Hokuetsu AIRMAN PDS185S-6EZ1 Instruction Manual page 53

5. Periodic Inspection/Maintenance
5.5.27 Check consumable parts of vacuum-relief valve
3,000 hours or every 3 years
When replacing it, contact your nearest dealer because it requires expert technical knowledge.
5.5.28 Performance check of pressure control valve
3,000 hours or every 3 years

When reassembling, apply sufficient grease to O-ring Slot/O-ring and sliding surface. Use CALTEX
MULTIFAK EP1 grease or equivalent. Grease of poor quality will deteriorate the material.
5.5.29 Check O-ring and piston of pressure control valve
3,000 hours or every 3 years
After disassembling and cleaning pressure control valve, check O ring [A], [B] and piston [D]. When
the rubber of these parts is found hardened, or damaged, replace them.
When replacing it, contact your nearest dealer because it requires expert technical knowledge.
<Procedures>
1. When the service valve is fully opened during
A
B
2. When the pressure is lower than 58psi (4bar),
C
3. When the indicator shows excessively higher
D

A130986
operation, confirm that the pressure gauge on the
instrument panel indicates 58 psi (4 bar).
replace spring [C] with a new one.
(For part number, See 5.4)
pressure, you will find that the piston does not
move smoothly due to foreign material and rust
stuck inside valve. In such a case, disassemble the
component for checking and cleaning.
When replacing it, contact your nearest dealer
because it requires expert technical knowledge.
5-18
(For part number, See 5.4)