Viking pump 124A Series Operating manual

SECTION TSM 630
PAGE 1 OF 10
ISSUE J
VIKING PUMP, INC. •A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA
TECHNICAL SERVICE MANUAL
CONTENTS
INTRODUCTION
The illustrations used in this manual are for identification
purposes only and cannot be used for ordering parts. Obtain
a parts list from a Viking Pump representative. Always give
a complete name of part, part number and material with the
model number and serial number of pump when ordering
repair parts. The unmounted pump or pump unit model
number and serial number are on the nameplate.
In the Viking model number system, basic size letters (G,
H, HL, AK, AL, K, KK, L, LQ, LL) are combined with series
number (124A, 4124A, 124AE, 4124B, 126A, 4126A, 123A,
4123A, 127A) indicating seal and pump construction material.
This manual deals only with Series 124A, 4124A, 124AE,
4124AE, 126A, 4126A, 123A, 4123A, 127A, and 4127A Heavy
Duty Bracket Mounted Pumps. Refer to Figures 1 through
12 for general configuration and nomenclature used in this
manual. Pump specifications and recommendations are listed
in Catalog Section 630, Heavy Duty Bracket Mounted Pumps,
with Universal Seal Type Bracket.
Safety Information & Instructions . . . . . . . . . . . . 2
Special Information . . . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . 3
Cartridge Mechanical Seal Pumps . . . . . . . . . . . 4
Packed Pumps . . . . . . . . . . . . . . . . . . . . . 6
Disassembly . . . . . . . . . . . . . . . . . . . . . . 6
Assembly . . . . . . . . . . . . . . . . . . . . . . . . 7
Thrust Bearing Adjustment . . . . . . . . . . . . . . . 8
Installation of Carbon Graphite Bushings . . . . . . . . 8
Pressure Relief Valve Instructions . . . . . . . . . . . 9
UNMOUNTED PUMP UNITS
PACKED MECH. SEAL A= Universal Seal Pump
AE = Universal Seal Pump
with larger rotor shaft
(L, LQ, LL only)
Units are designated by the
unmounted pump model numbers
followed by a letter indicating
drive style.
V= V-Belt
D= Direct Connected
R= Viking Speed Reducer
P= Commercial Speed Reducer
G124A G4124A
H124A
H126A
H123A
H127A
H4124A
H4126A
H4123A
H4127A
HL124A
HL126A
HL123A
HL127A
HL4124A
HL4126A
HL4123A
HL4127A
AK124A
AL124A
AK4124A
AL4124A
K124A
K126A
K123A
K127A
K4124A
K4126A
K4123A
K4127A
KK124A
KK126A
KK123A
KK127A
KK4124A
KK4126A
KK4123A
KK4127A
L124A
L124AE
L126A
L4124A
L4124AE
L4126A
LQ124A
LQ124AE
LQ126A
LQ123A
LQ127A
LQ4124A
LQ4124AE
LQ4126A
LQ4123A
LQ4127A
LL124A
LL124AE
LL126A
LL123A
LL127A
LL4124A
LL4124AE
LL4126A
LL4123A
LL4127A
FIGURE 2
SIZES H & HL
(H4124A shown)
FIGURE 1
SIZE G
(G4124A shown)
FIGURE 3
SIZES AK & AL
(AK4124A shown)
FIGURE 4
SIZES K & KK
(K123A shown)
FIGURE 5
SIZE LL
(LL4126A shown)
UNIVERSAL SEAL HEAVY DUTY PUMPS
SERIES 124A, 4124A, 124AE, AND 4124AE CAST IRON
SERIES 126A AND 4126A DUCTILE IRON
SERIES 123A AND 4123A STEEL
SERIES 127A AND 4127A STAINLESS STEEL
SIZES G, H, HL, AK, AL, K, KK, L, LQ, LL

SECTION TSM 630 ISSUE J PAGE 2 OF 10
BEFORE opening any liquid chamber (pumping
chamber, reservoir, relief valve adjusting cap fitting,
etc.) be sure that :
● Any pressure in the chamber has been completely
vented through the suction or discharge lines or
other appropriate openings or connections.
