2011年7月22日金曜日

Repair working chair




Inconvenient oil pressure circuitry was inspected with some overhaul procedure.Careful checking led me to the conclusion that the solenoid valve for up and down cylinder pressure N/A. Almost of this kind of error is carried out by the thermal fuse puncture.
In spite of upper treatment, the valves up and down does not work! How come?
From now I will proceed to deeper inspections, descriptions later:

The criminal of up & down dysfunction on working chair was just a thin oxide film formed on relay terminal touching surface, the function was not used so long time though back lay down and up functions were used regularly.

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