Nova-Tech LMI Series G - SG Metering Pump - Manual (Page 29)

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Pump still pumps even at zero capac-
ity setting • Improperly adjust micrometer knob. Readjust capacity
setting.
• Insufficient discharge pressure. Correct condition (e.g.,
install a back pressure valve).
Gear noise • Excessive backlash. Consult service facility.
• Worn bearings. Consult service facility.
• Wrong or insufficient lubricant. Replace or replenish lubri-
cant.
Loud knock with each stroke • Excessive gear set wear. Consult service facility.
• Worn bearings. Consult service facility.
Noisy operation in liquid end • Nosie in check valves. Ball checks move up and down
with some force. A distinct “clicking” noise is normal,
especially in metal piping systems.
SYMPTOMS REMEDIES