● The pump drive system means (motor, turbine,
engine, etc.) has been “locked out” or otherwise
been made non-operational so that it cannot be
started while work is being done on the pump.
● You know what material the pump has been
handling, have obtained a material safety data
sheet (MSDS) for the material, and understand
and follow all precautions appropriate for the safe
handling of the material.
BEFORE operating the pump, be sure all drive guards
are in place.
DO NOT operate pump if the suction or discharge
piping is not connected.
DO NOT place fingers into the pumping chamber or
its connection ports or into any part of the drive train
if there is any possibility of the pump shafts being
rotated.
DO NOT exceed the pumps rated pressure, speed, and
temperature, or change the system/duty parameters
from those the pump was originally supplied, without
confirming its suitability for the new service.
BEFORE operating the pump, be sure that:
● It is clean and free from debris
● all valves in the suction and discharge pipelines
are fully opened.
● All piping connected to the pump is fully supported
and correctly aligned with the pump.
● Pump rotation is correct for the desired direction
of flow.
INSTALL pressure gauges/sensors next to the
pump suction and discharge connections to monitor
pressures.
USE extreme caution when lifting the pump. Suitable
lifting devices should be used when appropriate. Lifting
eyes installed on the pump must be used only to lift
the pump, not the pump with drive and/or base plate.
If the pump is mounted on a base plate, the base plate
must be used for all lifting purposes. If slings are used
for lifting, they must be safely and securely attached.
For weight of the pump alone (which does not include
the drive and/or base plate) refer to the Viking Pump
product catalog.
DO NOT attempt to dismantle a pressure relief valve
that has not had the spring pressure relieved or is
mounted on a pump that is operating.
AVOID contact with hot areas of the pump and/or
drive. Certain operating conditions, temperature
control devices (jackets, heat-tracing, etc.), improper
installation, improper operation, and improper
maintenance can all cause high temperatures on the
pump and/or drive.
THE PUMP must be provided with pressure protection.
This may be provided through a relief valve mounted
directly on the pump, an in-line pressure relief valve,
a torque limiting device, or a rupture disk. If pump
rotation may be reversed during operation, pressure
protection must be provided on both sides of pump.
Relief valve adjusting screw caps must always point
towards suction side of the pump. If pump rotation is
reversed, position of the relief valve must be changed.
Pressure relief valves cannot be used to control pump
flow or regulate discharge pressure. For additional
information, refer to Viking Pump’s Technical Service
Manual TSM 000 and Engineering Service Bulletin
ESB-31.
THE PUMP must be installed in a matter that allows
safe access for routine maintenance and for inspection
during operation to check for leakage and monitor
pump operation.
WARNING
SAFETY INFORMATION AND INSTRUCTIONS
Danger - Failure to follow the indicated
instruction may result in serious injury
or death.
Warning - In addition to possible serious
injury or death, failure to follow the
indicated instruction may cause damage
to pump and/or other equipment.
IMPROPER INSTALLATION, OPERATION OR MAINTENANCE OF PUMP MAY CAUSE SERIOUS INJURY
OR DEATH AND/OR RESULT IN DAMAGE TO PUMP AND/OR OTHER EQUIPMENT. VIKING’S WARRANTY
DOES NOT COVER FAILURE DUE TO IMPROPER INSTALLATION, OPERATION OR MAINTENANCE.
THIS INFORMATION MUST BE FULLY READ BEFORE BEGINNING INSTALLATION, OPERATION OR
MAINTENANCE OF PUMP AND MUST BE KEPT WITH PUMP. PUMP MUST BE INSTALLED, OPERATED
AND MAINTAINED ONLY BY SUITABLY TRAINED AND QUALIFIED PERSONS.
THE FOLLOWING SAFETY INSTRUCTIONS MUST BE FOLLOWED AND ADHERED TO AT ALL TIMES.
WARNING
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Legend :
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WARNING
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SECTION TSM 630 ISSUE J PAGE 3 OF 10
MAINTENANCESPECIAL INFORMATION
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 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 and a jacketed relief
valve. Pumps equipped with a jacketed head plate are
generally not available with 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.
