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    Hitachi zx160 gets slow after 5 minutes of operation.

    Hitachi run good when cold and after about 5 minutes of working the machine the hydraulics slow down. Please help
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    Hitachi zaxis 160 excavator

    I'm having two problems with this machine. When cold the machine runs fine and after a while of running it slows down like its in turtle mode. Secondly, the throttle motor revs up when you first crank and then the machine dies. Is there a way to relearn the motor.
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    Kobelco hydraulic excavators

    I have a kobelco sk120, it runs fine but none of the hydraulics work. This machine has had seriouse electrical wiring issues in the past. is there a solenoid that cuts the hyds off? please help
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