TJSuper21

Hi All, Just wanted to thank all of you for the assist. Your right, overhauling the pump was an education. I worked with my A&P and put in all new o-rings. The nylon washers were in great shape. I did find a small sliver of o-ring across the input check valve ball. Reassembled and then took hours to figure out the settings. The flaps are fulling extended at 5 pumps however, I have to pump a few times to get them to stop creeping up. Once I pump a few times, it stops so I still have some air in the system. I will need to do disconnect the bleed screw and pump the flaps to push the air out. Thanks again! -T-

Yes it was. 4 pumps to full flaps, but the retract was almost immediate. I actually thought that was normal until reading through all of the threads and now understand that the flow should be restricted so on the ground it should take 8-10 seconds. I checked the set screw and found it to be loose. I was hoping that once I tightened it and adjusted the retract speed, it would fix it but it did not (I pumped it down once, then held the flap handle, raised the flap switch to retract and the flap retracted smoothly! I pulled the pump out today and now have my kit so tomorrow I will open it up. If I find something interesting, I will take photos.

Hi Ross, thanks for all the advice. My A&P bled the system but no luck. It still continues to do the same thing. I pump the flap handle and the flaps go down but the handle springs back and the flaps retract. It seems I can only pump it once and the flaps don't stay down. Could that be the check valve? I really hate to take anything apart but obviously something is not right.

I lowered the belly panels and it is dry as a bone. No evidence of a drip. The pump does not show any sign of leakage. Unfortunately was not able to bleed the system but will do today. I tried to order the rebuild kit from LASAR but they were out. I found one at Knots2U HE625/HE1506 Mooney M20 Series Hydraulic flap actuator 65-67 M20C, M20D, M20E, M20F - Knots 2U, Ltd. if anyone is looking for one.

Hi and thanks for the advice. I am going to drop the belly panel this morning and inspect. I printed Ross' 12 step program and will bleed the system today with my A&P.

Hi, Yes, double checked it yesterday and all is fine there.

Hi All, Great information. I now have a flap issue which would seem to point to the actuator. Yesterday I was on approach and pumped twice and the flaps extended. I went to put the 3rd pump in and the flap handle went limp. I pumped with no resistance. I did a go around and the flaps that were down retracted and I headed back to my home airport. This time on approach, flap handle had no pressure and I was unable to lower flaps. After landing and getting to my hangar, the symptom changed. I feel pressure when I try to lower the flaps , on the first pump the flaps go down but, the handle immediately bounces back and the flap retracts. I have ordered a rebuilt kit for the actuator also, I do not detect any leaks. Can anyone provide any advice on what to check?

Hi Rodney, I know this is a long shot however, do you happen to have the file you sent to front panel express to manufacture the fuel switch template? Best Regards, Tony