Reference Material - Hitachi DH 24PD2 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 50 g (1.8 oz) of
new grease into the gear cover and 10 g (0.4 oz) into the groove of the inner cover. Be careful not to exceed the
designated amount of grease. Excessive grease will reduce striking efficiency. Apply Molub Alloy No. 777-1
grease to the outer circumference of the clutch groove and the pin portion of the change lever.
8-2. Dust Collection Mechanism
As illustrated in Fig. 3, the Model DH 24PD2 is provided with a dust fan chamber, consisting of casing (A) and
casing (B), located between the gear cover and housing. Dust is drawn in from the nozzle of the dust
collection adapter ass'y by the suction provided by the dust fan mounted inside the dust fan chamber, and is
deposited in the dust bag. The dust shaft on which the dust fan is mounted, is connected to the armature shaft
by a spline, and rotates at the same speed as the armature.
The dust collection adapter ass'y is designed to be mounted on the side handle. As illustrated in Fig. 4, a
spring inside pipe (B) allows movement of pipe (A) so that the drill bit stroke (drilling depth) can be adjusted by
simply changing the position of a stopper mounted on pipe (A), thus functioning as a depth gauge. Also, a
rubber cap and a nozzle seal are provided to minimize leakage of dust where the drill bit rotates inside the
nozzle.
Gear cover
Dust fan
Dust shaft
Casing (B)
Outlet
Fig. 3
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Dust fan chamber
Casing (A)
Spline portion
Dust bag
Housing
Armature shaft