8
6. Throat bearing and Pilot valve Assembly
6.1 Removal
▪
Remove the diaphragm and center rod (see [5.1 Removal]).
▪
Remove the 8 retainer bolts from the air chamber, and
remove the air chamber and gasket. [Fig.6.1]
▪
Draw out the pilot valve assembly. [Fig.6.2]
▪
Draw out the throat bearing. [Fig.6.2]
▪
Remove the packing from the throat bearing. [Fig.6.3]
6.2 Inspection
▪
Throat bearing [Fig.6.4]
Measure the inside diameter, and if it is outside the usable
range, replace the throat bearing.
Usable range of throat bearing
Ø
18.03 ~
Ø
18.14 mm
▪
O rings, Packing
If the O ring is worn out or cracked, replace it.
▪
Pilot valve assembly
If the pilot valve is worn out or cracked, replace it.
6.3 Installation
For installation, see [Exploded View] on the separate sheet and install in the reverse order of disassembly.
Tightening torque for air chamber retainer bolts
18 N•m
<NOTE>
▪
Make sure there is no dust on the seal surface and the
seal is not damaged.
▪
Apply grease to packing.
