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It's a mystery to me

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s.hamer(at)verizon.net
Guest

Posted: Sat Dec 05, 2009 5:12 pm Post subject: It's a mystery to me

The flap motor on my RV-6 was occasionally not  wanting to run so I took it apart and cleaned up the excess grease per Van's  instructions.  All went well but when I put it back in the plane it was  running backwards...down was up and up was down with the flap switch.  I  didn't switch the wiring because I had a two wire plug that only goes one  way.  I changed the wires to make it work correctly.

 So, what did I do to the motor when I put it back  together to make it run in reverse?  I'm just  curious.

  

 Steve Hamer

 RV-6 flying

 Apple Valley,  Ca

    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Dec 05, 2009 7:20 pm Post subject: It's a mystery to me

At 07:05 PM 12/5/2009, you wrote:



  	  Quote: 	
		   The flap motor on my RV-6 was occasionally not wanting to run so I took it apart and cleaned up the excess grease per Van's instructions.  All went well but when I put it back in the plane it was running backwards...down was up and up was down with the flap switch.  I didn't switch the wiring because I had a two wire plug that only goes one way.  I changed the wires to make it work correctly.

 So, what did I do to the motor when I put it back together to make it run in reverse?  I'm just curious. 	


    Did you put witness marks on the end-bell that

    holds the brushes?  I believe this is a permanent

    magnet motor. Simply installing the brush holders

    180 degrees out of position has the same effect

    as flipping the two wires. Similarly, the field

    ring that mounts the magnets may have been clocked

    180 degrees out.



    How was grease getting into the motor? Normally,

    there are no lubricants in a motor that put the

    brushes/commutator at risk for contamination.

    Gooey stuff on the comm is VERY hard on surface

    life.



 

        Bob . . .    [quote][b]

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s.hamer(at)verizon.net
Guest

Posted: Sat Dec 05, 2009 10:37 pm Post subject: It's a mystery to me

Bob,

  

 The brushes are housed in a unit that only goes on  one way.  I must have got the magnets in 180 out.  There was a batch  of these units that apparently had too much grease in the gear box and it  somehow migrates past the o-ring that seals between the gear box and the  motor.  The current flap motors don't seem to have the  problem.

 Thanks for clearing up my  mystery.

  

 Steve

 [quote]   ---

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n8zg(at)mchsi.com
Guest

Posted: Sun Dec 06, 2009 4:50 am Post subject: It's a mystery to me

Bob –   

This failure mode is common among the early flap motors.  There was no seal between the motor and the lead-screw mechanism, and grease would eventually work into the motor housing.  The design has changed, but the “fix” was a SB to disassemble / clean / reassemble.  

   

Neal  

   

===========.

    How was grease getting into the motor? Normally,

    there are no lubricants in a motor that put the

    brushes/commutator at risk for contamination.

    Gooey stuff on the comm is VERY hard on surface

    life.

        Bob . . .   

        [quote][b]

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wgill10(at)comcast.net
Guest

Posted: Sun Dec 06, 2009 7:15 am Post subject: It's a mystery to me

I have the later version of the flap motor assembly  and it too is prone to the same problem. After 500 hours, my flap motor became  inoperative due to grease in the brush area. The disassemble, clean and  reasemble process solved the problem. 

  

 Best regards,

  

 Bill

 RV-7 N151WP

 Lee's Summit, MO

 [quote]   ---

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