804 a/b

Anyone have any experience worth 804s negative or positive
Also regarding parts availability are parts location easy for them
How about working on the vs 803


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About the only difference between the models is the engine. The B model engine was found to be a bit more robust, easyer to maintain. The 804 is just a bigger 803. I liked them

They are 3PH machines only, versus 1/3PH selectable like the 803 and smaller. Yes, you can tap two of three legs, but then you are back to the output of the 803 (and not better off for it). Do you have a need for 3PH power only?

I have both. My 804a has the Isuzu engine with mechanical fuel pump and had around 46 hours when I got it. It now has around 150 hours and recently chewed up the fan belt and the water pump has started to make noises, new bearings are in my future on that one at a minimum. I also had to replace the magnetic pickup and it would lose prime sometimes for no apparent reason. I found a manual priming pump on eBay. The 804b has the Yanmar turbo. It had around 400 hrs at purchase and I put almost 500 hours on it running a FDECU-5 heat pump last summer. I would rate the “b” slightly more robust since it will start the FDECU almost everytime while the “a” will almost always show a short when the compressor comes on due to the inrush of current. I am not sure if the short circuit protection is overly sensitive, I haven’t really looked into the problem yet. I bought mine to run 3 phase equipment but one will probably become surplus to my needs when I get my 60 kw gen going.

Robert Sears

robertsears1 said:

I have both. My 804a has the Isuzu engine with mechanical fuel pump and had around 46 hours when I got it. It now has around 150 hours and recently chewed up the fan belt and the water pump has started to make noises, new bearings are in my future on that one at a minimum. I also had to replace the magnetic pickup and it would lose prime sometimes for no apparent reason. I found a manual priming pump on eBay. The 804b has the Yanmar turbo. It had around 400 hrs and I put almost 500 hours on it running a FDECE-5 heat pump last summer. I would rate the “b” slightly more robust since it will start the FDECU almost everytime while the “a” will almost always show a short when the compressor comes on due to the inrush of current. I am not sure if the short circuit protection is overly sensitive, I haven’t really looked into the problem yet. I bought mine to run 3 phase equipment but one will probably become surplus to my needs when I get my 60 kw gen going.

Robert Sears

Click to expand...

Where they high hour units
I’m asking because I have a 803a and was considering swapping for a 804 thank you for info I’ll probably stick with mine



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Very happy with our 804a after a repower, it had a rod thru the original block. Ran our ponderosa for 6 days with nary a hiccup, fuel consumption was less than gallon/hr at 20-30% load on single ph *2 legs of 3*

https://www.steelsoldiers.com/showthread.php?167498-Wife-is-now-a-green-iron-believer&highlight=

Understood
But what’s better turbo on non turbo
What would age better
what model would have better parts availability


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the isuzu motor is in lots and lots of forklifts, my vote is the A.

Guyfang said:

About the only difference between the models is the engine. The B model engine was found to be a bit more robust, easyer to maintain. The 804 is just a bigger 803. I liked them

Click to expand...

Can you convert the 15kw to single phase?


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maniatopoulosg said:

Can you convert the 15kw to single phase?


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Click to expand...

You can not convert it to single phase with a simple rewire as you can with the MEP004.

Guyfang said:

About the only difference between the models is the engine. The B model engine was found to be a bit more robust, easyer to maintain. The 804 is just a bigger 803. I liked them

Click to expand...

Where all the a models non turbo ?


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To my knowledge, all MEP-804a generators are non turbo.

Robert

Light in the Dark said:

They are 3PH machines only, versus 1/3PH selectable like the 803 and smaller. Yes, you can tap two of three legs, but then you are back to the output of the 803 (and not better off for it). Do you have a need for 3PH power only?

Click to expand...

No I don’t
And I thought all mep generators where selectable
Thank you for the info
And a costly mistake


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