Viking KK825, K-825, KK823, K-827, KK827 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

MAGNETIC DRIVE PUMPS

SERIES 823 – STEEL

825 – CAST IRON

827 – STAINLESS STEEL

SIZES K & KK

SECTION TSM 845

PAGE 1 Of 14

ISSUE f

CONTENTS

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

Safety Information. . . . . . . . . . . . . . . . . . . . 2

Special Information . . . . . . . . . . . . . . . . . . . 3

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

Disassembly: Pump. . . . . . . . . . . . . . . . . . . 4

Disassembly: Coupling . . . . . . . . . . . . . . . . . 6

Disassembly & Assembly

of MD-C Series Bearing Housing . . . . . . . . . . 8

Installation of Bushings . . . . . . . . . . . . . . . . .10

Assembly: Coupling. . . . . . . . . . . . . . . . . . .10

Adjusting Head Gasket End Clearance . . . . . . . . .11

Pump Rotation . . . . . . . . . . . . . . . . . . . . 11

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

Troubleshooting. . . . . . . . . . . . . . . . . . . . .13

Warranty . . . . . . . . . . . . . . . . . . . . . . . .14

WARNING !

Persons with surgical implants of a
metallic or electronic nature should
avoid working on pump – especially the
inner magnet assembly.

Model Number Chart

UNMOUNTED UNITS

Units are designated by the

K-823 , 825 , 827

KK823 , 825 , 827

This manual deals only with Series 823, 825 and 827 magnetic
drive pumps and couplings. Refer to Figures 1 thru 23
for general configuration and nomenclature used in this
manual. Pump specifications and recommendations are
listed in Catalog Section 845.

unmounted pump model numbers
followed by a letter(s) indicating
drive style.

B = Bracket Mount
R = Viking Reducer Drive
P = Commercial Speed Reducer
(Example: KK-827-MD-C80R)

TABLE 1

INTRODUCTION

The illustrations used in this manual are for identification
purposes only and should not be used for ordering parts.
Secure a parts list from the factory or a Viking® representative.
Always give complete name of part, part number or material
with model number and serial number of pump when ordering
repair parts. The unmounted pump or pump unit model
number and serial number can be found on the nameplate.

In the Viking® model number system, the basic size letters
are combined with the series (823, 825, 827), indicating basic
pump construction material (steel, cast iron, or stainless steel
respectively). See Model Number Chart.

FIGURE 1
K & KK-827 (stainless steel) MD-C80 B
Bearing Carrier, Footed Bracket and
Mounted Pump with Flanged Ports.

FIGURE 2
K & KK-825 (cast iron) MD-C80 R
Unit complete with Motor, “B”
Gear Reducer, Bearing Carrier
mounted to base with Mounted
Pump featuring Tapped Ports.

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

SAFETY INFORMATION

INCORRECT INSTALLATION, OPERATION OR MAINTENANCE OF EQUIPMENT MAY CAUSE SEVERE

PERSONAL INJURY OR DEATH AND/OR EQUIPMENT DAMAGE AND MAY INVALIDATE THE WARRANTY.

This information must be read fully before beginning installation, operation or maintenance and must be
kept with the pump. All installation and maintenance must be undertaken by suitably trained or qualified
persons only.

Warning - Safety instructions which

shall be considered for reasons of safe
operation of the pump or pump unit and/
or protection of the pump or pump unit
itself are marked by this symbol.

Symbol

Legend :

Danger - Failure to follow the listed

precautionary measures identified by
this symbol may result in serious injury

!

or death.

WARNING

!

!

!

!

!

WARNING

!

!

DO NOT OPERATE PUMP IF:

– The front cover is not installed correctly.

– Any guards are missing or incorrectly installed.

– The suction or discharge piping is not connected.

DO NOT place fingers, etc. 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. Severe injury will occur.

DO NOT exceed the pumps rated pressure, speed, and
temperature, or change the system/duty parameters
from those for which the pump was originally supplied,
without confirming its suitability for the new duty.

