Viking pump Series 123 Operating manual

TECHNICAL SERVICE MANUAL
HEAVY-DUTY STEEL EXTERNAL BRACKET MOUNTED PUMPS
SERIES 123 AND 4123
SIZES LS, Q, QS, M
SECTION TSM 151.2
PAGE 1 OF 14
ISSUE B
CONTENTS
Introduction
Special Information
Maintenance
Packed Pumps
Mechanical Seal Pumps
Standard Rubber Bellows Type
(Sizes LS, Q, QS & M)
Optional Teflon Seal
Thrust Bearing Adjustment
Installation of Carbon Graphite Bushings
Pressure Relief Valve Instructions
INTRODUCTION
The illustrations in this manual are for identification purposes
only and cannot be used for ordering parts. Obtain a parts
list from the factory or a Viking Representative. Always give
complete name of part, part number and material with model
number and serial number of pump when ordering repai
r
parts. The unmounted pump or pump unit model numbe
r
and serial number are on the nameplate.
In the Viking model number system, basic size letters are
combined with series number (123 and 4123) indicating both
unmounted or mounted pump unit.
UNMOUNTED PUMP UNITS
PACKED
LS123
Q123
QS123
M123
MECH. SEAL
LS4123
Q4123
QS4123
M4123
Units are designated by the un-
mounted pump model numbers
followed by a letter(s)
indicating drive style.
V = V-Belt
D = Direct Connected
R = Viking Speed Reducer
P = Commercial Speed Reducer
This manual deals only with Series 123 and 4123 heavy-
duty Steel External Bracket Mounted Pumps. Refer to
Figures 1 through 14 for general configuration and
nomenclature used in this manual. Pump specifications and
recommendations are listed in Catalog Section 151, Series
123 and 4123 Heavy-Duty Steel External Bracket Mounted
Pumps.
FIGURE 1
SIZE LS
FIGURE 2
SIZES Q, QS AND M
VIKING PUMP INC. •
A Unit of IDEX Corporation •
1
2
2
3
7
11
12
12
13

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 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. 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 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 pressure relief valve and turn end for
end. Refer to Figures 1 and 2.
5. Pressure relief valves cannot be used to control pump
flow or regulate discharge pressure.
DANGER
BEFORE OPENING ANY VIKING PUMP
LIQUID CHAMBER (PUMPING CHAMBER,
RESERVOIR, RELIEF VALVE ADJUSTING
CAP FITTING, ETC.) BE SURE:
1. THAT ANY PRESSURE IN CHAMBER
HAS BEEN COMPLETELY VENTED
THROUGH 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 THE ABOVE
LISTED PRECAUTIONARY MEASURES
MAY RESULT IN SERIOUS INJURY OR
DEATH.
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 pumps with mechanical seals. Read and follow all
special information supplied with pump.
MAINTENANCE
Series 123 and 4123 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 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 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 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 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 the oil.
SUGGESTED REPAIR TOOLS: The following tools must be
available to properly repair Series 123 and 4123 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. Mechanical seal installation sleeve
2-751-005-630 for 2.4375 inch Q-M4123
5. Bearing locknut spanner wrench
(Source: #471 J.H. Williams & Co. or equal)
6. Spanner wrench, adjustable pin type for use on double
end caps (Source #482 J.H. Williams & Co or equal)
7. Brass Bar
8. Arbor Press
SPECIAL INFORMATION
SECTION TSM 151.2 ISSUE B PAGE 2 OF 14

ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1 Locknut 14 Packing Retainer Washer 27 Idler Bushing
2 Lockwasher 15 Bracket Bushing 28 Head Gasket
3 End Cap, Outer 16 Grease Fitting 29 Idler Pin
4 Lip Seal for End Cap 17 Bracket and Bushing 30 Head and Idler Pin
5 Bearing Spacer Collar, Outer 18 Capscrew for Bracket 31 Gasket for Jacket Head Plate
6 Ball Bearing 19 Bracket Gasket 32 Jacket Head Plate
7 Bearing Spacer Collar, Inner 20 Casing 33 Capscrew for Head
8 Ring, Half Round 21 Nut for Flanges 34 Relief Valve Gasket
9 End Cap, Inner 22 Capscrew for Flanges 35 Capscrew for Relief Valve
10 Packing Gland 23 Pipe Flange Gasket 36 Internal Relief Valve
11 Packing Gland Nut 24 Pipe Plug 37 Cover Plate, Relief Valve
12 Packing Gland Capscrew 25 Rotor and Shaft 38
13 Packing 26 Idler and Bushing 39
EXPL
O
DED VIEW M
O
DEL L
S
12
3
PACKED PUMPS
FIGURE 3
CUTAWAY OF PACKED PUMP MODEL Q OR M123 (QS casing has opposite ports)
SECTION TSM 151.2 ISSUE B PAGE 3 OF 14
IDLER PIN
CASING
S
HAFT
BRA
C
KET
R
O
T
OR
PA
C
KIN
G
G
LAND
PA
C
KIN
G
IDLER
HEAD

DANGER
BEFORE OPENING ANY VIKING PUMP
LIQUID CHAMBER (PUMPING CHAMBER,
RESERVOIR, RELIEF VALVE ADJUSTING
CAP FITTING, ETC.) BE SURE:
1. THAT ANY PRESSURE IN CHAMBER
HAS BEEN COMPLETELY VENTED
THROUGH 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 THE ABOVE LISTED
PRECAUTIONARY MEASURES MAY
RESULT IN SERIOUS INJURY OR DEATH.
EXPL
O
DED VIEW
Q,
QS
AND M12
3
ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1 Locknut 13 Bracket Bushing 25 Idler Bushing
2 Lockwasher 14 Bracket and Bushing 26 Head Gasket
3 End Cap, Outer 15 Grease Fitting 27 Idler Pin
4 Lip Seal for End Cap 16 Capscrew for Bracket 28 Head and Idler Pin
5 Bearing Spacer Collar 17 Bracket Gasket 29 Stud for Head
6 Ball Bearing 18 Nut, for Flanges 30 Nut for Head
7 End Cap, Inner 19 Stud for Flanges 31 Relief Valve Gasket
8 Packing Gland 20 Casing *32 Capscrew for Relief Valve
9 Packing Gland Nut 21 Pipe Flange Gasket 33 Internal Relief Valve
10 Packing Gland Capscrew 22 Pipe Plug Suckback Line, Not illus
11 Packing 23 Rotor and Shaft
12 Packing Retainer Washer 24 Idler and Bushing
*QS Casing has Opposite ports
DISASSEMBL
Y
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 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 13.
If LS 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. Q, QS and M
pumps have jacketed plate welded to head.
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.
Remove length of hardwood or brass from port opening
4. Remove packing gland nuts.
5. Tap shaft forward approximately 0.50 inch and remove
pair of half round rings under inner bearing spacer
collar. Q, QS and M size do not use half round rings.
SECTION TSM 151.2 ISSUE B PAGE 4 OF 14

6. Carefully remove rotor and shaft to avoid damaging
bracket bushing.
7. Remove packing gland from side of bracket.
8. Loosen four setscrews over the inner and outer end
caps. Remove both end caps with lipseals, spacer
collars and ball bearing. Refer to Figure 4.
The inner cap can be removed through the side opening
of the bracket.
9. Remove packing and packing retainer washer.
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 non-detergent SAE 30-weight oil and
check for roughness. Roughness can be determined
by turning outer race by hand.
If bearings have roughness, bearings will need to be
replaced.
11. Casing can be checked for wear or damage while
mounted on bracket.
ASSEMBLY
1. Install bracket bushing. If bracket bushing has a
lubrication groove, install bushing with groove at 6:00
o’clock position in bracket. If carbon graphite, refer to
INSTALLATION OF CARBON GRAPHITE BUSHINGS,
page 12.
2. Coat shaft of rotor shaft assembly with non-detergent SAE
30 weight oil. Start end of shaft in bracket bushing turning
from right to left, slowly pushing rotor in casing.
3. Place packing retainer washer in bottom of packing
chamber and pack pump with new packing. 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. A length of pipe will help to seat each packing
ring.
4. Install packing gland, capscrews and nuts Back rotor and
shaft out of casing just far enough to insert packing gland
through side opening of bracket over end of shaft. Make
sure gland is installed square and nuts are tightened
evenly. Tighten nuts wrench tight then back off until gland
is slightly loose.
5. Coat idler pin with non-detergent SAE 30 weight oil and
place idler and bushing on idler pin in head. If replacing
carbon graphite bushing, refer to INSTALLATION OF
CARBON GRAPHITE BUSHINGS, page 12.
SECTION TSM 151.2 ISSUE B PAGE 5 OF 14
FI
GU
RE 4
BALL BEARIN
G
INNER LIP
SEAL
SHAFT
BRACKET
OUTER SPACER
COLLAR
OU
TER LIP
S
EAL
INNER SPACER
COLLAR
HALF ROUND
RINGS
INNER END CAP
NYLON INSERT
G
REA
S
E FITTIN
G
L
OC
ATI
O
N
OU
TER END
C
AP
SETSCREWS
L
OC
KWA
S
HE
R
L
OC
KN
U
T

