65C_flier Posted July 11, 2018 Report Share Posted July 11, 2018 Has anyone experienced a PC that won't disengage? My 1965 M20C has the basic wing leveler, but it has the electric solenoid (and yoke button) to disengage the PC. The wing leveler works great, but pushing the yoke button doesn't disengage. Not a major problem, but a bit annoying. The yoke button has been checked and works perfectly. My A&P has also checked the solenoid and reported that it works (the yoke switch causes it to open/close). I'm out of ideas as to what could be causing it to stay on? Quote Link to comment Share on other sites More sharing options...
Pictreed Posted July 12, 2018 Report Share Posted July 12, 2018 Mine acted the same way so I pulled the button out of the yoke. Quote Link to comment Share on other sites More sharing options...
timj0rdan86 Posted July 12, 2018 Report Share Posted July 12, 2018 i have a 67 F model and i am having a similar problem and was just reading in maintenance manual that you should test the Pilot Valve Operation ( cut-off valve) and replace if it is not shutting off completely. i have a suspicion this is the problem with mine, the main push/pull switch for the wing leveler does not disengage it nor does the shut off valve on the control yoke. do you have any idea the cost of a new pilot valve or the maintenance required to replace it Quote Link to comment Share on other sites More sharing options...
Shadrach Posted July 13, 2018 Report Share Posted July 13, 2018 Same year, same model, same problem... started trouble shooting on Monday. My yoke switch checked out fine, so I think its the pilot valve in my case.  Quote Link to comment Share on other sites More sharing options...
carusoam Posted July 13, 2018 Report Share Posted July 13, 2018 Welcome aboard, Tim and MB... Thought I was seeing the same thing in another thread.  Turns out Ross/Shadrach had posted that challenge in a thread yesterday... See if that helps? Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Shadrach Posted July 13, 2018 Report Share Posted July 13, 2018 On 7/11/2018 at 6:00 PM, mbiggs said: Has anyone experienced a PC that won't disengage? My 1965 M20C has the basic wing leveler, but it has the electric solenoid (and yoke button) to disengage the PC. The wing leveler works great, but pushing the yoke button doesn't disengage. Not a major problem, but a bit annoying. The yoke button has been checked and works perfectly. My A&P has also checked the solenoid and reported that it works (the yoke switch causes it to open/close). I'm out of ideas as to what could be causing it to stay on? If yours has a solenoid it differs from mine. Quote Link to comment Share on other sites More sharing options...
65C_flier Posted July 13, 2018 Author Report Share Posted July 13, 2018 Thanks carusoam and Shadrach. It sounds like the pivot / pilot valve or filters might be the culprit. Quote Link to comment Share on other sites More sharing options...
FloridaMan Posted July 13, 2018 Report Share Posted July 13, 2018 Mine seems slow to disengage. I thought it was normal because of all the vacuum in the lines and servos. Quote Link to comment Share on other sites More sharing options...
takair Posted July 13, 2018 Report Share Posted July 13, 2018 Kinked disconnect button line can do the same. Â Trace the line through the yoke and to the valve. Quote Link to comment Share on other sites More sharing options...
timj0rdan86 Posted July 14, 2018 Report Share Posted July 14, 2018 had my a&p check out my system the yoke button works so pilot valve is good he suggests cleaning the solenoid that should fix the problem Quote Link to comment Share on other sites More sharing options...
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