Viking Pump TSM141.2: LS-M 125/4125 - Manual (Page 2)

SECTION TSM 141.2 ISSUE F PAGE 2 OF 12
SPECIAL INfORMATION
MAINTENANCE
ROTATION: Viking pumps operate equally well in a clock-
wise or counterclockwise rotation. Shaft rotation determines
which port is suction and which is discharge. Port in area
where pumping elements (gear teeth) come out of mesh is
suction port.
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.
2. There are relief valve options available on those pump
models designed to accept a relief valve. Options may
include a return to tank relief valve and a jacketed relief
valve. Pumps equipped with a jacketed head plate are
generally not available with a relief valve.
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. If pump rotation is
reversed, remove pressure relief valve and turn end for
end. Refer to figures 1 and 2.
5. Pressure relief valves cannot be used to control pump
flow or regulate discharge pressure.
DANgER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
relief valve adjusting cap fitting, etc.)
Be sure:
1. That any pressure in the chamber has
been completely vented through the
suction or discharge lines or other
appropriate openings or connections.
2. That the driving means (motor,
turbine, engine, etc.) has been “locked
out” or made non-operational so that
it cannot be started while work is
being done on pump.
3. That you know what liquid the
pump has been handling and the
precautions necessary to safely
handle the liquid. Obtain a material
safety data sheet (MSDS) for the
liquid to be sure these precautions
are understood.
failure to follow above listed
precautionary measures may result in
serious injury or death.
For additional information on pressure relief valves, Refer
to Technical Service Manual TSM000 and Engineering
Service Bulletin ESB-31.
SPECIAL MECHANICAL SEALS
Extra care must be taken in repair of pumps with mechanical
seals. Read and follow all special information supplied with
pump.
Series 125 and 4125 pumps are designed for long, trouble-
free service life under a wide variety of application conditions
with a minimum of maintenance. The points listed below will
help provide long service life.
LUBRICATION: External lubrication must be applied slowly
with a hand gun to all lubrication fittings every 500 hours of
operation with multi-purpose grease, NLGI #2. Do not over-
grease. Applications involving very high or low temperatures
will require other types of lubrication. Refer to Engineering
Service Bulletin ESB-515. Consult factory with specific
lubrication questions.
PACKING ADJUSTMENT: New packed pumps require initial
packing adjustment to control leakage as packing “runs in”.
Make initial adjustments carefully and do not over-tighten
packing gland. After initial adjustment, inspection will reveal
need for packing gland adjustment or packing replacement.
Refer to instructions under Disassembly, page 4, and
Assembly, page 5, regarding repacking pump.
CLEANING PUMP: Keep pump as clean as possible. This
will facilitate inspection, adjustment and repair work and help
prevent overlooking a dirt covered grease fitting.
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. Lubricate fittings and apply grease to pump shaft
extension. Viking suggests rotating pump shaft by hand one
complete revolution every 30 days to circulate the oil.
SUGGESTED REPAIR TOOLS: The following tools must
be available to properly repair Series 125 and 4125 pumps.
These tools are in addition to standard mechanics’ tools such
as open end wrenches, pliers, screw drivers, etc. Most of the
items can be obtained from an industrial supply house.
1. Soft Headed hammer
2. AlIen wrenches (some mechanical seals and set collars)
3. Packing hooks, flexible (packed pumps)
Large for 0.38 inch and up cross section packing
4. Mechanical seal installation sleeve
Viking Part No. 2-751-005-630 for 2.44 inch seal;
Q, QS & M4125
5. Bearing locknut spanner wrench
6. Spanner wrench, adjustable pin type for use on double
end caps
7. Brass bar
8. Arbor press