MMD Equipment 185S-6C2 - Manual (Page 49)

5.Periodic Inspection/Maintenance
5-16
A100372-1
5.5.24 Check o-ring and needle valve of auto-relief valve and vacuum relief valve
[3,000 hours or every 3 years]
 Disassemble and clean the component,
and check O-ring“1”, “ 2”, “ 3”and needle
valve“4”. Then, replace O-ring“1”,
“
2”,“3” and rubber on the needle
valve“4”, if hardened.
(For part number, see 5.4)
5.5.25 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.
<Procedure>
① When closing stop valve and fully opening service
valve while the machine is running, make sure that
the discharge pressure gauge shows the figure
between 49 to 68psi(3.4 to 4.7 bar).
② When the pressure is lower than 49psi(3.4 bar), replace
spring“3”with a new one. (For part number, see 5.4)
③ When the indicator shows excessively higher
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.
1
2
3
4
A070339
1
2
4
Auto-relief valve
Vacuum relief valve
3
1
2
4
3