SECTION TSM 151.2 ISSUE B PAGE 6 OF 14
6. Using a 0.15-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 and equal distance between port
connections to allow for proper flow of liquid through
pump.
If pump is equipped with jacketed head plate, install at
this time along with new gasket.
Tighten head capscrews evenly.
If pump was equipped with a relief valve and it was
removed during disassembly, install on head with new
gaskets. Relief valve adjusting screw cap must always
point toward suction port. Refer to Figures 1 and 2 on
page 1. For relief valve repair or adjustments, refer to
PRESSURE RELIEF VALVE INSTRUCTIONS, page
13.
7. Slide inner spacer collar over shaft with recessed end
facing rotor. Q, QS and M 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 Q, QS
and M size pumps. Refer to Figure 4, page 5.
8. Press lip seal, lip facing end of shaft, in inner end cap
and insert end cap through shaft end of bracket. Turn
end cap clockwise, looking at shaft end, until it engages
threads. End cap spanner wrench holes must be facing
Rotor. Turn end cap with spanner wrench until it
projects slightly from opening on side of bracket. End
cap must not be turned so far that lip seal drops off end
of spacer collar on shaft or end cap becomes
disengaged from threads. Refer to Figure 4, page 5.
9. Pack ball bearing with multi-purpose grease, NLGI #2.
Place on shaft and push or gently drive in place in
bracket.
10. Press lip seal, lip facing end of shaft, in outer end cap
and insert end cap in bracket. Turn end cap in bracket
until it is tight against bearing. Refer to Figure 4, page
5.
11. 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 170-
190 ft – lbs. Torque. 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 rest of pump.
Remove length of hardwood or brass from port opening.
12. Adjust pump end clearance. Refer to THRUST
BEARING ADJUSTMENT, page 12.
13. Lubricate all grease fittings with multi-purpose grease,
NLGI #2.
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.

ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1 Locknut 14 Mechanical Seal 27 Rotor and Shaft
2 Lockwasher 15 Set Collar 28 Idler and Bushing
3 End Cap, Outer 16 Grease Fitting 29 Idler Bushing
4 Lip Seal for End Cap 17 Pipe Plug 30 Head Gasket
5 Bearing Spacer Collar, Outer 18 Bracket and Bushing 31 Idler Pin
6 Ball Bearing 19 Capscrew for Bracket 32 Head and Idler Pin
7 Bearing Spacer Collar, Inner 20 Bracket Bushing 33 Gasket for Jacket Head Plate
8 Ring, Half Round 21 Bracket Gasket 34 Jacket Head Plate
9 End Cap, Inner 22 Casing 35 Capscrew for Head
10 Nut for Seal Holder 23 Nut for Flanges 36 Relief Valve Gasket
11 Capscrew for Seal Holder 24 Capscrew for Flanges 37 Capscrew for Relief Valve
12 Seal Plate 25 Pipe Flange Gasket 38 Internal Relief Valve
13 Seal Holder 26 Pipe Plug 39 Cover Plate, Relief Valve
EXPLODED VIEW MODEL LS4123
ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1 Locknut 13 Set Collar 25 Rotor and Shaft
2 Lockwasher 14 Pipe Plug 26 Idler and Bushing
3 End Cap, Outer 15 Grease Fitting 27 Idler Bushing
4 Lip Seal for End Cap 16 Bracket and Bushing 28 Head Gasket
5 Bearing Spacer Collar 17 Capscrew for Bracket 29 Idler Pin
6 Ball Bearing 18 Bracket Bushing 30 Head and Idler Pin
7 End Cap, Inner 19 Bracket Gasket 31 Stud for Head
8 Nut for Seal Holder 20 Stud for Flanges 32 Nut for Head
9 Capscrew for Seal Holder 21 Nut for Flanges 33 Relief Valve Gasket
10 Seal Holder Plate 22 Casing *34 Capscrew for Relief Valve
11 Seal Holder 23 Pipe Flange Gasket 35 Internal Relief Valve
12 Mechanical Seal 24 Pipe Plug Flush line, Not illus.
*QS Casing has Opposite ports
EXPLODED VIEW Q, QS AND M4123
SECTION TSM 151.2 ISSUE B PAGE 7 OF 14
MECHANICAL SEAL PUMPS

