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Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
6. Lift the hopper grate and secure with locking pin.
7. From inside the hopper, tap the cutting ring for-
ward, towards the spectacle plate. The ring should
come loose. (If it does not, loosen the cover bolts
a little more, then gently pry the Rock Valve rear-
wards a little more). Rotate the ring 90° clockwise
(Figure 13). It does not matter which way you ro-
tate, but to keep from forgetting which way you
went last time, we recommend going clockwise
each time.
Rotate the Cutting Ring 90˚ clockwise
Figure 13
Rotate the cutting ring
8. Center the cutting ring in the Rock Valve. Tighten
the cover bolts slightly, if needed, to be sure that
the ring is not crooked.
9. Tighten the cover bolts just enough to bring the
back plate up against the rock housing. Then
tighten each bolt equally, using a torque wrench.
Alternate which bolts you tighten, as you would
when tightening a wheel on a car. The torque
specs for these bolts (M20 x 65, 8.8 hardness) is
300 foot/lbs.
10. Tighten the tension nut according to the instruc-
tions in the “Check the Rock Valve tension nut”
procedure. Tighten the keeper bolt.
Lubricate mechanical moving parts
Lubricate mechanical moving parts with oil or a lubri-
cant such as WD-40. This applies to pins, hinges, valve
handles and other components.
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