1st of all put your spanners away, and dont touch the machine anymore, until you know what your playing with. Im sorry to say, but you are going to have to buy yourself a manual ( if you want to do this yourself ) and a pressure guage ( 5000 or 6000 PSI guage ).
If the CAT mechanic comes out to your machine, he is going to have that manaul and read it twenty times over, so that he fully understands on how it works. So you might as well do it yourself !
-The steering works great with no problem
-The outriggers go down and up with no problem, but once they hit the ground wont lift the weight of the machine
-The front arm will come down, but has to be worked ALOT to get up
-The front buket will not tilt at all (all the way down at the moment
-the back swing seems to work fine
-the back arm works on one cylinder but not the other
-the back bucket seems to move ok.
Ok the steering should be its own seperate hydraulic system ( safety ), so that seems to be ok.
The rest the hydraulic problems are part of the same hydraulic system.
From reading your problems and what you have done, to me your pump is OK, it is just the pump management side of it.
2nd pic. This valve has a few different names depending on what machine they are. Pressure Compensator valve, DR/FR valve, plus many others, however they are all the same. They are all plumbed up differently depending on how the manufacturer wants his Pump management system to work.
The rear valve of this pic, is what sets your maximum system pressure, about 3000PSI.
The front valve is your minimum pressure, which could be set around 300 PSI.
Now the pipe going into the front of the valves is hyd pressure from the system. Now depending on how much pressure there is, will determine your system pressure.
Eg. If that small hydraulic line has 1500PSI in it, then add 300 PSI (minimum pressure set with spring pressure ), then the system pressure will be 1800PSI .
Therefore they system pressure can be set anywhere between 300PSI and 3000 PSI.
1st Pic: So what I have just said about the 1st pic, then I will take a guess and say its a regulator or a flow restrictor. Thinking more a regulator.
Ok why differnent pressure's? Im thinking it could be for starting up.
The pump has spring in it so that the pump is in the fully swashed position ( Swash plate is at full angle therefore pistons will be moving full stroke- ie Full flow ).
So poor old starter motor on the engine when cranking the engine over also is turning the pump over when its at full stroke trying to get the system to 3000PSI before the swashing back to a no flow position.
Therefore starting speed is going to be very slow and will eventually burn out motors.
So if the pressure is very low on start up ( 300 PSI ), the pressure will be met very quickly, and the the pump will swash back to a NO flow position, and the starter motor will be able to turn the engine over a lot quicker !
Now when you go to operate your hydraulic system, you then provide 300 PSI on top of the set low pressure (300PSI spring pressure ) therefore the system pressure will be 600 PSI, then 600 PSI on top of 300 PSI you will get 900 PSI now this will keep going until it gets to the maximum set working pressure of 3000PSI ( very quickly ! ).
Ok I hope your are not to confused as it quite hard to explain.
I have seen these same valves plumbed all very differently from Earthmoving machines, ROV's, test benches etc. And what I just explained earlier could be wrong. This is why you need to manual, so you can read what CAT have done in there Pump management system.
I hope you picked this up for a good price, because personally I think these valves just need a little adjusting, and you have one fantastic machine.
So hang in there mate, but the bare minimum you need here is the manual and a pressure guage.
The CAT manuals are pretty good. They will tell you how the system works and how to adjust them so that you get the correct pressure.
All the best
Duff :thumbsup:
