Disassembly And Reassembly Of The Control Valve Section - Hitachi NV 83A2 Technical Data And Service Manual

10-3. Disassembly and Reassembly of the Control Valve Section

Tool required:
Roll pin puller (3 mm (0.118") dia.)
Minus-hd. screwdriver
(a) Disassembly (See Fig. 12.)
Remove the Magazine [81] as described in section 10-4.
Remove the Pushing Lever [54] as described in section 10-5.
With the roll pin puller (3 mm (0.118") dia.), take out the Roll Pin D3 x 30 [63], and remove the Trigger
[62], Trigger Plunger [68] and Safety Plunger (B) [61].
Insert the minus-hd. screwdriver into the groove of the Trigger Valve Bushing [67], and loosen it by
turning it to the left, being careful not to damage the groove.
After removing the Trigger Valve Bushing [67], pull down srongly on the Valve Bushing [60] to remove the
Valve Bushing [60], Plunger (A) [57] and the Plunger Spring [56].
(b) Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
Be very careful in handling the Plunger Spring [56],
as it can become twisted very easily.
To prevent the two O-rings on the outside of the
Valve Bushing [60] from being damaged when
inserted into the body, carefully apply grease to the
body hole and the outer circumference of the O-rings
prior to assembly.
(c) Adjustment of the Pushing Lever [54] (See Fig. 13.)
The Pushing Lever [54] can be adjusted by loosening
the Nut M5 [55] and turning the Safety Bolt [51].
Perform adjustment to a point where the resistance
of Safety Plunger (B) [61] pushing up Plunger (A)
[57] is felt when the pushing lever is raised. At this
point, the lower end of the Tail Cover [31] should be
separated from the lower end of the pushing lever by
6.5 mm 0.5 mm (.256"
Plunger Spring [56]
Plunger (A) [57]
Valve Bushing [60]
Trigger [62]
Safety Plunger (B) [61]
.020").
Valve Plate [66]
Trigger Valve Bushing [67]
Trigger Plunger [68]
Roll Pin D3 x 30 [63]
Fig. 12 Disassembly of valve
Plunger (A) [57]
Safety Plunger
(B) [61]
Tail Cover [31]
Fig. 13 Pushing lever adjustment
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Safety Bolt [51]
Nut M5 [55]
Pushing Lever [54]