Viking Pump TSM141.1: G-LL 125/4125 - Manual (Page 3)

SECTION TSM 141.1 ISSUE E PAGE 3 OF 16
SPECIAL INFORMATION
MAINTENANCE
ROTATION: Viking pumps operate equally well in a clock-
wise or counterclockwise rotation. Shaft rotation determines
which port is suction and which is discharge. The port in the
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 or
a rupture disk.
2. There are relief valve options available on those pump
models designed to accept a relief valve. Options may
include a return to tank relief valve or a jacketed relief
valve. Pumps equipped with a jacketed head plate are
not available with an integral relief valve.
3. If pump rotation is reversed during operation, pressure
protection must be provided on both sides of the pump.
4. the relief valve adjusting screw cap must always point
towards the suction side of the pump. If pump rotation
is reversed, remove the pressure relief valve and turn
end for end. Refer to Figures 1, 2, 3 and 4, page 1.
5. Viking integral 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.
DANgER !
Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
relief valve adjusting cap fitting, etc.)
Be sure:
1. That any pressure in the chamber has
been completely vented through the
suction or discharge lines or other
appropriate openings or connections.
2. That the driving means (motor,
turbine, engine, etc.) has been “locked
out” or made non-operational so that
it cannot be started while work is
being done on pump.
3. That you know what liquid the
pump has been handling and the
precautions necessary to safely
handle the liquid. Obtain a material
safety data sheet (MSDS) for the
liquid to be sure these precautions
are understood.
Failure to follow above listed
precautionary measures may result in
serious injury or death.
Series 125 and 4125 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 life.
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 the 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 the
packing gland. After initial adjustment, periodic inspection will
reveal the need for packing gland adjustment or packing re-
placement. Refer to instructions under Disassembly, page
5, and Assembly, page 5, 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 the 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 125 and 4125 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 (packed pumps)
Viking Part No. 2-810-049-999-00; G-HL
Viking Part No. 2-810-042-999-00; AK-LL
4. Mechanical seal installation sleeve.
Viking Part No. 2-751-001-730 for 0.75 inch seal; G4125
Viking Part No. 2-751-002-730 for 1.12 inch seal;
H & HL4125
Viking Part No. 2-751-003-730 for 1.44 inch seal;
AK - LL4 125
5. Bearing locknut spanner wrench.
Viking Part No. 2-810-043-375-00
6. Spanner wrench, adjustable pin type for use on double
end caps. Viking Part No. 2-810-008-375-00
7. Brass bar.
8. Arbor press.
9. Standard 5/16” 12 point socket.
SPECIAL MECHANICAL SEALS can be installed either next
to the rotor hub or in the stuffing box. Consult the factory for
non-standard seal arrangements.
Extra care must be taken in the repair of pumps with
mechanical seals. Read and follow all special information
supplied with the pump and seal.