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9. MAINTENANCE [How to Service the Air Compressor]
Aftercooler side
Intercooler side
Ball valve
(1)
Ball valve (2)
Three-way change valve
Aftercooler side
Intercooler side
Ball valve
(1)
Ball valve (2)
Three-way change valve
Ⓔ
Ⓐ
Ⓑ
Ⓓ
Ⓒ
Ⓕ
■
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 ball valve (1) on the aftercooler side from
Ⓒ
to
Ⓓ
.
②
Check that ball valve (2) 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 solenoid valve (1)
or (2) is opened even slightly, strainer is still
pressurized.
④
If solenoid valve (2) 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 the ball valve (1) on the aftercooler side from
Ⓓ
to
Ⓒ
. Also check that ball valve (2) is
completely closed (
Ⓔ
side).
◆
Disassembly of strainer element during operation
◆
Valve conditions during normal operation
