Viking Pump TSM161.3 User Manual

Electronic copies of the most current TSM issue can be found on the Viking Pump website at www.vikingpump.com

TECHNICAL SERVICE MANUAL

HEAVY-DUTY STAINLESS STEEL BRACKET

CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . 1

Special Information . . . . . . . . . . . . . . . . . . . 2

Maintenance . . . . . . . . . . . . . . . . . . . . . . 3

Packed Pumps . . . . . . . . . . . . . . . . . . . . . 4

Mechanical Seal Pumps . . . . . . . . . . . . . . . . 7

Thrust Bearing Adjustment . . . . . . . . . . . . . . .11

Installation of Carbon Graphite Bushings . . . . . . . .11

Pressure Relief Valve Instructions . . . . . . . . . . . 11

INTRODUCTION

The illustrations used 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
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 are
combined with series number (127 and 4127) and used to
indicate either an unmounted pump or mounted pump unit.

MOUNTED PUMPS

SERIES 127 AND 4127

SIZES LS, Q, QS, M

SECTION TSM 161.3

PAGE 1 Of 12

ISSUE D

FIGURE 1

Size LS

UNMOUNTED PUMP UNITS

PACKED MECH. SEAL

LS127 LS4127

Q127 Q4127

QS127 QS4127

M127 M4127

This manual deals only with Series 127 and 4127 Heavy Duty
Stainless Steel Bracket Mounted Pumps. Refer to Figures 1
through 10 for general configuration and nomenclature used
in this manual. Pump specifications and recommendations
are listed in Catalog Section 161, Series 127 and 4127 Heavy
Duty Bracket Mounted Pumps.

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

FIGURE 2

Sizes Q, QS and M

VIKING PUMP, INC. • A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA

SPECIAL INFORMATION

DANGER !

Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
relief valve adjusting cap fitting, etc.)
Be sure:

For additional information on pressure relief valves, Refer
to Technical Service Manual TSM000 and Engineering
Service Bulletin ESB-31.

SPECIAL MECHANICAL SEALS

Extra care must be taken in repair of pumps with mechanical
seals. Read and follow all special information supplied with
pump.

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.

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. Refer to Figures 1 and 2.

5. Pressure relief valves cannot be used to control pump
flow or regulate discharge pressure.

MAINTENANCE

Series 127 and 4127 pumps are designed for long, trouble­free 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 over­grease. 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 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 non­detergent 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 127 and 4127 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. AlIen 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
Viking Part No. 2-751-005-630 for 2.4375 inch seal;
Q-M4127

5. Bearing locknut spanner wrench
(Source: #472 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

SECTION TSM 161.3 ISSUE D PAGE 2 OF 12

PACKED PUMPS

IDLER

ROTOR

HEAD

PACKING

PACKING GLAND

BRACKET

SHAFT

IDLER PIN

CASING

FIGURE 3

CUTAWAY VIEW OF PACKED PUMP MODEL Q OR M127 WITH CALLOUTS (QS CASING HAS OPPOSITE PORTS)

EXPLODED VIEW OF MODEL LS127

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 Jacket Head Plate

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

13 Packing 26 Idler and Bushing

SECTION TSM 161.3 ISSUE D PAGE 3 OF 12

EXPLODED VIEW FOR MODELS Q, QS AND M127

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 (QS size has opposite ports) 32 Capscrew for Relief Valve

9 Packing Gland Nut 21 Pipe Flange Gasket 33 Internal Relief Valve

10 Packing Gland Capscrew 22 Pipe Plug 34 Cover Plate, Relief Valve

11 Packing 23 Rotor and Shaft

12 Packing Retainer Washer 24 Idler and Bushing

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.

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 10.

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 0.5 inch and remove

pair of half round rings under inner bearing spacer collar.
Q, QS and M size to not use half round rings.