PAGE 8 OF 14ISSUE B
SECTION TSM 151.2
DANGER
BEFORE OPENING ANY VIKING PUMP
LIQUID CHAMBER (PUMPING CHAMBER,
RESERVOIR, RELIEF VALVE ADJUSTING
CAP FITTING, ETC.) BE SURE:
1. THAT ANY PRESSURE IN CHAMBER
HAS BEEN COMPLETELY VENTED
THROUGH 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 THE ABOVE LISTED
PRECAUTIONARY MEASURES MAY
RESULT IN SERIOUS INJURY OR DEATH.
DISASSEMBLY
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 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
13.
If LS pump has jacketed head plate, it will separate from
head when it is removed. The gasket between head and
j
acket head plate must be totally removed. Use new
gasket when assembling pump. Q, QS and M pumps
have jacketed plate welded to head.
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.
Remove length of hardwood or brass from port opening.
4. Standard Mechanical Seal (synthetic rubber bellows
type) uses a set collar behind the seal spring. Two
setscrews must be loosened before shaft can be
removed Access to collar setscrews is through seal
access hole on right-hand side of mounting bracket
(viewed from shaft end. Refer to Figure 5.)
5. Tap shaft forward approximately 0.50 inch and remove
pair of half round rings under inner spacer collar. There
is no pair of half round rings on Q, QS and M size
pumps. Refer to Figure 6.
6. Carefully remove rotor and shaft to avoid damaging
bracket bushing.
7. Remove seal holder and seal holder plate.
8. The seal seat and rotary member of the seal can now
be removed from the side opening of bracket.
9. Loosen the four setscrews over the outer and inner end
caps. Remove both end caps, spacer collars and ball
bearing. Refer to Figure 6. The inner end cap can be
removed through the side openings in the bracket.
10. Clean all parts thoroughly and examine for wear or
damage. Check lip seals, ball bearing, bushing 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 non-detergent SAE 30-weight oil and
check for roughness. Roughness can be determined by
turning outer race by hand.
Be sure shaft is free from nicks, burrs and foreign
particles that might damage bracket bushing. Scratches
on shaft in seal area will provide leakage paths under
mechanical seal.
11. Casing can be checked for wear or damage while
mounted on bracket.