INSTALLATION AND OPERATION OF THE PUMP
MUST ALWAYS COMPLY WITH HEALTH AND
SAFETY REGULATIONS.

Rare earth magnets used in couplings have
extremely strong magnetic fields capable of
changing performance or damaging items such as:
Pacemakers, Metal Implants, Watches, Computers
& Disks, and Credit Cards

Completely assembled magnetic couplings will
not affect items listed above - only disassembled
components.

There are no known harmful effects of these
magnetic fields on the human body.

A device must be incorporated into the pump, system,
or drive to prevent the pump exceeding its stated duty
pressure. It must be suitable for both directions of
pump rotation where applicable. Do not allow pump
to operate with a closed/blocked discharge unless a
pressure relief device is incorporated. If an integral
relief valve is incorporated into the pump, do not allow
re-circulation through the relief valve for extended
periods.

The mounting of the pump or pump unit should be
solid and stable. Pump orientation must be considered
in relation to drainage requirements. Once mounted,
shaft drive elements must be checked for correct
alignment. Rotate pump shaft by at least one full
revolution to ensure smoothness of operation.
Incorrect alignment will produce excessive loadings
and will create high temperatures and increased noise
emissions. Do not use any drive arrangements which
cause sideloading of the drive shaft.

The installation must allow safe routine maintenance
and inspection (to check for leakage, monitor
pressures, etc) and provide adequate ventilation
necessary to prevent overheating.

WARNING

WARNING

WARNING

!

!

!

!

!

!

Before operating the pump, be sure that it and all
parts of the system to which it is connected are clean
and free from debris and that all valves in the suction
and discharge pipelines are fully opened. Ensure that
all piping connecting to the pump is fully supported
and correctly aligned with its relevant connections.
Misalignment and/or excess loads will cause severe
pump damage.

Be sure that pump rotation is correct for the desired
direction of flow.

DO NOT INSTALL THE PUMP INTO A SYSTEM
WHERE IT WILL RUN DRY (I.E. WITHOUT A
SUPPLY OF PUMPED MEDIA).

Pressure gauges/sensors are recommended, next
to the pump suction and discharge connections to
monitor pressures.

Caution must be taken when lifting the pump. Suitable
lifting devices should be used as appropriate. Lifting
eyes installed on the pump must only be used to lift
the pump, not pump with drive and/or baseplate. If
pump is baseplate mounted, the base plate must be
used for all lifting purposes. If slings are used for lifting,
they must be safely and securely attached. For weights
of bare shaft pumps refer to catalog.

DO NOT attempt any maintenance or disassembly of
the pump or pump unit without first ensuring that :

– The pump is fully isolated from the power source

(electric, hydraulic, pneumatic).

– The pumping chamber, relief valve and any

shaft seal support system are depressurized and
purged.

– Any temperature control devices (jackets, heat-

tracing, etc) are fully isolated, that they are
depressurized and purged, and components are
allowed to reach a safe handling temperature.

DO NOT attempt to dismantle a pressure relief valve
which has not had the spring pressure relieved or is
mounted on a pump that is operating. Serious personal
injury or death and/or pump damage may occur.

DO NOT loosen or undo the front cover, any
connections to the pump, shaft seal housings,
temperature control devices, or other components,
until sure that such action will not allow the unsafe
escape of any pressurized media.

Pumps and/or drives can produce sound power levels
exceeding 85 dB(A) under certain operating conditions.
When necessary, personal protection against noise
must be taken.

Avoid any contact with hot parts of pumps and/or
drives which may cause injury. Certain operating
conditions, temperature control devices (jackets, heat­tracing, etc.), bad installation, or poor maintenance
can all promote high temperatures on pumps and/or
drives.

SECTION TSM 845 ISSUE F PAGE 2 OF 14

SPECIAL INFORMATION

DANGER !

Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
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.
(See detailed procedure for venting
the pumps, pages 4, 5 and 6).

