GORMAN-RUPP 10 SERIES Operating instructions

PUBLICATION NUMBER MR--04885
December 1, 1998
Rev. B 12/10/01
Use With: OM--04760
THE GORMAN-RUPP COMPANY DMANSFIELD, OHIO
GORMAN-RUPP OF CANADA LIMITED DST. THOMAS, ONTARIO, CANADA Printed in U.S.A.
ECopyright by the Gorman-Rupp Company
10 SERIES PUMPS
12B, 12C, 12D, 13A, 13C And 13E
Electric Motor Or Engine Driven Pumps
with Self Lubricated or Grease Seal

The engine exhaust from this
product contains chemicals
known tothe State of Californiato
cause cancer, birth defects or
other reproductive harm.

MR--0488510 SERIES PUMPS
PAGE I -- 1
INTRODUCTION
INTRODUCTION
Thank You for purchasing a Gorman-Rupp 10
Series Pump. Read this manual carefully to learn
howtosafelymaintainandserviceyourpump.Fail-
ure to do so could result in personal injury or dam-
age to the pump.
A set of three manuals accompanies your pump.
TheInstallation/OperationManualcontainsessen-
tial information on installing and operating the
pump. The Parts List Manual provides a perform-
ance curve, a pump model cross-section drawing,
andpartslistforyourpump.
This Maintenance and Repair Manual provides
troubleshooting and maintenance instructions re-
quiredto properlydiagnose operationalproblems,
and to service the pump components.
As described on the following page, this manual
willalert personnel toknown procedures which re-
quire specialattention, to those which could dam-
age equipment, and to those which could be dan-
gerous topersonnel. However, this manualcannot
possibly anticipate and provide detailed precau-
tions for every situation that might occur during
maintenance of the pump. Therefore, it is the re-
sponsibility of the owner/maintenance personnel
to ensure that only safe, established maintenance
proceduresare used, and that any procedures not
addressed in this manualare performed only after
establishing that neither personalsafety nor pump
integrity are compromised by such practices.
Pumps and related equipment must be installed
andoperatedaccordingtoallnational,localandin-
dustry standards.
If there are any questions regarding the pump
which are not covered in this manual or in other lit-
erature accompanying the unit, please contact
your Gorman-Rupp distributor or the Gorman-
Rupp Company:
The Gorman-Rupp Company
P.O. Box 1217
Mansfield, Ohio 44901--1217
or:
Gorman-Rupp of Canada Limited
70 Burwell Road
St. Thomas, Ontario N5P 3R7
CONTENTS
SAFETY -- SECTION A
TROUBLESHOOTING -- SECTION B
PREVENTIVE MAINTENANCE PAGE B --- 3..................................................
PUMP MAINTENANCE AND REPAIR -- SECTION C
GENERAL INFORMATION PAGE C --- 1.....................................................
Lifting PAGE C --- 1....................................................................
PARTS IDENTIFICATION LIST:
Pump Assembly w/Self Lubricated Seal PAGE C --- 3......................................
Pump Assembly w/Grease Seal PAGE C --- 5.............................................
PUMP AND SEAL DISASSEMBLY AND REASSEMBLY PAGE C --- 6............................
Impeller Clearances PAGE C --- 11......................................................
LUBRICATION PAGE C --- 12...............................................................
Self Lubricated Seal Assembly PAGE C --- 12.............................................
Grease Seal Assembly PAGE C --- 12....................................................
Power Source PAGE C --- 13...........................................................

MR--04885 10 SERIES PUMPS
PAGE I -- 2 INTRODUCTION
RECORDING MODEL AND
SERIAL NUMBERS
Pleaserecordthepumpmodel,serialnumber,volt-
age,andphaseinthespacesprovidedbelow.Your
Gorman-Rupp distributor needs this information
when you require parts or service.
Pump Model:
Serial Number:
Voltage:
Phase:
WARRANTY INFORMATION
The warranty provided with your pump is part of
Gorman-Rupp’s support program for customers
who operate and maintain their equipment as de-
scribed in this and the other accompanying litera-
ture. Please note that should the equipment be
abused or modified to change its performance be-
yond the original factory specifications, the war-
ranty will become void and any claim will be de-
nied.
The following are used to alert personnel to procedures which require special attention, to those which
could damage equipment, and to those which could be dangerous to personnel:
Immediate hazards which WILL result in
severe personal injury or death. These
instructions describe the procedure re-
quired and the injury which will result
from failure to follow the procedure.
Hazards or unsafe practices which
COULD result in severe personal injury
or death. These instructions describe
the procedure required and the injury
which could result from failure to follow
the procedure.
HazardsorunsafepracticeswhichCOULD
resultinminorpersonalinjuryorproductor
property damage. These instructions de-
scribe the requirements and the possible
damage which could result from failure to
follow the procedure.
NOTE
Instructions to aid in installation, operation, and
maintenance or which clarify a procedure.

