of the trailer to work on it. Removing the cover is extremely difficult to remove. Mine case has 4 torques screws holding it on. I am going to weld wing nuts to the top of the screws so the can be removed by hand. You can never reach the screws in the trailer cabinet with a ratchet unless you jack up the generator to get your hand in there.

voltdr · 12-01-2022, 07:55 PM

What model # is your generator?
Dan

SGSST109E · 12-02-2022, 09:12 AM

HGJAB I believe. I finished all the work, adj. valve gave it a tuneup and cleaned it up. Its back in the trailer and runs great. I welded wing nut to the ends of the torgues screws so they could be turned by hand.

cad · 12-04-2022, 03:11 PM

What ended up being the cause of the issue besides the belt? Was the rotor turning when you pushed start??

--Thanks

10-26-2022, 07:23 AM	#1
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Onan 7kw generator problem I have a lot of work to do to make things accessable so it can be worked on. There is no way to get the cover off the generator the way its mounted in the nose of the gooseneck. I opening up the enclosure from the inside so the cover of the gneerator can be taken off. I am also going to look at raising it a few inches because the shield that covers the bottom to access the belt is inaccessable the way its mounted.

10-30-2022, 07:22 AM	#2
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Onan 7kw generator problem Well I found out the only way to access the belt was to remove the generator from the trailer. I was able to lower the goose neck low enough to use a cherry picker to remove the generator. I have a shop crane in my garage to help me remove the engine assembly from the base. Unless you have the tools and equipment to do this job don't even try. The belt is burried behind the engine flywheel and the alternator. Its a small serpentine belt maybe 5\8" wide 4 ribs. I am freshing up all the hoses, tune up, valve adj etc. Order parts from the Onan website.

11-01-2022, 08:48 PM	#3
Dyno Senior Member Join Date: Dec 2002 Posts: 920 Likes: 1,148 Liked 695 Times in 206 Posts	Re: Onan 7kw generator problem My 7.5 Onan diesel would run 3-5 minutes then shut off. If I let it sit a while, it would restart then shut off again. I thought it was a fuel filter issue. I opened the lower access door and found the water pump belt broken. I replaced the belt and it runs fine. It is a terrible job to do. Once you get to the belt, that was easy. Getting the top and side covers off and on was the hard part. My arms look like I was playing with barb wire.

11-03-2022, 07:48 AM	#4
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Onan 7kw generator problem My gas 7kw is air cool and you have to pull it out of the trailer to work on it. Removing the cover is extremely difficult to remove. Mine case has 4 torques screws holding it on. I am going to weld wing nuts to the top of the screws so the can be removed by hand. You can never reach the screws in the trailer cabinet with a ratchet unless you jack up the generator to get your hand in there.

12-01-2022, 07:55 PM	#5
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 706 Likes: 77 Liked 100 Times in 51 Posts	Re: Onan 7kw generator problem What model # is your generator? Dan __________________ Dan Foley SC 4698

12-02-2022, 09:12 AM	#6
SGSST109E Member Join Date: Jun 2007 Location: NJ Posts: 351 Likes: 62 Liked 126 Times in 61 Posts	Re: Onan 7kw generator problem HGJAB I believe. I finished all the work, adj. valve gave it a tuneup and cleaned it up. Its back in the trailer and runs great. I welded wing nut to the ends of the torgues screws so they could be turned by hand.

12-04-2022, 03:11 PM	#7
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 703 Likes: 203 Liked 93 Times in 52 Posts	Re: Onan 7kw generator problem What ended up being the cause of the issue besides the belt? Was the rotor turning when you pushed start?? --Thanks