2. That the driving means (motor,
turbine, engine, etc.) has been
“locked out” or made otherwise non­operational so that it cannot be
inadvertently started while work is
being done on the pump.

DISCHARGE

SUCTION

RELIEF VALVE ADJUSTING SCREW CAP

FIGURE 3

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 Mag-Drive® pumps are designed to run
in the direction indicated on the nameplate only. If rotation
must be reversed, see “Pump Rotation” on page 10.

PRESSURE RELIEF VALVES:

1. Relief valves are mounted on the head of K and KK
size pumps. Relief Valves are not available on jacketed
heads.

2. If a Relief Valve is not furnished on the pump, some
means of over protection such as an in-line relief valve
should be provided. Do not rely on magnets decoupling
for protection from over pressure. This may result in
damage to magnets, pump or other equipment.

3. 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 (See “Pump Rotation” on page 10 for additional
steps required for proper operation). See Figure 3.

4. 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.

MAINTENANCE

CAUTION !

Rare earth magnets used in these
couplings have extremely strong
magnetic fields capable of changing the
performance or damaging items such as
the following:

Pacemakers
Metal Implants
Watches
Computers & discs
Credit Cards

Completely assembled magnetic
couplings will not affect items listed
above.

Altered performance or damage can
occur only when the coupling halves are
separated.

There are no known harmful effects of
these magnetic fields on the human
body.

Series 823, 825 and 827 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.

SECTION TSM 845 ISSUE F PAGE 3 OF 14

CLEANING PUMP: Keep pump as clean as possible. This
will facilitate inspection, adjustment and repair work.

STORAGE: If pump and coupling are to be stored, drain pump
and pour non-detergent SAE 30 weight oil into the pump port.
Apply grease to the pump or the coupling shaft extension, if
present or accessible. Viking suggests rotating pump shaft by
hand one complete revolution every 30 days to circulate the
oil. The coupling should be stored in a dry area.

Note: if the liquid to be pumped reacts with oil, use an
acceptable alternate.

SUGGESTED REPAIR TOOLS: The following tools are
required to properly repair Series 823, 825, and 827 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 face hammer

2. Allen wrenches

3. External Snap ring pliers - 2-810-029-375

4. Internal Snap ring pliers - 2-810-047-999

5. Feeler gauge set

6. Arbor Press

7. Brass Bar

8. Hand Knobs - 2-790-046-999 (2 Required)

9. Standard 5/16” 12 point socket

DANGER !

Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
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.

(See detailed procedure for venting

the pumps, pages 4, 5 and 6).

2. That the driving means (motor,
turbine, engine, etc.) has been
“locked out” or otherwise made non­operational so that it cannot be
inadvertently started while work is
being done on the 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.

DISASSEMBLY: PUMP

1. Refer to Figures 4, 5 & 6 for names of parts.

2. Mark head, casing, and bracket before disassembly to

insure proper reassembly. The idler pin, which is offset in
the pump head, must be positioned toward and an equal
distance from port connections to allow for proper flow of
liquid through the pump.

3. Remove the head capscrews.

CANISTER

O-RINGS

OUTER MAGNET

ASSEMBLY

BEARING
CARRIER

ASSEMBLY

CANISTER

Failure to follow above listed
precautionary measures may result in
serious injury or death.

BALANCE

PLATE

BRACKET

BUSHINGS

ROTOR

CASING

IDLER PIN

PRESSURE
RELIEF
VALV E

BRACKET

INNER MAGNET

ASSEMBLY

CUTAWAY VIEW MAG-DRIVE PUMP, MODEL KK-825 MD-80 B ILLUSTRATED

SECTION TSM 845 ISSUE F PAGE 4 OF 14

BRACKET

FIGURE 4

IDLER

HEAD

HEAD

GASKET

4. 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 set, all gaskets are
required to maintain end clearance.

