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Liquiflo Installation, Operation & Maintenance Manual
1.5
General Operation
The successful and safe operation of a pump is not only dependent on the pump but also on each of the system
components. It is therefore important to monitor the entire pumping system during operation and to perform the
necessary maintenance to keep the system running smoothly.
A normally operating magnetic-drive gear pump will deliver a steady, pulse-less flow with no leakage, be relatively
quiet and have a predictable flow rate based on the pump speed, fluid viscosity and differential pressure across
the pump. Refer to the performance curves of the specific pump model being operated (see Liquiflo Product
Catalog or website: www.liquiflo.com).
If a significant problem is observed during operation, the pump should be stopped so that corrective action can
be taken. The observed problem could have several possible causes, and multiple remedies for each cause. For
help with problem solving, refer to the Troubleshooting Guide given in Appendix 7.
1.6
Maintenance & Repair
The pump has internal sleeve bearings, wear plates, gears and shafts which require replacement over time due
to physical wear. The center housing of the pump may also incur physical wear and require replacement (see
Appendix 3). O-rings and retaining rings should always be replaced when rebuilding the pump.
The main factors affecting the physical wear of the pump are operating speed, differential pressure, fluid viscosity,
duty cycle, starting and stopping frequency, abrasives in the fluid and the wear properties of the materials. These
factors can cause pump lifetimes to vary significantly from one application to another, making it difficult to predict
when the pump will require maintenance. Therefore, the maintenance schedule for the pump is typically based on
the maintenance history of the specific application. The main indicators that a pump may require maintenance
are the following: (1) decreased flow rate or pressure, (2) fluid leakage, (3) unusual noise or vibrations and (4)
increased power consumption.
Standard repair kits are available to facilitate repair of the pump (see Appendix 4). A repair kit includes all inter-
nal wear parts as well as O-rings, retaining rings, bearing lock pins, housing alignment pins and keys. The parts
not included in a mag-drive pump repair kit are the housings (front, center and rear), magnets (inner and outer),
containment can, pedestal and hardware (bolts, nuts and washers). Before performing maintenance on the pump,
review the safety precautions and follow the included instructions.
H&3-Series MAG-DRIVE Gear Pumps
Models H1F-H9F, 31F-39F & 311F
8
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