Service Manual
17
Small Rock Valve
1.5 - .2.0mm
(.060 - .080")
A
Dimensions shown are with all new wear parts.
N
OTE: Check to make sure that the proper
clearance is obtained between the Rock Valve
and the Cutting Ring and between the Rock
Valve and the Kidney Plate. If the Rock com-
ponents are worn, the dimensions may be
larger that specified.
If the dimensions are too small, loosen the
Adjusting Nut and pry the Rock Valve in the
direction needed. Stroke the unit several
times, and recheck the dimensions. If the
dimensions are correct, reinstall the Tension
Nut and re-adjust.
IMPORTANT!
At no time should you operate
the Rock Valve without first lubricating the
outlet wear plate. Spraying the plate with water
or oil will usually be adequate prior to start-up
for pumping. Moving the kidney seal against a
dry plate will cause excessive wear and
premature failure.
Summary of Contents for SP ROCK
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