Hitachi DH 50MB User Manual

Page 18

English

NOTE: Use HITACHI carbon brush No. indicated in Fig. 21

⅜ Replacing carbon brushes:

(For parts name, refer to Fig. 20)
Loosen the tapping screws and remove the brush cap cover. Then, remove the
brush caps and take out the carbon brushes. After replacement, be sure to fasten
the brush caps and fix the brush cap cover firmly using the tapping screws.

6. How to replase grease

This machine is full air-tight construction to protect against dust and to prevent
lubricant leakage. Therefore, the machine can be used without lubrication for
long periods. Replace the grease as described below.

⅜ Grease replacement period

After purchase, replace grease after every 6 months of usage. Ask for grease
replacement at the nearest HITACHI Authorized Service Center. Proceed for
replacement of grease.

⅜ Grease replenishment

CAUTION: Before replenishing the grease, turn the power off and pull out the

power plug.

(1) Remove the crank case cover and wipe

off the grease inside.

(2) Apply 0.7 oz (20 g) of HITACHI Electric

Hammer Grease A (standard accessory,
contained in tube) to the crank case.
As the tube contains 1 oz (30 g) of
grease, supply 2/3 of the contained
grease.

(3) After replenishing the grease, install the

crank case securely.

Crank Case Cover

Fig. 22

Fig. 21

Wear limit

No. of carbon brush

0.26" (6.5 mm)

0.67" (17 mm)