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Old 07-11-2014, 08:16 PM   #29
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The regulator has arrived! Sent with the regulator is a helpful booklet. In the booklet it says before installing, check the resistance between pins 9 and 10. It should be between 23 and 28 ohms. Well, mine is 51. Ugh! The booklet defines that problem as "A reading much higher than 28 ohms indicates a problem with the brushes, slip rings or a bad connection. The most likely cause will be dirty or oxidized slip rings so check them first and clean if necessary."

So back to studying the manual to see how to clean those slip rings. For a person of above average ability in fixing things, how hard of a job is that and how long should that take me?
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Old 07-11-2014, 10:25 PM   #30
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Should be servicable.

Take them out then look at using a pencil eraser to clean rings.

Remove plug wires and touch starter to turn shaft.

Be very carefull!!


Maybe send some photos...
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Old 07-11-2014, 10:46 PM   #31
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We had ours serviced recently due to a bad stator, the mechanic showed me how to sand the slip rings. On ours it's very easy to get to the rings, one bolt removed the assembly with the brushes. I don't remember what sandpaper he used but it was very fine.
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Old 07-11-2014, 11:11 PM   #32
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Sounds like I don't have to remove the generator from the coach eh!! Look at this picture. What do I have to move to get at the slip rings?
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Old 07-12-2014, 05:19 AM   #33
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Remove the air cleaner on the right hand side. The brush holder is on the front side of the bell end of the stator - facing you. 2 wires run to it, 2 bolts hold it in. The brushes are spring loaded in the brush holder/block.
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Old 07-12-2014, 07:18 AM   #34
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Quote:
Originally Posted by Pexring View Post
The booklet defines that problem as "A reading much higher than 28 ohms indicates a problem with the brushes, slip rings or a bad connection. The most likely cause will be dirty or oxidized slip rings so check them first and clean if necessary."
So back to studying the manual to see how to clean those slip rings. For a person of above average ability in fixing things, how hard of a job is that and how long should that take me?
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Should be servicable.
Pexring
It's not difficult.
I removed the brush holder and used a piece of 3M ScotchBright taped onto the end of a stick to clean my slip rings while cranking the engine.

However Flight Systems does sell a "slip ring cleaning tool": Slick Stick Slip Ring Cleaning Tool | Flight Systems

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Old 07-12-2014, 07:29 AM   #35
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I was looking at that slick stick. According to them all ya need to do is stick it in a cooling fin and crank away.
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Old 07-13-2014, 09:01 PM   #36
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I installed the new regulator to see if that would fix the high erratic voltage problem, and it did. But now the generator runs at top speed. I still need to clean-up those slip rings. Having those dirty wouldn't make the generator run really fast would it? Ugh!
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Old 07-14-2014, 05:19 AM   #37
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Using your meter, you set your engine rpm based upon HZ (cycles/frequency, whatever you want to refer to it as) that the unit is producing. You are looking for 61-62HZ with no load. As load increases the governor will hold the engine at that same RPM.

No, dirty slip rings will not cause the engine to run fast. Until you fix your rpm problem, such as a hung governor or carb linkage, I would unplug the voltage regulator before you cook it.
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Old 07-14-2014, 07:15 AM   #38
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I installed the new regulator to see if that would fix the high erratic voltage problem, and it did. But now the generator runs at top speed. I still need to clean-up those slip rings. Having those dirty wouldn't make the generator run really fast would it? Ugh!
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Originally Posted by 94-Newmar View Post
Using your meter, you set your engine rpm based upon HZ (cycles/frequency, whatever you want to refer to it as) that the unit is producing. You are looking for 61-62HZ with no load. As load increases the governor will hold the engine at that same RPM.

No, dirty slip rings will not cause the engine to run fast. Until you fix your rpm problem, such as a hung governor or carb linkage, I would unplug the voltage regulator before you cook it.
Pexring
I agree with 94-Newmar.
However, I am not sure that the Hz can be read when the voltage regular is unplugged.....(the tech at Flight Systems, 800-403-3728, can tell you).

A "hung", (gummed up/dirty), linkage caused my Onan to over rev and produce high Hz, (and a steady 140+ AC volts).
Cleaning and lubing the linkage with WD40 fixed that problem.
I use a Kill-A-Watt meter, (via an extension cord), to check the Hz, and/or to adjust the linkage.

BTW a Kill-A-Watt meter, (P3 - Kill A Watt ), is also good for checking the AC voltage, (generator, shore power or inverter), from any coach receptacle, (as well as directly from shore power receptacles).

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Old 07-14-2014, 06:41 PM   #39
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Oh I didn't mean to read it while the voltage regulator is unplugged.. obviously, that won't work ;-) I meant while he's attempting to find why it's running at it's max rpm to leave the voltage regulator unplugged. This series should stay running with it unplugged...
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