Viking Pump TSM163: N-R 337/4337 - Manual (Page 2)

SECTION TSM 163 ISSUE D PAGE 2 OF 15
MAINTENANCE
INLET
OR
SUCTION
OUTLET
OR
SUCTION
RELIEF
VALVE
ADjUSTINg
SCREW
SPECIAL INFORMATION
ROTATION: Viking pumps operate equally well in a clockwise
or counterclockwise rotation. Shaft rotation determines which
port is suction and which is discharge. The suction port
location is where pumping elements (gear teeth) come out
of mesh.
FLUSH LINES: mechanically sealed pumps have a flush
connection from the seal chamber to the discharge port as
standard equipment and must be hooked up properly. If the
pump rotation is reversed, be sure the flush connections are
hooked up to the suction or discharge port as noted above to
avoid excessive leakage or damage to pump. If the pump is
handling heated product, be sure the flush line is insulated to
assure continued flow.
Jacketed head (R only, optional on N size) and rotor bearing
sleeve provide large chambers at both ends of the pumping
chamber for temperature control of product in pump. These
features do not alter basic steps in the disassembly and
assembly of your pump.
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. Relief valve options are available on these pumps.
Options include plain and jacketed relief valvs. N size
pumps with a jacketed head are not available with a
relief valve.
3. If the pump rotation is to be 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 the pressure relief valve and turn end
for end. Refer to Figure 2 below.
5. Pressure relief valves cannot be used to control the
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.
Series 337 and 4337 pumps are designed for long trouble
free 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 handgun 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 the need for packing gland adjustment or packing
replacement. Refer to instructions under DISASSEMBLY,
page 5, and Assembly, page 6, regarding repacking the
pump.
CLEANING PUMP: Keep the pump as clean as possible.
This will facilitate inspection; adjustment and repair work and
help prevent overlooking a dirt covered grease fitting.
STORAGE: If the 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 the pump shaft extension. Viking suggests rotating the
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 337 and 4337 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 (some mechanical seals and set
collars)
3. Packing hooks, flexible (packed pumps)
Large for 0.375 inch and up cross section packing
4. Bearing locknut spanner wrench
(Source: #471 J.H. Williams & Co. or equal)
5. Spanner wrench (Supplied with pump)
Viking Part Number 3-810-009-631
6. Brass Bar
7. Arbor Press
FIgURE 2
SPECIAL MECHANICAL SEALS: can be installed in a
modified stuffing box.
Extra care must be taken in repair of pumps with mechanical
seals. Read and follow all special information supplied with
the pump.