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Onan 7.5JB-3CR/9804T - Welcome 'red' to the family


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  #1  
Old 02-28-2016, 05:41:21 AM
BStrutton BStrutton is offline
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Default Onan 7.5JB-3CR/9804T - Welcome 'red' to the family

Oops: http://www.ebay.com/itm/ONAN-7-5-JB-...YAAOSwMmBVySvx

With 2 6.5 NH spec K's already taking up space I didn't really need this but I couldn't pass on the doghouse and thought maybe I'd place this permanently instead of rolling out the 'portable' NH.. My blasting thumb is already starting to itch as I look at that crappy red paint on the doghouse.

Bit of a gamble for sure. We shall see. Wish me luck.

Appreciate manuals & any insight on what if anything the 9804T signifies? Serial is 0970257381. Year?

Thanks!
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Old 02-28-2016, 06:53:01 AM
Viking66 Viking66 is offline
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Default Re: 7.5JB-3CR/9804T - Welcome 'red' to the family

I looked at the Genset for a long time and almost bought it on 2 different occasions. I even talked to the guy on the phone about shipping.

I thought it was a good one and I hope for you that it turns out to be.

You should be able to find all of the manuals you need here:

http://www.twinslan.net/~n0nas/manuals/onan/

I have a Westerbeke whose Company color is red. Red is not to bad of a color, but just not on an Onan LOL
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Old 02-28-2016, 08:34:01 AM
Ray Lynch Ray Lynch is offline
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Default Re: 7.5JB-3CR/9804T - Welcome 'red' to the family

Looks like spec T with a magneciter. Built Sept 1970.
Curious to know running condition as that set has been for sale awhile.
Keep posting and good luck wiith it.
Ray
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Old 02-28-2016, 08:48:10 AM
MBB MBB is offline
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Default Re: 7.5JB-3CR/9804T - Welcome 'red' to the family

Sure the model number is correct I see nothing on it as far as a build sheet?
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Old 02-28-2016, 10:52:24 AM
Max Thompson Max Thompson is offline
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Default Re: 7.5JB-3CR/9804T - Welcome 'red' to the family

I found it in the master parts manual. Looks like it should with enclosure & fuel tank as spec.

Should also have amp. meter, low oil & over speed safety's.
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Old 02-28-2016, 10:54:39 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: 7.5JB-3CR/9804T - Welcome 'red' to the family

Quote:
Originally Posted by Max Thompson View Post
I found it in the master parts manual. Looks like it should with enclosure & fuel tank as spec.

Should also have amp. meter, low oil & over speed safety's.
I thought you were out shooting fake ducks this weekend.
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Old 02-28-2016, 07:36:28 PM
Max Thompson Max Thompson is offline
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Default Re: Onan 7.5JB-3CR/9804T - Welcome 'red' to the family

I always make time for "chores" here at The Stak. Unlike some slackers who will "nap" right through chore time.
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Old 02-28-2016, 10:03:53 PM
Leon N. Leon N. is online now
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Default Re: Onan 7.5JB-3CR/9804T - Welcome 'red' to the family

BStrutton, I have pretty much the exact same machine! The number 9804 connotates the optional equipment and the letter "T" is the factory build revision. The manuals you should have as a minimum are 967-320, the Onan Operator and Parts manual, and 967-500, the Onan JB/JC shop repair manual. These are the two manuals Onan provided to me back in 1969 when I refurbished my 705JB-3CR/4703P. They also contain parts lists, even bolt torque requirements. Those manuals cover the build spec T as well. My JB remains active on standby since 1970. This is perhaps one of the best highly reliable generator plants ever built, the likes of which will never be built again. You have a gem here! Do not attempt to start this JB without first reading the caution note printed on the inside of the control box cover or refer to the owners manual, 967-320.

Last edited by Leon N.; 02-28-2016 at 10:19:43 PM.
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Old 02-28-2016, 11:49:05 PM
BStrutton BStrutton is offline
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Default Re: Onan 7.5JB-3CR/9804T - Welcome 'red' to the family

@Leon N,

I grabbed the manual but not seeing a particular caution on startup.. Could you elaborate or point me to it in the manual so I can be thinking about it while waiting for freight?

Thanks all!
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Old 02-29-2016, 08:40:27 AM
Leon N. Leon N. is online now
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Default Re: Onan 7.5JB-3CR/9804T - Welcome 'red' to the family

Yes, I can point you to at least three areas where Onan cautions the installer/user. Looking at your picture, I would presume the magneciter output lead, T2 has already been properly grounded to prevent damage to the exciter. However, here is where you can find more information as well as from looking at the inside of the control box cover as shown below.

967-320, pages 6 & 7 show the generator output lead T2 grounded to the chassis.

Also, 967-500, page 72, look at the top wiring diagram and read the note under the diagram.
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