Viking pump GP-425 SERIES Operating manual

TECHNICAL SERVICE MANUAL
VIKING PUMP, INC. •A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA
MODEL NUMBER CHART
MODEL NUMBER SYSTEM
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 the complete name of the part, part number and material
with the model number and serial number of the pump when
ordering repair parts. The unmounted pump or pump unit
model number and serial number are on the nameplate.
This manual deals only with Series GP-425
External Gear Pumps. Refer to Figures 1 through 5
for general configuration and nomenclature used in this
manual. Contact factory for pump specifications and
recommendations.
G P - 4 2 5 2 5 - N 0 O
External Gear
Principle
Pump Size:
25
50
75
Pump Relief Valve:
O = No Relief Valve
Gear O.D.:
“25”
Design Series:
N = Cartridge Mech Seal
Shaft Rotation:
0 = Clockwise
1 = Counter-Clockwise
Shaft Seal:
4 = Mechanical
Seal
UNMOUNTED PUMP UNITS
MECH. SEAL Units are designated by
the unmounted pump
model numbers followed
by a letter(s) indicating
drive style.
D = Direct Drive
GP-42525-N0O
GP-42525-N1O
GP-42550-N0O
GP-42550-N1O
GP-42575-N0O
GP-42575-N1O
Electronic copies of the most current TSM issue can be found on the Viking Pump website at www.vikingpump.com
CONTENTS
Introduction .............................................................................1
Model Number System ...........................................................1
Model Number Chart...............................................................1
Safety Information & Instructions............................................2
Installation ...............................................................................3
Maintenance............................................................................5
Repair Parts ............................................................................5
Cartridge Mechanical Seal in GP-414 Pumps........................6
Seal Removal ......................................................................6
Seal Installation ...................................................................6
Troubleshooting ......................................................................7
Do’s & Don’ts ..........................................................................8
SECTION TSM 340.3
PAGE 1 OF 8
ISSUE A
SERIES GP-425
EXTERNAL GEAR PUMPS

SECTION TSM 340.3 ISSUE A PAGE 2 OF 8
BEFORE opening any liquid chamber (pumping
chamber, reservoir, relief valve adjusting cap fitting,
etc.) be sure that:
● Any pressure in the chamber has been completely
vented through the suction or discharge lines or
other appropriate openings or connections.
● The pump drive system means (motor, turbine,
engine, etc.) has been “locked out” or otherwise
been made non-operational so that it cannot be
started while work is being done on the pump.
● You know what material the pump has been
handling, have obtained a material safety data
sheet (MSDS) for the material, and understand
and follow all precautions appropriate for the safe
handling of the material.
BEFORE operating the pump, be sure all drive guards
are in place.
DO NOT operate pump if the suction or discharge
piping is not connected.
DO NOT place fingers into the pumping chamber or
its connection ports or into any part of the drive train
if there is any possibility of the pump shafts being
rotated.
DO NOT exceed the pumps rated pressure, speed, and
temperature, or change the system/duty parameters
from those the pump was originally supplied, without
confirming its suitability for the new service.
BEFORE operating the pump, be sure that:
● It is clean and free from debris
● all valves in the suction and discharge pipelines
are fully opened.
● All piping connected to the pump is fully supported
and correctly aligned with the pump.
● Pump rotation is correct for the desired direction
of flow.
INSTALL pressure gauges/sensors next to the
pump suction and discharge connections to monitor
pressures.
USE extreme caution when lifting the pump. Suitable
lifting devices should be used when appropriate. If
the pump is mounted on a base plate, the base plate
must be used for all lifting purposes. If slings are used
for lifting, they must be safely and securely attached.
For weight of the pump alone (which does not include
the drive and/or base plate) refer to the Viking Pump
product catalog.
AVOID contact with hot areas of the pump and/or
drive. Certain operating conditions, temperature
control devices (jackets, heat-tracing, etc.), improper
installation, improper operation, and improper
maintenance can all cause high temperatures on the
pump and/or drive.
THE PUMP must be provided with pressure protection.
This may be provided through an in-line pressure relief
valve, a torque limiting device, or a rupture disk. If
pump rotation may be reversed during operation,
pressure protection must be provided on both sides
of pump. For additional information, refer to Viking
Pump’s Technical Service Manual TSM 000 and
Engineering Service Bulletin ESB-31.