5. 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 TSM000 and Engineering
Service Bulletin ESB-31.
SPECIAL MECHANICAL SEALS:
Extra care should be taken in repair of these pumps. Be sure
to read and follow all special instructions supplied with your
pump.
Series 124A, 4124A, 126A, 4126A, 123A, 4123A, 127A, and
4127A 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. Refer to
Engineering Service Bulletin ESB-515. Consult factory with
specific lubrication questions. Applications involving very high
or low temperatures will require other types of lubrication.
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 and Assembly,
page 6, regarding repacking pump.
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 light 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 the oil. Tighten all pump
assembly bolts before putting pump in service after being
stored.
SUGGESTED REPAIR TOOLS: The following tools must
be available to properly repair series 124A, 4124A, 126A,
4126A, 123A, 4123A, 127A, and 4127A 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)
4. Mechanical seal installation sleeve
2-751-001-730 for 0.75 inch seal; G pumps.
2-751-002-730 for 1.125 inch seal; H-HL pumps.
2-751-003-730 for 1.4375 inch seal; AK-LL “A” pumps.
No sleeve needed for L, LQ, LL “AE” pumps.
5. Bearing locknut spanner wrench
(Source: #471 J. H. Williams & Co. or equal)
6. Spanner wrench, adjustable pin type for use on bearing
housing (Source: #482 J. H. Williams & Co. or equal)
7. Brass or hardwood bar
8. Arbor press
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.

SECTION TSM 630 ISSUE J PAGE 4 OF 10
FIGURE 6 - EXPLODED VIEW SERIES 4123A, 4124A, 4124AE, 4126A, AND 4127A MODELS
ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1Locknut 17 Capscrews, Seal Gland 37 Idler and Bushing Assembly
2Lockwasher (Not G) 19 Seal (Cartridge Seal Shown) 38 Idler Bushing
3End Cap 25 Bracket Bushing 39 Idler Pin
4Bearing Spacer Collar (Outer) 27 Bracket and Bushing Assembly 40 Head and Idler Pin Assembly
5Lip Seal 28 Capscrew for Bracket 43 Capscrew for Head
6Ball Bearing 29 Bracket Gasket 45 Relief Valve Gasket
7Bearing Housing 30 Pipe Plug 46 Capscrew for Valve
8Bearing Spacer Collar (Inner) 31 Casing (Tapped or Flanged) 47 Internal Relief Valve
11 Ring, Half Round (Not G, H, HL) 35 Head Gasket 50 Seal Gland Washers
12 Grease Fitting 36 Rotor and Shaft Assembly 50A Seal Gland Lock Washers
REPAIR: MODELS G, H, HL, AK, AL, K, KK, L, LQ & LL
CARTRIDGE MECHANICAL SEAL PUMPS
CARTRIDGE MECHANICAL
SEAL REPLACEMENT
CARTRIDGE MECHANICAL
SEAL REMOVAL
MODELS:
G, H, HL, AK, AL, K, KK, L, LQ, & LL4124A CAST IRON
L, LQ, & LL4124AE CAST IRON
H, HL, K, KK, L, LQ & LL4126A DUCTILE IRON
H, HL, K, KK, LQ & LL4123A STEEL
H, HL, K, KK, LQ & LL4127A STAINLESS STEEL
1. Insert length of hardwood or brass through port opening
between rotor teeth to keep shaft from turning. Bend up
tang of lockwasher and with a spanner wrench, remove
locknut and lockwasher from shaft.
Note: G size has no lockwasher.
2. Loosen two set screws in the face of the bearing housing
and remove the bearing housing assembly from the
bracket.
3. Remove the pair of half round rings under the inner
spacer collar from the shaft. There are no half round
rings on the G, H and HL size pumps.
4. If suckback, flush or barrier fluid tubes are connected
to the seal gland, disconnect before removing seal.
Replace or turn centering clips to original position.
Loosen the set screws on the cartridge seal collar to free
the cartridge seal from the shaft. Remove the two gland
capscrews and slide cartridge seal out through bearing
housing opening.
1. NOTE: Burrs left on shaft can damage O-ring on seal
sleeve during installation. Inspect shaft for burrs and
remove any found with a fine grade of emery cloth.