6. Carefully remove rotor and shaft to avoid damaging
bracket bushing.

7. Remove packing gland from side of bracket.

SECTION TSM 161.3 ISSUE D PAGE 4 OF 12

GREASE FITTING LOCATION

NYLON INSERT

INNER END CAP

HALF ROUND RINGS

INNER SPACER COLLAR

INNER LIP SEAL

SETSCREWS

OUTER END CAP

LOCKWASHER

LOCKNUT

SHAFT

OUTER SPACER COLLAR

OUTER LIP SEAL

BALL BEARING

FIGURE 5

8. Loosen four setscrews over the inner and outer end caps.

Remove both end caps with lip seals, spacer collars and
ball bearing. Refer to Figure 4.

The inner cap can be removed through 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 10.

BRACKET

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
with carbon graphite bushing, Refer to Installation of

Carbon Graphite Bushings, page 10.

6. 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.

SECTION TSM 161.3 ISSUE D PAGE 5 OF 12

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 Vavle Instructions, Page 10.

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.

If this happens, remove inner spacer collar, half round

rings and end cap and start over at Step 7.

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 Iockwasher and locknut on shaft. Insert length of
hardwood or brass through port opening between rotor
teeth to keep shaft from turning. Tighten locknut to 120­150 ft.-lbs. Torque (LS) or 170-190 ft.-lbs. Torque (Q,
QS, M). 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 10.

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.

EXPLODED VIEW FOR MODEL LS4127

ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART

1 Locknut 14 Mechanical Seal 27 Idler and Bushing

2 Lockwasher 15 Grease Fitting 28 Idler Bushing

3 End Cap (Outer) 16 Pipe Plug 29 Head Gasket

4 Lip Seal for End Cap 17 Bracket and Bushing 30 Idler Pin

5 Bearing Spacer Collar (Outer) 18 Capscrew for Bracket 31 Head and Idler Pin

6 Ball Bearing 19 Bracket Bushing 32 Gasket for Jacket Head Plate

7 Bearing Spacer Collar (Inner) 20 Bracket Gasket 33 Jacket Head Plate

8 Ring, Half Round 21 Casing 34 Capscrew for Jacket Head Plate

9 End Cap (Inner) 22 Nut for Flanges 35 Relief Valve Gasket

10 Nut for Seal Holder 23 Capscrew for Flanges 36 Capscrew for Relief Valve

11 Capscrew for Seal Holder 24 Pipe Flange Gasket 37 Internal Relief Valve

12 Seal Plate 25 Pipe Plug 38 Cover Plate, Relief Valve

13 Seal Holder 26 Rotor and Shaft 39

SECTION TSM 161.3 ISSUE D PAGE 6 OF 12

EXPLODED VIEW FOR MODELS Q, QS AND M127

ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART

1 Locknut 13 Pipe Plug 25 Idler and Bushing

2 Lockwasher 14 Grease Fitting 26 Idler Bushing

3 End Cap (Outer) 15 Bracket and Bushing 27 Head Gasket

4 Lip Seal for End Cap 16 Capscrew for Bracket 28 Idler Pin

5 Bearing Spacer Collar 17 Bracket Bushing 29 Head and Idler Pin

6 Ball Bearing 18 Bracket Gasket 30 Stud for Head

7 End Cap (Inner) 19 Stud for Flanges 31 Nut for Head

8 Nut for Seal Holder 20 Nut for Flanges 32 Relief Valve Gasket

9 Capscrew for Seal Holder 21 Casing (QS size has opposite ports) 33 Capscrew for Relief Valve

10 Seal Holder Plate 22 Pipe Flange Gasket 34 Internal Relief Valve

11 Seal Holder 23 Pipe Plug Cover Plate, Relief Valve

12 Mechanical Seal 24 Rotor and Shaft

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.

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 10.

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. Standard Mechanical Seal (PTFE fitted type) is setscrew
driven. Setscrews in rotary member must be loosened
before shaft can be removed. Access to collar setscrews
is through seal access hole on left hand side of mounting
bracket (viewed from shaft end, Refer to Figure 5.)

SECTION TSM 161.3 ISSUE D PAGE 7 OF 12

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 7, page 5.

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 4, page 5. 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.

LEFT SIDE
OF PUMP

SEAL ACCESS HOLE (FOR SETSCREWS)

MECHANICAL SEAL (ROTARY MEMBER)

SEAL SEAT

SEAL HOLDER

ASSEMBLY

Standard Mechanical Seal
(PTFE Fitted 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
TSM161.3. 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 10.

