Hitachi DH 40MRY Technical Data 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 five O-rings and three oil seals as shown in Fig. 10. This
prevents leakage of grease from the cases, while also protecting them against dust from outside. The tool
holder is also protected from foreign matter by means of the rubber front cap.
Oil seal
O-ring
Front cap
O-ring
Oil seal O-ring
Oil seal
O-ring
Fig. 10
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