10 SERIES PUMPS MR--04885
PAGE A -- 1SAFETY
SAFETY - SECTION A
This information applies to 10 Series
electric motor or engine driven pumps.
Refer to the manual accompanying the
power source before attempting to be-
gin operation.
This manual will alert personnel to
known procedures which require spe-
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel.How-
ever,thismanualcannotpossiblyantici-
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit.Therefore,it is the responsibility of
the owner/maintenance personnel to
ensurethatonlysafe, established main-
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab-
lishing that neither personal safety nor
pump integrity are compromised by
such practices.
Thismanual containsessentialinforma-
tion on troubleshooting and maintain-
ing the pump.In additionto this manual,
see the separate literature covering
installation and operation, pump parts,
and any optional equipment shipped
with the pump.
Beforeattemptingtoopenorservicethe
pump:
1. Familiarize yourself with this man-
ual.
2. Disconnect or shut down the pow-
er source and take the necessary
precautions to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau-
tiously.
7. Drain the pump.
Do not attempt to pump any liquids the
pump has not been designed for, and
which may damage the pump or endan-
ger personnel as a result of pump fail-
ure. Consult the factory to determine
compatibilitybetweenthepumpandliq-
uid.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
After the pump has been positioned,
make certain that the pump and all pip-
ing or hose connections are tight,prop-
erly supported and secure before oper-
ation.
Do not operate the pump against a
closeddischarge valveforlongperiods
oftime.Ifoperatedagainstacloseddis-
charge valve, pump components will

10 SERIES PUMPSMR--04885
PAGE A -- 2 SAFETY
deteriorate, and the liquid could come
to a boil, build pressure, and cause the
pump casing to rupture or explode.
Do not remove plates, covers, gauges,
pipe plugs, or fittings from an over-
heatedpump. Vaporpressure within the
pump can cause parts being disen-
gaged to be ejected with great force.Al-
low the pump to cool before servicing.
Thesepumpsmaybeusedtohandle
productswhichifoverheatedcouldpro-
duce dangerous fumes. Use extreme
caution when venting the pump, or
whenremovingcovers,plates,plugs,or
fittings.
Neverrunthispumpbackwards.Becer-
tain that rotation is correct before fully
engaging the pump.
If the pump is used to pump materials
which could cause serious illness or in-
jury through direct exposure or emitted
fumes, wear protective clothing, such
asrubbergloves,facemask,andrubber
apron, as necessary before disassem-
bling the pump or piping.
Do not operate the pump without
shields and/or guards in place over the
drive shafts, belts, and/or couplings, or
other rotating parts. Exposed rotating
parts can catch clothing, fingers, or
tools, causing severe injury to person-
nel.
If the pump is powered by an electric
motor, do not operate a non-explosion
proof motor in an explosive atmo-
sphere. An explosion, which may cause
severe personal injury or death, could
result. Install, connect and operate the
motor in accordance with the National
Electric Code and all local codes. If
there is a conflict between the instruc-
tions in the manual accompanying the
unit and the National Electric Code or
applicable local code, the National or
Local code shall take precedence. All
electrical equipment supplied with the
pump conforms to applicable federal
regulations and national codes in effect
on the date of manufacture.
If the pump is electric motor driven, the
electrical power used to operate this
pump is high enough to cause injury or
death. Obtain the servicesof aqualified
electrician to troubleshoot, test and/or
service the electrical components of
this pump.
If the pump is powered by an internal
combustion engine, do not operate in
anexplosiveatmosphere.Whenoperat-
ing internal combustion engines in an
enclosed area, make certain that ex-
haust fumes are piped to the outside.
These fumescontain carbon monoxide,
a deadly gas that is colorless, tasteless,
and odorless.

10 SERIES PUMPS MR--04885
PAGE A -- 3SAFETY
Fuel used by internal combustion en-
gines presents an extreme explosion
and fire hazard. Make certain that all
fuel lines are securely connected and
free of leaks. Never refuel a hot or run-
ning engine. Avoid overfilling the fuel
tank.Alwaysusethe correcttypeoffuel.
Never tamper with the engine governor
to gain more power. The governor esta-
blishessafeoperatinglimitsthatshould
not be exceeded. The maximum contin-
uous operating speed for the pump is
shownontheperformancecurve(see
the Parts List Manual).
Pumps and related equipment must be in-
stalled and operated according to all na-
tional, local and industry standards.

