9. STANDARD ADJUSTMENTS
RH-9820
114
9-30. Adjusting the throttle valves
Adjust the throttle valves of each valve as follows.
9-30-1. Adjusting the throttle valve of the cutter valve
016'
Function of the throttle valve of the cutter valve
The air released from the cutter cylinder when the hammer is raised is used as the air which flows to the venturi tube in order
to collect the cutting scraps. You can adjust the amount of this air that is released by adjusting the throttle valve of the cutter
valve. As a result of this, increasing or decreasing the opening amount of the throttle valve will change the cutting scrap
collection performance and also the hammer lifting speed (cycle time). Make the adjustment correctly by following the
procedure below.
<Adjustment method>
1. Loosen the fixing nut (1).
2. Loosen the throttle valve adjusting screw (2) by eight turns
from the fully-tightened position.
3. After adjusting, tighten the fixing nut (1) to secure the
throttle valve adjusting screw (2) so that it cannot turn.
* If the throttle valve adjusting screw (2) is not adjusted correctly, the following problems will occur.
No. of turns
of throttle valve adjusting screw (2)
Problem
If loosened by more than eight turns
The amount of air flowing to the venturi tube will be reduced, and so the
cutting scrap collection performance will drop. (If it is loosened too far,
cutting scrap blockages will occur. )
If loosened by less than eight turns
The amount of air flowing to the venturi tube will increase, and so the
cutting scrap collection performance will increase, but the hammer
lifting speed will decrease. (The cycle time will become longer and
working efficiency will drop. )
Note:
The hammer lifting speed will tend to become too slow after about six
turns. If you would like to give the highest priority to cutting scrap
collection performance, adjust to within a range of 6 to 8 turns while
continually checking hammer operation.
1607B
Loosen Tighten
