Great video. Mine just started doing the same thing couple days ago and today I replaced o-rings in the hoof or dump valve, 3 total and it’s still doing same and tomorrow I will be capping off each gear and individually seeing if they are culprit. If it is the pump, high pressure valve, would your repair do this is it was sent to your shop!
I have a 1977 Piper Arrow III. Just before annual I had tested the landing gear several times and it worked properly. On the day of the annual inspection the mechanic and I did the gear tests and they went well. Then we did the emergency down test. The gear went down. Then when I tried to put the gear up there was a strange sound that came from the hydraulic pump. It was like a motor boat prop cavitating. That lasted a second and I pulled the circuit breaker. We ran the test again, the gear went up then the hydraulic pump went on and off intermittently each couple of seconds. Apparently the pressure was going down and the pump was pumping it back up every few seconds. We put the gear up and removed the electricity, the pump stopped pumping and the gear started coming down by itself. Within a minute all three wheels were fully extended. I an find no leaks in the system anywhere. No red fluids in or out of the aircraft. It has to be a valve of some sort that is not closing. I am ready to take the emergency down valve out and look at it but you said there is another valve at the hydraulic pump. Can you give me some more information on that and what you may think the issue might be?
Sounds like the “gear up check valve” is leaking internally. It is on the bottom of the gear pump assembly. I will send some information to you when I get a chance
Thanks for sharing. We have the same issue with our 1969 Arrow 180. After gear up, pump cycles intermittently every 2-3 sec.Checked and replaced all cylinder o-rings. Traced the problem to the pump.
Great video. Mine just started doing the same thing couple days ago and today I replaced o-rings in the hoof or dump valve, 3 total and it’s still doing same and tomorrow I will be capping off each gear and individually seeing if they are culprit. If it is the pump, high pressure valve, would your repair do this is it was sent to your shop!
Thanks for taking the time and effort!
I have a 1977 Piper Arrow III. Just before annual I had tested the landing gear several times and it worked properly. On the day of the annual inspection the mechanic and I did the gear tests and they went well. Then we did the emergency down test. The gear went down. Then when I tried to put the gear up there was a strange sound that came from the hydraulic pump. It was like a motor boat prop cavitating. That lasted a second and I pulled the circuit breaker. We ran the test again, the gear went up then the hydraulic pump went on and off intermittently each couple of seconds. Apparently the pressure was going down and the pump was pumping it back up every few seconds. We put the gear up and removed the electricity, the pump stopped pumping and the gear started coming down by itself. Within a minute all three wheels were fully extended. I an find no leaks in the system anywhere. No red fluids in or out of the aircraft. It has to be a valve of some sort that is not closing. I am ready to take the emergency down valve out and look at it but you said there is another valve at the hydraulic pump. Can you give me some more information on that and what you may think the issue might be?
Sounds like the “gear up check valve” is leaking internally. It is on the bottom of the gear pump assembly. I will send some information to you when I get a chance
Thanks for sharing. We have the same issue with our 1969 Arrow 180. After gear up, pump cycles intermittently every 2-3 sec.Checked and replaced all cylinder o-rings. Traced the problem to the pump.
I own an Arrow and have the same Gear In Transit light maybe an hour after take off or in turbulence.
This is how the symptoms started with this aircraft.
Thank you sir.