Replacement Of Check Valve (2-Yearly); Removing The Enclosure Panels - Hitachi NEXT Series Instruction Manual

Oil-free rotary screw air compressor
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Replacement of Check Valve (2-Yearly)

11
Air-Cooled
Duct plate (1)
Duct plate (4)
Air-Cooled
Upper check valve cover
2 stage
packing (1)
Lower check
valve cover
Water-Cooled
9. MAINTENANCE [How to Service the Air Compressor]
Check valve assembly
Partition
plate (A)
Partition plate (B)
Flow
direction
(direction
of arrow)
Gasket
Check
valve
Gasket
Flow direction
(direction of arrow)
Check valve
cover
Gasket
Check valve
Gasket
Cooler header
Depressurizing the System
Depressurize the compressed air in the air compressor
as described in 9.4
.
2
2

Removing the Enclosure Panels

① Remove the front door and enclosure panels.
Air-Cooled
② Remove cooler ducts such as duct plate (1) and duct
plate (4).
3
Disassembly
① Remove the fastening bolts of the check valve cover.
② Remove the upper check valve cover for Air-Cooled
(check valve cover for Water-Cooled), gasket, check
valve, and gasket in this order.
③ Be careful of the mounting direction of the check
valve.
4
Cleaning and Inspection
Air-Cooled
① Clean the check valve mounting surfaces on the
upper and lower check valve covers so that the
surfaces are free from rust and fragmented gasket.
Water-Cooled
② Clean the check valve mounting surfaces on the
check valve cover and cooler header so that the
surfaces are free from rust and fragmented gasket.
89

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