SECTION TSM 151.2 ISSUE B PAGE 9 OF 14
FIGURE 5
–
STANDARD MECHANICAL SEAL
FIGURE 6
ASSEMBLY
Standard Mechanical Seal
(Synthetic Rubber Bellows Type)
The seal used in this pump is simple to install and good
performance will result if care is taken during installation.
The principle of the mechanical seal is contact between the
rotary and stationary members. These parts are lapped to a
high finish and their sealing effectiveness depends on
complete contact.
A number of heavy-duty pumps are furnished with special
mechanical seals. These special seals are not discussed in
TSM 151.2. Information is available by contacting the
factory. When requesting special seal information, be sure
to give pump model number and serial number.
1. Install bracket bushing. If bracket bushing has a
lubrication groove, install bushing with groove at 6:00
o’clock position in bracket. If carbon graphite, refer to
INSTALLATION OF CARBON GRAPHITE BUSHINGS,
page 12.
2. Coat rotor shaft with non-detergent SAE 30 weight oil.
Start end of shaft in bracket bushing and turn from right
to left, slowly pushing until the ends of the rotor teeth
are just below the face of the casing.
3. Using a .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 and equal distance
between port connections to allow for proper flow of
liquid through pump.
If pump is equipped with jacketed head plate, install at
this time along with new gasket.
Tighten head capscrews gently.
If pump is equipped with a relief valve and it was
removed during disassembly, install on head with new
gaskets. Relief valve adjusting screw cap must always
point toward suction port. Refer to Figures 1 and 2 on
page 1. For relief valve repair or adjustments, refer to
PRESSURE RELIEF VALVE INSTRUCTIONS, page
13.
4. Clean rotor shaft and bracket seal housing bore. Be
sure they are free of dirt, grit and scratches. Gently
radius leading edge of shaft diameter over which seal
must be placed.
5. Install seal set collar. Examine set collar for burrs or
scratches, and setscrews are withdrawn to prevent shaft
from being scratched when set collar is installed. Place
set collar onto shaft, push into seal chamber until
centerline of setscrews coincides with centerline of
tapped seal access holes on right side of bracket
(viewed from shaft end). Tighten all setscrews securely
to shaft. Refer to Figure 7.
SE
T
COLLA
R
SEAL
SEAT
SPRING ADAPTE
R
SEAL ACCESS HOLE
(
FOR SETSCREWS
)
MECHANICAL SEAL
(
ROTARY MEMBER
)
SEAL SEAT GASKE
T
SEAL HOLDE
R
SEAL HOLDER
PLATE
RIGHT SIDE
OF PUMP
GREASE FITTING LOCATION
SETSCREWS
OUTER END CAP
LOCKWASHE
R
LOCKNU
T
BRACKE
T
OUTER LIP SEAL
OUTER SPACER
CO
LLA
R
SHAFT
INNER SPACE
COLLAR
HALF ROUN
D
RIN
GS
INNER
END CAP
NYLON INSER
T
INNER LIP
S
EAL
BALL BEARING

6. Sealing faces on mechanical seals should not be
touched with anything but fingers or a clean cloth. A
tapered sleeve is available, at extra cost, for Q, QS and
M pumps from Viking Pump Division for seal installation
on shaft. Refer to Figure 8. LS pump shaft is tapered
and an installation sleeve is not available.
7. Install rotating member of seal. Slide spring over shaft
into seal chamber and onto set collar pilot. Center
spring adapter (Q, QS, M size only) against back of
metal retainer so spring will push against adapter and
not work itself over back of mechanical seal. Place
tapered sleeve on shaft. Refer to Figure 8. Apply a
liberal coating of SAE-30 non-detergent oil to large
diameter portion of shaft, tapered sleeve and to inside
diameter of seal rubber parts. Start rotary member,
carbon face out, onto shaft and push along shaft until
spring is centered against adapter.
Install Stationary Seal Seat. Lubricate outside diameter
of seal o-ring seat gasket and flush lapped face with
lube oil. Press stationary seat by installing seal holder
and secure to machined face of bracket with seal holder
plate. Tighten nuts securing seal holder evenly so seal
holder will not be distorted. Refer to Figure 7.
Remove tapered installation sleeve.
8. Slide inner spacer collar over shaft with recessed end
facing rotor. Q, QS and M 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 Q, QS
and M size pumps. Refer to Figure 6, page 9.
9. Press lip seal, lip facing end of shaft, in inner end cap
and insert end cap through shaft end of bracket. Turn
end cap clockwise, looking at shaft end of bracket, until
it engages threads. End cap spanner wrench holes
must be facing rotor. Turn end cap with spanner
wrench until it projects slightly from opening on side of
bracket. End cap must not be turned so far that lip seal
drops off end of spacer collar on shaft or end cap
becomes disengaged from threads. Refer to Figure 6,
page 9.
If this happens, remove inner spacer collar, half round
rings and end cap and start over at Step 8.
10. Pack ball bearing with multi-purpose grease, NLGI #2.
Place on shaft and push or gently drive in place in
bracket.
11. Press lip seal, lip facing end of shaft, in outer end cap and
insert end cap in bracket. Turn end cap in bracket until it
is tight against bearing. Refer to Figure 6, page 9.
12. 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 170-
190 - ft.lbs. torque. 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 rest of pump. Remove
length of hardwood or brass from port opening.
13. Adjust pump end clearance. Refer to Thrust Bearing
Adjustment, page 12.
14. Lubricate all grease fittings with multi-purpose grease,
NLGI #2.
SECTION TSM 151.2 ISSUE B PAGE 10 OF 14
FI
GU
RE
8
FIGURE 7
–
STANDARD MECHANICAL SEAL
SET COLLA
R
SEAL
S
EAT
SEAL HOLDER
PLATE
SEAL HOLDE
R
SEAL SEAT GASKET
SEAL ACCESS HOLE
(
FOR SETSCREWS
)
SPRING ADAPTE
R
MECHANICAL SEAL
(
ROTARY MEMBER
)
RIGHT SIDE
OF PUMP
COAT WITH LIGHT OIL
BEF
O
RE A
SS
EMBL
Y
TAPERED SLEEVE
SPRING MECHANCIAL SEAL
(ROTARY MEMBER)

