Hitachi NV 90HMC, Technical Data And Service Manual

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O-Ring [21]
Protector [3]
Upper Cover [5]
Head Bumper [6]
Packing (B) [8]
Plate [9]
Piston O-Ring [10]
Piston (H) [11]
Muffler (A) [13]
Muffler [14]
Exhaust Cover [15]
Sleeve Valve
Rubber
[18]
Sleeve Valve [19]
O-Ring [20]
O-Ring [16]
Exhaust
Rubber [22]
Valve Plate [24]
O-Ring (S-32) [25]
Cylinder [36]
O-Ring (S-36) [37]
Cylinder
Ring [40]
Cylinder Plate [38]
Body Ass'y [42]
O-Ring (B) [39]
Head Guide [7]
Packing (B) [8]
Sleeve Valve
Spring [23]
Seal Lock Hex.Socket Flat
Hd. Bolt M5 x 10 [1]
Washer [2]
O-Ring (I.D 48.5) [12]
Nylock Bolt
M5 x 65 [4]
Gasket (C) [17]
1. Disassembly and reassembly of the
Upper Cover
,
Exhaust Cover
,
Piston (H)
,
cylinder
ass’y
etc
[Tools required]
• Hex. bar wrench (4 mm)
• Phillips screwdriver
• Flat-blade screwdriver
(1) Disassembly
• Loosen the Seal Lock
Hex.Socket Flat Hd. Bolt
M5 x 10
[1] and then
remove the Protector [3] .
• Loosen the four Nylock Bolt
M5 x 65 [4] and then
remove the Upper Cover [5] .
You can then detach the
components of the output
section (Exhaust Cover
[15] ,
Cylinder [36] , Piston (H)
[11] , and Cylinder Plate
[38] ).
• To remove the Exhaust
Cover [15] , first press the
Sleeve Valve [19] against
the Body Ass'y [42] and
detach the Sleeve Valve
[19] from the nailer body.
• When removing the Valve
Plate [24] , be sure to first
remove the Exhaust
Rubber
[22] .
• Insert the tip of a precision
screwdriver or other
sharp-pointed rod into the
gap between components
when disassembling the
Head Bumper
[6] , Sleeve
Valve Rubber [18] ,
Exhaust Rubber [22] and
Cylinder Ring [40] for
easier removal. However,
be careful not to damage
the mating components.
(2) Reassembly
Conduct reassembly by reversing the disassembly procedure, but note the following:
• Apply grease to the inner surfaces of the Piston O-Ring [10] and Cylinder [36] prior to reassembly.
• Apply grease to the O-Ring (I.D 48.5) [12] , O-Ring [16] , O-Ring [20] , O-Ring [21] , O-Ring (S-32) [25]
and O-Ring (S-36) [37] prior to reassembly.
• Apply grease to the outer surface of the Exhaust Rubber [22] and inner surface of the Sleeve Valve [19]
prior to reassembly.
Disassembly and Reassembly of the Output Section