YAMADA NDP-20 Maintenance Manual

Also see for NDP-20 series: Operation manual Operation manual

Contents

YAMADA NDP-20 Maintenance Manual Manual pdf 12 page image

97. C Spool Valve Assembly and Sleeve Assembly7.1 Removal▪ Remove the 6 retainer bolts from the valve body, andremove the valve body. [Fig.7.1]▪ Remove the 8 cap A and cap B retainer bolts, and removecap A, cap B, packing, plain washer, cushion and gasket.[Fig.7.2]▪ Draw out the C spool valve assembly, and remove the sealring from the C spool valve assembly.▪ Remove the sleeve using the sleeve remover (special tool:Part number 713148). [Fig.7.3]7.2 Inspection▪ C Spool Valve AssemblySeal ring [Fig.7.4]Measure the inside thick diameter, and if it is outside theusable range, replace the C Spool Valve Assembly.If the seal ring is worn out or cracked, replace C SpoolValve Assembly.Usable range of Seal ring2.94 ~ 3.02 mm▪ Sleeve Assembly [Fig.7.5]Measure the inside diameter, and if it is outside the usablerange, replace the sleeve assembly.Usable range of SleeveØ 18.63 ~ Ø 18.65 mm▪ O ringsIf the O ring is worn out or cracked, replace it.▪ C Spool Valve Assembly and Sleeve Assembly must bereplaced complete set. Unable to replace individualcomponent7.3 InstallationFor installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.Tightening torque for installation Cap A, Cap B6 N•mTightening torque for Valve body installation bolts7.5 N•m▪ Make sure there is no dust on the seal surface and it is notdamaged.▪ Install the sleeve at the center of the valve body. At thispoint, apply lubricating oil around the sleeve and O ring.

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