Technical data

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(2) Disassembly and reassembly of Piston Bumper (B) [29], Feeder Set [35], Feed Piston [70] and other parts
(See Fig. 24.)
Tools required:
Flat-blade screwdriver
Hexagon bar wrench (4 mm, 6 mm)
Roll pin puller (3 mm (0.118") dia.)
(a) Disassembly (See Fig. 17.)
Remove the two Seal Lock Hex. Socket Hd. Bolts M5 x 10 [76] from the Tail Cover [31]. The Feed
Piston Cover [75], Feed Piston Cover (A) [74], Feed Spring [72] and Bumper [73] can then be removed.
Next, pry the Feeder Shaft Ring [32] off the Feeder Shaft [36] with a Phillips screwdriver, and
disassemble the Feeder Shaft [36], Feeder Set [35] and Feeder Spring [33].
Finally, pull the Feed Piston [70] out of the Tail Cover [31].
(b) Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
Fit the chamfered side of the Feeder Shaft Ring [32] to the side of the Feeder Shaft [36], and confirm that
the feeder shaft ring is inserted properly into the groove of the Feeder Shaft [36].
Apply grease (Hitachi Motor Grease No. 29, Code No. 930035, is recommended) to the contacting
portions of the Feeder Spring [33] and Feed Piston [70].
Confirm that the hook portions (two places) of the Feeder Spring [33] are properly fitted into the grooves
provided in the Feeder Set [35].
Prior to reassembly, apply grease (Hitachi Motor Grease No. 29, Code No. 930035, is recommended) to
O-ring (P-9) [69], O-ring (P-22) [71], O-ring sliding portions of the Feed Piston [70] and Tail Cover [31].
However, be careful not to apply excessive amount of greases. Excessive grease may interfere with the
proper movement of the Feed Piston [70] (movement of the Feed Piston would be sluggish when lower
pressure is applied).
Tighten the two Seal Lock Hex. Socket Hd. Bolts M5 x 10 [76] with the hexagon bar wrench (4 mm).
(3) Disassembly and reassembly of Adjuster [39] (See Fig. 17.)
Tools require:
Flat-blade screwdriver
Roll pin puller (2.5 mm (0.098") dia.)
(a) Disassembly
Remove Ratchet Spring (A) [40] using a flat-blade screwdriver. Then the Adjuster [39] and the Adjuster
Bolt [38] can be removed.
Remove the Roll Pin D2.5 x 18 [41] using the roll pin puller. Then the Adjuster [39] and the Adjuster Bolt
[38] can be removed.
(b) Reassembly
Disassembly procedures should be followered in the reverse order. Note the following points.
Connect the Adjuster [39] and the Adjuster Bolt [38] with the Roll Pin D2.5 x 18 [41] and screw it in the
Tail Cover [31] as far as it will go. Then insert Ratchet Spring (A) [40].