5. Remove idler and bushing assembly. If idler bushing
needs replacing, see “Installation of Bushings”
page 9. If further disassembly is required pump must
be separated from coupling. Refer to “Disassembly:

Coupling,” on page 6, before proceeding with Step 6.

6. After inner magnet is removed then remove key and

external retaining ring from the shaft. Rotor and shaft
may now be extracted by tapping on end of the shaft
with a soft face hammer (if a soft faced hammer is
unavailable a regular hammer may be used with a piece
of hardwood).

7. Mark the location and orientation of the Balance plate
before removing by pulling out. (The balance plate may
not be removable in the 825 series).

The casing should be examined for wear, particularly in the
area between ports. All parts should be checked for wear
before pump is assembled.

When making major repairs, such as replacing a rotor and
shaft, it is advisable to also install a new head and idler pin,
idler and bushing, and casing bushings. See “Installation of

Bushings” on page 9.

Clean all parts thoroughly and examine for wear or damage.
Check bushings, idler pin and balance plate; replace if
necessary.

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

1 Bracket Gasket - Primary 10 Casing 19 Head Gasket

2 Bracket Gasket 11 Capscrew for Inner Magnet 20 Idler Pin

3 Orifice 12 Lockwasher 21 Head & Pin

4 Bracket 13 Washer 22 Pipe Plug

5 Capscrews for Casing 14 External Retaining Ring 23 Capscrews for Head

6 Casing Gasket 15 Key 24 Gaskets for Relief Valve

7 Bracket Bushings 16 Rotor & Shaft 25 Relief Valve

8 Balance Plate (Maybe Not in 825) 17 Idler Bushing 26 Capscrews for Relief Valve

9 Pipe Plugs 18 Idler & Bushing

FIGURE 5

K & KK MAG DRIVE PUMP

SECTION TSM 845 ISSUE F PAGE 5 OF 14

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

1 Capscrews 5 Ball Bearing (2 Req’d) 9 Bracket

2 External Snap Ring 6 Internal Snap Ring 10 Canister

3 Bearing Housing 7 Key 11 Inner Magnet Assembly

4 Bearing Spacer 8 Outer Mag Assembly 12 Hand Knobs

FIGURE 6

MD-C SERIES COUPLING

DISASSEMBLY: COUPLING

SERIES MD-C80 COUPLING

1. If unit has a spacer coupling then bracket of coupling

can stay bolted to base. Without spacer coupling, either
the reducer will need to be removed or the coupling
unbolting. Remove piping to pump, provide a minimum
of 4” of clearance beyond end of coupling shaft. Insert
(2) .5” U.N.C. handknobs which have a minimum of 4.5”
of full threads into the two tapped holes at 9 and 3.00
positions on the back of the bearing housing. Remove
the (4) .375 capscrews. See Figure 7.

.375” CAPSCREWS (4 REQ’D)

HAND KNOBS (2 REQ’D) 2-790-046-999

CAUTION !

Magnet sets are extremely powerful.
Serious injury may result if proper
procedures are not followed.

2. Turn the handwheels evenly to back out the bearing
housing and outer magnet assembly. See Figure 8.

FIGURE 8

FIGURE 7

SECTION TSM 845 ISSUE F PAGE 6 OF 14

CAUTION !

Do not attempt to pull the magnet sets
apart by hand until the outer has been
backed off 4”. Support the outer magnet
assembly and pull completely away from
the inner magnet. Be careful when setting
down this unit to avoid tools and other
metal objects being attracted to the end of
the magnet.

3. Support pump with hoist and remove the (4) .5” capscrews.
See Figure 9. Pull the pump out of the bracket; there will

be some resistance to pull apart since the inner magnet
assembly will be attracted to the coupling bracket. If
further disassembly of the bearing carrier is required,
refer to page 7. Since there will be some liquid left in
the canister, be aware that liquid will run out when the
canister separates from the pump. Remove canister if it
has not already come off the pump.

