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Old 08-01-2012, 10:47 PM   #11
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I've included a couple pictures below to show how the Onan works. Since it's much easier to see with pictures than with words.
Thanks for your post showing the Onan Gen. I knew they had twin shafts with a speed reduction, good idea. I had no idea it was a single belt drive. I couldn't find a detailed breakdown of the unit, I was hoping for a gear reduction instead. Its impossible to work on where is and way too heavy to handle diassembly with out a machine shop of tools and engine jacks to get it out. Forget the old 10 minute belt change!
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Old 08-08-2012, 07:49 PM   #12
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Thanks for your post showing the Onan Gen. I knew they had twin shafts with a speed reduction, good idea. I had no idea it was a single belt drive. I couldn't find a detailed breakdown of the unit, I was hoping for a gear reduction instead. Its impossible to work on where is and way too heavy to handle diassembly with out a machine shop of tools and engine jacks to get it out. Forget the old 10 minute belt change!
13 and 14 mm wrenches, a $69 Harbor Fright transmission Jack, a pile of 1' long 2X and 4X4's and a friend (not necessarily strong), and you can R&R the Onan 5500 generator pretty quickly and painlessly.

I'm a fairly healthy 68-y/o, and I did it last month.

Start with whatever boards you need on the jack to touch the genny, and lower it, removing boards using a pry bar, until you get it down to where you can raise the rear of the MoHo to pull it out. I used a Harbor Fright movers' dolly as my lowest set of boards, so I could roll it off the jack. The wheels on the Jack are too small to run across uneven surfaces, so I threw the dolly in at the last minute.

The mounting frame for the genny is flexible enough to allow for a bit of slop.

Once it's out, it's easy to operate with a battery and a can of gas.

I melted the carpet on the dolly, since it exhausts straight down, but oh, well!
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Old 08-08-2012, 08:10 PM   #13
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Originally Posted by Freds342 View Post
13 and 14 mm wrenches, a $69 Harbor Fright transmission Jack, a pile of 1' long 2X and 4X4's and a friend (not necessarily strong), and you can R&R the Onan 5500 generator pretty quickly and painlessly.

I'm a fairly healthy 68-y/o, and I did it last month.

Start with whatever boards you need on the jack to touch the genny, and lower it, removing boards using a pry bar, until you get it down to where you can raise the rear of the MoHo to pull it out. I used a Harbor Fright movers' dolly as my lowest set of boards, so I could roll it off the jack. The wheels on the Jack are too small to run across uneven surfaces, so I threw the dolly in at the last minute.

The mounting frame for the genny is flexible enough to allow for a bit of slop.

Once it's out, it's easy to operate with a battery and a can of gas.

I melted the carpet on the dolly, since it exhausts straight down, but oh, well!
Cool story, how's it working out? I remember the slip ring recon, ever figure what cause the damage? Another fellow a few day ago was asking how to wire one of the 6 connector plugs, all the wires from the gen were white and the harness was colorcoded. I guess it got away when he lowered it and forgot to disconnect the harness. I hope yours is good again!
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Old 08-08-2012, 09:02 PM   #14
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Cool story, how's it working out? I remember the slip ring recon, ever figure what cause the damage? Another fellow a few day ago was asking how to wire one of the 6 connector plugs, all the wires from the gen were white and the harness was colorcoded. I guess it got away when he lowered it and forgot to disconnect the harness. I hope yours is good again!
I neglected to post that the slip rings had sustained too much damage to "buff out", and that the slip rings are no longer offered as a separate part. I had to replace the rotor, $400, as opposed to $75 for the rings. Hmmmm!

Since the gen had lots of hours on it, I did the valve adjustment and replaced the plugs.

Zoooom!

Still p/o'ed about the lack of individual parts, though. They said that the spacing was too critical to sell the parts separately. I think not! There's 1/4" or better there to mess with.

They used to sell the brushes for $7 each, but now you have to buy the whole brush block for ~$30, but that's the way lots of this stuff is going.

I used to repair microwave circuit boards and radio equipment; now it's replace the boards. Sometimes you can't even get schematics as a factory authorized operation.

I ran a Comm and Telemetry organization for a major aerospace company, and couldn't even get component-level schematics for the Motorola equipment that we used millions of dollars of equipment from!

It's all "replace the big parts" technology now!
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Old 08-08-2012, 09:41 PM   #15
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I know what ya mean, $500 for a small fix, It could have been worse I suppose, If a ring came apart, it would take the gen stator out. Then they tell you its best to buy the machine for 7500 cause the crank in bent too! Good to hear it worked out, If you still have the rotor, wonder if a machine shop can put inserts on the rings and reclaim if you need a spare, hope not.
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Old 08-09-2012, 02:17 PM   #16
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I just bought a 2-hour old 5500 that was pulled out of a toy hauler just before the manuf. went under in 2010. Got it for $1800 off Craig's List, and picked it up last week. It runs perfectly, but had a fuel leak at the carb.

I replaced the adapter on the carb (hairline crack), fogged the engine, and put her in my shop for later use. After doing this, I found out that it still has a year left on warranty!

I couldn't pass it up! Now I have one to show and one to go!
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Old 08-09-2012, 02:35 PM   #17
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When do you plan on opening Fred's Generator Shop?
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Old 08-09-2012, 05:28 PM   #18
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My situation is such that I have to have a good generator all the time. My wife suffers from a neuro-muscular disease and is temperature intolerant.

I just got back from the store, and the outside air temp in my Jeepsaid it's 107!

If the power goes down or the house air quits, we can go to the MoHo and she'll be comfortable. I keep both AC's in the MoHo set at 90, so it cools down pretty quickly when we have to use it.
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D/W Carole and Maggie the Teacup Lab (Black Chihuahua)
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