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Ford 555 Hydraulic Cessna Pump 24505


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  #11  
Old 03-20-2017, 07:44:33 PM
TomBall TomBall is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

Bikehead, What series of 555 is it. The older ones had a screen in the bottom of the hydraulic tank up by the radiator. It was common for these to plug up and you would have to unbolt the assembly from the tank and clean it. It would starve the pump and make a whining noise. That would not build excessive pressure however. In the stack of backhoe control valves is a main system relief valve if I remember correctly. It controls maximum pump pressure. Possibly it plugged with debris? Not sure how it would get past the filter unless a hose is degrading internally. Do control functions work at all when you first start it? Also, does the engine labor at this time? That's all I have at the moment.
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Old 03-21-2017, 12:50:20 PM
bikehead bikehead is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

I will have to check on the 555 model. It is very old. '70s maybe. The controls do not work at all. I think you are right, the engine is laboring. I thought at first it was just not running well, but I think it may be starting under a load, because it seems to come up slowly.
I will check the screen, however, I dont think it is starving for fluid. The pump is quiet.
I will pull apart the main relief valve. I need to get the seat out of the way. Its hard to get back in there.
You mentioned how would debris get past the filter. I thought the filter was on the return side (low pressure)?
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  #13  
Old 03-21-2017, 06:16:37 PM
TomBall TomBall is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

I think you are right about the filter. The tank screen could tear a hole in itself from collapsing if plugged. I have seen this happen. I don't think debris would get through the pump without causing damage. I know how hard it is to get to those rear valves because I've been there. Keep chipping away at it and maybe you'll stumble on the problem.
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  #14  
Old 03-21-2017, 08:14:47 PM
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PFT PFT is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

If there is any quick connectors in the lines, check to make sure one hasn't partly disconnected. That would stop the flow real quick. Just a thought.
PT
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  #15  
Old 03-22-2017, 12:57:30 PM
bikehead bikehead is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

True. I dont think this tractor has any quick connects. It is a construction machine. I first need to wait till the weather is better. Its still cold and muddy where this is parked.
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Old 06-04-2018, 01:41:58 PM
oldhousehugger oldhousehugger is offline
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Default Re: Ford 555 Hydraulic Cessna pump 24505

Hope this isn't too late in helping since I'm reading this a year later but here's my 2 cents worth. Iíve got a 4500 the older version of the 555. The backhoe valves and linkage were shot on mine and a bear to get at. What I did was cut out the floor plate all the way around the valve assembly and lift the whole mess out of the hole with a forklift.
In preparation for reinstalling the floor plate I welded flanges to the top surface of the piece of floor plate I had cut out. I then drilled a number of holes around the edge of the flanges and through to the existing floor plate.
Then after repairing the valve assembly and replumbing it as best I could I dropped the fixed unit back into the hole and bolted the floor plate back down.
I have used the old thing hard since then and it appears as though there was plenty of strength left in the outer edges of the floor plate so I see no stress cracks at all.
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