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Generators & Electric Motors General Discussion

Delco-Light "Little Joe" runs backwards!?


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  #1  
Old 09-11-2010, 07:19:14 PM
Warren Eastham Warren Eastham is offline
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Default Delco-Light "Little Joe" cranks backwards!?

Help!

I recently got a Delco-Light Model B-12 generator, cleaned it up some, got a manual from Delco Don, and tried to start it.

Connected a battery and pushed the start button...cranked just fine...except
BACKWARDS.

Can you guys "straighten me out"?

Thanks,

Warren

Last edited by Warren Eastham; 09-11-2010 at 08:05:28 PM. Reason: correction
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Old 09-11-2010, 09:05:51 PM
armandh armandh is offline
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Default Re: Delco-Light "Little Joe" runs back-wards!?

internally mis wired
the relation between the series field and armature needs to be flipped
get a good description of the stock wiring
to reverse a brush type motor....
either the brush leads or field wires need to be swapped
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  #3  
Old 09-12-2010, 05:08:07 PM
Warren Eastham Warren Eastham is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Checked and re-checked wiring (manually and with an ohmeter). The wiring is per manufacturer drawing. I could possibly reverse shunt field leads and series field leads but it would be difficult due to space limitation. Near impossible to reverse armature leads because the bottom one is a junction point for several wires.

I have to believe this machine cranked in the correct direction at one time!

Fields need flashing perhaps? I don't know what the procedure is for that.

Any point in trying to start it with a pull rope?

Any ideas appreciated!

Thanks,

Warren

Last edited by Warren Eastham; 09-12-2010 at 07:58:36 PM. Reason: spelling
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Old 09-12-2010, 06:05:25 PM
Tony Rye Tony Rye is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

could this be a pos. ground sys.
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Old 09-12-2010, 06:22:39 PM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Watch the valves operate as you turn it over slowly by hand. If I recall correctly, both valve springs on these units are exposed and you can see them without removing anything. The exhaust should open first, and as it is closing, the intake should open. This will show you the correct rotation of the engine. While it is generally customary for the starter rope to pull an engine over clockwise, not all are made that way. Some that I can think of that run 'backwards' when looking at the flywheel are REO, Johnson Iron Horse, and while not the flywheel end, the starter rope on most Homelite 2-stroke generators runs counter-clockwise.
Just 'cause it ain't normal, don't mean it ain't right...
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Old 09-12-2010, 06:26:35 PM
armandh armandh is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

+1 besure the way it is turning is right or wrong

but if for sure wrong...

pos/neg or AC

a brush type with series field needs the field or commutator leads reversed

that it seems right is how things likely got mis mis wired

brush asy or coils put in wrong would be my guess
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Old 09-12-2010, 08:48:57 PM
Warren Eastham Warren Eastham is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Thanks for the responses Guys,

This is quite the mystery. Neg. ground. Valves work in proper sequence if I rotate CCW by hand. Pull rope will rotate CCW. Engine cranks itself CW and air blows OUT of the mixer.

I know in my bones that the armature or both fields must be reversed to reverse the cranking direction but I've been over and over the wiring.

I think I'll put it all back together and see what happens if I try to start it with the pull rope. Whatever is wrong will most certainly be interesting. I'll keep at it!

Thanks again,

Warren
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Old 09-13-2010, 04:53:06 PM
Trevor A Cole Trevor A Cole is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Warren we all know the frustration of something going inexplicably wrong for no apparent reason. True knowledge and satisfaction comes from figuring it out yourself. The best solution is for you to discover the fault and to that end I offer some suggestions for an attack recipe!
1) Get the engine running satisfactory by starting it manually. This will prove which direction the engine is supposed to run. I assume it has an original pull rope pulley with a belt notch clearly indicating which direction you are supposed to start it? I understand you have not had the engine running ever? A previous owner could have fiddled with anything remember. A normal four stroke won't run satisfactory backwards. When and only when this has been achieved can the next step be undertaken.
2) Message us all on Smokstak! When our clapping subsides read the next step!

To be continued.....
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Old 09-13-2010, 06:36:26 PM
Warren Eastham Warren Eastham is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Thanks Trevor,

That's the plan. I just put it all back together and will try to start it via pull rope.

We'll see what happens.

If I get it started, I'll then see if it has output. I'll report along the way

Thanks,

Warren
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Old 09-16-2010, 06:56:22 PM
Warren Eastham Warren Eastham is offline
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Default Re: Delco-Light "Little Joe" runs backwards!?

Gents,

Tried starting with the pull rope (just a few drops of gas into fuel inlet) and it started up and ran fine.

Reversed shunt field wiring (only) and tried to crank electrically. Still cranks backwards but much weaker. Next I'll put the shunt field wiring back the way it was, start by pull rope, and let run for several minutes.

We'll see!

Warren
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