Reactive Force Control; Lubrication; Maintenance And Inspection - Hitachi DH 18DBL Handling Instructions Manual

REACTIVE FORCE CONTROL

This product is equipped with a Reactive Force Control
(RFC) feature that reduces jerking of the tool body.
If the tool bit is suddenly overburdened, any jerking of the
tool body is reduced by activation of the slip clutch or by
stopping of the motor by the sensor built into the tool body.
If the motor is stopped because of overburdening detection
by the controller, this is indicated by blinking of the remaining
battery lamp while the switch is pulled. (Fig. 28)
Because the RFC feature may not activate or its performance
may be insuffi cient depending on the working environment
and conditions, be careful not to suddenly overburden the
tool bit while operating.
● Possible causes of sudden overburdening
Tool bit biting into material
1
Impact against nails, metal or other hard objects
2
Tasks involving prying or any excess application of pressure, etc.
3
Also, other causes include any combination of the aforementioned.
● When the reactive force control (RFC) is triggered
When the RFC is triggered and the motor stops, turn off the tool's switch and remove the
cause of the overburdening before continuing operation.

LUBRICATION

Low viscosity grease is applied to this rotary hammer so that it can be used for a long period
without replacing the grease. Please contact the nearest service center for grease replacement
when any grease is leaking form loosened screw.
Further use of the rotary hammer despite the grease shortage causes damage to reduce the
service life.
CAUTION
A specifi c grease is used with this machine, therefore, the normal performance of
the machine may be badly aff ected by use of diff erent grease. Please be sure to let
one of our service centers to undertake replacement of the grease.

MAINTENANCE AND INSPECTION

CAUTION
Be sure to turned off the switch and remove the battery before maintenance and
inspection.
1. Inspecting the tool
Since use of as dull tool will degrade effi ciency and cause possible motor malfunction,
sharpen or replace the tool as soon as abrasion is noted.
43
English
Fig. 28