Maintenance Of Oil Mist Remover - Hitachi NEXT Series Service Manual

4.12 Maintenance of Oil Mist Remover

1. Replacement of remover element
① Remove the pipe provided at the top of the remover
if required. Then remove 4 set screws (A) from the
oil mist remover housing.
Pull up the upper part of the housing.
② L oosen nut (B) and remove the cover. Now you can
remove the remover element.
③ I nstall a new element. Carefully seat the upper and
lower r ubber gaskets on the element without
allowing any gaps.
④ A fter replacement
of element, grease
the O-ring, replace
the housing, and
tighten set screws
(A) diagonally and
evenly.
(A)
2. Maintenance of Filter Regulator
① T urn the cover to remove. Remove the baffle and
replace the filter element with a new one.
② R emove the upper 4 set screws and remove the
upper part of the regulator. Replace the diaphragm
and the valve stem with new components. Be careful
not to install the new diaphragm upside down.
Diaphragm
OUT
Valve
(B)
Cover
Rubber packing
Remover
element
O-ring
Rubber packing
Screw (4 pcs)
Stem
IN
Regulator
O-ring
Filter element
Cover
Baffle
30
3. Maintenance of Relief Valve (See Fig. A.)
① T urn the nut at the top of the relief valve and remove
the plate. Replace the sheet and the spring with new
components.
② E nsure that the spring is positioned at the center
before assembly.
4. Maintenance of Vacuum Indicator (See Fig. B.)
① C ontamination of the vacuum indicator may cause
malfunction of indicator.
Remove and clean the indicator at least ever y six
months. In addition, replace the indicator once a year.
② Pull down the indicator while pushing up the locked
pipe joint at the top.
Spring
Nut
Plate
Valve seat
Fig. A
5. Maintenance of Ejector
① If the ejector is dirty, performance may decrease.
Disassemble and clean at least once a year.
② The maintenance procedure is as follows:
(1) Disconnect the control air tube at its detachable
connection.
(2) Loosen nut A (the nut can be tur ned
independently from the ejector body) and
disconnect the ejector from the manifold.
(3) Remove the plastic case.
(4) Clean the ejector body with a neutral detergent
and dry it with an air nozzle. Assemble all of the
parts.
Nut A
Locked joint
Pull
Fig. B