Reference Material; Lubrication; Tool Structure - Hitachi DH 24PE (S) Technical Data And Service Manual

8.REFERENCE MATERIAL

8-1. Lubrication

It is not necessary to replenish the grease lubricant unless the tool is disassembled or there is grease leakage
due to a defective seal. Special grease is used in the striking section. Should the striking section (within the gear
cover) be disassembled, carefully remove the old grease from all parts and, on reassembly, inject 55 g (1.94 oz)
of new grease into the gear cover. Be careful not to exceed the designated amount of grease. Excessive grease
will reduce striking efficiency.

8-2. Tool Structure

• Transmission of rotation
Unlike conventional hammer drills, the armature shaft in the Model DH 24PE (S) is in parallel with the tool
shaft - the same structure that is employed in most impact drills. This structure was adopted in order to make
the Model DH 24PE (S) more compact for easier handling and operation. Thus, the appearance of the Model
DH 24PE (S) is similar to that of an impact drill. The rotation of the armature is transmitted to the second shaft
via the first gear, and causes it to rotate. The second pinion provided on the second shaft engages the second
gear mounted on the outer circumference of the cylinder. The cylinder is coupled to the second gear by
means of a slip mechanism, and they rotate together. The end of the cylinder also functions as the drill bit
retainer. The cylinder is key-connected to the inserted drill bit by means of two key rails, and transmits rotation
to the drill bit. A steel ball is used to prevent the bit from coming off.
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