Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 12-11-2011, 06:10 PM   #1
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,325
Service on Onan 7500 quiet diesel Generator

The maintenance on this generator calls for replacing the V-belt, coolant hoses & thermostat, and cleaning the crankcase breather but says these must be performed by a qualified mechanic. I don't think I need a "qualified mechanic" to change a belt, thermostat. etc. Does the generator need to be removed to access those parts? (This generator is not on a slid out tray). Any other thought or comments would be appreciated by anyone who has done this service.
Thanks
Bob
__________________

__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 12-11-2011, 06:40 PM   #2
KIX
Senior Member
 
KIX's Avatar


 
Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 3,579
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. My gen is on a slide out so it may be different than yours. 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. If you don't have the room to remove the cover then you'll have to pull then gen. To lift out remove the square (about 8") cover from the top sound shield. A lifting hook is under the square plate.
__________________

__________________
KIX
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited
KIX is offline   Reply With Quote
Old 12-11-2011, 07:57 PM   #3
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,325
Kix, Thanks for the reply. Yes, I can do the work and will probably have to pull the generator. I haven't been able to find a service manual for that engine online. I wonder if these generators are installed by Winnebago or by Freightliner? They may have some information.
Safe Travels
Bob
__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Old 12-11-2011, 08:29 PM   #4
KIX
Senior Member
 
KIX's Avatar


 
Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 3,579
You're welcome. I think the gen is installed by the coach builder vs. the chassis builder.

I found a service (shop) manual online a year or so ago. I can't remember where I got it. But, I remember just Google-ing and found it for around $10. I looked on my copy and there is no indication of where it came from. Sorry I can't help more.
__________________
KIX
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited
KIX is offline   Reply With Quote
Old 12-11-2011, 08:41 PM   #5
Senior Member
 
Martind4's Avatar
 
Join Date: Oct 2008
Location: Marshfield, WI
Posts: 433
Without having the gennie on a slideout, the process to remove it is fairly difficult. I don't remember for sure, but I think it weighs over 500 lbs. On ours, there wasn't enough clearance to just drop the gennie down, the front of the MH also had to be raised to get it out.

We ended up paying an Onan shop about $500 just to pull it and replace it. Of course some of the bolts were seized, broke and had to be drilled/tapped. With the right equipment I don't think it would be too bad a job; for a shade tree mechanic like me, I opted to hire the pros. Once you get the covers off, you'll see how to change the belt, etc.

It would have been different if it was on a slide, our next MH will have a gennie slide or we won't buy it.
__________________
Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis
Martind4 is offline   Reply With Quote
Old 12-11-2011, 09:02 PM   #6
KIX
Senior Member
 
KIX's Avatar


 
Join Date: Dec 2006
Location: St. Augustine, FL
Posts: 3,579
Seems like I heard that a friend used a forklift to remove his gen from a non-slide moho. After removal he had them out it on a trailer he was towing and took it home to service.

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.
__________________
KIX
'02 Ultimate Advantage 40J Spartan MM - Cummins ISC
2013 Jeep Rubicon JK Unlimited
KIX is offline   Reply With Quote
Old 12-12-2011, 07:57 AM   #7
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,066
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.

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.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 12-12-2011, 09:02 AM   #8
Member
 
Join Date: Nov 2011
Location: Rocklin Ca
Posts: 56
Quote:
Originally Posted by 1ciderdog View Post
The maintenance on this generator calls for replacing the V-belt, coolant hoses & thermostat, and cleaning the crankcase breather but says these must be performed by a qualified mechanic. I don't think I need a "qualified mechanic" to change a belt, thermostat. etc. Does the generator need to be removed to access those parts? (This generator is not on a slid out tray). Any other thought or comments would be appreciated by anyone who has done this service.
Thanks
Bob

How many hours is this supposed to be done?
__________________
04 Journey 39k
the4js is offline   Reply With Quote
Old 12-12-2011, 11:48 AM   #9
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,325
The4js, the operators manual calls for replacement of belt, coolant & thermostat and for cleaning the crankcase breather every 1,000 hours or at least once very five years. This generator does not have the hours but does have about seven years on it. I'm pretty sure the previous owner did not have this service performed. I think I'll wait until after the Christmas Holidays before I really dig into the generator.
Safe Travels
Bob
__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Old 12-12-2011, 12:05 PM   #10
Senior Member
 
Dave78Chief's Avatar
 
Join Date: Jun 2009
Posts: 1,513
Assuming you have the 7500 HDKAJ Quiet Diesel model:

Operators: http://www.cumminsonan.com/www/pdf/manuals/981-0161.pdf
Service: http://www.cumminsonan.com/www/pdf/m.../981-0522B.pdf
Kubota Engine: http://www.cumminsonan.com/www/pdf/manuals/981-0514.pdf

Dave
__________________
Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
Classic Winnebago Site: http://www.classicwinnebagos.com/forum/index.php
Dave78Chief is offline   Reply With Quote
Old 12-12-2011, 02:17 PM   #11
Senior Member
 
1ciderdog's Avatar


 
Join Date: Jun 2010
Posts: 4,325
Dave78Chief, Thank you. Those manuals should be a great help when I tackle this thing. I do have the first manual but a different edition. Mine has specification H and the one you provide is somewhat newer but shouldn't be much difference. A cursory review indicates the newer manual has more "safety" comments.
Again, Thank you
Safe Travels
Bob
__________________
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler
1ciderdog is offline   Reply With Quote
Old 12-12-2011, 06:13 PM   #12
Senior Member
 
Tha_Rooster's Avatar
 
Join Date: Aug 2008
Location: Georgia
Posts: 4,513
I agree the big part is dropping it mines the same way, bad design.
__________________

__________________
2007 Fleetwood Revolution LE 40V
Tha_Rooster is online now   Reply With Quote
Reply

Tags
diesel, generator, onan, service



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
onan 7500 generator WIDGET33 Winnebago Industries Owner's Forum 8 10-05-2011 07:01 PM
7500 Diesel Generator problems Bentley Monaco Owner's Forum 9 08-03-2011 12:26 PM
7.5 diesel Onan generator thermostat wagonmaster2 Winnebago Industries Owner's Forum 5 01-31-2011 11:05 PM
Onan 7.5 QD (Quiet Diesel) Generator GStream40 RV Systems & Appliances 11 06-15-2008 08:10 PM
Workhorse Builds Diesel Service Network While Expanding Service Support DriVer RV Industry Press 1 04-07-2005 04:59 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:09 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.