THE PUMP must be installed in a manner that allows
safe access for routine maintenance and for inspection
during operation to check for leakage and monitor
pump operation.
WARNING
SAFETY INFORMATION & INSTRUCTIONS
Danger - Failure to follow the indicated
instruction may result in serious injury
or death.
Warning - In addition to possible serious
injury or death, failure to follow the
indicated instruction may cause damage
to pump and/or other equipment.
IMPROPER INSTALLATION, OPERATION OR MAINTENANCE OF PUMP MAY CAUSE SERIOUS INJURY
OR DEATH AND/OR RESULT IN DAMAGE TO PUMP AND/OR OTHER EQUIPMENT. VIKING’S WARRANTY
DOES NOT COVER FAILURE DUE TO IMPROPER INSTALLATION, OPERATION OR MAINTENANCE.
THIS INFORMATION MUST BE FULLY READ BEFORE BEGINNING INSTALLATION, OPERATION OR
MAINTENANCE OF PUMP AND MUST BE KEPT WITH PUMP. PUMP MUST BE INSTALLED, OPERATED
AND MAINTAINED ONLY BY SUITABLY TRAINED AND QUALIFIED PERSONS.
THE FOLLOWING SAFETY INSTRUCTIONS MUST BE FOLLOWED AND ADHERED TO AT ALL TIMES.
WARNING
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Legend :
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WARNING
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SECTION TSM 340.3 ISSUE A PAGE 3 OF 8
COMPONENT & UNIT LIFTING FEATURES
Viking will leave all removable lifting features, such as threaded eye bolts and hoist rings, installed in components (pumps,
reducers, motors, etc.) and baseplates. These features are used to safely lift and move the individual components. TSM-
000 which is shipped with all pumps has been revised to include general details and figures of proper and improper lifting
techniques, and the figures are included below. If more detail specific to a pump model or unit is necessary, it will be included
in the specific Technical Service Manual.
NOTE: Units should be lifted by the
base lifting features using two or
more lifting slings.
NOTE: NEVER lift the unit with slings
unsecured under the base. The slings
can slide, allowing the unit to tip and/or
fall. Improper lifts can result in personal
injury and/or damage to the unit.
NOTE: NEVER lift the unit with slings
connected to the component lifting
features. The lifting features are
designed for the individual component
and are not rated to lift the entire unit.
Improper lifts can result in personal
injury and/or damage to the unit
FIGURE 1
EXAMPLE OF PROPER
LIFTING METHOD
FIGURE 2
EXAMPLE OF IMPROPER
LIFTING METHOD
FIGURE 3
EXAMPLE OF IMPROPER
LIFTING METHOD
SPECIAL INFORMATION INSTALLATION
GENERAL:
The following items must be considered prior to pump
installation:
1. Location - locate the pump as close as possible to
supply of liquid being pumped. If possible locate pump
below liquid supply. Viking pumps are self-priming; but,
the better the suction conditions the better the pump will
perform.
2. Accessibility - pump must be accessible for inspection,
maintenance and repair.
3. Suction/Discharge - GP Series pumps are rotation
specific (viewed from end of shaft).
ROTATION:
Viking external gear pumps can be offered in a clockwise
(-N0) or counter clockwise (-N1) rotation. The intended
rotation and inlet / outlet port positions are noted on the pump
nameplate. Do not run the pump in reverse, or the seal will be
exposed to full discharge pressure.
PIPING:
The GP Series pumps are high pressure pumps and can
have high inlet pressures, as well. Make sure all piping and
fittings on both the inlet and discharge side of the pump are
rated for the expected pressures!
DANGER !
Before opening any Viking pump liquid chamber
(pumping chamber, reservoir, relief valve adjusting
cap fitting, etc.) be sure:
1. That any pressure in the chamber has been
completely vented through the suction or
discharge lines or other appropriate openings
or connections.
2. That the driving means (motor, turbine, engine,
etc.) has been “locked out” or made non-
operational so that it cannot be started while
work is being done on pump.
3. That you know what liquid the pump has been
handling and the precautions necessary to
safely handle the liquid. Obtain a material
safety data sheet (MSDS) for the liquid to be
sure these precautions are understood.
