SERVICE TRAINING
Service Manual
29
Rock Valve
Setting Pivot Angles
After any repairs or dismantling, the pivot angles
must be checked and reset, if necessary.
1. The distance between the Pivot Pin and the
Cylinder Body must be approximately 185
mm(7 9/32”) with the cylinder fully
retracted.
2. To adjust the correct setting, loosen the Pis-
ton Rod Locknut and adjust as required.
NOTE: After approximately setting the Piston
Rod, check that the Rock Valve travels across
the Spectacle Plate, and ensure that the Cut-
ting Ring is centered over each port. When
stopped in the end position equally on both
sides.
3. To check the setting, fully unscrew the pres-
sure reducing valve and close the ball
cock.Then, move the pivot cylinder to the
end of its stroke.
4. In this position, check that the ports are com-
pletely covered by the cutting ring by look-
ing through the pipe bend (connection
piece). If they are not, make adjustments
using the Piston Rod.
5. After the setting is checked, tighten the lock-
nut onto the Piston Rod.
185 mm
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