Hitachi NV 65AF3 Technical Data And Service Manual page 37

Bent portion
(3) Disassembly and reassembly of Piston Bumper [25], Feeder [33], Feed Piston [79] and other parts (Fig. 29)
(a) Disassembly
Remove the Nose [27] and the parts forming the pushing lever from the output section in accordance with
the procedure in 2.5 (1). Then the Piston Bumper [25] can be removed.
Holding the Feed Piston Cover [82] with fingers, remove the Retaining Ring for D28 Hole [84] with a
retaining ring puller. Then the Feed Piston Cover [82], Bumper [81] and Feed Spring [80] can be removed.
Pull out the Roll Pin D4 x 16 [29] with a roll pin puller (4 mm dia.). Then the Feed Piston [79] and the
Feeder Arm [31] can be removed.
Push out the Needle Roller [30] with a roll pin puller (4 mm dia.). Then the Feeder Arm [31], Feeder [33]
and Feeder Spring [32] can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Before replacing the Piston Bumper [25], clean the passages of the Body [23] and the Nose [27] (Fig. 29)
and the inside of the feed piston chamber (Fig. 30). If clogged with fragments of the Piston Bumper [25],
the Feed Piston [79] will not work properly.
Piston Bumper [25]
Body [23]
Nose [27]
Fig. 29
Apply grease to O-ring (P-9) [77] and O-ring (P-21) [78].
Seal grease in the groove of the Feed Piston [79] (Fig. 30).
Adjuster [50]
Adjuster
Spring [52]
Bent portion
Fig.28
Feeder Arm [31]
Passage
O-ring (P-4)
[26]
Passage
O-ring (P-9) [77]
"A" surface
Feed piston chamber
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Adjuster Plate (B) [53]
Convex portion
Adjuster Plate (A) [54]
Roll Pin D4 x 16 [29]
Split
Groove
O-ring (P-21) [78]
Fig. 30
Retaining
Ring for D28
Hole [84]
Groove