4. Insert a brass bar through a port between two rotor teeth
and loosen the capscrew holding the inner magnet to
the shaft (See Figure 11). Do not forget, this is a very
strong magnet. If pump disassembly is required, remove
the external retaining ring.

5. Do not remove the O-ring unless it is bad, especially

if PTFE (Derivative) encapsulated. If a new O-ring is
required, follow instructions in the “Assembly: Pump”

on page 7.

SECONDARY
O-RING

PRIMARY
O-RING

EXTERNAL
RETAINING
RING

WASHER

LOCK

WASHER

0.44”
CAPSCREW
WITH HOLE

INNER
MAGNET

CANISTER

0.5” CAPSCREWS (4 REQ’D)

FIGURE 9

0.44” CAPSCREW RIGHT
HAND THREADS

BRASS BAR

FIGURE 10

FIGURE 11

SECTION TSM 845 ISSUE F PAGE 7 OF 14

DISASSEMBLY & ASSEMBLY OF
MD-C SERIES BEARING HOUSING

DISASSEMBLY

The bearing housing features two sealed ball bearings along
with an outer magnet assembly. If further disassembly of this
unit is required, proceed as follows:

1. Refer to Figure 12 for part identification. Cover the open
end of the outer magnet with a piece sheet metal or
cardboard. This will keep foreign material out of magnet
area. Set the assembly face down with the shaft pointing
up and remove handknobs.

2. Remove external retaining ring from shaft, place unit
into press and push out shaft as shown in Figure 13.
Support end of outer magnet to prevent it from dropping
as possibly being damaged.

3. Remove the internal retaining ring and press out
bearings.

BEARING

INTERNAL

RETAINING

RING

HOUSING

SHEET METAL
COVER 6.50”
SQUARE

PRESS

FIGURE 13

SPACER

EXTERNAL

RETAINING

RING

BALL BEARINGS

FIGURE 12

ASSEMBLY

1. Place (1) bearing into housing bore. Gently tap or press

into bore. Position spacer in bore and insert second
bearing. Press down until bearings bottom out. Install
internal retaining ring into bearing housing.

2. Slide shaft of outer magnet assembly into bearing until
it meets resistance. Set upright in press (See Figure

14) and place a spacer on the end of housing such as
3” NPT coupling and press housing down until bearing
bottoms out on shaft shoulder. Install external retaining
ring on shaft of outer magnet assembly.

PRESS

SPACER
(3”NPT
COUPLING)

SECTION TSM 845 ISSUE F PAGE 8 OF 14

FIGURE 14

ASSEMBLY: PUMP

Use a suitable lubricant compatible with the fluid being
handled when reassembling the pump.

Inspect all parts, especially drilled holes in casing for the suck
back system to make sure they are not plugged. Replace any
worn parts and polish any burrs; clean all parts; assemble
pump.

1. If the canister O-rings need to be replaced, apply a
lubricant to the O-ring and place into the O-ring groove.
If the O-ring is PTFE (derivative) encapsulated, follow
these special instructions.

Do not attempt to reuse the primary O-ring if it has been
removed (and is PTFE derivative encapsulated). Immerse a
new O-ring in boiling water and stretch out O-ring so it will
fit onto casing hub without forcing over a sharp edge. Run
hot water over O-ring until it shrinks down tight onto the pilot
of the pump. Dry with compressed air. The secondary PTFE
derivative encapsulated O-ring can be placed in the bracket
groove with some lubricant.

2. If casing was removed from bracket, inspect flat
gasket and replace if necessary. Install casing onto
bracket pilot in the same orientation as before. This
series of pumps does not allow rotating the casing
to alternate port configurations – to modify the port
arrangement, Refer to “Pump Rotation” on page 10.

Secure the casing with (8) capscrews.

3. Place the balance plate (if separate from bracket) into
the casing bore (this step may not be required in the
825 series). Make sure plate is positioned the same as
before. Refer to Figure 15 for standard balance plate
positioning.