2. Clean rotor shaft and face of seal chamber.
CARTRIDGE MECHANICAL
SEAL INSTALLATION
1
2
3
5
4
6
5
8
11
7
16
50A
50 19 17 28
27
12
25 29
30
30
31
36 37 38 35
39
40 43 45 47 46
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.
For complete pump disassembly and assembly see
pages 6 and 7.

SECTION TSM 630 ISSUE J PAGE 5 OF 10
3. Place tapered installation sleeve on shaft. Coat rotor
shaft, tapered installation sleeve, and O-ring in the
inside diameter of cartridge seal sleeve with a generous
amount of light oil. Refer to Figure 7.
4. Slide cartridge seal over installation sleeve on shaft
until it contacts the seal chamber face. Remove tapered
installation sleeve from shaft.
5. Place pair of half round rings in groove on shaft and turn
bearing housing assembly into bracket. There are no
half round rings on the G, H and HL size pumps.
6. Put lockwasher and locknut on shaft. Tighten locknut
and bend one tang of lockwasher into slot of locknut.
Note: G size has no lockwasher.
7. Adjust pump end clearance as in Thrust Bearing
Adjustment page 8.
8. Insert gland capscrews and secure gland to bracket face.
NOTE: turn shaft several turns while gland is loose to
center seal; then tighten gland tight enough to compress
gasket. Tighten only enough to contain leakage and not
to distort gland.
9. Lock cartridge seal drive collar to shaft and remove or turn
centering clips out of the way so as to clear the drive collar.
10. Turn shaft by hand or jog motor to check drive collar for
runout.
11. Connect suckback or flush line or vent stuffing box seals
without flush line until liquid is present on start up.
NOTE: For maximum seal life, suckback or flush line
should be used.
FIGURE 7
TAPERED INSTALLATION SLEEVE
COAT ROTOR SHAFT, TAPERED INSTALLATION
SLEEVEAND INNER DIAMETER OF MECHANICAL
SEAL WITH LIGHT OIL BEFORE ASSEMBLY.
SHAFT
DANGER !
Before starting pump, be sure all drive equipment
guards are in place.
Failure to properly mount guards may result in
serious injury or death.
ASSEMBLY
COMPONENT MECHANICAL SEAL
MODELS:
G, H, HL, AK, AL, K, KK, L, LQ, AND LL4124A CAST IRON
L, LQ AND LL 4124AE CAST IRON
H, HL, K, KK, L, LQ, AND LL4126A DUCTILE IRON
H, HL, K, KK, LQ, AND LL4123A STEEL EXTERNALS
H, HL, K, KK, LQ AND LL4127A STAINLESS STEEL
This seal type can be installed as an alternate to the cartridge
mechanical seal. The seal is setscrew driven, is simple to
install and good performance will result if care is taken during
installation.
For complete pump disassembly and assembly see pages
6 and 7. For Step 6, disassembly, remove the appropriate
nuts, capscrews, seal holder and seal seat. Remove the pipe
plug in the bracket and loosen the setscrews holding the
mechanical seal rotary member to the shaft. This must be
done before the rotor is removed to avoid damage to the seal
and the rotor shaft.
The following steps are for mechanical seal assembly.
1. Clean rotor shaft and seal housing bore. Make sure
they are free of dirt, grit and scratches. Gently radius
leading edge of the shaft diameter over which seal is to
be placed.
Never touch mechanical seal faces with anything except
clean hands or clean cloth. Minute particles can scratch
the seal faces and cause leakage.
2. Place tapered installation sleeve on the shaft. Coat
tapered sleeve and inside of the rotary member
with a generous quantity of light oil. Grease is not
recommended. Start rotary member on shaft and over
tapered sleeve. Refer to Figure 8.
FIGURE 8
TAPERED INSTALLATION SLEEVE
SHAFT
MECHANICAL SEAL
ROTARY MEMBER
3. Move rotary member so setscrews are directly below seal
access holes on side of bracket. Tighten all setscrews
securely to shaft. Some seals are equipped with holding
clips which compress the seal springs. Remove holding
clips to release springs after seal is installed on shaft.
