YAMADA G25, Maintenance Manual, Page: 7 / 12

4
5. Diaphragm and Center rod
5.1 Removal
▪ Remove the O ring, ball, valve seat (see “ 4.1 Removal”).
▪ Remove the 12 retainer bolts from the out chamber, and
remove the out chamber. [Fig.5.1]
▪ After the center disk on one side have been removed using
the spanner 22 mm etc., remove the center disk and
diaphragm. [Fig.5.2]
▪ Remove the center disk and center rod from the opposite side
of the main body.
▪ Remove the center disk on the opposite side using the double
nuts. [Fig.5.3]
▪ Remove the center disk and diaphragm.
5.2 Inspection
▪ Diaphragm
If the diaphragm is worn out or damaged, replace it.
Never replace just one diaphragm.
▪ Center rod [Fig.5.4]
Measure the diameter, and if it is outside the usable range,
replace the rod.
Usable range of center rod
φ
17.95 -
φ
18.00 mm
Fig.5.1
Fig.5.2
Fig.5.3
Fig.5.4