Hitachi DH 40MR Technical And Service Manual page 19

Handle and side handle
The handle section is of a two-layer structure. The base is made of glassfiber-reinforced plastic and the
outside layer is soft resin. They are molded in one piece.
The side handle also has a two-layer structure. The base is made of glassfiber-reinforced plastic base with a
steel nut and the outside layer is soft resin. They are molded in one piece. The newly designed handle and
side handle structure ensures more comfortable grip for improved operability.
Sealing and dust-proof structure
The cylinder crank case section is tightly sealed with three o-rings, three oil seals and rubber seal as shown in
Fig. 9. This prevents leakage of grease from the cases, while also protecting them against dust from outside.
The tool holder is also protected from foreign dust by means of a rubber front cap.
Rubber seal
Oil seal
O-ring
Front cap
O-ring
Oil seal
Oil seal
Fig. 9
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