hoot777 Posted August 17, 2019 Report Posted August 17, 2019 My 1968 m20G has a leaking hydraulic pump. Anyone know a good repair or overhaul company. Naturally just passed annual. Murphy was an optimist. Thanks Quote
carusoam Posted August 17, 2019 Report Posted August 17, 2019 There are threads around here that describe changing out the O-rings and chasing the ball bearing across the floor... Best regards, -a- 1 Quote
N201MKTurbo Posted August 17, 2019 Report Posted August 17, 2019 Although you could send it to Laser or DMax, you will still have to bleed it and adjust the retract speed on the plane. Once you get it out of the plane, you are 75% done with the reseal. Does it still pump well? If so, there are about 3 standard o-rings to change. Quote
Jim Peace Posted August 17, 2019 Report Posted August 17, 2019 18 minutes ago, carusoam said: chasing the ball bearing across the floor... This ^^^^^^ Quote
Shadrach Posted August 17, 2019 Report Posted August 17, 2019 How bad is the leak? If it’s just seeping a little bit I would order the kit and defer until it worsens. The pump is easy to reseal but there are a few caveats during the rebuild and reinstallation. Quote
RLCarter Posted August 17, 2019 Report Posted August 17, 2019 (edited) LASAR sells a rebuild kit or you can send them your pump. Get your A&P to do it and save the down time FlapPump.PDF Edited August 17, 2019 by RLCarter 2 1 Quote
carusoam Posted August 17, 2019 Report Posted August 17, 2019 Note on the flap adjust speed... The on the ground setting is really slow compared to inflight flap retract speed... The MM gives good guidance for on the ground speed timing to set properly, that later translates to flap retract speed in flight... If you set it while on the ground for a normal retract rate... it will be very quick to dump lift while in flight... surprise! PP thoughts only, we have copies of MMs around here as well... Best regards, -a- 1 Quote
RLCarter Posted August 17, 2019 Report Posted August 17, 2019 17 minutes ago, carusoam said: The MM gives good guidance for on the ground speed timing to set properly, that later translates to flap retract speed in flight... 8~12 seconds is called out on the PDF above, and as noted the adjustment is very sensitive and check the retract speed with the nut snugged on the adjusting screw 1 Quote
hoot777 Posted August 17, 2019 Author Report Posted August 17, 2019 thanks guys for the quick feedback does anyone know who made it off hand. I'm on the road trying to find where to repair it. Quote
N201MKTurbo Posted August 18, 2019 Report Posted August 18, 2019 I’m pretty sure it is made by Mooney. If you have a helper put some up force on the flap (10 Lbs or so) you will get the same rate as in the air. Quote
Immelman Posted August 18, 2019 Report Posted August 18, 2019 (edited) Went through this last month, a certain mooneyspace person was a big help! As mooney projects go, it was not too bad. Got my friendly IA to inspect and sign off. Costs were the rebuild kit, hydraulic fluid, and a garden sprayer and assortment of tubing to bled the system from the bottom up. This was also an idea I got here on mooneyspace. But now that I have done the project, and knew where the leak was coming from, I believe I could have solved it with a single O-ring. Its one of those things though, if you're going to open the system and take the pump out, may as well change it all. One thing that flummoxed me, extra parts. The lake aero kit includes two sets of o-rings for where the halves of the pump mate together. Use only the set matching the size that came out of the pump when you took it apart. Edit: I just saw you were on the road. One tactic might be to disconnect the hydraulic supply from the pump, cap the hydraulic line, make sure I had enough fluid for the brakes, and get home without flaps. Safe, in my opinion yes, legal not so much. Edited August 18, 2019 by Immelman 1 Quote
Shadrach Posted August 19, 2019 Report Posted August 19, 2019 1 hour ago, Immelman said: Went through this last month, a certain mooneyspace person was a big help! As mooney projects go, it was not too bad. Got my friendly IA to inspect and sign off. Costs were the rebuild kit, hydraulic fluid, and a garden sprayer and assortment of tubing to bled the system from the bottom up. This was also an idea I got here on mooneyspace. But now that I have done the project, and knew where the leak was coming from, I believe I could have solved it with a single O-ring. Its one of those things though, if you're going to open the system and take the pump out, may as well change it all. One thing that flummoxed me, extra parts. The lake aero kit includes two sets of o-rings for where the halves of the pump mate together. Use only the set matching the size that came out of the pump when you took it apart. Edit: I just saw you were on the road. One tactic might be to disconnect the hydraulic supply from the pump, cap the hydraulic line, make sure I had enough fluid for the brakes, and get home without flaps. Safe, in my opinion yes, legal not so much. A leaking flap system will not affect the brake system but it could drain the reservoir (which would not hinder braking). Quote
Shadrach Posted August 19, 2019 Report Posted August 19, 2019 On 8/17/2019 at 6:21 PM, hoot777 said: thanks guys for the quick feedback does anyone know who made it off hand. I'm on the road trying to find where to repair it. Just order the reseal kit from LASAR and let your IA R&R. Quote
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