I followed one of your threads regarding a skidsteer with hydraulic issues. I have a 2003 cat 277b. The machine is working well and the arms and all other hydraulics are working fine. The implement hydraulics however do not. they will intermittently work at best in one or both directions from the thumb roller. I did the following from your thread:
1/ lift the cab hook a LED test light across one of the aux solenoid coils with enough lead to reach the in to the cab with the back in its lowered position operate the machine and check the status of the test light if it comes on while operating the machine yo may have an hydraulic problem
(did not come on)
2/ gain access to the 12 in connector for the RH joystick and check that you have power between pin 1 (8 vdc) and pin 2 ground return. if no power you need to check that the ECM battery voltage between pins 1 and 3 at the ECM.if no power at the ECM you have a possible harness problem which will need to be addressed.
(had the voltage)
3 /If all this is ok, next check that you have a signal coming out of pin 3 at the 12 pin connector (check with multimeter set on duty cycle setting and connected to pins 2 and 3) while moving the joystick you should have a varying duty cycle reading.
(results were 50%-53%)
4/ if that is ok you need to check the duty cycle output from the ECM between pins 42 and 58 and 42 and 40 .
(1.4% with no buttons pressed is this normal?)
5/ if ok check the duty cycle at the control valve aux solenoid coils using extension test leads that will reach in to the cab
6 if this is ok check the resistance of the control valve aux solenoid coils
(the front solenoid coil nearest the front of the machine without pressing roller button 66.6hz,.6% duty cycle, and 61% with button pressed(note: this time when i pressed the button it worked but stopped working shortly after). The back solenoid coil i checked and it read 590HZ,1.4% with and without pressing the roller button.)
note: the roller button has over the course of the last week or two worked spontaneously both rolling forward and back
this is as far as i got with your list of items to check. what are your thoughts? thank you for your time in advanced
if there is no output at the ECM and you are positive that you have good power and good earths there iis only one thing lef to do before condemning the ECM and that is to try to reflash the ECM unfortunately unless you have a dealer version of ET you cant do it your self
have included an electrical schematic
if you need additional info please ask