Hitachi NV 83A2 Technical Data And Service Manual page 36

(1) Tail Cover [31], Pushing Lever [54] and the related parts (See Fig. 17.)
Tools required:
Hexagon bar wrench (6 mm)
Roll pin puller (3 mm (0.118") dia.)
Screwdriver
(a) Disassembly
Pull out the Roll Pin D3 x 45 [53]. Then Valve Guard [52] can be removed.
Remove the four Nylock Hex. Socket Hd. Bolts M8 x 22 [37]. Then Piston Bumper (B) [29], Gasket
(A) [30] and Pushing Lever [54] can be removed together with the Tail Cover [31].
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Safety Plunger (B) [61] is apt to come off during disassembly. Be sure to check that Safety Plunger (B)
[61] is securely mounted during reassembly.
Insert the protrusion of the Valve Guard [52] between the Roll Pin D3 x 30 [63] and Body (B) [27].
(See Fig. 18.)
Insert the Roll Pin D3 x 45 [53] in the hole of the Valve Guard [52] and the hole of Body (B) [27].
Protrusion of the Valve Guard [52]
Roll Pin D3 x 45 [53]
Body (B) [27]
Roll Pin D3 x 30 [63]
Pushing Lever [54]
Fig. 18
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Trigger [62]
Valve Guard [52]