Hydraulic Impact Breaker
REGULATING A PIN VALVE
For these adjustments, be sure that the hammer pressure
is regulated as listed. Rapid Stage (psi) should be 1885
and Slow Stage (psi) should be 2175.
Widening the opening of the valve (removing shims)
makes the breaker more powerful but reduces its speed.
Narrowing the opening of the valve (oil passage)
increases the breaker speed, but makes the blows less
Add or remove adjustment shims in the same ways for the
cylindrical valve to adjust speed/power.
In a pin valve, the pressure varies with the movement of
the shims. There are 12 shims. The total number in the
breaker must NEVER be less than this number. To speed
up the breaker (decrease power), remove shims from the
"B" side and put them in the "A" side, leaving the total
number of shims at 12. To slow down the breaker
(increase power), move shims from the "A" side to the "B"