DISCHARGE

PORT

SUCTION

PORT

STANDARD POSITION
CW ROTATION AS
VIEWED FROM HEAD

GROOVE

5. If old gaskets are not reusable, refer to “Adjusting
Head Gasket End Clearance” on page 10. Otherwise,

place the head gaskets on the head. The proper amount
of gaskets should be used to provide the correct end
clearance. Table 2 gives the quantity of gaskets available
in a gasket set along with standard end clearance.

GASKET TABLE

NORMAL END

PUMP MODEL

K & KK 825 .008

K & KK 823, 827 .010

End clearances are adequate for viscosity’s up to 750 SSU
(SAE 20-lube oil at room temperature). Higher viscosity
liquids require additional end clearances.

CLEARANCE

(iNCH.)

TABLE 2

As a general guideline, for viscosity’s between 750 and
7500 SSU (heavier lube oils) double the amount of end
clearance indicated, for viscosity’s between 7500 and
25,000 SSU (e.g., resins) triple the amount indicated.

For specific recommendations for end clearances for
viscosity or for operating temperatures above 225ºF,
check with your Viking Representative or consult the
factory.

6. Coat the idler pin with a suitable lubricant and place the
idler on the idler pin in the head.

7. The head can now be assembled on the pump. Tilt the
top of the pump head away from the pump slightly until
the crescent enters the inside diameter of the rotor and
rotate the idler until its teeth mesh with the rotor teeth.
Pump head and casing should have been marked before
disassembly to insure proper reassembly. If not, be sure
idler pin, which is offset in the pump head, is positioned
toward and an equal distance from port connections to
allow for proper flow of liquid through the pump.

8. Install relief valve if provided and removed. Valve cap
should point to Suction side of the pump (See Figure 3

on page 2).

9. Place key and external retaining ring onto shaft then

follow instruction listed for assembling to the coupling.

SET OF GASKETS

CONSISTS OF THE

FOLLOWING

(1) .015
(2) .007
(3) .005

FIGURE 15

4. Clean rotor and shaft so it is free of dirt, grit and other

debris and apply lubricant. Push into casing and bracket
bushings as far as it will go.

SECTION TSM 845 ISSUE F PAGE 9 OF 14

INSTALLATION OF BUSHINGS

CARBON GRAPHITE:

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:

When removing old bracket bushings, mark location of
lubrication groove.

1. An arbor 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.

SILICON CARBIDE

When installing Silicon Carbide bushings into a metal part
the mating part must be heated to 600° F (preferable in an
oven). The bushing must be put into the proper position
quickly before the mating part cools down and the bushing
heats up. Failure to follow this procedure will result in cracked
bushings.

ASSEMBLY COUPLING:

SERIES MD-C80 COUPLING

DANGER !

2. Inspect canister O-ring for signs of wear and replace if

necessary. Slide canister over inner magnet and press
over O-ring until canister meets the pump mounting
flange.

3. Support the pump from overhead and secure coupling
bracket to avoid tipping when pump is attached. Using
the canister as a guide, slide the pump assembly up
to the coupling bracket through the smaller opening.
Secure with the four 0.5” capscrews. See Figure 17.

PUMP - BRACKET CAPSCREWS
(4 REQUIRED)

FIGURE 17

4. The outer magnet should be installed into the bearing

housing, if not refer to Disassembly & Assembly of
Bearing Housing. Install hand knobs so that 4” of threads
are projecting below housing. Support bearing housing
from overhead and gently position magnet over canister
so the magnet assemblies start to engage. Evenly
back out the hand knobs. See Figure 18. the bearing
housing move toward the bracket as the hand knobs are
removed.

Follow these directions exactly to avoid
injury to self or damage to pumping unit.
Be careful to keep inner & outer magnets
at least (1) foot apart until step 3. Do not
engage magnets in any other fashion.

