Hitachi NEXT Series Service Manual page 40

Oil-free screw compressor
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4.16.2 Disassembling the Air Cylinder
③ Mark the matching position along the circumference
of the air cylinder.
④ Remove blowoff valve body (532) placed at the end
of the air cylinder.
⑤ Remove the inner bolt. After that, remove seal washer
(534), plate (508), valve sheet of blowoff valve piston
(507), and blowoff valve piston (506) in this order.
(506)
(507)
⑥ Mark the matching position and direction of the
valve and remove nut (530). Then remove spring
washer (529), unloader valve (574), spacer (542),
and unloader valve (514).
(514)
(542)
(529)
(574)
(530)
⑦ Remove nut (535), wave spring (536), and tie rod
(525). After that, remove air cylinder cover (526).
⑧ Remove seal packing (1) (515), air cylinder O-ring
(540) attached to the inner diameter of air cylinder
cover (526).
(526)
(515)
(540)
(532)
(508)
(534)
(525) (536)
(535)
Confidential to Customer
⑨ Remove the backup ring (F28), and pull out air
cylinder cover 1 (504), cover 2 (505) from both sides
of air cylinder tube (503). Then remove air cylinder
O-ring (520).
(F28)
(504)
⑩ Remove the snapring (F27), key (541), and pull out
spindle (509) from air cylinder tube (503). Then,
remove seal packing (3) (518) attached to piston (517).
⑪ Remove air cylinder piston gasket (537) from
spindle (509).
(509)
⑫ Remove seal packing (1) and (2) (515 and 516,
respectively), from the inner diameter of air cylinder
cover (504). After that, remove seal packing (4) and
(5) (519 and 521, respectively), rod metal (510),
O-ring (2) (540), and O-ring (1) (550) from the inner
diameter of air cylinder cover (504).
(516)
(515)
(504)
When removing the seal packing, be very careful
not to damage the piston or air cylinder cover.
38
(520)
(503)
(537)
(F27)
(518)
(517)
(504)
(540)
(510)
(519)
(521)
(550)
(520)
(505)
(541)

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