Failure to follow above listed precautionary
measures may result in serious injury or death.

SECTION TSM 340.3 ISSUE A PAGE 4 OF 8
5. A pressure relief valve is required in the discharge line.
See “Installation, General”.
6. The pump must not be used to support the piping.
Hangers, supports, stands, etc. must carry the weight of
the pipes.
7. When fastening piping to the pump do not impose any
strain on the pump casing.
“Springing” or “drawing” the piping up to the pump will
cause distortion, possible misalignment and probable
rapid wear of the pump. Do not use the pump to correct
errors in piping layout or assembly.
8. All joints of piping system must be tight. Loose joints
result in liquid leaks or suction side leaks. Air leaks make
the pump noisy and reduce flow.
9. Drive alignment must be checked after piping has been
connected to the pump.
10.Provide a pressure relief device in any part of a pump
and piping system that can be valved off and, thus,
completely isolated. A rise in temperature will cause a
liquid to expand. If there is no provision for pressure
relief in the closed off section, there is a chance that the
pump or piping will rupture.
DANGER!
Before starting the pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may result in
serious injury or death.
START UP:
Before pushing “start” button, check the following:
1. Vacuum and pressure gauges (liquid filled) are mounted
on or near the pump. Gauges are the quickest and most
accurate way of finding out what is happening in the pump.
2. Pump is correctly aligned using good laser alignment
equipment.
3. There is no pipe strain on the pump casing.
4. Rotate the pump shaft by hand to be sure it turns freely.
5. Motor has been jogged and is running in the correct
direction. Refer to “Installation, General” on page 3.
6. Pressure relief valve is installed properly in the system.
7. Suction piping is connected and tight, and valves are open.
8. Make sure the discharge piping is properly connected
and sealed, valves are open, and there is a place for the
liquid to go.
9. Make sure all guards are in place.
10.The above checklist is a general guideline to be used
prior to starting the pump. Since Viking Pump cannot
foresee every application for our product and possible
system design, the final responsibility is with the
user. The pump must be utilized within the catalog
specifications and the pump system must be designed to
provide safe working conditions.
PRESSURE RELIEF VALVES:
Viking pumps are positive placement pumps and must be
provided with some sort of pressure protection. This may be
an inline pressure relief valve, a torque limiting device or a
rupture disk.
For additional information on pressure relief valves, refer to
Technical Service Manual TSM000 and Engineering Service
Bulletin ESB-31.
MOUNTING:
1. Surfaces pump mounts against must be clean and flat.
2. For NEMA Mount, use SAE Grade 5 or better capscrews
to mount pump.
3. Standard GP Series pumps are designed to be used with
spacer type couplings that do not induce axial thrust on
the pump shaft. If an improper type of coupling is used,
internal damage may result.
4. Do not strike or press the pump drive coupling to install.
Internal pump damage will result. If the coupling does
not slide onto the shaft, inspect the coupling, shaft and
key for nicks or burrs and remove.
5. Once the pump has been mounted and the coupling
installed, it is recommended to put lube oil into the suction
port and turn the pump by hand to make sure it turns freely.
ALIGNMENT:
Check alignment after mounting.
1. If unit has flexible coupling, remove any coupling guards
or covers and check alignment of coupling halves using
good laser alignment equipment.
Viking recommends an offset misalignment of .0025”
or better and an angular misalignment of .003”/10”
or better. Consult coupling manufacturer’s alignment
requirements for acceptability.
2. Make final check on alignment after all piping
connections have been made.
PIPING/HOSE:
The cause of many pumping problems can be traced to
suction piping. It should always be as large in diameter and
as short in length as possible.
Before starting layout and installation of your piping system,
consider the following points:
1. Never use piping smaller than pump port connections.
Piping larger in diameter than the port connection is
sometimes required to reduce suction losses.
2. Be sure the inside of pipe is clean before installing.
3. When approaching an obstacle to the suction line, go
around instead of over it. Going over an obstacle can
create an air pocket. Where practical, slope the piping so
no air or liquid pockets will be formed. Air pockets in the
suction line make it hard for the pump to prime.
