-8-
Fig. 8 Ɣ Mounting the piston
Inner Cover [53] ass’y
Breathing groove of Piston [38]
Piston [38]
Striker [36]
O-ring D17 [37]
Air chamber
6. Mounting the piston
Mount the Piston [38] as shown in Fig. 8.
Apply the specified grease to the inner and outer circumferences of the Piston [38]. Also apply grease to
the inner and outer circumferences of the Piston Pin [39] and Piston Washer [40]. Mount the Piston
Washer [40] on the Piston [38] and then insert the Piston Pin [39].
Fill 20 grams of the specified grease into the cylinder of the Inner Cover [53] and then insert the Piston
[38] into the cylinder of the Inner Cover [53]. Insert the arm of the Reciprocating Bearing [47] of the
Second Shaft [41] assembly into the Piston Pin [39] so that the arm of the Reciprocating Bearing [47] is
sandwiched between the two Piston Washers [40] as shown in Fig. 9.
After inserting the arm, insert the spigot joint of the Bearing Holder [49] into the Inner Cover [53] with the
threaded portions of the Inner Cover [53] aligned with the holes of the Bearing Cover [50] and Bearing
Holder [49]. Here, orient the Bearing Holder [49] as shown in Fig. 10.
As shown in Fig. 11, one of the bolts touches the Reciprocating Bearing [47] and cannot be inserted
straight into the Inner Cover [53]. Therefore, tighten one bolt at a time, rotate the Reciprocating Bearing
[47] so that new Seal Lock Hex. Socket Hd. Bolt M5 x 16 [48] can be inserted straight in, and then fully
tighten the bolts.
After tightening the bolts, allow the Reciprocating Bearing [47] to make one rotation and confirm that the
Piston [38] makes one reciprocation. Pull the Piston [38] to confirm that it does not come off.
Pushing the Striker [36] into the Piston [38] compresses the air in the air chamber. The compressed air is
released when O-ring D17 [37] exceeds the breathing channel of the Piston [38]. Push in the Striker [36]
until O-ring D17 [37] exceeds the breathing channel of the Piston [38]. (Listen for the sound of air being
released when O-ring D17 [37] exceeds the breathing channel of the Piston [38].)
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