4. FOR “O-RING” GASKET TYPE MECHANICAL SEAL
SEAT: Lubricate outer diameter of O-Ring seal gasket
with oil. Flush sealing faces of both rotary member and
seal seat with oil and press seal seat in to bore until back,
unlapped face, is flush with bore. Install seal holder,
capscrews, and nuts and tighten securely. Remove
tapered installation sleeve.
FOR “CLAMPED-IN” TYPE MECHANICAL SEAL
SEAT: Flush sealing faces of both rotary member and
seal seat with oil and install seal seat and seat gasket
over end of shaft against machined bracket face. Install
other seal gasket, seal holder, capscrews, and nuts and
tighten securely. Remove tapered installation sleeve.
5. Connect suckback or flush line or vent stuffing box for
seals without flush line until liquid is present on start up.
NOTE: For maximum seal life, suckback or flush line
should be used.

SECTION TSM 630 ISSUE J PAGE 6 OF 10
DISASSEMBLY
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.
FIGURE 9 - EXPLODED VIEW SERIES 123A, 124A, 126A, AND 127A MODELS
ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1Locknut 16 Packing Gland Nuts 36 Rotor and Shaft Assembly
2Lockwasher 17 Packing Gland Capscrews 37 Idler and Bushing Assembly
3End Cap 19 Packing 38 Idler Bushing
4Bearing Spacer Collar (Outer) 20 Packing Retainer Washer 39 Idler Pin
5Lip Seal 25 Bracket Bushing 40 Head and Idler Pin Assembly
6Ball Bearing 27 Bracket and Bushing Assembly 43 Capscrew for Head
7Bearing Housing 28 Capscrew for Bracket 45 Relief Valve Gasket
8Bearing Spacer Collar (Inner) 29 Bracket Gasket 46 Capscrew for Valve
11 Ring, Half Round (Not G, H, HL) 30 Pipe Plug 47 Internal Relief Valve
12 Grease Fitting (Not G) 31 Casing (Tapped or Flanged)
15 Packing Gland 35 Head Gasket
PUMP SIZE STANDARD “830” PACKING P/N NUMBER OF PACKING RINGS
G 2-520-083-830-00 4
H, HL 2-520-067-830-00 5
AK, AL 2-520-066-830-00 5
K, KK 2-520-066-830-00 6
L, LQ, LL 2-520-066-830-00 6
L, LQ, LL "AE" 2-520-043-830-00 7
REPAIR: MODELS G, H, HL, AK, AL, K, KK, L, LQ & LL
PACKED PUMPS
1
2
3
5
4
6
5
8
11
7
28
27
12
25 29
30
30
31
36 37 38 35
39
40 43 45 47 46
15 17 19 20
16
TABLE 1 - PACKING RING CHART

SECTION TSM 630 ISSUE J PAGE 7 OF 10
ASSEMBLY
1. Mark head and casing before disassembly to insure
proper reassembly. The idler pin, which is offset in pump
head, must be positioned toward and equal distance
between port connections to allow for proper flow of
liquid through the pump.
Remove head from pump. Do not allow idler to fall from
idler pin. Tilt top of head back when removing to prevent
this. Avoid damaging head gasket. If pump is furnished
with pressure relief valve, it need not be removed from
head or disassembled at this point. Refer to Pressure
Relief Valve Instructions, page 9.
If pump has jacketed head plate, it will separate from
head when it is removed. The gasket between head and
jacket head plate must be totally removed. Use new
gasket when assembling pump.
2. Remove idler and bushing assembly.
3. Insert length of hardwood or brass through port opening
between rotor teeth to keep shaft from turning. Bend up
tang of lockwasher and with a spanner wrench, remove
locknut and lockwasher from shaft.
Note: G size has no lockwasher.
4. Loosen two setscrews in the face of the bearing housing
and remove the bearing housing assembly from the
bracket. Refer to Figure 10.
