YAMADA NDP-P50, Maintenance Manual, Page: 8 / 14

5
5.2 Inspection
▪ Diaphragm
If the diaphragm is worn out or damaged, replace it.
Never replace just one diaphragm.
▪ Center rod [Fig.5.5]
Measure the diameter, and if it is outside the usable range,
replace the rod.
Usable range of center rod
Ø
24.93 -
Ø
25.00 mm
5.3 Installation
■
B
□
C, B
□
N, B
□
E, B
□
V, B
□
H, B
□
S, B
□
H/T types
For installation, see [Exploded View] on the separate sheet and install in the reverse order of
disassembly.
▪ Apply assembly grease to the center rod, and insert it into
the main body.
▪ Insert the cushion.
▪ Keep the marking “OUTSIDE” to liquid end for CR, NBR,
EPDM, FKM diaphragms. Keep the convex side to the
outside for TPEE, TPO diaphragms.
▪ Apply threadlocker to center rod and tighten the center disk
by the PP wrench (special tool, part number 771868).
Tightening torque for center rod
50 N•m
Fig.5.6
Fig.5.5