9. MAINTENANCE [How to Service the Air Compressor]
83
Ⓔ
Ⓒ
Strainer
After cooler side
Intercooler side
Two-way valve A
Two-way valve B
Three-way change valve
◆
Disassembly of strainer element during operation
Air-Cooled
Water-Cooled
◆ Valve condition during normal operation
Ⓔ
Ⓒ
After cooler side
Intercooler side
Two-way valve A
Two-way valve B
Three-way change valve
Air-Cooled
ater-Cooled
After cooler side
Intercooler side
Two-way valve A
Two-way valve
Three-way change valve Ⅰ
Ⓔ
Ⓐ
Ⓑ
Ⓒ
Ⓕ
Ⓓ
Ⓔ
Ⓐ
Ⓑ
Ⓓ
Ⓒ
Ⓕ
After cooler side
Intercooler side
Two-way valve A
Two-way valve B
Three-way change valve Ⅰ
■ Cleaning the strainer element during
operation
If the strainer needs to be cleaned while the air
compressor is running, contact the local HITACHI
distributor/master dealer or representative office.
While the air compressor is running, strainer is
always pressurized. Be careful extremely to the
high pressure when the strainer is removed.
(1) Intercooler side
① Turn three-way change valve on the intercooler
side from Ⓐ to Ⓑ.
② Element is still pressurized depending on the
solenoid valve action, so be careful extremely
when opening the strainer plug. Remove the
strainer element.
③ Wash the element with water and blow air, and
reassemble it.
④ Turn three-way change valve from Ⓑ to Ⓐ.
(2) Aftercooler side
① Turn two-way valve A on the aftercooler side
from Ⓒ to Ⓓ.
② Check that two-way valve B is completely closed
(Ⓔ side). In this state, strainer pressure in the
solenoid valve is released by solenoid valve
action.
③ After verifying the compressed air is discharged,
remove the strainer element. If two-way valve A
or B is opened even slightly, strainer is still
pressurized.
④ If two-way valve B is opened to the Ⓕ side in this
state, condensate can be drained while cleaning
the strainer element.
⑤ Wash the element with water and blow air, and
reassemble it.
⑥ Turn two-way valve A on the aftercooler side
from Ⓓ to Ⓒ. Also check that two-way valve B is
completely closed (Ⓔ side).
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