MR--0488510 SERIES PUMPS
TROUBLESHOOTING PAGE B -- 1
TROUBLESHOOTING --- SECTION B
Review all SAFETY information in Section A.
Beforeattempting toopenorservice the
pump:
1. Familiarize yourself with this manual.
2. Disconnect or shut down the power
source and take the necessary pre-
cautions to ensure that the pump will
remain inoperative.
3. Allow the pump to completely cool if
overheated.
4. Check the temperature before open-
ing any covers, plates, or plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cautiously.
7. Drain the pump.
Table B-1 Troubleshooting Chart
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO PRIME Not enough liquid in casing.
Suction check valve contaminatedor
damaged.
Air leak in suction line.
Lining of suction hose collapsed.
Leakingorwornsealorpumpgas-
ket.
Suction lift or discharge head too
high.
Strainer clogged.
Addliquidtocasing.SeePRIMING.
Clean or replace check valve.
Correct leak.
Replace suction hose.
Check pump vacuum. Replace leak-
ingorwornsealorgasket.
Check piping installation and install
bypass line if needed. See INSTAL-
LATION.
Check strainer and clean if neces-
sary.
PUMP STOPS OR FAILS
TO DELIVER RATED
FLOW OR PRESSURE
Air leak in suction line.
Lining of suction hose collapsed.
Suction intake not submerged at
proper level or sump too small.
Correct leak.
Replace suction hose.
Check installation and correct sub-
mergence as needed.

MR--04885 10 SERIES PUMPS
TROUBLESHOOTINGPAGE B -- 2
Table B-1 Troubleshooting Chart (continued)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP STOPS OR FAILS
TO DELIVER RATED
FLOW OR PRESSURE
(cont.)
Impellerorotherwearingpartsworn
or damaged.
Leakingorwornsealorpumpgas-
ket.
Impeller clogged.
Pump speed too slow.
Pump running backwards (electric
motor driven models).
Suction lift or discharge head too
high.
Replace worn or damaged parts.
Check that impeller is properly cen-
tered and rotates freely.
Check pump vacuum. Replace leak-
ingorwornsealorgasket.
Free impeller of debris.
Check driver output; check belts or
couplings for slippage.
Check direction of rotation. Correct
3-phase wiring by interchanging any
two motor leads at control box. (See
Pump Rotation in the Installation
and Operations Manual.
Check piping installation and install
bypass line if needed. See INSTAL-
LATION in the Installation and Op-
erations manual.
PUMP REQUIRES TOO
MUCH POWER Pump speed too high.
Discharge head too low.
Liquid solution too thick.
Check driver output, check that
sheaves or couplings are correctly
sized.
Adjust discharge valve.
Dilute if possible.
PUMP CLOGS
FREQUENTLY Discharge flow too slow.
Suction check valve or foot valve
clogged or binding.
Open discharge valve filly to in-
crease flow rate, and run power
source at maximum governed
speed.
Clean valve.
EXCESSIVE NOISE Cavitation in pump.
Pumping entrained air.
Pump or drive not securely
mounted.
Impeller clogged or damaged.
Reduce suction lift and/or friction
losses in suction line. Record vacu-
um and pressure gauge readings
and consult local representative or
factory.
Locate and eliminate source of air
bubble.
Secure mounting hardware.
Clean out debris; replace damaged
parts.

