How to adjust flow pressure on 315cl Aux

GCC · Mar 16, 2019

Hey guys i plumbedy 315cl used cat foot pedal pilot hydraulic. So heres my problem when i activate curcuit the pump just sends 40gpm at 1400-1500 psi basicly max pump capable flow. I need to get up around 2500psi which I'm guessing need to slow pump to only put out 35gpm anyone got an idea how I can do this

funwithfuel · Mar 17, 2019

That all depends on how you're set up. I believe, beside your option spool, should be a 2 stage port relief. You would want to raise your working pressure there. Flow is typically set by a potentiometer or a setting on your display panel. My guess is your option was originally set up for a thumb as 2500 is typically a safe number to protect that circuit.

GCC · Mar 17, 2019

Its all got to be done mechinally it have inline relief going to hammer and then relief tank problem is can only get 1500 on the circuit it came from factory with blank plates in the relief ports. At full throttle if I push aux pedal forward it activates hammer and the pump pushes max flow and at max flow it can only produce 1455psi max no matter what you do. So my thoughts are I can restrict the spool opening 100% an this should stop the nfc from pulling right down which wiuld slow pump demand and increase pump produced pressure but the thing is when i control it by pedal I watch pump pressure go up to 2500-3000 psi but then the aux circuit actully reduces to 1000psi or just over. Infigured with pump pressure increasing the aux curcuit should see the increase also but lose the 40gpm to maybe 35 gpm.

funwithfuel · Mar 17, 2019

Ok, first off, do you have a flow meter? How are you checking circuit pressure and flow? Is your machine equipped with 2 pump flow. It sounds like you might be on one pump alone.

GCC · Mar 17, 2019

No 1 pump flow using the optional circuit in the valve body. My hammer needs 1950-2600psi and 21-39gpm. In the service manual it states at 2150 rpm no load u get 40gpm at 1455psi and at 2150rpm and 36gpm is 2291psi. So i was thinking if I ran it at 30 gpm that should get me to 2600 psi. To check my pressures i can see them on monitor but also have gauges and hoses hooked up.

funwithfuel · Mar 17, 2019

So, wide open, no load , full stroke, your pump is only capable of 39.5 gpm. You start loading her up, you're gonna lose a lot more than 5 gpm. What is your psi/flow target?

GCC · Mar 17, 2019

2200-2500 and I'm sure the flow will be over 21gpm min

funwithfuel · Mar 17, 2019

Did you install port reliefs? Are you single or bi-directional flow? Did you install a factory kit? I know you said used, but is it Caterpillar manufactured? Do you have a 3 way valve at the base of the boom on return side. Are you checking pressures with valves open or closed.

GCC · Mar 17, 2019

Ok so i ised cat foot pedal and then bought flared 1" tube going down the boom stick and ball valves at the end of the stick then i have on the return side a 3 way valve that dumps to tank and the pilot pedal feeds the spools on the main body i put in-line relief valves with gauge ports built in at base of boom and relief to tank also buu can cap the relief lines and it doesnt help build pressure in the curcuit.

GCC · Mar 17, 2019

Its basic a cat system 5 design Where its mechanical. The nfcpr valve for the cat sustems 3,11,14 is like 4k on it on. And thats just a little valve body and electric relief amd allows u to control pump from monitor. I plumbed a 315c like 7 years ago to run same hammer but dont remember what i did to control pressure and flow

funwithfuel · Mar 17, 2019

Ok, if you dead head the high pressure hoses at the end of the stick, either by cap or shut-off valve you still don't yield any pressure increase, then you would have to increase the pressure at the port relief. Set the port to max pressure for tool you are running. Flow would be dictated by the FCV at the base end. Does your computer know that you have installed hammer/shear plumbing?

funwithfuel · Mar 17, 2019

I don't know if this might help. Its obviously from a different model. Hopefully there is some commonality between the two.

GCC · Mar 17, 2019

Ya you dead head the lines and the pressure remains the same and the line reliefs are max out and not releasing oil and its all the pump makes unless u activate a different circuit then the pump jumps 5000 psi

GCC · Mar 17, 2019

But still doesnt increase the aux curict pressure

DEMLONE70 · Mar 17, 2019

Serial number would help

GCC · Mar 17, 2019

Cft00323

funwithfuel · Mar 17, 2019

I would look to see if you are receiving full servo oil to the spool . If you are, with the pedal fully depressed, then I would say your pump flow controller must be at issue. Where are you gauging pressure, at the pump or at the implement? The fact that you pull another function and spike to 5k is a bit odd. It does tell us that your pump is strong. It also tells us that your pump is not fully stroking for the aux circuit. In fact I think your pump is barely moving off axis. I think perhaps we have a line crossed. We aren't telling the pump to work.

GCC · Mar 17, 2019

Pressures are messured off the pump head and the inline regulatoe i have at base of boom where hose go to valve body have gauges at both when aux curcuit is active nothing else on that curciut wl activate because using 100% flow to aux curcuit. But soon as u let off the pedal you can work all yor other circuits and they all funtion correctly there is no pump control on this machine for aux cicuit other then it uses the negative flow lines to control pump and i think whats happening is but putting full pilot perssure from pedal to spool it then tells pump full flow and the best pressure it can build at full flow is 1455psi the numbers i have provided are out of service manual and what cat classes as new pump flow pressure spec

DEMLONE70 · Mar 17, 2019

Flow and pressure need to be adjusted trough monitor

GCC · Mar 17, 2019

I think I'm gonna have to buy the aux pump controller to make it work at 4k in canada for 171-0188

How to adjust flow pressure on 315cl Aux

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