SECTION TSM 151.2 ISSUE B PAGE 11 OF 14
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
Optional Mechanical Seal
(Teflon Fitted Type)
The seal type shown in Figure 9 can be installed as an
alternative to the standard mechanical seal (synthetic rubber
bellows type). This seal is setscrew driven, is simple to
install and good performance will result if care is taken
during installation.
Clean rotor shaft and seal housing bore. Make sure they are
free of dirt, grit and scratches. Gently radius leading edge of
shaft diameter over which seal is to be placed.
A
tapered sleeve is available, at extra cost, for Q, QS and M
pumps from Viking Pump Division for seal installation on
shaft. LS size pump shaft is tapered and installation sleeve
is not available. Place tapered sleeve on shaft, refer to
Figure 10.
Never touch sealing faces with anything except clean hands
or clean cloth. Minute particles can scratch the seal faces
and cause leakage.
Coat tapered sleeve and inside of the rotary member with a
generous quantity of SAE 30 non-detergent oil. Grease is
not recommended. Start rotary member on shaft and over
tapered sleeve.
Move rotary member so setscrews are directly below seal
access holes on left side of bracket (viewed from shaft end)
Refer to Figure 9. Tighten all setscrews securely to shaft.
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. Assemble other seal
seat gasket, seal holder, seal holder plate capscrews and
nuts and tighten securely. Remove tapered installation
sleeve.
Some Teflon seals are equipped with holding clips, which
compress the seal springs. Remove holding clips to release
springs after seal is installed on shaft.
AT THIS POINT, FINISH ASSEMBLY PROCEDURE
STARTING AT STEP 8, PAGE 10 (STANDARD
MECHANICAL SEAL).
FI
GU
RE 1
0
FIGURE 9
–
OPTIONAL MECHANICAL SEAL
SEAL ACCESS HOLE
(
FOR SETSCREWS
)
SEAL SEAT GASKET SEAL HOLDER
PLATE
SEAL HOLDE
R
SEAL SEAT
MECHANICAL SEAL
(ROTARY MEMBER)
LEFT SIDE
OF PUMP
TAPERED INSTALLATION SLEEVE
MECHANICAL
S
EAL R
O
TARY SHAFT

