YAMADA NDP-20 Maintenance Manual

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

Contents

YAMADA NDP-20 Maintenance Manual Manual pdf 11 page image

86. Throat bearing and Pilot valve Assembly6.1 Removal▪ Remove the diaphragm and center rod (see [5.1 Removal]).▪ Remove the 8 retainer bolts from the air chamber, andremove the air chamber and gasket. [Fig.6.1]▪ Draw out the pilot valve assembly. [Fig.6.2]▪ Draw out the throat bearing. [Fig.6.2]▪ Remove the packing from the throat bearing. [Fig.6.3]6.2 Inspection▪ Throat bearing [Fig.6.4]Measure the inside diameter, and if it is outside the usablerange, replace the throat bearing.Usable range of throat bearingØ 18.03 ~ Ø 18.14 mm▪ O rings, PackingIf the O ring is worn out or cracked, replace it.▪ Pilot valve assemblyIf the pilot valve is worn out or cracked, replace it.6.3 InstallationFor installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.Tightening torque for air chamber retainer bolts18 N•m▪ Make sure there is no dust on the seal surface and theseal is not damaged.▪ Apply grease to packing.

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