MR--0488510 SERIES PUMPS
TROUBLESHOOTING PAGE B -- 3
PREVENTIVE MAINTENANCE
Sincepumpapplicationsareseldomidentical,and
pump wear is directly affected by such things as
the abrasive qualities, pressure and temperature
oftheliquidbeingpumped, thissectionisintended
only to provide general recommendations and
practices for preventive maintenance. Regardless
of the application however, following a routine pre-
ventive maintenance schedule will help assure
trouble-free performance and long life from your
Gorman-Rupp pump. For specific questions con-
cerning your application, contact your Gorman-
Rupp distributor or the Gorman-Rupp Company.
Record keeping is an essential component of a
good preventive maintenance program. Changes
in suction and discharge gauge readings (if so
equipped) between regularly scheduled inspec-
tions can indicate problems that can be corrected
before system damage or catastrophic failure oc-
curs.Theappearanceofwearingpartsshouldalso
bedocumentedat each inspectionforcomparison
as well. Also, if records indicate that a certain part
(such as the seal) fails at approximately the same
duty cycle, the part can be checked and replaced
beforefailureoccurs, reducingunscheduleddown
time.
For new applications, a first inspection of wearing
partsat250hourswillgiveinsightintothewearrate
foryourparticularapplication.Subsequentinspec-
tions should be performed at the intervals shown
on the chart below. Critical applications should be
inspected more frequently.
General Condition (Temperature, Unusual
Noises or Vibrations, Cracks, Leaks,
Loose Hardware, Etc.) I
Pump Performance (Gauges, Speed, Flow) I
Bearing Lubrication I R
Seal Lubrication (And Packing Adjustment,
If So Equipped) I R
V-Belts (If So Equipped) I
Air Release Valve Plunger Rod (If So Equipped) I C
Front Impeller Clearance (Wear Plate) I
Rear Impeller Clearance (Seal Plate) I
Check Valve I
Pressure Relief Valve (If So Equipped) C
Pump and Driver Alignment I
Shaft Deflection I
Bearings I
Bearing Housing I
Piping I
Driver Lubrication --- See Mfgr’s Literature
Legend:
I = Inspect, Clean, Adjust, Repair or Replace as Necessary
C= Clean
R= Replace
* Service interval based on an intermittant duty cycle equal to approximately 4000 hours annually.
Adjust schedule as required for lower or higher duty cycles or extreme operating conditions.
Preventive Maintenance Schedule
Item Daily Weekly Monthly Semi-
Annually Annually
Service Interval*

MR--04885 10 SERIES PUMPS
PAGE C -- 1
MAINTENANCE AND REPAIR
PUMP MAINTENANCE AND REPAIR --- SECTION C
GENERAL INFORMATION
Review all SAFETY information in Section A.
Followtheinstructionsonalltags,labelandde-
cals attached to the pump.
Before attempting to install, operate, or
service this pump, familiarize yourself
with this manual, and with all other liter-
ature shipped with the pump. Unfamil-
iarity with all aspects of operation or
maintenance could lead to destruction
of equipment, injury or death toperson-
nel.
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. If slingsor chainsare
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
The maintenance and repair instructions in this
manual are keyed to the sectional view, Figure
C --- 1 or C --- 2 and the corresponding parts identifi-
cation list. Refer to the separate Parts List Manual
for replacement parts.
Select a suitable location, preferably indoors, to
perform required maintenance.
This Maintenance and Repair Manual provides
troubleshooting and maintenance instructions re-
quiredto properlydiagnose operationalproblems,
and to service the pump components. Mainte-
nance instructions within this manualare limitedto
the pump hydraulic, priming and drive compo-
nents only.
Check TROUBLESHOOTING, Section B to deter-
mine causes and remedies of pump problems.
Disassemble the pump only as far as required.
As described in the SAFETY Section, this manual
willalert personnel toknown procedures which re-
quire specialattention, to those which could dam-
age equipment, and to those which could be dan-
gerous topersonnel. However, this manualcannot
possibly anticipate and provide detailed precau-
tions for every situation that might occur during
maintenanceoftheunit.Therefore,itistherespon-
sibility of the owner/maintenance personnel to en-
sure that only safe, established shop procedures
are used, and that any procedures not addressed
in this manual are performed only after establish-
ing that neither personal safety nor pump integrity
are compromised by such practices.
Lifting
Use lifting equipment with a capacity of at least
five times the weight of the pump, including the
weight of any options or customer-installed acces-
sories.Dischargehoseorpipingmustberemoved
before attempting to lift the pump.
For the approximate weight of your pump, refer to
the pump specification data sheet or contact your
Gorman-Rupp distributor or the Gorman-Rupp
Company.

10 SERIES PUMPS MR--04885
MAINTENANCE AND REPAIR
PAGE C -- 2
SECTION DRAWING
12D, 13E BACK
COVER DETAIL
13C CHECK
VALVE DETAIL
12D SEAL AREA DETAIL
Figure C---1. Typical 12D, 13A, 13C And 13E Pump End Assembly
w/Self Lubricated Seal

