Special information maintenance – Viking Pump TSM211: F-G 724/4724 User Manual

Page 3

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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.

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