MMD Equipment 185S-6C1 - Manual (Page 52)

5. Periodic Inspection/Maintenance
5-15
5.5.21 Check O-ring and Needle Valve of Auto-relief Valve and Vaccume
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.
(See 5.4)
5.5.22 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.
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 49-68psi
(3.4-4.7bar).
② When the pressure is lower than 49psi( 3.4 bar) ,
replace spring“3” with a new one. （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
A070338
1
2
3
4
A070339
1
2
3
4
1
2
3
4
Auto-relief valve
Vaccume relief valve