Type PS/80-1
4
f. Replace pad holder (key 29) and O-ring (key 32).
g. Reassemble by reversing above sequence.
General Maintenance
h. Proceed as directed in the replacement of filter,
stabilizer diaphragm and seal pad, and valve
seal pads.
i. Completely release spring
(key 5) by turning the
adjusting screw
(key 1) counterclockwise.
j. Remove screws
(key 10) and cover (key 6).
k. Keep plate
(key 8) blocked with a box wrench,
unscrew nut
(key 7).
△
CAUTION
This must be done exactly as described
to prevent damage to or breaking of
drilled needle valve (key 17).
l. Remove plate
(key 8) from stem (key 12), then
remove first diaphragm (key 9), diaphragm spacer
(key 81), second diaphragm (key 9), inlet plate
(key 79) and then slide off split pin (key 35).
m. Replace any worn seals.
Reassembly
Lubricate the static O-rings with a thin layer of
Molykote 55 M, be very careful not to damage the
O-rings when reassembling. No other pilot parts are to
be lubricated.
Reassemble parts by reversing the above steps. As
you proceed, make sure that parts move freely and
without friction.
In addition:
a. Once lever (key 36) and stem (key 12) have been
mounted, check that, with stem (key 12) against
body (key 19), clearance between forked stem
(key 31) and register (A) of lever (key 36) is 0.2 to
0.3 mm If not, use register to correct.
△
CAUTION
The above clearance can be checked by
gently pulling the stem (key 12) upward.
Use the proper tool to make sure that
support of diaphragm (key 9) on the
stem (key 12) is on the same plane as
that supporting the diaphragm (key 9) in
the body (key 19).
b. Mount diaphragm (key 9) and screw on plate
(key 8), first by hand then with box wrench, always
keep diaphragm (key 9) firmly in place to avoid
damage to stem (key 12) and underlying levers.
c. Holding plate (key 8) firmly in place with box
wrench, tighten nut (key 7).
d. Before remounting cover (key 6), center
diaphragm as follows: mark a reference point
(with pencil) on the diaphragm; turn it to the right
without forcing and mark another reference on
body. Now turn diaphragm to the left and mark a
further reference. Position the diaphragm mark
midway between the two marks on the body.
e. Tighten all screws uniformly to ensure
proper sealing.
△
CAUTION
The pilot has a wide range of self-
adjustment values. However, given
actual operating conditions, it may be
necessary to assist it at times by finding
the best setting of pin screw/register
(key 24) or the most suitable calibration
orifice (key 18).