SECTION TSM 151.2 ISSUE B PAGE 12 OF 14
THRUST BEARING ADJUSTMENT
Refer to FIGURE 12.
1. Loosen two setscrews over each outer and inner end
caps.
2. Turn inner end cap clockwise (viewed from shaft end)
until it projects slightly into opening on side of bracket
exposing approximately three threads.
3. Turn outer end cap clockwise until rotor is tight against
head and rotor shaft cannot be turned.
4. Make reference mark on bracket end, opposite notch on
outer end cap. Back off outer end cap required number
of notches as shown in Total End Clearance Chart.
Refer to Figure 11. Each notch represents .002” end
clearance.
5. High viscosity liquids require additional end clearances.
The amount of extra end clearance depends on
viscosity of liquid pumped. For specific
recommendations consult factory.
6. Tighten inner end cap with a spanner wrench. Tap
spanner wrench lightly but DO NOT OVER-TIGHTEN,
as it will damage threads.
7. Tighten setscrews that hold inner and outer end caps to
prevent their turning in bracket.
8. Check rotor to determine if it turns freely; if it does not,
add more end clearances.
FI
GU
RE 11
TOTAL END CLEARANCE CHART
PUMP SIZE TURN OUTER END CAP
COUNTER-CLOCKWISE NO.
OF NOTCHES
TOTAL
END
CLEARANCE
LS 2.5 0.005
Q, QS AND M 5 0.01
FIGURE 12
INSTALLATION OF CARBON
GRAPHITE BUSHINGS
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 750º F.
2. Install cool bushings with a press.
3. If facilities are not available to reach 750º F.
temperature, it is possible to install with 450º F.
temperature; however, the lower the temperature, the
greater the possibility of cracking bushing.
Consult factory with specific questions on high temperature
applications. Refer to Engineering Service Bulletin ESB –3.
GREASE FITTING LOCATION
SETSCREWS
OUTER END CAP
LOCKWASHE
R
LOCKNUT
OUTER SPACE
R
COLLAR
OUTER LIP
S
EAL
BRACKET
BALL BEARING
INNER LIP
SEAL
INNER
SPACER
COLLAR
HALF ROUND
RIN
GS
INNER
END
C
AP
NYLON INSERT

PRESSURE RELIEF VALVE
INSTRUCTIONS
FIGURE 13
SIZE LS
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
DISASSEMBL
Y
SECTION TSM 151.2 ISSUE B PAGE 13 OF 14
FIGURE 14
SIZE Q, QS AND M
DANGER
BEFORE OPENING ANY VIKING PUMP LIQUID
CHAMBER (PUMPING CHAMBER,
RESERVOIR, RELIEF VALVE ADJUSTING CAP
FITTING, ETC.) BE SURE:
1. THAT ANY PRESSURE IN CHAMBER HAS
BEEN COMPLETELY VENTED THROUGH
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 THE 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 Figures 13 and 14.
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.

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.
PRESSURE ADJUSTMENT
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
adjustment operation.
3. Turn adjusting screw in to increase pressure and out to
decrease pressure.
4. With discharge line closed at a point beyond pressure
gauge, gauge will show maximum pressure valve will
allow while pump is in operation.
IMPORTANT
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.
WARRANTY
Viking warrants all products manufactured by it to be
free from defects in workmanship or material for a
period of one (1) year from date of startup, provided
that in no event shall this warranty extend more than
eighteen (18) months from the date of shipment from
Viking. If, during said warranty period, any products
sold by Viking prove to be defective in workmanship o
r
material under normal use and service, and if such
products are returned to Viking’s factory at Cedar Falls,
Iowa, transportation charges prepaid, and if the
products are found by Viking to be defective in
workmanship or material, they will be replaced o
r
repaired free of charge, FOB. Cedar Falls, Iowa.
Viking assumes no liability for consequential
damages of any kind and the purchaser by acceptance
of delivery assumes all liability for the consequences o
f
the use or misuse of Viking products by the purchaser,
his employees or others. Viking will assume no field
expense for service or parts unless authorized by it in
advance.
Equipment and accessories purchased by Viking
from outside sources, which are incorporated into an
y
Viking product, are warranted only to the extent of and
by the original manufacturer’s warranty or guarantee, i
f
any.
THIS IS VIKING’S SOLE WARRANTY AND IS IN
LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, WHICH ARE
HEREBY EXCLUDED, INCLUDING IN
PARTICULAR ALL WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR
A
PARTICULAR PURPOSE. No officer or employee
of IDEX Corporation or Viking Pump, Inc. is
authorized to alter this warranty.
VIKING PUMP INC.∙
A Unit of IDEX Corporation VIKING PUMP INC.∙ Copyright 2000∙
ASSEMBL
Y
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. Refer to Figures 1 and 2,
page 1
TECHNICAL SERVICE MANUAL
HEAVY-DUTY STEEL EXTERNAL BRACKET MOUNTED PUMPS
SERIES 123 AND 4123
SIZES LS, Q, QS, M
SECTION TSM 151.2
PAGE 14 OF 14
ISSUE B