SERVICE TRAINING
Service Manual
10
Rock Valve
Inlet Housing Lining
Cutting Ring
Cutting Ring
A
Rock Valve
Rock Valve
Pressure Spring
Pressure Spring
Tension Nut
Keeper Bolt
Pressure Spring
If the Pressure Spring has to be replaced, dis-
mantle the old spring and clean the vacant area
thoroughly to clear it of cement dust, etc. If dust
and residue are ignored, the new spring cannot
be installed correctly, and the flow of concrete
can pull it out of the groove. Furthermore, the
high pretension leads to premature wear of the
Cutting Ring and Housing Lining.
NOTE: Slightly
grease the new Pressure
Spring when installing it. The same applies to
the Kidney Seal. Do not use too much grease,
because grease accumulating in the spring
chamber operates as a spacer, and the conse-
quently increased spring pretension can lead
to the same damages as described above.
Tension Nut
Do not use the Tension Nut to adjust the position
of the Cutting Ring. Excessive wear of the Inlet
Housing Lining, Cutting Ring, Pressure Spring,
and Kidney Seal would result.
The Tension Nut adjusts the Kidney Seal area of
the Rock Valve ONLY. To check or adjust,
remove the Keeper Bolt will line up with a
threaded hole in the Setting Disc. If you are
between two holes, loosen the Tension Nut so it
lines up with the previous hole. Do not
use a
wrench to tighten. The flat sides of the Tension
Nut are to loosen the nut only
. Please call the
Schwing Service Department if you have any
questions.
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