RobertE,
I am the 3rd owner of said aircraft. The airframe has about 1800 hours on it now, and I don't know if this motor has brushes or not. My A&P sent it (the motor) to an outfit out west to be rebuilt. Indications of the the impending failure were something like this: On 2 prior occasions, I had to use the emergency extension because the normal system did not extend the gear fully. On the last event, I tried twice to lower the gear normally, and on the second attempt i heard a short whirling sound followed by the CB popping. When that happened, I reset the CB (which held), retracted the gear and Then started the emergency extension. I pulled about 18 times (which is about 4 more than normal for this plane) and still no gear indications. I then carefully pulled a little more until it felt stiff and I just did't want to press the system any further so I stopped. Still no gear indications. At this point I decided to reset the manual clutch handle and secure it. After securing the clutch handle, I reset the gear control CB, and both gear down indications appeared. Maybe I just missed the little green football in the floor window prior, but I don't think so. That indicator is purely mechanical, and the CB should have nothing to do with it. Regardless, I was happy to see the indications and landed successfully. The next day I flew the plane gear down to my A&P for his inspection. He jacked the plane and concluded that the motor was bad. Now waiting for the motor to return and the retesting of the system on jacks. The 3 incidents of no normal gear ext were about 3 months apart. That aside the gear has performed flawlessly for the last 8-9 years. I know I'm rambling here, but I'm trying to give you all the info I can think of historically, because I just don't think there is any definitive way to tell if the motor is failing until it does. This is an '88 J model with about 1800 hours on the airframe. I've been trying to fly 100 hrs per year minimum, but have yet to make that lofty goal.