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New Gear Pumps

Mines original best I can tell from the logs and always like to change old parts before they fail and interested in the cost of course like others.


FS

Are you saying the 28V pump was designed for a higher output/flow on the hydraulic pressure etc and would explain the higher amps ?
 
CenAir said:
Are you saying the 28V pump was designed for a higher output/flow on the hydraulic pressure etc and would explain the higher amps ?
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If you watch them in action, the 28v pump definitely moves the gear more quickly than the 14v pump.
 
I'd Be interested Jim. I had mine rebuilt a few years ago. It would be nice to have something more reliable.
 
On jacks - I have timed mine multiple times and up it is about 10 to 11 seconds. Down around 5 secs. Hydraulic dump -- down immediately on the ground.
Hydraulic dump in the air is immediate for the mains but the nose has to have less than or around 80 kts before it will thump in and get a green light.

My wheels retract and deploy in the same sequence as in the you tube video above.

Thanks for posting the video..
 
I have hung a camera on the tail and interesting that the sequence is not always the same. Mains come down first but sometimes it is the right and sometimes left that is leading.
They do operate different in the air then on the ground.
 
Commander91gm said:
Video of gear in operation.

https://www.dropbox.com/s/f9p13hx7zb...0down.MOV?dl=0
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Mine has never change since I have owned it -- the nose is first and the right is next. If mine changed I would wonder what was wrong.

Michael your landing gear operates in the same sequence as mine. I have landed at Salem a lot over the years. Great place to eat for sure!
BTW I try to keep the belly of my airplane clean -- yours is fantastic looking. It does take a lot of work to keep them that way.
 
Frank said:
Mine has never change since I have owned it -- the nose is first and the right is next. If mine changed I would wonder what was wrong.

Michael your landing gear operates in the same sequence as mine. I have landed at Salem a lot over the years. Great place to eat for sure!
BTW I try to keep the belly of my airplane clean -- yours is fantastic looking. It does take a lot of work to keep them that way.
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Thank you Frank. I try to fly to Salem once a year and do eat at the airport restaurant while I’m there. Great food. As far as cleaning, I wash once a year then use furniture polish over the plane. Then when things get a bit dirty I can spray the polish again the the dirt wipes off.

Right now my gear pump is off to be overhauled so I’ve been down for a few weeks. We had a bit of a communication issue (misunderstanding) that slowed things down. Not a big deal as I am in no rush. My pump has been working for quite sometime, maybe 10 years or so. For something that functions multiple time per flight being turned on and off that’s a pretty good life span. After being rebuilt, and the life span is shorter, maybe a new valve body is in order? Looking at other sites it looks like the valve body is the bottom plate. The rest is the fluid reservoir and pump motor. It also looks like these pumps are still being manufactured today. Would it be possible to have a process to get the new pumps certified for aircraft?
 
If your gear motor/pump hasn’t been apart since it was new, you wouldn’t believe the mess that the brushes have created inside that little black motor case. It reminds me of the black lava found on the big island of Hawaii, only soft and gooey.
 
The brushes and bearings for the motor are readily available so no problem with that part of the rebuild. I have one of those rebuild kits on my parts shelf, in fact.

For those of you that remember the Kelly fiasco from about 10 years ago, it does tend to underscore that the life of these units does have some relationship to the quality of the rebuild including parts used. The Kelly rebuilds tended to last about 15 hours. Many originals lasted 25+ years and thousands of cycles.
 
My pump is the original from 1976, I do have spare pump in my hangar from a 114, same pump as mine. When my goes will get spare rebuilt and installed.
 
Before I send my original pump in is there a New Style power Pack available yet?
 
If you can get parts it shouldn't be that hard to rebuild the pump. The motor is fine on my pump, Has a leak internally. I'm with the guy who said it bothers him to spend $1795 for a bad o-ring. It's not the price really, it's the repair cost that bugs me.$.79 o-ring or check valve replacement cost that bugs me. If they rip everything out that wears out and just start with the casing that's different.All new parts that would be worth it then.
 
Update on hydraulic motor, has anyone pulled one of these pumps apart?
I have and it’s a shame what they do to replace the bottom part of the pump. It has adjustments,spring tension. All the repair people do is replace the gear bottom and it’s a go,15min later except if the motor craps out. Made so cheaply and poor engineering. I would think someone could come up with a much better design and reasonable price. If you have to have your pump rebuilt because you can’t get the parts anyways take it apart and look inside,you will be surprised and disappointed in the pump and manufacturer
 
So, is there any progress on the New Pump replacement? I believe mine is Original to the Airplane as well, and I would much rather have a new one then one that's been overhauled.
 
atjudge said:
So, is there any progress on the New Pump replacement? I believe mine is Original to the Airplane as well, and I would much rather have a new one then one that's been overhauled.
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I have been through three or four pumps over the years so if it is original you are one lucky guy or the airframe has limited hours.
 
Commander91gm said:
I have been through three or four pumps over the years so if it is original you are one lucky guy or the airframe has limited hours.
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The gear pump is one component of our airplanes that all of us need to become intimately familiar with. It's foolish to not have a plan in place for the eventual failure of your gear pump. How extreme each person is in their planning may differ, but everyone should at least know who they're going to take their plane to, and where they're going to send their pump for overhaul.
 
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