PC120-6 EXCEL speed of all work equipment slow. i haven't met such a machine before because it's have one main hydraulic pump and one MR valve (no port valves ) pilot pressure is ok. i adjusted LS valve and PC valve on main hyd pump but no chance. boom speed slower than other. main pressure can be reaches 310bar fully adjusted. anybody have idea for this. any suggestion would appreciate. thanks in advance.
Did you check the fuel supply to the engine? Strainers and filters get clogged and then the hydraulics get backed off because of the loss of horsepower.
yes fuel lines ok. no engine drops
have you check your hydraulic filters??
check your solenoid lock valve & self pressure reducing valve
where are these located?