ITEM
NO. PART NAME ITEM NO. PART NAME
MR--04885 10 SERIES PUMPS
PAGE C -- 3
MAINTENANCE AND REPAIR
Typical 12D, 13A, 13C And 13E Pump End Assembly w/Self Lubricated Seal
Parts Identification List
Refer to the separate Parts List Manual for serviceable parts, part numbers and quantities.
1PUMPCASING
2 IMPELLER
3 SEAL ASSEMBLY
4PIPEPLUG
5FILLPLUGASSEMBLY
6NAMEPLATE
7 DRIVE SCREW
8 CASING GASKET SET
9STUD
10 HEX NUT
11 SHAFT EXTENSION
12 SHAFT SLEEVE
13 INTERMEDIATE ASSEMBLY
14 WEAR PLATE ASSEMBLY
15 HEX NUT
16 LOCK NUT
17 BACK COVER GASKET
18 CASING DRAIN PLUG
19 BACK COVER PLATE ASSEMBLY
20 ---PIPE PLUG (IF REQUIRED)
21 ---BACK COVER
22 --- WARNING PLATE
23 --- DRIVE SCREW
24 CLAMP BAR
25 CLAMP BAR SCREW
26 HEX HEAD CAPSCREW
27 LOCKWASHER
28 SUCTION FLANGE
29 PIPE PLUG (IF REQUIRED)
30 CHECK VALVE ASSEMBLY
31 ---ROUNDHEADMACHINESCREW
32 ---SMALL VALVE WEIGHT
33 --- LOCKWASHER
34 ---CHECK VALVE GASKET
35 ---LARGE VALVE WEIGHT ASSEMBLY
36 IMPELLER ADJUSTING SHIMS
37 SPRING CENTERING WASHER OR
SPRING RETAINER
38 SLINGER RING (IF REQUIRED)
39 FLAT WASHER
40 WING NUT
41 STUD

10 SERIES PUMPS MR--04885
MAINTENANCE AND REPAIR
PAGE C -- 4
SECTION DRAWING
13C CHECK
VALVE DETAIL
12D BACK
COVER DETAIL
Figure C---2. Typical 12B, 12C, 12D, 13A And 13C Pump End Assembly
w/Grease Seal

ITEM
NO. PART NAME ITEM NO. PART NAME
MR--04885 10 SERIES PUMPS
PAGE C -- 5
MAINTENANCE AND REPAIR
Typical 12B, 12C, 12D,13A and 13C Pump End Assembly w/Grease Seal
Parts Identification List
Refer to the separate Parts List Manual for serviceable parts, part numbers and quantities.
1PUMPCASING
2 IMPELLER
3 SEAL ASSEMBLY
4PIPEPLUG
5FILLPLUGASSEMBLY
6NAMEPLATE
7 DRIVE SCREW
8 CASING GASKET SET
9STUD
10 HEX NUT
11 SHAFT EXTENSION
12 SEAL LINER
13 INTERMEDIATE ASSEMBLY
14 WEAR PLATE ASSEMBLY
15 HEX NUT
16 LOCK NUT
17 BACK COVER GASKET
18 CASING DRAIN PLUG
19 BACK COVER PLATE ASSEMBLY
20 ---PIPE PLUG (IF REQUIRED)
21 ---BACK COVER
22 --- WARNING PLATE
23 --- DRIVE SCREW
24 CLAMP BAR
25 CLAMP BAR SCREW
26 HEX HEAD CAPSCREW
27 LOCKWASHER
28 SUCTION FLANGE
29 PIPE PLUG
30 CHECK VALVE ASSEMBLY
31 ---ROUNDHEADMACHINESCREW
32 ---SMALL VALVE WEIGHT
33 --- LOCKWASHER
34 ---CHECK VALVE GASKET
35 ---LARGE VALVE WEIGHT ASSEMBLY
36 IMPELLER ADJUSTING SHIMS
37 NOT REQUIRED
38 NOT REQUIRED
39 FLAT WASHER
40 WING NUT OR MACHINE BOLT
41 STUD
42 SUCT FLANGE GSKT (IF REQUIRED)
43 CHECK VALVE PIN (IF REQUIRED)
44 DISCHARGE ELBOW (IF REQUIRED)
45 GREASE CUP
46 PIPE COUPLING
47 PIPE NIPPLE

