Viking Pump TSM211: F-G 724/4724 - Manual (Page 3)

SECTION TSM 211 ISSUE D PAGE 3 OF 8
SUGGESTED REPAIR TOOLS: The following tools must
be available to properly repair Series 724 and 4724 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. Allen wrenches (some mechanical seals and set collars)
3. Packing hooks, flexible
Small for 0.25 inch and 0.31 inch cross section packing
Large for 0.38 inch and up cross section packing
4. Mechanical seal installation sleeve
5. Bearing locknut spanner wrench (2-810-043-375)
6. Spanner wrench, adjustable pin type for use on double
end caps (2-810-008-375)
7. Brass bar
8. Arbor press
ROTATION: Viking pumps operate equally well in a clockwise
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, a
rupture disk, or other device.
2. There are relief valve options available on those pump
models designed to accept 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 figure 1, page 1 and figures 2 and 3,
page 3.
5. Pressure relief valves should not be used to control
pump flow or regulate discharge pressure.
For additional information on pressure relief valves, Refer
to Technical Service Manual TSM000 and Engineering
Service Bulletin ESB-31.
SPECIAL INfORMATION
MAINTENANCE
The small Stainless Steel series 724 and 4724 pumps are
designed for long, trouble-free service life under a wide variety
of application conditions with a minimum of maintenance,
however, the following should be considered.
1. LUBRICATION - Periodic external lubrication should
be applied slowly with a hand gun at all lubrication
fittings provided. A good quality of general purpose
grease is satisfactory in the majority of cases, however,
applications involving very high or low temperatures may
require other types of lubricants. Suggested frequency
of lubrication is once every 500 hours of operation. Do
not over-grease. Consult the factory if you have specific
lubrication questions.
2. PACKING ADJUSTMENT - New packed pumps, (Series
724) generally require some initial packing adjustment
to control leakage as packing “runs-in”. Make initial
packing adjustments carefully and do not over tighten
the packing gland. After initial adjustment, occasional
inspection will reveal the need for packing gland
adjustment and/or replacement of the packing. See
instructions in disassembly and reassembly regarding
repacking the pump.
3. END CLEARANCE ADJUSTMENT - After long
term operation it is sometimes possible to improve
the performance of the pump, without major repair,
through adjustment of end clearance of the pump.
Refer to instructions under End Clearance, page 6, for
information regarding this procedure.
4. RELIEF VALVE - If your pump is equipped with a relief
valve, adjustment can be made as follows. Remove the
adjusting screw cap, loosen the locknut and turn in the
adjusting screw to increase the pressure and turn-out
to decrease the pressure. If the pump is not producing
the rated capacity, adjustment of the relief valve may be
necessary.
5. CLEANING THE PUMP - It is good practice to keep the
pump as clean as possible. This will facilitate inspection,
adjustment and repair work and help prevent omission of
lubrication to fittings covered or hidden with dirt.
6. STORAGE - If the pump is to be stored or not used for
any appreciable length of time it should be drained and
a light coat of lubricating and preservative oil should be
applied to the internal parts. Lubricate all fittings. Rotate
by hand every 30 days.