FIGURE 10
HALF ROUND
RINGS
END CAP
LIP SEAL
SPACER COLLAR
SETSCREW
SHAFT
SETSCREW
BEARING HOUSING
BALL BEARING
1. Install bracket bushing. If bracket bushing has a
lubrication groove, install bushing with groove at
6 o’clock position in bracket. If carbon graphite, Refer
to Installation of Carbon Graphite Bushings, page 8.
2. Coat shaft of rotor shaft assembly with light oil. Start
end of shaft in bracket bushing turning from right to left,
slowly pushing rotor in casing.
3. Coat idler pin with light oil and place idler and bushing
on idler pin in head. If replacing with carbon graphite
bushing, Refer to installation of Carbon Graphite
Bushings, page 8.
4. Using a .010 to .015 inch head gasket, install head and
idler assembly on pump. Pump head and casing were
marked before disassembly to insure proper reassembly.
If not, be sure idler pin, which is offset in pump head,
is positioned toward the equal distance between port
connections to allow for proper flow of liquid through
pump. If pump is equipped with jacketed headplate,
install at this time along with new gasket.
Tighten head capscrews evenly.
5. When assembling packed pump, use packing suitable
for liquid being pumped. Install packing, staggering the
joints from one side of shaft to other. Lubricate packing
rings with oil, grease, or graphite to aid assembly. Install
packing gland, capscrews, and nuts. Make sure gland is
installed square and nuts are tightened evenly. Tighten
nuts until packing gland is snug against packing.
6. Slide inner spacer collar over shaft with recessed end
facing rotor. G, H and HL size bearing spacer collars are
not recessed.
Place pair of half round rings on shaft and slide inner
bearing spacer collar over half round rings to lock them
in place. There is no pair of half round rings on the G, H
and HL size pumps.
7. Install the lip seal (lip toward end of shaft) in the bearing
housing and turn the bearing housing into the bracket.
8. Pack the ball bearing with grease, place on the shaft and
push or drive into place in housing.
Note: G size has sealed bearing.
5. Remove pair of half round rings under the inner spacer
collar from the shaft. There are no half round rings on the
G, H and HL size pumps.
6. Remove packing gland capscrews, slide packing gland
out of stuffing box, and remove packing.
NOTE: Reference cartridge seal replacement beginning
on page 4 when disassembling seal pump.
7. Carefully remove rotor and shaft to avoid damaging
bracket bushing.
8. Loosen two radial setscrews in flange of bearing housing
and with a spanner wrench remove the outer end cap
with lip seal and outer bearing spacer collar.
9. Remove the double row ball bearing, lip seal and inner
bearing spacer collar from the bearing housing.
10. Clean all parts thoroughly and examine for wear and
damage. Check lip seals, ball bearing, bushings, and
idler pin and replace if necessary. Check all other parts
for nicks, burrs, excessive wear and replace if necessary.
Wash bearings in clean solvent. Blow out bearings with
compressed air. Do not allow bearings to spin; turn them
slowly by hand. Spinning bearings will damage race and
balls. Make sure bearings are clean, then lubricate with
light oil and check for roughness. Roughness can be
determined by turning outer race by hand.
Note: G size has sealed bearings.
11. Casing can be checked for wear or damage while
mounted on bracket.

SECTION TSM 630 ISSUE J PAGE 8 OF 10
When installing carbon graphite bushings, extreme care
must be taken to prevent breaking. Carbon graphite is a
brittle material and easily cracked. If cracked, the bushing will
quickly disintegrate. Using a lubricant and adding a chamfer
on the bushing and the mating part will help in installation.
The additional precautions listed below must be followed for
proper installation.
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Starting and stopping will result in a cracked
bushing.
4. Check bushing for cracks after installation.
Carbon graphite bushings with extra interference fits are
frequently furnished for high temperature operation. These
bushings must be installed by a shrink fit.
1. Heat bracket or idler to 750ºF.
2. Install cool bushing with a press.
3. If facilities are not available to reach 750ºF. temperature,
it is possible to install with 450ºF. temperature; however
the lower the temperature the greater the possibility of
cracking the bushing.
Consult factory with specific questions on high temperature
applications. Refer to Engineering Service Bulletin ESB-3.
