Hi all. New here so hopefully i get this rite, I have a Kobelco sk135 fairly early model, Problem is (to start with) the machine can start up and work fine until switched off, restart then sometimes the engine will be under slight load, Which then at high revs and dead ending a circuit more or less stalls the engine, Stop engine wait for the ecu to totally shut down then restart would work fine again untill the next time you switch off, Does not do it everytime but intermintant fault to start with. Now its doing the fault more and more, No error codes, Swapped controller with another machine and fault never showed on it, Would anyone know of the voltage to be measuring at the pump proportional solenoids? Any help with this would be appreciated Thank you
It sounds like a parasitic load on your pumps. Something is having one of your pumps stroking up when it’s not needed. I would check your standby pressures on your pumps. Maybe someone on here who is more familiar with your machine could tell you the best way to do that. Either way I would like to know what the problem was. Good luck and good day.
Hi Paul Thanks for the reply, If i disconnect the plug from each proportional valve on p1 and p2 each one has a slight load until disconnected, Hopefully someone has had something like this before.
Check your negacone pressures at neutral.
Might be bad unloader.
If machine kinda sluggish to start moving on some functions could be plugged drain orifice at unloader.
Did you plug the lines from solenoid and left ports at regulator open, or plugged and capped everything?
And another tricky question - did anyone took the regulators from the pumps and missed mechanical feedback linkage on reinstallation?
Forget this question, I misunderstood your statement!
Hi. The pumps have been fully reconditioned a few months back. The machine can start and run perfect for long enough. Problem seems to arise when it's switched off and restarted. It maybe fails 4 out of 10 start ups
If you have slight load on the pumps at neutral it means you have a problem with negacone pressure regulated by unloaders at the end of galleries of main control valve. Powershift PRV destrocks pump when KPSS sees drop of engine rpm. But there’s possibilitie that your regulator(s) was installed incorrectly - it is possible to miss the pin(s)
What led to pump reconditioning? Could there be trash in the control valve due to previous pump failure?
Sir,do you have kobelco sk135-2 service manual My email is [email protected]