Hitachi NV 50AG2, Technical Data And Service Manual

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Next, align the 4.5 mm dia. holes (2 places) of
Cylinder Washer (A) [14] with the matching 4 mm
dia. bosses (2 pcs.) of the Cylinder Packing [13] ,
and assemble them while confirming that they fit
properly into the groove of the Cylinder [16] . Also,
position the assembled Cylinder [16] by positioning
the curved portion of Cylinder Washer (A) [14]
between the ribs of the Body Ass'y [20] . (See Figs.
11 and 12.)
Mount Bumper (A) [11] to the Piston Ring [9] at the
driver blade side (lower) (Fig. 13).
Reassembly of Head Valve (A) [8] is easier if it is
pushed into the Exhaust Cover [4] together with the
Head Valve Spring [6] . Prior to reassembly,
liberally apply grease to the head valve sliding
portion
A
of the Exhaust Cover [4] and rib portions
B
and
C
of Head Valve (A) [8] , and insert grease
(approx. 0.5 g) into the grooved portion of the
Exhaust Cover [4] . (See Fig. 14.)
Piston [12]
Piston Ring [9]
Fig. 13
Driver blade
Exhasut cover
grooved portion
Bumper (A) [11]
Fig. 14
Head Valve (A) [8]
Top Cover [1]
Exhaust Cover [4]
During reassembly, apply oil (Shell Tonna S32 is recommended) to the inner portion of the Cylinder [16] .
When assembling Gasket (A) [5] , ensure that its hole is properly aligned with the air hole on the Body Ass'y
[20] .
During reassembly, liberally apply grease to the seal surface and the O-ring (P-32) [15] .