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Replacing carbon brushes: (For parts name, refer to Fig. 1)

Loosen the two set screws and remove the tail cover. Remove the brush caps and carbon brushes. After replacing the carbon brushes, tighten the brush caps

securely and to install the tail cover with securely tightening two set screws.

5.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.

Grease replacement period

You should look at the grease when you change the carbon brush. (See item 4 in the section MAINTENANCE AND INSPECTION.) Ask for grease replacement at the nearest HITACHI Authorized Service Center. Proceed for replacement of grease.

Grease replenishment

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

(1)Disassemble the crank cover and thoroughly wipe off the old grease inside. (FIg. 21)

(2)Supply 30g (the standard volume to cover the connecting rod) of Hitachi Electric Hammer Grease A in the crank case.

(3)After replacing the grease, reassemble the crank cover securely. At this time, do not damage or lose the oil seal.

NOTE: The HITACHI Electric Hammer Grease A is of the lower viscosity type. When the supplied grease tube is consumed, purchase from a HITACHI Autorized Service Center.

Crank Case Cover

Fig. 21

6.Service and repairs

All quality power tools will eventually require servicing or replacement of parts because of wear from normal use. To assure that only authorized replacement parts will be used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER, ONLY.

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Hitachi DH 30PC, DH 30PB instruction manual How to replase grease, Service and repairs