10 SERIES PUMPS MR--04885
MAINTENANCE AND REPAIR
PAGE C -- 6
PUMP AND SEAL DISASSEMBLY
AND REASSEMBLY
Review all SAFETY information in Section A.
Followtheinstructionsonalltags,labelandde-
cals attached to the pump.
This pump requires little service due to its rugged,
minimum-maintenance design. However, if it be-
comesnecessarytoinspectorreplacethewearing
parts, follow these instructions which are keyed to
thesectionalviews(seeFigureC---1orC---2)and
the accompanying parts list. Unless otherwise
specified, the instructions apply to either Figure
C --- 1 or Figure C --- 2.
Beforeattemptingtoservicethepump,disconnect
or lock out the power source and take the neces-
sary precautions to ensure that the pump will re-
main inoperative. Close all valves in the suction
and discharge lines.
For power source disassemblyand repair, consult
the literature supplied with the power source, or
contact your local source representative.
This manual will alert personnel to
known procedures which require spe-
cial attention, to those which could
damage equipment, and to those which
could be dangerous to personnel.How-
ever,thismanualcannotpossiblyantici-
pate and provide detailed instructions
and precautions for every situation that
might occur during maintenance of the
unit.Therefore,it is the responsibility of
the owner/maintenance personnel to
ensurethatonlysafe, established main-
tenance procedures are used, and that
any procedures not addressed in this
manual are performed only after estab-
lishing that neither personal safety nor
pump integrity are compromised by
such practices.
Beforeattemptingtoopenorservicethe
pump:
1. Familiarize yourself with this man-
ual.
2. Disconnect or shut down the pow-
er source and take the necessary
precautions to ensure that the
pump will remain inoperative.
3. Allow the pump to completely cool
if overheated.
4. Check the temperature before
opening any covers, plates, or
plugs.
5. Close the suction and discharge
valves.
6. Vent the pump slowly and cau-
tiously.
7. Drain the pump.
If the pump is designed to pump materi-
alswhich could cause serious illness or
injury through direct exposure or
emitted fumes, wear protective cloth-
ing, such as rubber gloves, face mask,
and rubber apron, as necessary before
disassembling the pump or piping.
SuctionCheckValveRemovalandDisassembly
(Figure C--1 or Figure C--2, Models 12B, 12C,
12D, 13A, And 13E)
Beforeattemptingtoservicethepump, removethe
pump casing drain plug (18) and drain the pump.
Clean and reinstall the drain plug.
To service the suction check valve assembly (30),
remove the suction piping. Remove the hardware
(26 and 27) securing the suction flange (28) and
check valve assembly (30) tothe pump casing (1).
Separate the check valve assembly from the suc-
tion flange.
Inspect the check valve parts for wear or damage.
If replacement is required, remove the hardware

MR--04885 10 SERIES PUMPS
PAGE C -- 7
MAINTENANCE AND REPAIR
(31 and 33), and separate the check valve gasket
(34) and weights (32 and 35).
Suction Check Valve Removal
(Figure C--2, Model 13C)
If the check valve assembly (30) is to be serviced,
removethehardware(26and27)securingthesuc-
tion flange (28). Remove the check valve pin (43)
and pull the complete assembly from the suction
flange. Remove the suction flange gasket (42).
NOTE
Further disassembly of the check valve is not re-
quiredsinceitmustbereplacedasacompleteunit.
Individual parts are not sold separately.
If no further disassembly is required, see Suction
Check Valve Installation.
Back Cover Removal
(Models 12B, 12C, 13A And 13C)
The wear plate assembly (14) is easily accessible
and may be serviced by removing the back cover
(19). Loosenthe clamp bar screw (25) andremove
the clamp bar (24). Pull the back cover and wear
platefromthepumpcasing. Removethe backcov-
er gasket (17). Clean the mating surfaces of the
back cover plate and pump casing.
Inspectthewearplateandreplaceitifbadlyscored
or worn. To remove the wear plate, disengage the
hardware (15and 16) securingit tothe back cover.
If no further disassembly is required, see Back
Cover Installation.
Back Cover Removal
(Models 12D And 13E)
The wear plate (14) can be serviced after theback
cover assembly (19) has been removed.
Removethewingnutsandwashers(39and40)se-
curing the back cover to the casing. Pull the back
cover and wear plate from the pump casing (1).
Inspect the wear plate for excessive wear or scor-
ing. If replacement is required, remove the hard-
ware (15 and 16) securing it to the back cover.
Remove the cover plate gasket (17) and clean the
mating surfaces.
If no further disassembly is required, see Back
Cover Installation.
Pump Casing Removal
To service the impeller or seal assembly, discon-
nect the discharge piping. Remove the hardware
securing the pump casing to the base. Tie and tag
anylevelingshimsusedunderthepumpmounting
feet to ease reassembly.
Disengage the hardware securing the pump cas-
ing to the hoisting bail. Support the pump casing
using a suitable hoist and sling, and remove the
nuts (10) securing the pump casing to the inter-
mediate (13). Separate the pump casing and gas-
ket set(8) from theintermediate bypulling thecas-
ing straight away. Clean the matingsurfaces of the
intermediate and pump casing. Tie and tag the
gaskets, or measure and recordtheir thickness for
ease of reassembly.
Impeller Removal
Ifthe pumpisequippedwithagreaseseal,turnthe
cross arm on the automatic lubricating grease cup
(45, Figure C---2) clockwise until it rest against the
cover (see Figure C---5) before attempting to re-
move the impeller (2). This will prevent the grease
in the cup from escaping when the impeller is re-
moved.
To loosen the impeller (2), tap the vanes of the im-
pellerin acounterclockwise direction (when facing
the impeller) with a block of wood or a soft-faced
mallet. Unscrew the impeller using caution; ten-
sion on the seal spring will be released as the im-
peller is unscrewed.
Inspect the impeller and replace it if cracked or
badlyworn. Slidethe impelleradjusting shims (36)
offtheimpellershaft.Tieandtagtheshimsormea-
sure and record their thickness for ease of reas-
sembly.

