YAMADA NDP-P50, Maintenance Manual, Page: 9 / 14

6
▪
Draw the center disk to one side (exclude B □ H, B □ S,
B
□
H/T type cf.Fig.5.6).
▪
And install the out chamber. Tighten the bolts temporarily.
▪
Grip the inside center disk using crowbars and draw it to the
opposite side, then turn the diaphragm over.
(exclude B
□
H, B
□
S, B
□
H/T type) [Fig.5.7, 5.8]
▪
And install the out chamber. Tighten the bolts temporarily.
▪
After installation of the out chambers on both sides, place
the pump on a flat surface and stand the pump upright for
further assembly.
Tightening torque for out chamber.
35 N
•
m
<NOTE>
▪
Make sure there is no dust on the seal surface in order to
prevent seal damaged.
▪
Be careful not to damage the R portion and serrations of the
air chamber using a crowbar, etc.
▪
Tighten the bolts gradually in a diagonal sequence with even
torque. [Fig.5.9]
■
B
□
T type
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.
▪
Keep the convex side to the outside (cf. Fig.5.10).
▪
Put the O rings to both sides of the diaphragm. (cf. Fig.5.10)
▪
Apply thread locker 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
▪
Tighten the out chamber temporarily at first.
After installation of the out chambers on both sides, place
the pump on a flat surface and stand the pump upright for
further assembly.
Tightening torque for out chamber
35 N•m
<NOTE>
▪ Make sure there is no dust on the seal surface in order to
prevent seal damaged.
▪ Replace the PTFE O ring by new one.
▪ Tighten the bolts gradually in a diagonal sequence with even
torque. [Fig.5.11 ]
Fig.5.9
Fig.5.11
Fig.5.8
Fig.5.10
Fig.5.7