Download DH 38MS

C. Grease replacement procedures
The hammering section and gear change section use different types of grease. There is no need to
replenish the grease unless disassembling the tool for repair or in case grease is leaking due to a damaged
seal.
Special grease is used for the hammering section. After disassembling the hammering section (inside the
cylinder case and crankcase), carefully wipe the old grease off the parts and fill the cylinder case and
crankcase (on the connecting rod side) with 50 g of grease. Be careful not to overfill the grease as an
excessive amount of grease can cause hammering failure.
The gear change section (inside the gear cover) uses Hitachi Motor Grease No. 29. The proper amount of
grease is 30 g. Never use this special grease for the hammering section in the gear change section.
Otherwise, the special grease will leak into the motor section and subsequently cause trouble. Periodically
change the grease in the slip clutch. Fully fill the slip clutch with Hitachi Motor Grease No. 29.
REFERENCE MATERIALS
Refer to the Technical Data and Service Manual for the model indicated below.
1. Torque transmission
2. Striking operation
3. Mechanism to prevent idle hammering
4. Slip clutch mechanism
5. Tool holder
6. Sealing and dust-proof structure
7. Switching between “Rotation + Hammering”, “Neutral” and “Hammering only”
DH 40MR / List No. E467
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