JACKETING of the bracket and head provide large chambers at both
ends of the pumping chamber and around the stuffing box for
temperature control of the product in the pump.
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 REUEF VALVES:
Pressure relief valves are standard on pumps with valve-
type heads; they are not available with jacketed type heads.
Jacketed relief valves are available for special applications.
Pumps not furnished with a relief valve must be provided
with some means of pressure protection (inline pressure
relief valve, torque limiting device, etc.).
If pump rotation is to be reversed during normal operation,
using same pump to load and unload, then pressure
protection must be provided on both sides of pump.
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, 2 and 3.
Pressure relief valves cannot be used to control pump flow
or regulate discharge pressure.
For additional information on pressure relief valves, refer to Technical
Service Manual TSMOO0 and Engineering Service Bulletin ESB-31.
SPECIAL MECHANICAL SEALS: Can be installed either next to rotor
hub or in an altered stuffing box.
Extra care should be taken in repair of pumps with mechanical seals.
Read and follow all special information supplied with pump.
Series 225 and 4225 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
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
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
SUGGESTED REPAIR TOOLS: The following tools must be available
to properly repair Series 225 and 4225 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.
Allen wrenches (some mechanical seals and set collars)
Packing hooks, flexible (packed pumps) Small for 1/4 inch
and 5/, 6 inch cross section packing Large for 3/6 inch and
up cross section packing
Mechanical seal installation sleeve 2-751-002-900 for 1/a
inch seal; H & HL 4225 2-751-003-900 for 1/16 inch seal; K
Bearing locknut spanner wrench (Source: #471 J. H.
Williams & Co. or equal)
Spanner wrench, adjustable pin type for use on double end
caps (Source: #482 J. H. Williams & Co. or equal)