4. A strainer on the suction side of the pump should always
be considered in any pumping system. The strainer will
keep foreign matter from entering the pump. The strainer
mesh or perforation size should be large enough so
that it does not cause excessive pressure drop, but fine
enough to protect the pump.
Use of a strainer is particularly important at start up to
help clean the system of weld beads, pipe scale and
other foreign objects.

SECTION TSM 340.3 ISSUE A PAGE 5 OF 8
DANGER!
Before starting the pump, be sure all drive
equipment guards are in place.
Failure to properly mount guards may result in
serious injury or death.
The “start” button may now be pushed.
The pump should begin to deliver liquid within 15 seconds! If
not, push the stop button. Do not run the pump without liquid
flow longer than 30 seconds or the pump may be ruined.
Review Startup steps 1 through 10. Consider what the suction
and discharge gauges may indicate. If everything appears in
order, re-prime pump. Refer to “Mounting”, page 4.
Push the “start” button. If nothing is flowing within 30 seconds,
stop the pump. The pump is not a compressor, it will not build
up much air pressure. It may be necessary to vent discharge
line until liquid begins to flow.
If pump still does not deliver, consider one or more of
the following:
1. The suction line has air leaks.
2. The end of the suction pipe is not submerged deeply
enough in the liquid.
3. The suction lift is too great or the suction piping is too small.
4. Liquid is vaporizing in the suction line before it gets to
the pump.
If after consideration of these points, the pump still does not
deliver liquid, review all points given under START UP and
read through the TROUBLESHOOTING guide and try again.
If pump still will not deliver liquid, contact your Viking Pump
supplier.
MAINTENANCE
Series GP-425 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.
CLEANING PUMP:
Keep pump as clean as possible. This will facilitate inspection,
adjustment and repair work.
STORAGE:
If pump is to be stored, or not used for six months or more,
pump must be drained and a coat of light oil must be applied
to all internal pump parts. Viking suggests rotating pump shaft
by hand one complete revolution every 30 days to circulate
the oil. Tighten all pump assembly bolts before putting pump
in service after being stored.
SUGGESTED SEAL REPLACEMENT TOOLS:
The following tools must be available to properly replace the
seals in Series GP-425 external gear 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 or automobile tool
supplier.
1. Soft headed hammer
2. Allen wrenches: 3/16” & 1/8”
3. Hex driver socket for use with torque wrench: 15/16”
4. Mechanical seal installation sleeve
5. Spanner wrench
6. Locknut tool
7. Brass / plastic bar
REPAIR PARTS
The only parts recommended for replacement in the pump
are the mechanical seal and o-rings, and must be replaced if
the pump is disassembled.
Contact Viking Pump or your Authorized Viking Pump
Distributor for price and availability on Genuine Viking Pump
seal kits.
The Viking Pump GP series is precision machined with fixed
end clearances and assembly tolerances. Viking recommends
any repairs beyond seal replacement be facilitated through
the Viking Pump Warranty Department.
DO NOT PLACE
FINGERS HERE
DANGER !
Before opening any Viking pump liquid chamber
(pumping chamber, reservoir, relief valve adjusting
cap fitting, etc.) be sure:
1. That any pressure in the chamber has been
completely vented through the suction or
discharge lines or other appropriate openings
or connections.
2. That the driving means (motor, turbine, engine,
etc.) has been “locked out” or made non-
operational so that it cannot be started while
work is being done on pump.
3. That you know what liquid the pump has been
handling and the precautions necessary to
safely handle the liquid. Obtain a material
safety data sheet (MSDS) for the liquid to be
sure these precautions are understood.
Failure to follow above listed precautionary
measures may result in serious injury or death.

SECTION TSM 340.3 ISSUE A PAGE 6 OF 8
ITEM NAME OF PART ITEM NAME OF PART ITEM NAME OF PART
1Bracket 11 O-Rings 19 Gear Set
2Bearing Housing Assembly 12 Driver Shaft 20 Studs
3Locknut 13 Driven Shaft 22 Seal Nuts
4Lock Washer 15 Gear Pin (Driven Gear) 23 Lock Washers
5Set Screws 15A Gear Pin (Driver Gear) 23A Flat Washers
8Mechanical Seal 17 Alignment Pins 29 Head & Bushing Assembly
10 Seal Studs 18 Casing
FIGURE 4 – EXPLODED VIEW – MODELS GP-425 CARTRIDGE MECHANICAL SEAL PUMPS
FIGURE 5
TABLE 1 – MECHANICAL SEAL STUD TORQUE SPEC
CARTRIDGE MECHANICAL SEAL
IN GP-425 PUMPS
Seal Removal
1. Remove port adaptor on one side of the pump to access
the flow port/gears.
