Unibloc-Pump UNIBLOC-PD 501, Operation & Service Manual

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20 UNIBLOC-PD Operation & Service Manual: PD501-576
6.1 Setting the Relief Valve Cover
6.1.1 Setting Relief Valve Cover: P/N 3237
Unscrew the housing (10) to reveal the adjusting mechanism. Release the lock ring (15) and turn it and the adjusting sleeve/spring
adjuster (16) clockwise until they bottom out. Turn the sleeve/adjuster counterclockwise until the pressure gauge begins to drop.
Lock this position with the lock ring (15). Keep in mind that this pressure must be approximately 0.3-0.7 bar (5-10 psig) lower
than the desired relief pressure, since the pump will continue to build pressure even though the valve may be open. Return the
housing (10) and tighten.
6.1.2 Setting Relief Valve Cover: P/N 3239B
Release the lock ring (8) and turn it and the adjusting sleeve/spring adjuster (7) clockwise until they bottom out. Turn the sleeve/
adjuster counterclockwise until the pressure gauge begins to drop. Lock this position with the lock ring (8). Keep in mind that
this pressure must be approximately 0.3-0.7 bar (5-10 psig) lower than the desired relief pressure, since the pump will continue to
build pressure even though the valve may be open.
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