Trebor 620R Magnum - Manual (Page 6)

PAGE 6 MAGNUM 620R PUMP OPERATION / MAINTENANCE MANUAL
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If none of the aforementioned conditions exist when operating the pump,
then the final setting of the check muffler may be used. To obtain maximum
flow capability and lowest start pressure (<10 psi), completely remove the
spring assembly from the check muffler assembly. This is the recommended
condition to obtain best performance and life from the pump. Most normal
open recirculation applications may be operated successfully under this
condition.
NOTE: Air consumption during “Dead Cycling” is very little since the pump
diaphragms are disp lacing only internal bypass. “Dead Cycling” should be
considered as a normal standby idle mode.
Figure 1-2: Check Muffler