MR K my excavator serial # is YP-0217
By the way, on this Model, there is a switch in the right arm rest. It is hidden way in the back. Thru some other research, I've found that this bypasses the hydraulic computer. It now operates as it should ( I think, Havent had a chance to use it much though)
hi drip,
thanks for posting here. i am attempting to keep posts on kobelco models in one location.
a library of sorts, common issues that may arise. i have heard that most read the posts and i cases end up finding a solution to a problem they are experiencing
and end up sorting themselves out.
this switch you mention is what is called by kobelco a " KPSS RELEASE SWITCH " in some models such as yours its located inside the r/h console at the back,
usually a removable rubber grommet covers the access hole. if this switch has never been touched or replaced generally when the switch is flicked up this will turn off the computer putting the mechatronics system into " LIMP HOME " mode. it is not meant to be run constantly this way, its too hard on the main hyd pumps and you'll reduce their life expectancy greatly. toggle switch flicked down is having the computer on and the c-1 controller can operate as should to help control the horsepower
keeping the engine rpm up by helping to destroke the pumps thru the pf solenoid on the pump assy normally when something is not quite right such as a hyd system problem or weak engine. fuel problem, turbo, etc...
the pf solenoid is always helping to a small degree but when the computer senses too much rpm drop the computer sends a higher mA signal to help out.
when you shut-off the kpss rls switch the power off a fuse is fed thru a current limiting resistor and the pf solenoid cuts the oil flow to about 1/2 at all times.
it is fairly easy to verify if computer is controlling the pf solenoid or not.
the pf solenoid is proportional acting and threads into a block.
there is a test port on the block. 1/4" JIS, BSPP threads. stick a 1,000 psi hyd prs gauge on and observe when operating the machine.
the hyd prs should vary with the load on the engine. if not, if hyd prs is steady then the switch is in direction of shutting off the computer (limp mode).
if no hyd prs is registered, either the fuses are blown, 1 amp/5 amp fuses, current limiting resistor is bad, connections rotted, pf sol coil is burnt out
13.5 - 30 ohms ?, or c-1 computer pcb is burnt and i maybe able to repair.
pf sol power - c-1 sends 24 vdc. one wire is + the other is the ground wire.
if you do not mind please send me an e-mail to "
hf_hydraulics@hotmail.com " and afterwards if you like provide me your findings.
you could have a few issues you maybe unaware being the age your machine is.
cheers!
adam
