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SPECIAL INFORMATION
ROTATION
Viking Mag Drive pumps are designed to run in the direction
indicated on the nameplate only. If rotation must be reversed,
See "Changing Pump Rotation" on page 10.
PRESSURE RELIEF VALVES
1. Viking pumps are positive displacement pumps and must
be provided with some sort of pressure protection. This
may be a relief valve mounted directly on the pump, an
inline pressure relief valve, a torque limiting device or a
rupture disk. Do not rely on decoupling of magnets for
protection from over pressure; this may result in damage
to the magnets, pump, or other equipment.
2. Relief valves are mounted as standard on the head of GG,
HJ, and HL size pumps and on the casing of AS, AK, and
AL size pumps. Relief valves are not available on jacketed
heads (GG, HJ & HL).
3. If pump rotation is reversed during operation, pressure
protection must be provided on both sides of pump.
4. Relief valve adjusting screw cap must always point towards
suction side of pump. See "Figure 3" on page 3.
If pump rotation is reversed, remove pressure relief valve
and turn end for end. See "Changing Pump Rotation"
on page 10 for additional steps required for proper
operation.
5. Pressure relief valves cannot be used to control pump flow
or regulate discharge pressure.
For additional information on pressure relief valves, refer to
Appendix, General Installation Notes, item 5 on Pressure
Protection or contact your Viking Pump
Engineering Service Bulletin ESB-31.
FIGURE 3
Relief Valve
Adjusting
Screw Cap
Suction
© 2019 Viking Pump, Inc. • Cedar Falls, IA
representative for
®
Discharge
⚠
CAUTION !
Rare earth magnets used in couplings have extremely
strong magnetic fields capable of changing performance
or damaging items such as the following:
• Pacemakers
• Metal Implants
• Watches
• Computers
• Cellular or Mobile Devices
• Credit Cards
Completely assembled magnetic couplings will not affect
items listed above – only disassembled components.
There are no known harmful effects of these magnetic
fields on the human body.
MAINTENANCE
These pumps are designed for long, trouble-free service life
under a wide variety of application conditions with minimum
maintenance. The points listed below will help provide long
service life.
CLEANING PUMP
Keep pump as clean as possible. This will facilitate inspection,
adjustment and repair work.
STORAGE
If pump is to be stored, or not used for six months or more,
pump must be drained and a light coat of non-detergent SAE
30 weight oil must be applied to all internal pump parts.
Apply grease to pump or coupling shaft extension, if present
or accessible. Viking suggests rotating pump shaft by hand
one complete revolution every 30 days to circulate the oil.
The coupling should be stored in a dry area. Tighten all pump
assembly bolts before putting pump in service after being
stored.
Note: If the liquid to be pumped reacts with oil, use an
acceptable alternate.
SUGGESTED REPAIR TOOLS
The following tools must be available to properly repair these
pumps. These tools are in addition to standard mechanics' tools
such as open-end wrenches, pliers, screwdrivers, etc. Most of
the items can be obtained from an industrial supply house.
1. Soft headed hammer
2. Allen wrenches (for set screws)
3. Snap ring pliers
INTERNAL – Viking Part No. 2-810-047-999;
EXTERNAL – Viking Part No. 2-810-029-375;
4. Feeler gauge set
5. Brass or plastic bar
6. Arbor press
TSM 1743 | Issue A | Page 3 of 24
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