Viking Pump TSM143: N-P 335/4335 - Manual (Page 2)

SECTION TSM 143 ISSUE E PAGE 2 OF 15
fIGURE 2
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.
CIRCULATION LINES: are standard equipment (N & R size
only) and must be properly connected. Packed pumps have
a line connected from the packing chamber to the discharge
port. Mechanical seal pumps have a line connected from
the seal chamber to the suction port. If the pump rotation is
reversed be sure the circulation lines are connected 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 circulation line is insulated to assure
continued flow.
The jacketed head (R & P 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 the pump. These features do not alter basic steps in the
disassembly and assembly of your pump.
PRESSURE RELIEF VALVES:
1. Viking pumps are positive placement 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. A non-jacketed relief valve is standard on these pumps.
Options include plain and jacketed relief valves. N size
pumps with a jacketed head with a relief valve is not
available . R size pumps are standard with a jacketed
head but also have both plain and jacketed relief valve
available as options. P size pumps are standard with a
jacketed head and non-jacketed relief valve.
3. If the pump rotation is to be reversed during operation,
pressure protection must be provided on both sides of
pump.
4. The 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.
5. Pressure relief valves cannot be used to control the pump
flow or regulate the discharge pressure.
For additional information on pressure relief valves, refer to
Technical Service Manual TSM000 and Engineering Service
Bulletin ESB-31.
SPECIAl INfORMATION
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 bulleting ESb-515. Consult factory with specific
lubrication questions.
PACKING ADJUSTMENT: New packed pumps require an
initial packing adjustment to control leakage as the packing
“runs in”. Make initial adjustments carefully and do not
over-tighten the packing gland. After the initial adjustment,
inspection will reveal the need for packing gland adjustment
or packing replacement. Refer to instructions under
DISASSEMbly, page 4, 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, the 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 335 and 4335 pumps.
These tools are in addition to standard mechanics’ tools such
as open end wrenches, pliers, screwdrivers etc. Most of the
listed items can be obtained from an industrial supply house.
1. Soft Headed Hammer
2. Allen Wrenches (for 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
SPECIAL MECHANICAL SEALS: can be installed in a
modified stuffing box.
Extra care must be taken in the repair of pumps with
mechanical seals. Read and follow all special information
supplied with the pump.
MAINTENANCE
The Series 335 and 4335 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.
INLET
OR
SUCTION
OUTLET
OR
DISCHARGE
RELIEF VALVE
ADJUSTING
SCREW CAP