YAMADA NDP-H50 Maintenance Manual

Contents

YAMADA NDP-H50 Maintenance Manual Manual pdf 15 page image

128. Valve switcher8.1 Removal▪ Remove the diaphragm and center rod. (see [5.1 Removal]on P.6-7)▪ Remove the 12 retainer bolts from the air chamber, andremove the air chamber.▪ Remove the valve body assembly. (see [7.1 Removal] on P.10)▪ Unscrew the two bolts on each retainer and then removeboth retainers.▪ Be very careful when removing the retainers. the springmay pop out.▪ Remove the spring retainers, bushings, springs, trip armsand O rings from each side.▪ Be careful not to drop the trip arms when removing them.▪ Pull out the pins in the direction of the arrow.▪ Remove the valve switcher in the direction of the arrow.8.2 Inspection▪ Bushing [Fig.8.3]Measure the inside diameter Outside diameter, and if it isoutside the usable range, replace the throat bearing.Usable range of sleeveInside diameter 7.5 mm~8.1 mmOutside diameter 11.5 mm~12 mm▪ Valve switcher [Fig.8.4]Measure the inside diameter, and if it is outside the usablerange, replace the throat bearing.Usable range of sleeve17.80 mm~18.15 mm8.3 InstallationTightening torque for air chamber retainer bolts20 N•m▪ Attach the trip arm in a way that the valve switcher andpin fit in each groove on the trip arm. [Fig.8.5]▪ Use grease (alvania) to set the pins.

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