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ADJUSTMENT OF ADJUSTER
NOTICE
In fact, adjustment is necessary only when the breaker is mounted on a base machine
which is out of the applicable base machine range. Avoid unnecessary adjustment.
Adjust the adjuster while the breaker is in the stop condition.
When exceeding the adjustment range of the adjuster, the hydraulic oil may leak. It is
dangerous. (Refer to the maximum rotation adjustment range as shown below.)
• The valve adjuster adjusts the oil consumption of the breaker. The number of blows and oil
consumption are increased by opening the valve adjuster counterclockwise, and decreased by
closing it.
Table 1. Adjuster adjustment range
Model Hydraulic oil
pressure
(MPa)
Oil consumption
(lit./min)
Valve adjuster
position rev
(standard)
Maximum rotation adjustment
range of valve adjuster
F1 12~20 1/2
F2 16~30 1~2
F3 25~40 1/2~3/4
F4 32~48 1~2
F5
13.7
42~62 1~2
3 turns
Note: The adjuster position in Table 1 is standard. The adjuster is set most properly in factory and
then delivered. Therefore the adjuster position may be different from those in Table 1.
• If the adjuster function is not necessary, exchange the valve adjuster for the GPF plug stored in the
tool box.
• When the GPF plug is installed, the operation is within the maximum rotation adjustment (3 turns)
range and the oil quantity and number of blows are at the highest values.
Model Part No. Part Name
F1~F5 084891-01000 GPF plug
Open
Close
Valve adjuster
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