1. Inspect magnets for any steel objects attached to the

magnets. Remove any foreign material. Place external
retaining ring and key on pump shaft. Slide inner magnet
assembly onto shaft so it butts against retaining ring.
Install washer, lock washer and capscrew to secure
magnet (See Figure 16). Insert a brass bar through a
port between two rotor teeth and tighten capscrew.

CANISTER

LOCK
WASHER
WASHER

0.44”
CAPSCREW
WITH HOLE

INNER
MAGNET

EXTERNAL
RETAINING

RING

SECONDARY O-RING

PRIMARY O-RING

FIGURE 18

5. Install the (4) 0.375” capscrews. Turn the output shaft
over by hand to make sure the pump rotates freely. See
Figure 19).

0.375” CAPSCREWS
(4 REQUIRED)

FIGURE 19

FIGURE 16

SECTION TSM 845 ISSUE F PAGE 10 OF 14

ADJUSTING HEAD GASKET
END CLEARANCE

Use either of the following procedures to properly adjust the
end clearance when replacing gaskets:

PROCEDURE A:

With balance plate in position, slide rotor and shaft into
casing. Insert a feeler gage of the proper thickness into the
port and between two rotor teeth (See Figure 20 on page

10). Install one 0.015” and one 0.007” gasket onto head.
With the idler on the idler pin, place the head into the pump
casing. With the capscrews tight, the feeler gage should fit
snugly, otherwise gaskets should be added or removed until
the proper clearance is attained.

PUMP ROTATION

The pump is designed to take fluid from the discharge side
of the pump and channel it down the idler pin into the shaft
and out into the canister through the capscrew which secures
the inner magnet. The fluid is returned through a hole in
the casing back to the suction side of the pump. There are
generally three parts which may need replacing or adjusting
to change rotation.

HEAD & PIN – Hole should be from the discharge side of
head to the pin and a pipe plug is placed in the tapped hole
on the suction side of the head. To change rotation, move the
plug to the opposite side of the head.

BALANCE PLATE – If the plate is separate from the bracket
and looks like the Style A in Figure 22, it can be reversed. The
groove should connect the discharge port to the bushing bore.
If rotation is changed, the plate is flipped over (not rotated)
and the groove would not be visible but will still function
properly. If the plate is like Style B, it is NOT reversible and a
new plate will be required.

BRACKET – The bracket will have two holes drilled through
and tapped on one side. The discharge side of the bracket
should feature a pipe plug with a hole drilled through it. To
change rotation simply move this pipe plug to the other hole.

Contact your local Viking distributor or the factory to determine
which parts are required.

FIGURE 20

PROCEDURE B:

If the pump is in line and the ports are not accessible,
remove the head and gaskets. Put the head back on (without
gaskets) and measure the gap as shown. (See Figure 21 on
page 10). After determining the gap between the head and
casing, select a combination of gaskets with approximately
25% more total thickness than the gap plus the required end
clearance. Note that the gaskets will compress when head is
tightened down. Remove the head, install all gaskets then
replace the head. Tighten the head capscrews and check
the pump clearance by making sure the pump turns freely
by hand.

Since the pump shaft is concealed, it is best to work up the
proper end clearance because it is difficult to determine when
there is to much end clearance with this approach.

GROOVE

STYLE BSTYLE A

FIGURE 22

FIGURE 21

SECTION TSM 845 ISSUE F PAGE 11 OF 14

PRESSURE RELIEF VALVE

DANGER !

Before opening any Viking pump liquid
chamber (pumping chamber, reservoir,
etc.) Be sure:

ASSEMBLY: RELIEF VALVE

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 Figure 3, page 2.

1. That any pressure in the chamber has
been completely vented through the
suction or discharge lines or other
appropriate openings or connections.
(See detailed procedure for venting
the pumps, pages 4, 5 and 6).

2. That the driving means (motor,
turbine, engine, etc.) has been
“locked out” or made otherwise non­operational so that it cannot be
inadvertently started while work is
being done on the 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.

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.

DISASSEMBLY: RELIEF VALVE

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 23.

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.

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.

