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Cessna Hydraulic Pump Question.


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#1 IamSherwood OFFLINE  

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Posted August 05, 2012 - 09:36 AM

Someone told me that these Cessna pumps where used on some GTs.

I'm hoping this is true, and someone can help me out here.

Here is the pump, as it was installed by previous owner, in a GT I recently bought.
On the casting it says Cessna Made in USA 16C8 (model??) Pat No. 28095


P1010052.JPG

I've removed it, and am in the process of building a hydraulic dump trailer, using this
pump, powered by a 3hp B&S.
It worked fine, as it was installed. Once I removed it, I noticed an arrow, which I assume
indicates direction of rotation. I built the pump and motor mounts to suit that arrow.

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It doesn't work. So I ran the pump backwards, using a drill. It works.
I have to assume, that the PO reversed the innereds of the pump, to make it
fit his application. Before I go tearing the pump apart, trying to figure it out, I was wondering if anyone here has knowledge of this.

Thanks

#2 olcowhand OFFLINE  

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Posted August 05, 2012 - 10:19 AM

Wish I could help, but not familiar with those style pumps. Our Massey 175 has a Cessna power steering pump, but I know it's not reversible. Yours must be, with the arrow being there & it running the other direction of rotation.
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#3 John@Reliable OFFLINE  

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Posted August 05, 2012 - 10:23 AM

Wish I could help, but not familiar with those style pumps. Our Massey 175 has a Cessna power steering pump, but I know it's not reversible. Yours must be, with the arrow being there & it running the other direction of rotation.

I've never done it myself, but I too have been told that just about any pump can be reversed, so you might be on to something about yours
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#4 IamSherwood OFFLINE  

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Posted August 05, 2012 - 10:24 AM

Yeah Dan, that's what I'm thinking, but I don't want to screw it up. If I have to, I'll reconfigure the motor and pump
mounting, but I'm hoping for a simpler answer in the pump.

#5 Bruce Dorsi OFFLINE  

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Posted August 05, 2012 - 10:31 AM

Is there enough room to put on a longer belt with a twist in it to change rotation that way?
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#6 IamSherwood OFFLINE  

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Posted August 05, 2012 - 10:42 AM

Is there enough room to put on a longer belt with a twist in it to change rotation that way?


I was debating lengthening the tongue. If I do that, then yes, I could move the pump closer to the hitch. That may just
be the simplest answer. Thanks. I'll go scratch my head about that for a bit.

#7 olcowhand OFFLINE  

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Posted August 05, 2012 - 10:45 AM

Hard to get the idea without a pic of the trailer. If lengthening the tongue, then I'd just flip the pump to avoid running a twisted belt.

#8 DH1 OFFLINE  

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Posted August 05, 2012 - 11:05 AM

Sounds like you need to mount the pump the way it was on the tractor so that it spins the same.
If you put a twist in the belt it will work but belt wear will be high.
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#9 IamSherwood OFFLINE  

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Posted August 05, 2012 - 10:04 PM

Hard to get the idea without a pic of the trailer. If lengthening the tongue, then I'd just flip the pump to avoid running a twisted belt.


Downside of doing that, is then weight of motor, and pump will be on same side of the tongue. Also, I'll have to redesign/alter the
valve control handle.

I'm kinda busy, for the next week, so I think I'll just leave this project alone, and maybe, hopfully I can get some info about putting the pump back to original.

#10 ducky OFFLINE  

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Posted August 06, 2012 - 08:27 AM

Will, Looking at the pics it appears that the front cover and the gears could be flipped 180* and that would reverse the direction of rotation.
looks like the reservoir has to be removed to get at the bolt that hold the pump together.
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#11 Cvans OFFLINE  

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Posted August 06, 2012 - 10:31 AM

My Johnson loader came with a Cessna pump. It's small but flows a lot of oil. I am having some problems with the front seal staying in place as the seal bore is about .001" to large. Going to try and loctite it in there. Other than that it's been a good pump. Some where designed to rotate either direction. Mine was not. You should be able to purchase parts or a rebuild kit through any hydraulics service center.
Good luck with your project.
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#12 IamSherwood OFFLINE  

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Posted August 08, 2012 - 09:58 AM

Will, Looking at the pics it appears that the front cover and the gears could be flipped 180* and that would reverse the direction of rotation.
looks like the reservoir has to be removed to get at the bolt that hold the pump together.



Yes, the reservoir would have to be removed.
I just took a closer look at it and found an arrow on the bottom as well.

It's pointing in the same direction as the arrow on the top of "This Plate"

P1010068-2.jpg

#13 IamSherwood OFFLINE  

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Posted August 23, 2012 - 06:48 PM

A while ago, I gave up on the idea of trying to reverse the pump, and went ahead, and remounted it, and
reconfigured the control handle. Over the last 2 weeks, I've been tinkering on this dump trailer build.
Today, I got it to the point I could test it. It still needs a tongue jack stand, and some sort of guard/shield
over the engine/pump. It's nothing fancy, but it's tough, and it works good. I spread a couple of loads of
"A" gravel. At 2/3rds throttle, neither the pump or motor sqwauked a bit. I'll slap some paint on it yet, and am debating
about lowering the axle, and putting some wider tires on it.

First pic is what it was.

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P1010112.JPG
P1010113.JPG
P1010114.JPG
P1010115.JPG
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#14 Cvans OFFLINE  

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Posted August 23, 2012 - 07:14 PM

That's neat. Ain't it fun when a project comes together. Thanks for the photos.
P.S.
My Cessna pump wasn't leaking after all. It was the power steering hose.
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#15 KennyP ONLINE  

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Posted August 24, 2012 - 05:35 AM

That is awesome, Will! Love your tailgate latch. Seems I've seen something similar posted somewhere. :bigrofl:
I like your chains for spreading too. Glad it is working for you.




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