10 SERIES PUMPS MR--04885
MAINTENANCE AND REPAIR
PAGE C -- 8
SelfLubricatedSealRemovalAndDisassembly
(Figures C--1 and C--3)
Remove the spring centering washer or spring re-
tainer (37) and seal spring. Slide the shaft sleeve
(12) and rotating portion of the seal off the shaft as
a single unit. Apply oil to the sleeve and work it up
under the bellows. Slide the rotating portion of the
seal off the shaft. Use a pair of stiff wires with
hooked ends to remove the assembled stationary
seat from the intermediate (13).
NOTE
An alternate method of removing the seal assembly
is to remove the hardware securing the intermedi-
ate to the power source and slide the intermediate
and seal assembly off the shaft as a single unit.
Place the intermediate on a flat surface with the im-
peller side down. Use a suitable sized dowel to
press the seal components from the intermediate.
Remove the slinger ring (38). If required, remove
the intermediate as described above.
If no further disassembly is required, see Self Lu-
bricated Seal Installation.
Grease Seal Removal and Disassembly
(Figures C--2 and C--4)
To remove the seal assembly (3), remove the
grease cup and piping(45, 46 and 47) from the in-
termediate.
Carefully remove the outer stationary and rotating
seal elements, packing ring, stationary washer,
seal spring, and spacer sleeve from the intermedi-
ate.Usingtwostiffwireswithhookedends,remove
the inboard stationary washer, packing ring and
stationary and rotating seal elements.
NOTE
The seal assembly may also be removed by disen-
gaging the hardware securing the intermediate to
the power source and sliding the intermediate and
seal assembly off the shaft as a single unit. Use a
dowelofsuitablesizetopressthesealcomponents
from the intermediate.
Inspectthesealliner(12)forwearorgrooves
which could cause leakage or damage to the seal
packing rings. The seal liner is a press fit in the in-
termediate and does not normally require replace-
ment. If replacement is necessary, separate the in-
termediate from the power source as described
above.
If the seal liner needs replaced, see Seal Reas-
sembly and Installation.
If no further disassembly is required, see Grease
Seal Reassembly and Installation.
Self Lubricated Seal Installation
(Figures C-1 and C--3)
Clean the sealcavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Inspect the shaft (11) fordamage. Smallscratches
or nicks may be removed with a fine file or emery
cloth. Ifexcessivewear exists,the shaft willhave to
be replaced. (Refer to the power source service
manual).
The seal is not normally reused because wear pat-
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure.Ifnecessarytoreuseanoldsealinanemer-
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shortenseallife.Ifnecessary,cleanthefaceswitha
non-oil based solvent and a clean, lint-free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, andother damage thatmight cause leak-