2. Insert brass or plastic bar into one of the pump ports
and into the space between gear teeth to prevent the
driver from spinning. If removing the seal while pump is
installed, lock shaft to prevent spinning. Bend up tang
of lockwasher (Item 4) with flat bladed screw driver or
small flat punch and a hammer. With a spanner wrench,
remove locknut (Item 3) from shaft (Item 12). Remove
lockwasher from shaft.
3. Loosen two set screws in the face of the bearing housing
(Item 2), and turn the bearing housing CCW to remove
the bearing housing assembly from the bracket (Item 1).
4. Remove window guard (not shown) from bracket.
5. If flush plan or barrier fluid tubes are connected to the
seal gland (Item 8), turn off and disconnect before
removing seal. Also, remove all pipe plugs from seal
gland for ease of removal through bearing housing
opening. Place set clips on seal. Loosen the set screws
on the cartridge seal collar to free the cartridge seal
from the shaft. Remove nuts and washers from studs.
Remove all fittings and pipe plugs from seal gland. Slide
cartridge seal out through bearing housing opening.
Seal Installation
Series Torque (ft.-lbs.) Torque (N-m)
GP-425 45 - 50 61 - 68
2
20A
22
1
29 11
15A
19 18
11 29 20
29
17
13
15
12
23 10
8
23A
3
49
5
1. NOTE: Burrs left on shaft can damage O-rings on seal
sleeve during installation. Inspect shaft for burrs and
remove any found with a fine grade of emery cloth.
2. Clean driver shaft and face of seal chamber on bracket.
3. Place tapered installation sleeve on shaft. Coat driver
shaft, tapered installation sleeve, and O-rings in the
inside diameter of cartridge seal sleeve with a generous
amount of light oil. See Figure 5.
4. Slide cartridge seal over installation sleeve on shaft until
it contacts the seal chamber face. Be sure the flush port
opening on the seal gland is at the 12 o’ clock position.
Remove tapered installation sleeve from shaft.
5. Secure seal gland to bracket face using nuts (Item 22),
flat washers (Item 23), and lock washers (Item 23A)
onto studs (Item 10). NOTE: Tighten nuts on studs to
specifications in Table 1.
6. Tighten setscrews on cartridge seal drive collar to shaft
and remove or turn seal centering clips so as to clear the
seal drive collar.
7. Turn shaft by hand to check seal drive collar for runout.
8. Connect flush plan or barrier fluid lines or vent stuffing box,
if no flush plan, until liquid is present in stuffing box. Install
pipe plugs in any remaining port openings in the seal gland.
9. Replace window guard on bracket.
10.Insert brass or plastic bar into one of the pump ports and
into the space between gear teeth to prevent the driver
from spinning.
11. Turn the bearing housing CW to install the bearing
housing assembly to the bracket (Item 1) until flush and
tighten the two set screws in the face of the bearing
housing (item 2).
TAPERED INSTALLATION SLEEVE
SHAFT

SECTION TSM 340.3 ISSUE A PAGE 7 OF 8
TABLE 2 – LOCKNUT TORQUE SPEC
TABLE 3 – FLANGE CAPSCREW TORQUE SPEC
TROUBLESHOOTING
A Viking pump that is properly installed and maintained will
give long satisfactory performance.
If trouble does develop, one of the first steps toward finding
the difficulty is to install a vacuum gauge in the suction line
and a pressure gauge in the discharge line. Readings on
these gauges often give a clue on where to start looking for
trouble.
VACUUM GAUGE - SUCTION PORT:
High vacuum reading would indicate:
1. The suction line is blocked, valve closed, a strainer is
plugged or a pinched suction line.
