Service Manual
13
Small Rock Valve
2
1
2
Spring installed
d
mm
M
Figure 1
Figure 2
Figure 3
Determining Wear on the Kidney
Seal & Housing Lining - Outlet
Side
Replace the kidney seal if any of the following
conditions exist:
•
A considerable formation of cracks are found
in the areas marked by arrows. This problem
is very rare.
•
The lip is completely worn to the point that
the pressure relief grooves are no longer
recognizable.
•
The distance indicated by “M” of the
released kidney seal does not exceed 30mm
(1.1875").
Replace the outlet housing lining (kidney plate)
only if scores deeper than 1.5mm are found in the
area that contacts the kidney seal. You can
measure this by placing a steel ruler across the
kidney plate in several places and using a depth
gauge to determine the gap.
NOTE: Outside of the area that contacts the
Kidney Seal, you may detect scores that are
due to aggregate particles stuck between the
Rock Valve and the Kidney Plate. (See fig. 2
and fig. 3) THESE SCORES DO NOT MAT-
TER IN THE LEAST!
Summary of Contents for SP ROCK
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