![Hitachi NR 90GC Technical Data And Service Manual Download Page 32](http://html.mh-extra.com/html/hitachi/nr-90gc/nr-90gc_technical-data-and-service-manual_143168032.webp)
--- 29 ---
O-ring (I.D. 66.27)
[36]
Apply oil entirely.
Oil application areas
Mount Sleeve
[9]
Apply oil entirely.
O-ring (I.D. 59.92)
[15]
Apply oil entirely.
Cylinder Head
[14]
Apply oil to the diagonally shaded
areas.
Outside: O-ring groove
Piston Ring
[38]
Apply oil entirely.
Chamber ass'y
Apply oil to the diagonally
shaded areas.
Inside: O-ring sliding portions
(2 places)
Fig. 21
Cylinder Ass'y
[42]
Apply oil to the diagonally
shaded areas.
Inside
Outside: O-ring groove
Piston
[39]
Apply oil to the diagonally
shaded areas.
Outside: Piston ring groove