MR--04885 10 SERIES PUMPS
PAGE C -- 9
MAINTENANCE AND REPAIR
age. Clean and polish the shaft sleeve (12), or re-
placeitiftherearenicksorcutsoneitherend.Ifany
components are worn, replace the complete seal;
never mix old and new seal parts.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
To ease installation of the seal, lubricate the as-
semblied stationary seat and shaft sleeve with
water or a very small amount of oil, and apply a
drop of light lubricating oil on the finished faces.
Assemblethesealasfollows,(seeFigureC---3).
ROTATING ELEMENT
SLEEVE
STATIONARY
SEAT
SHIMS
SPRING CENTERING
WASHER OR SPRING
RETAINER
DRIVE BAND
SLINGER RING
BELLOWS
O-RING IF EQUIPPED
SPRING
Figure C--3. Self Lubricated Seal Assembly
This seal is not designed for operation at
temperatures above 160_F(71_C). Do not
use at higher operating temperatures.
If the intermediate (13) was removed, position the
intermediate over the shaft and secure it to the
power source with the previously removed hard-
ware.
If used, install the slinger ring (38) on the shaft.
Press the assembled stationary seat into the inter-
mediate until the stationary seat bottoms against
the intermediate bore. A push tube cut from a
length of plastic pipe would aid this installation.
The I.D. of the pipe should be approximately the
same diameter as the I.D. of the seal spring.
Slide the rotating subassembly (consisting of the
rotating element, retainer and bellows)onto thelu-
bricated shaft sleeve until the rotating element is
just flushwith theendofthe sleevewith thecham-
fered I.D. Slide the sleeve and rotating subassem-
bly onto the shaft untilthe seal faces contact. Con-
tinuetopushthesleevethroughthesealuntilitbot-
toms against the shaft shoulder.
Installthe seal spring andspring centeringwasher
or spring retainer (37).
Grease Seal Reassembly and Installation
(Figures C--2 and C--4)
Before installing the seal, inspect the bore of the
sealliner(12)forwearorgrooveswhichmight
cause leakage or damage to the seal packing
rings.Iftheseallinermustbereplaced,removethe
intermediate as described in Seal Removal And
Disassembly, and position it on the bed of an ar-
bor (or hydraulic) press. Use a new sleeve to force
theoldoneout.Afterthenewlinerisproperlyin-
stalled, drill a 1/4-inch diameter hole through the
liner to permit the flow of lubricant to the seal as-
sembly. Be careful to center the drill in the
threaded grease piping hole and not damage the
threads. Deburr the hole fromthe insideof the seal
liner after drilling.
Inspect the shaft for damage. Small scratches or
nicks may be removed with a fine file or emery
cloth. Ifexcessivewear exists,the shaft willhave to
be replaced. (Refer to the engine or motor service
manual).
Position the intermediate (13) against the power
source and secure it in place using the previously
removed hardware.
Clean the sealcavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,

10 SERIES PUMPS MR--04885
MAINTENANCE AND REPAIR
PAGE C -- 10
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
The seal is not normally reused because wear pat-
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure.Ifnecessarytoreuseanoldsealinanemer-
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shortenseallife.Ifnecessary,cleanthefaceswitha
non-oil based solvent and a clean, lint-free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, andother damage thatmight cause leak-
age. Clean and polish the seal liner, or replace it if
thereare nicks or cuts on either end. If anycompo-
nents are worn, replace the complete seal; never
mix old and new seal parts.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
SHAFT
SE
A
L
LINER
IMPELLER
IMPELLER
SHIMS
STATIONARY WASHERS
ROTATING
ELEMENT
SPRING SEAL PLATE
PACKING
RING
SPACER
SLEEVE
STATIONARY
ELEMENT
Figure C--4. Grease Seal Assembly
To ease installation of the seal, lubricate the pack-
ing rings and seal liner with water or a very small
amount of oil, and apply a drop of light lubricating
oil on the finished faces. Assemble the seal as fol-
lows,(seeFigureC---4).
This seal is not designed for operation at
temperatures above 110_F(43_C). Do not
use at higher operating temperatures.
The position for the inboard rotating element is de-
termined by the machining of the impeller shaft at
the shoulder where the element seats. If there is a
radius on the shaft, position the inboard element
with the I.D. chamfer toward the shaft shoulder. If
the shaft is undercut at the shoulder, position the
inboard element with the I.D. chamfer away from
the shoulder.
Subassemble the inboard stationary element,
packing ring and seal washer. Press this unit into
thelubricatedseallineruntilthesealfacescontact.
A push tube cut from alength ofplasticpipewould
aid this installation. The I.D. of the tube should be
approximately the same as the the I.D. of the seal
spring.
Install the spacer sleeve and seal spring.
Subassemble the outboard stationary element,
packing ring and seal washer. Press this unit into
the lubricated seal liner.
Install the outboard rotating element with the
chamfered side toward the impeller end of the
shaft.
Install the grease cup and the piping (45, 46 and
47) in the intermediate.
After the impeller has been installed, lubricate the
seal as indicated in LUBRICATION at the end of
this section.
NOTE
Some smoking and leakage may occur after instal-
linga newseal assembly.This should stop afterthe
pump has run a while and the lapped seal faces
have seated in.
Impeller Installation And Adjustment
Inspect the impeller, and replace it if cracked or
badly worn. Install the same thickness of impeller