2. The suction line is too small.
3. The liquid is too viscous to flow through the piping.
4. The lift required is too high.
Low reading would indicate:
1. There may be an air leak in the suction line.
2. The end of the pipe is not in the liquid.
3. The pump is worn.
4. The pump is dry and should be primed.
Fluttery, jumping or erratic reading would indicate:
1. The liquid is vaporizing.
2. Liquid is coming in to the pump in slugs, possibly an air
leak or insufficient liquid above the end of the suction
pipe.
3. Vibration from cavitation, misalignment, or damaged
parts.
PRESSURE GAUGE - DISCHARGE PORT:
High reading would indicate:
1. High viscosity and small diameter and/or lengthy
discharge line.
2. A downstream strainer or filter is plugged.
3. The pressure relief valve is set too high.
4. Valve in the discharge line partially closed.
5. Line partially plugged from build up on inside of pump,
solidified product or foreign object.
6. Liquid in the pipe not up to temperature.
Low reading would indicate:
1. Pressure relief valve set too low.
2. Pressure relief valve poppet not seating properly.
3. Pump assembly bolts not torqued to specifications.
4. The bypass around pump partially open.
5. Pump is damaged or worn.
6. The pump has too much internal clearance.
Fluttery, jumping or erratic reading would indicate:
1. Cavitation.
2. Liquid is coming to the pump in slugs.
3. Air leak in the suction line.
4. Vibrating from misalignment or mechanical problems.
MISCELLANEOUS:
Pump does not pump:
1. The pump has lost its prime from air leak or low level in
tank.
2. The suction lift is too high.
3. Rotating in the wrong direction.
4. The motor does not come up to speed.
5. The strainer is clogged.
6. The bypass valve is open, pressure relief valve set too
low or pressure relief valve poppet stuck open.
7. The pump is worn out.
8. Any changes in liquid, system or operation that would
help explain the trouble, e.g. new liquid, additional lines
or process changes.
Pump starts, then loses its prime:
1. The supply tank is empty.
2. The liquid is vaporizing in the suction line.
3. There is an air leak or air pockets in the suction line.
4. The pump is worn out.
Pump is noisy:
1. The pump is cavitating (liquid vaporizing in suction line)
or being starved (heavy liquid cannot get to pump fast
enough). Increase the suction pipe size and/or reduce
the length, or decrease the pump speed. If the pump is
above the liquid, raise the liquid level closer to the center
line of the inlet port. If the liquid is above the pump,
increase the head of the liquid.
2. Check alignment.
3. Anchor the base or piping to eliminate vibration.
Pump not delivering up to capacity:
1. The pump is starving or cavitating – see Pump is noisy,
item 1.
2. The strainer partially clogged.
3. Air leak somewhere in the suction line.
4. Running too slow. Is the motor the correct speed and
wired up correctly?
5. Pressure relief valve is set too low, stuck open or has
damaged poppet seat.
Series Torque (ft.-lbs.) Torque (N-m)
GP-425 170 - 190 235 - 255
Port Size Torque (ft.-lbs.) Torque (N-m)
6” Ports 500 - 550 678 - 746
12.Place lockwasher (item 4) on shaft end. Place locknut
(item 3) on shaft and tighten to specs in Table 2 using
a spanner wrench. After locknut has been torqued to
specification, bend up tang of lockwasher with a flat
bladed screw driver or small flat punch and a hammer.
13.Once assembled, remove the inserted brass or plastic
bar and turn pump by hand to confirm free movement of
the driver shaft.
14.Reinstall port adaptor per torque specs and reattach to
piping.

TECHNICAL SERVICE MANUAL
VIKING PUMP, INC. •A Unit of IDEX Corporation • Cedar Falls, IA 50613 USA © 4/2018 Viking Pump Inc.
All rights reserved
WARRANTY
Viking pumps, strainers and reducers are warranted to be
free of defects in material and workmanship under normal
conditions of use and service. The warranty period varies by
type of product. A Viking product that fails during its warranty
period under normal conditions of use and service due to a
defect in material or workmanship will be repaired or replaced
by Viking. At Viking’s sole option, Viking may refund (in cash
or by credit) the purchase price paid to it for a Viking product
(less a reasonable allowance for the period of use) in lieu of
repair or replacement of such Viking product. Viking’s warranty
is subject to certain restrictions, limitations, exclusions and
exceptions. A complete copy of Viking’s warranty, including
warranty periods and applicable restrictions, limitations,
exclusions and exceptions, is posted on Viking’s website
(www.vikingpump.com/warranty/warranty-info). A complete
copy of the warranty may also be obtained by contacting
Viking through regular mail at Viking Pump, Inc., 406 State
Street, Cedar Falls, Iowa 50613, USA.
