Hydraulic adaptor of maintenance
2, to see every piece of cast iron sections with or without grooves and flatness --- fine sandpaper or a grinder grind
3, in the end face of each installed iron ring, with the bolt tightening (first spool loaded fastening avoid distortion.)
Inspection spool shaft work: note the flat seal metric hydraulic fittings opening and closing time, two-way action tilt spool shaft should advance a little way back hole open (momentary increase in the anti-pressure, otherwise the car or grinding the end surface of the valve shaft shoulder adjustment ). Check the spool shaft bending.
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