INSTALLATION OF CARBON
GRAPHITE BUSHINGS
PUMP
SIZE MODEL
STANDARD
END
CLEARANCE
(INCH)
TURN
BEARING
HOUSING
CCW LENGTH
ON OD (INCH)
ADDITIONAL
LENGTH ON
OD BEARING
HOUSE FOR
0.001" END
CLEARANCE
(INCH)
G124A
4124A 0.003” 0.60” 0.20”
H
HL
124A
4124A
126A
4126A
123A
4123A
0.003” 0.75”
.22”
127A
4127A 0.005” 1.125”
AK
AL
K
KK
L/LQ
LL
124A
4124A
124AE
4124AE
126A
4126A
123A
4123A
0.005” 1.25”
.25”
127A
4127A 0.008” 2”
1. Loosen the two set screws in the outer face of the
bearing housing and turn this thrust bearing assembly
clockwise until it can no longer be turned by hand. Back
off counter-clockwise until the rotor shaft can be turned
by hand with a slight noticeable drag.
2. For standard end clearance, back off the thrust bearing
assembly the required length measured on the outside
diameter of the bearing housing. See Table 2.
3. Tighten the two self-locking type “Allen” set screws, in
the outboard face of the bearing housing, with equal
force against the bracket. Your pump is now set with
standard end clearances and locked.
NOTE: Be sure the shaft can rotate freely. If not, back off
additional length on outside diameter and check again.
4. High viscosity liquids required additional end
clearances. The amount of extra end clearance depends
on the viscosity of the liquid pumped. For specific
recommendations, consult your Viking Pump distributor.
THRUST BEARING ADJUSTMENT
SIZE G, H, HL, AK, AL, K, KK, L, LQ
& LL PUMPS
TABLE 2 - END CLEARANCE CHART
9. Install the lipseal (with lip toward end of shaft) and
bearing spacer collar in the outer end cap and turn the
end cap into the bearing housing until tight against the
bearing. Lock in place with two set screws in the flange
of the bearing housing.
10. Put lockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor
teeth to keep shaft from turning. Tighten locknut to
20-30 ft.–lbs. torque (G), 50-70 ft.–lbs. torque (H, HL) or
100-130 ft.–lbs. torque (AK, AL, K, KK, L, LQ, LL). Bend
one tang of lockwasher into slot of locknut. If tang does
not line up with slot, tighten locknut until it does. Failure
to tighten locknut or engage lockwasher tang could result
in early bearing failure and cause damage to pump.
Remove length of hardwood or brass from port opening.
11. Adjust pump end clearance as in Thrust Bearing
Adjustment page 8.
12. Lubricate all grease fittings with multi-purpose grease,
NLGI #2. G size has sealed bearing and is not
regreasable.
DANGER !
Before starting pump, be sure all drive equipment
guards are in place.
Failure to properly mount guards may result in
serious injury or death.

SECTION TSM 630 ISSUE J PAGE 9 OF 10
PRESSURE RELIEF VALVE
INSTRUCTIONS
VALVE - LIST OF PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet
FIGURE 11 - SIZES G, H AND HL
VALVE - LIST OF PARTS
1. Valve Cap 6. Valve Body
2. Adjusting Screw 7. Valve Spring
3. Lock Nut 8. Poppet
4. Spring Guide 9. Cap Gasket
5. Bonnet 10. Bonnet Gasket
FIGURE 12 - SIZES K, KK, L, LQ AND LL
DISASSEMBLY
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.
Mark valve and head before disassembly to insure proper
reassembly.
1. Remove valve cap.
2. Measure and record length of extension of adjusting
screw. Refer to “A” on Figure 11 and Figure 12.
3. Loosen locknut and back out adjusting screw until spring
pressure is released.
4. Remove bonnet, spring guide, spring and poppet from
valve body. Clean and inspect all parts for wear or
damage and replace if necessary.
If a new spring is installed or if pressure setting of pressure
relief valve is to be changed from that which the factory has
set, the following instructions must be carefully followed.
1. Carefully remove valve cap which covers adjusting screw.
Loosen locknut which locks adjusting screw so pressure
setting will not change during operation of pump.
2. Install a pressure gauge in discharge line for actual
adjusting operation.