THIS WARRANTY IS AND SHALL BE VIKING’S SOLE
AND EXCLUSIVE WARRANTY AND IS IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, ALL WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NON-INFRINGMENT, ALL OF WHICH
OTHER WARRANTIES ARE EXPRESSLY EXCLUDED.
THE RIGHTS AND REMEDIES UNDER THIS WARRANTY
ARE AND SHALL BE THE SOLE AND EXCLUSIVE RIGHTS
AND REMEDIES AGAINST VIKING. EXCEPT FOR THE
SPECIFIC LIABILITIES AND OBLIGATIONS PROVIDED
UNDER THIS WARRANTY, VIKING SHALL HAVE NO
LIABILITY OR OBLIGATION WITH RESPECT TO ANY
PRODUCT CLAIMED TO BE DEFECTIVE IN ANY MANNER.
UNDER NO CIRCUMSTANCES SHALL VIKING BE
LIABLE UNDER THIS WARRANTY OR OTHERWISE FOR
SPECIAL, INCIDENTAL, INDIRECT, CONSEQUENTIAL OR
PUNITIVE DAMAGES OF ANY KIND, INCLUDING, BUT NOT
LIMITED TO, LOST OR UNREALIZED SALES, REVENUES,
PROFITS, INCOME, COST SAVINGS OR BUSINESS, LOST
OR UNREALIZED CONTRACTS, LOSS OF GOODWILL,
DAMAGE TO REPUTATION, LOSS OF PROPERTY, LOSS
OF INFORMATION OR DATA, LOSS OF PRODUCTION,
DOWNTIME, OR INCREASED COSTS, IN CONNECTION
WITH ANY PRODUCT, EVEN IF VIKING HAS BEEN ADVISED
OR PLACED ON NOTICE OF THE POSSIBILITY OF SUCH
DAMAGES AND NOTWITHSTANDING THE FAILURE OF
ANY ESSENTIAL PURPOSE OF ANY PRODUCT.
6. The bypass line around the pump partially opened.
7. The pump is worn out.
Pump takes too much power (stalls motor):
1. Liquid is more viscous than the is unit sized to handle.
2. The system pressure relief valve set too high.
3. The pump is misaligned.
DO’S & DON’TS
Do’s and Don’ts for installation, operation and maintenance
of Viking pumps to assure safe, long, trouble free operation.
INSTALLATION:
1. DO install the pump as close to supply tank as possible.
2. DO leave working space around the pumping unit.
3. DO use large, short and straight suction port.
4. DO install a strainer in the suction line.
5. DO a double check of alignment after unit is mounted
and piping has been connected to the pump.
6. DO provide pressure relief valve for discharge side of
pump.
7. DO check for proper rotation.
8. DO use piping, hose and fittings rated for maximum
system pressure.
OPERATION:
1. DON’T run the pump at speeds faster than those shown
in the catalog at that size.
2. DON’T allow the pump to develop pressure higher than
those shown in catalog at that size.
3. DON’T operate pumps at temperatures above or below
limits shown in catalog for model.
4. DON’T operate unit without all guards in place.
5. DON’T operate pump without pressure relief valve in
discharge piping; be sure valve is mounted and set
correctly.
6. DON’T stick fingers in ports of pump!!! Fingers may be
pinched between gears.
7. DON’T work on the pump unless driver has been “locked
out” so it cannot be started while work is being done on
the pump.
MAINTENANCE:
1. DO record pump model number and serial number and
file for further use.
2. DO have spare parts, pump or stand by units available,
particularly if pump is essential part of key operation
process.
3. DO obtain, read and keep all maintenance instructions
furnished with this pump.
SECTION TSM 340.3
PAGE 8 OF 8
ISSUE A
SERIES GP-425
EXTERNAL GEAR PUMPS