VALVE - AS, AK AND AL SIZES

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 23

SECTION TSM 845 ISSUE F PAGE 12 OF 14

TROUBLESHOOTING PUMP INFORMATION

Some of the following may help pinpoint the problem:

Pump does not pump:

Pump Model Number:

► Lost its prime from air lead or low level in tank.
► Suction lift too high.
► Rotating in wrong direction.
► Strainer clogged.
► Bypass valve open, pressure relief valve set too low or

pressure relief valve poppet stuck open.

► Improper end clearance.
► Pump worn out.
► Any changes in liquid, system or operation that would

influence pump or coupling performance, e.g. new liquid,
additional lines or process changes.

► Temperature changes either in the liquid or the

environment.

► Magnetic coupling is decoupling. Change in application

(temperature, pressure, viscosity,’ etc.) may require
torque beyond coupling capabilities.

Pump starts, then loses its prime:

► Supply tank empty.
► Liquid vaporizing in the suction line.
► Air leak or air pocket in the suction line.

Pump is noisy:

► Pump is being starved (heavy liquid cannot get to pump

fast enough). Increase suction pipe size, reduce length
or slow down pump.

► Pump is cavitating (liquid vaporizing in suction line).

Increase suction pipe size or reduce length.

► Check alignment.
► Magnetic coupling decoupled. Shut off and restart.

Pump not delivering up to capacity:

Serial Number:

Date Received:

Date Installed:

Distributor:

Contact Person:

Phone:

Fax:

E-mail:

Comments:

► Starving or cavitating - increase suction pipe size or

reduce length.

► Strainer partially clogged.
► Air leak somewhere in suction line.
► Running too slow. Is motor the correct speed and

wired up correctly.

► Pressure relief valve set too low, tuck open or has

damaged poppet / seat.

► Bypass line around pump partially open.
► Pump worn out or too many gaskets.

Pump takes too much power (stalls motor):

► Liquid more viscous than unit sized to handle.
► System pressure relief valve set too high.
► Coupling misaligned.
► Bushings frozen up or liquid set up in coupling.

SECTION TSM 845 ISSUE F PAGE 13 OF 14

TECHNICAL SERVICE MANUAL

CAUTION !

TO REDUCE THE RISK OF LEAKAGE WITH VIKING
MAG DRIVE PUMPS, USERS SHOULD COMPLY
WITH THE FOLLOWING GUIDELINES AND ADHERE
TO THE FOLLOWING PROCEDURES:

■

 Thepumpcongurationandmaterialsusedinapump

are tailored to the application for which it is ordered.
Users should never use a pump for an application

thatisdifferentfrom the application speciedwhen

the pump was ordered. This includes differences in
liquid, speed, pressure, temperature or viscosity.

■

Users must understand the characteristics of liquids

they are pumping and be especially aware of any
particulates in the liquid. Particulates can cause
rapid wear of the bushings, especially if carbon
graphite bushings are used. Hard bushings and
hard shafts can reduce the risk of rapid wear, but
the use of hard materials is not always the optimal
solution. In applications involving non-abrasive, non­self lubricating liquids, carbon graphite bushings are
typically the preferred material.

■

Users should periodically inspect their pump for

wear. This is especially critical and should be
carried out with greater frequency when carbon
graphite bushings are used or the same pump has
not previously been used for the same application,
including the same liquid, speed, pressure,
temperature and viscosity. Users should promptly
replace worn parts when they are discovered.

■

Users should continuously monitor pumps that are

handling hazardous liquids. This is especially critical
for unmanned, remote locations. If a user does not
have in-house expertise in the area of monitoring,

it should contact a local engineering rm with

monitoring experience.

MAGNETIC DRIVE PUMPS

SERIES 823 – STEEL

SECTION TSM 845

PAGE 14 OF 14

825 – CAST IRON

827 – STAINLESS STEEL

ISSUE F

SIZES K & KK

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.

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

© 3/2013 Viking Pump Inc.
All rights reserved