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 evenly.

If pump was equipped with a relief valve and it was
removed during disassembly, install a head with new
gaskets. Relief valve adjusting screw cap must always
point toward suction port. Refer to Figures 1 and 2,

page 1. For relief valve repair or adjustments, Refer to
Pressure Relief Valve Instructions, page 10.

TAPERED INSTALLATION SLEEVE

SEAL SEAT GASKET

FIGURE 5 - PTFE FITTED MECHANICAL SEAL

SECTION TSM 161.3 ISSUE D PAGE 8 OF 12

SEAL
HOLDER
PLATE

MECHANICAL SEAL
ROTARY MEMBER

FIGURE 6

SHAFT

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. 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 6.

6. 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.

7. Move rotary member so setscrews are directly below
seal access holes on left side of bracket (viewed from
shaft end) Refer to Figure 5. 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 PTFE seals are equipped with holding clips which
compress the seal springs. Remove holding clips to
release springs after seal is installed on shaft.

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 7.

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, 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 7.

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 7.

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 120­150 ft.– lbs. Torque (LS) or 170-190 ft. – lbs. Torque (Q,
QS, M). 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.

13. Adjust pump end clearance. Refer to Thrust Bearing
Adjustment, page 10.

14. 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.

GREASE FITTING

NYLON INSERT

INNER

END CAP

HALF ROUND
RINGS

INNER SPACER
COLLAR

INNER

LIP SEAL

BALL BEARING

FIGURE 7

SETSCREWS

OUTER END CAP

LOCKWASHER

LOCKNUT

OUTER
SPACER
COLLAR

OUTER LIP

SEAL

BRACKET

SECTION TSM 161.3 ISSUE D PAGE 9 OF 12

THRUST BEARING ADJUSTMENT

Refer to Figure 7.

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 a reference mark on bracket end, opposite a
notch on outer end cap. Back off outer end cap required
number of notches as shown in Total End Clearance
Chart. Refer to Figure 8. Each notch represents .002”
end clearance.

5. High viscosity liquids require additional end clearances.
The amount of extra end clearance depends on
the viscosity of the liquid pumped. For specific
recommendations contact 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 set screws 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 clearance.

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 750 ° F.

2. Install cool bushings with a press.

3. If facilities are not available to reach 750 °F. temperature,

it is possible to install with 450 °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.

PRESSURE RELIEF VALVE
INSTRUCTIONS

TOTAL END CLEARANCE CHART

PUMP

SIZE

LS 2.5 0.010

Q, QS AND M 5 0.010

TURN OUTER END CAP
COUNTER-CLOCKWISE

NO. OF NOTCHES

FIGURE 8

TOTAL

END

CLEARANCE

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.

FIGURE 9

Size LS

FIGURE 10

Sizes Q, QS and M

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

SECTION TSM 161.3 ISSUE D PAGE 10 OF 12

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.

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 the valve will
allow while pump is in operation.

IMPORTANT

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 9 and 10.

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 as necessary.

ASSEMBLY

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.

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.

SECTION TSM 161.3 ISSUE D PAGE 11 OF 12

TECHNICAL SERVICE MANUAL

HEAVY-DUTY STAINLESS STEEL BRACKET

MOUNTED PUMPS

SERIES 127 AND 4127

SIZES LS, Q, QS, M

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. The warranty period for Universal Seal series
pumps ONLY (Universal Seal models listed below) is
three (3) years from date of startup, provided that in
no event shall this warranty extend more than forty-two
(42) months from the date of shipment from Viking.

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.

THIS WARRANTY IS AND SHALL BE VIKING’S SOLE
AND EXCLUSIVE WARRANTY AND SHALL BE 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-INFRINGEMENT ALL OF WHICH OTHER
WARRANTIES ARE EXPRESSLY EXCLUDED.

See complete warranty at www.vikingpump.com.

SECTION TSM 161.3

PAGE 12 OF 12

ISSUE D

VIKING PUMP, INC. • A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA

© 3/2013 Viking Pump Inc.
All rights reserved