MEP 804b wont crank

[Guyfang]

I installed and set the mpu, installed the Gcu.
Looking closer, the pots are set differently on the replacement panel.

(See pic- top is newly installed 804a gcu, lower is original 804b gcu)

I adjusted the newly installed replacement panel to match the original. Didnt touch the freq or overspeed pots because im not sure which way is which.

i have the gcu adjustment table for the 804a, does anyone know if its the same for the B?

anyway, from S1, it started immediately and ran with no issue.

Its the same

 

[Guyfang]

I'm having this problem and will probably venture out to remove the cover from my governor control board and check for fried components in a few minutes. The only difference is that sometimes my set will crank and either runs too fast (62hz+but has only shut down for overspeed a couple times) or slow (58hz), and the frequency knob doesn't change the engine speed when it does run. As of right now fuel pump comes on and I get a click when I turn s1 to start, fuel pump remains on as long as I hold start but shuts down when I release to run, it hasn't done more that this in the last few attempts to start.

I've done a search and I'm seeing one woodward generator control board for sale except it has the part number:

8270-1003 Rev. B

The one you guys referenced here shows 8270-1002 rev. B

Can anyone tell me if they interchange? Maybe the 1003 part number is for the mep-804B model instead of the A model? I know that's a best case scenario, but these parts are turning out to be hard to find.

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