3. Turn adjusting screw in to increase pressure and out to
decrease pressure.
4. With discharge line closed at point beyond pressure
gauge, gauge will show maximum pressure valve will
allow while pump is in operation.
PRESSURE ADJUSTMENT
Reverse procedures outlined under Disassembly. If valve
is removed for repairs be sure to replace in same position.
Relief valve adjusting screw cap must always point towards
suction side of pump. If pump rotation is reversed, remove
relief valve and turn end for end.
ASSEMBLY

SECTION TSM 630
PAGE 10 OF 10
ISSUE J
VIKING PUMP, INC. •A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA © 1/2018 Viking Pump Inc.
All rights reserved
WARRANTY
Viking pumps, strainers and reducers are warranted to be
free of defects in material and workmanship under normal
conditions of use and service. The warranty period varies by
type of product. A Viking product that fails during its warranty
period under normal conditions of use and service due to a
defect in material or workmanship will be repaired or replaced
by Viking. At Viking’s sole option, Viking may refund (in cash
or by credit) the purchase price paid to it for a Viking product
(less a reasonable allowance for the period of use) in lieu of
repair or replacement of such Viking product. Viking’s warranty
is subject to certain restrictions, limitations, exclusions and
exceptions. A complete copy of Viking’s warranty, including
warranty periods and applicable restrictions, limitations,
exclusions and exceptions, is posted on Viking’s website
(www.vikingpump.com/warranty/warranty-info). A complete
copy of the warranty may also be obtained by contacting
Viking through regular mail at Viking Pump, Inc., 406 State
Street, Cedar Falls, Iowa 50613, USA.
THIS WARRANTY IS AND SHALL BE VIKING’S SOLE
AND EXCLUSIVE WARRANTY AND IS IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ALL WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NON-INFRINGMENT, ALL OF WHICH
OTHER WARRANTIES ARE EXPRESSLY EXCLUDED.
THE RIGHTS AND REMEDIES UNDER THIS WARRANTY
ARE AND SHALL BE THE SOLE AND EXCLUSIVE RIGHTS
AND REMEDIES AGAINST VIKING. EXCEPT FOR THE
SPECIFIC LIABILITIES AND OBLIGATIONS PROVIDED
UNDER THIS WARRANTY, VIKING SHALL HAVE NO
LIABILITY OR OBLIGATION WITH RESPECT TO ANY
PRODUCT CLAIMED TO BE DEFECTIVE IN ANY MANNER.
UNDER NO CIRCUMSTANCES SHALL VIKING BE
LIABLE UNDER THIS WARRANTY OR OTHERWISE FOR
SPECIAL, INCIDENTAL, INDIRECT, CONSEQUENTIAL OR
PUNITIVE DAMAGES OF ANY KIND, INCLUDING, BUT NOT
LIMITED TO, LOST OR UNREALIZED SALES, REVENUES,
PROFITS, INCOME, COST SAVINGS OR BUSINESS, LOST
OR UNREALIZED CONTRACTS, LOSS OF GOODWILL,
DAMAGE TO REPUTATION, LOSS OF PROPERTY, LOSS
OF INFORMATION OR DATA, LOSS OF PRODUCTION,
DOWNTIME, OR INCREASED COSTS, IN CONNECTION
WITH ANY PRODUCT, EVEN IF VIKING HAS BEEN ADVISED
OR PLACED ON NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES AND NOTWITHSTANDING THE FAILURE OF
ANY ESSENTIAL PURPOSE OF ANY PRODUCT.
TECHNICAL SERVICE MANUAL
In ordering parts for pressure relief valve, always give
model number and serial number of pump as it appears on
nameplate and name of part wanted. When ordering springs,
be sure to give pressure setting desired.
IMPORTANT
UNIVERSAL SEAL HEAVY DUTY PUMPS
SERIES 124A, 4124A, 124AE, AND 4124AE CAST IRON
SERIES 126A AND 4126A DUCTILE IRON
SERIES 123A AND 4123A STEEL
SERIES 127A AND 4127A STAINLESS STEEL
SIZES G, H, HL, AK, AL, K, KK, L, LQ, LL