AirMan PDS400S-6C3, Service Manual

Page: 28 / 102

2. Maintenance
2-8
2.4 Maintenance and Adjustment of Pressure Control Valve
(1) Procedure of maintenance
In case that the discharge air pressure becomes lower than 51psi (0.35MPa) [3.5bar], it is necessary
to adjust the pressure of the pressure control valve according to the following procedures.
As it is possible that the O-ring has deteriorated or hardened, replace the O-ring even if the
replacement cycle has not yet been reached.
<Procedure>
①
Remove the pressure control valve cover
“
1
”
(opposite
side 65mm), and remove spring seat
“
2
”
. Then
change the spring
“
3
”
.
②
After installing the spring seat
“
2
”
, assemble the
cover
“
1
”
(opposite side 65mm).
③
After assembling, operate it to check and confirm
that there is nothing abnormal.
Before assembling, coat the threaded portion (C
portion) of spring seat
“
2
”
and of cover
“
1
”
with
lithium based all-purpose grease for prevention of
falling of spring seat and for prevention of thread
galling.
: 65 mm
< Inspection procedures of piston, valve, ring and O-ring >
When the pressure is low even after the spring is replaced, disassemble and inspect it, in the
following procedures.
①
After checking and confirming that compressed air is
completely emptied, remove he cover
“
1
”
and then
remove the spring
“
3
”
.
②
After removing the cover
“
4
”
(opposite side 65mm),
and piston
“
5
”
and valve
“
6
”
, check the ring
“
7
”
and O-ring
“
8
”
for any hardness and any damages. If
piston
“
5
”
and valve
“
6
”
are found worn, replace them.
③
Coat the sliding surface (A portion) of valve
“
6
”
with
compressor oil.
④
Coat the sliding surface (B portion) of piston
“
5
”
with
grease.
⑤
Prevent the threaded portion (C portion) from galling
by coating the threaded portion with grease.
⑥
Coat ring
“
7
”
and O-ring
“
8
”
with grease.
⑦
Coat both sides of spring seat
“
2
”
with grease so that
it cannot fall when assembling.
⑧
Re-assemble the pressure control valve in reverse
order to disassembly.
⑨
After having assembled, operate to check and
confirm that the set pressure is 0.4+0.10/-0.05MPa.
PC13058
PC13059
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