YAMADA DP-20F/P Maintenance Manual

Contents

YAMADA DP-20F/P Maintenance Manual Manual pdf 8 page image

5Fig.4.7Fig.4.8▪ Hold the diaphragm and turn the bushing in the direction ofthe arrow to separate it from the diaphragm. [Fig.4.6]4.2 Inspection▪ DiaphragmReplace the diaphragm if it is worn out or damaged.Always replace both diaphragms at the same time.Guideline of diaphragm life6 million cycles▪ Center rod [Fig.4.7]Measure the diameter, and if it is not within thepermissible range, replace the center rod.Permissible range of center rod diameterDP-20F/P Ø 17.92 - Ø 17.98 mmDP-25F/P, DP-25F/C Ø 23.92 - Ø 23.98 mmDP-38F/P, DP-38F/C Ø 29.87 - Ø 29.95 mm▪ Body [Fig.4.8]Measure the inside diameter, and if it is not within thepermissible range, replace the body.▪ Packing, WiperReplace the packing and wiper if they are worn out ordamaged.▪ BushingReplace the bushing if the thread is damaged.4.3 InstallationFor installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.▪ Soak the wipers in lubricant oil and fit them in the pump body.▪ Apply grease to the packings and fit them in the pump body.(Refer to P.11 instruction for applying lubrication)▪ Attach the bushings to the diaphragm securely.▪ Turn the diaphragm assembly with hands until it stops tocomplete the body assembly.Tightening torque for horizontal tie rodsDP-20F/P 9 N•mDP-25F/P, DP-25F/C 10 N•mDP-38F/P, DP-38F/C 15 N•mPermissible range of body dimensionDP-20F/P Ø 18.03 - Ø 18.11 mmDP-25F/P, DP-25F/C Ø 24.03 - Ø 24.11 mmDP-38F/P, DP-38F/C Ø 30.03 - Ø 30.10 mmFig.4.6Fig.4.9