Waterous E501-A Installation guide

E500 Series Motor Pump
Operation, Maintenance
and Overhaul Instructions
Form No.
F-2390
Issue Date
09/04
Rev. Date
3/27/17
Table of Contents
W
Read through the safety information and
operating instructions carefully before
using your Waterous Fire Pump.
Visit us at www.waterousco.com
Waterous Company 125 Hardman Avenue South, South St. Paul, Minnesota 55075 USA [phone]
Instructions subject to change without notice.
E511 Impeller and Mechanical Seal Removal -------------------- 8
Safety Instructions ------------------------------------1, 2
Introduction -------------------------------------------------3 E501 Gear Case Cover and Impeller Shaft Removal---------- 8
Installation ------------------------------------------------ 3 E511 Gear Case Cover and Impeller Shaft Removal-------------9
Fire Hose Testing----------------------------------------4 E501 Impeller Shaft Assembly------------------------------------------9
Maintenance and Repair------------------------------- 5 E511 Impeller Shaft Assembly----------------------------------------10
Preparation----------------------------------------------- 5 E501, E511 Gear Case Removal-------------------------------------10
Operation----------------------------------------------- 5 E501, E511 Engine Adapter Removal-------------------------------11
Starting the Engine--------------------------------------5 E501, Mechanical Seal Assembly------------------------------------11
Priming the Pump--------------------------------------- 5 E511 Mechanical Seal Assembly-------------------------------------12
Setting the Throttle---------------------------------------5 Inspection----------------------------------------------------------------------13
Engine Maintenance------------------------------------ 6 Impeller Wear--------------------------------------------------------------13
Pump Maintenance------------------------------------- 6 Mechanical Seal-----------------------------------------------------------13
Engine Repair------------------------------------------- 6 Oil Seals---------------------------------------------------------------------13
Pump Repair--------------------------------------------- 6 Reassembling and Testing-----------------------------------------------13
Overhaul----------------------------------------------------- 7 Reassembling the Pump------------------------------------------------13
E501 Volute Body Removal------------------------ 7 Testing-----------------------------------------------------------------------14
E511 Volute Body Removal------------------------ 7
E501 Impeller and Mechanical Seal Removal

Page 1 of 14 SAFETY INSTRUCTIONS
! WARNING
Proposition 65 Warning.
Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth
defects and other reproductive harm.
! WARNING
Excessive speed notice. May cause personal injury.
Operating an engine at excessive high speeds increases the danger of personal injury. Do not tamper with the
governor springs, governor links or other parts which may cause an increase in governed engine speed. Do not
tamper with the engine speed selected by the original equipment manufacturer.
! WARNING
Scalding Water Hazard. May result in serious burns.
When operating the pump, be sure to open at least one discharge valve slightly to prevent the pump from
overheating. If the pump runs for a few minutes completely closed, it may heat the water enough to scald
someone when the valve is opened. Overheating can damage the packing, seals and other pump parts. If the
apparatus builder has installed a by-pass system or other provision designed to prevent overheating, opening
a discharge valve may be unnecessary.
! WARNING
Pressure Hazard. May result in personal injury.
Prior to connection or removal of hoses, caps or other closures with pump intake or pump discharge connec‐
tions, relieve pressure by opening drains.
! WARNING
Death or serious personal injury might occur if proper operating procedures are not followed. The pump
operator, as well as individuals connecting supply or discharge hoses to the apparatus must be familiar with
these pump operating instructions as well as other operating instructions and manuals for the apparatus, water
hydraulics and component limitation.
! DANGER
Exhaust gas and fire hazard. Can cause illness, personal injury or death.
1. DO NOT run the engine in an enclosed area. Exhaust gases contain carbon monoxide, an odorless, deadly
poison.
2. Refuel outdoors or only in well ventilated areas.
3. DO NOT operate the engine when an odor of fuel is present or other explosive conditions exist.
4. If fuel is spilled, move machine away from the area of the spill and avoid creating any source of ignition until
the fuel has evaporated.
5. DO NOT STORE, SPILL OR USE FUEL NEAR AN OPEN FLAME, or devices such as a stove, furnace or
water heater which utilize a pilot light or devices which can create a spark.
6. DO NOT OPERATE ENGINE WITHOUT A MUFFLER. Inspect muffler periodically and replace, if necessary.
7. Periodicallyclean the muffler area to prevent grass, dirt and combustible material from accumulating.
8. DO NOT use this unit on forest covered, brush covered or grass covered unimproved land unless a spark
arrester is attached to the muffler.
9. DO NOT operate the engine if air cleaner or air cleaner cover is removed.

SAFETY INSTRUCTIONS Page 2 of 14
WARNING
Hose Testing Hazard. May result in serious personal injury.
Due to a potential for catastrophic hose failure during service testing of fire hose, it is vital that safety precautions be
taken to prevent exposure of anyone to this danger. Fire pumps on fire department apparatus are not designed for
and should not be used for service testing of fire hoses. Hose testing machines should be used for service testing of
fire hoses.
WARNING
Pressure Hazard. May result in serious personal injury.
If a fire pump on a fire department apparatus is used for service testing of fire hoses, the procedures in NFPA 1962
MUST be followed including the use of a fire department gate valve with a ¼-inch (6 mm) hole drilled through the
gate installed between the fire apparatus discharge outlet and the hose test layout to prevent a volume surge from
the pump in the event a hose bursts during testing.
WARNING
Scalding Water Hazard. May result in serious burns.
If a fire pump on a fire department apparatus is used for service testing of fire hoses, pump discharge water must be
circulated through a by-pass system or discharged through a slightly open discharge valve, or some other provision
must be used to prevent overheating. If the pump runs for a few minutes without adequate flow through the pump,
water may be heated enough to scald someone when a valve is opened.
! WARNING
Moving or rotating parts hazard. May cause personal injury.
Always keep hands and feet clear of moving or rotating parts to prevent injury.
! WARNING
Spark arrestor notice.
If this engine is equipped with a spark arrestor for use on forest covered, brush covered unimproved land, it must
be maintained in effective working order by the operator. In the state of California, the above is required by law
(Section 4442 of the California Public Resources Code.) Other states may have similar laws.
! WARNING
Accidental starting hazard. May cause personal injury to the hand, arm or feet.
When servicing the engine or equipment, always disconnect the negative wire from the battery terminal to prevent
accidental starting.
! WARNING
High temperature components. May cause severe burns.
Do not touch hot mufflers, cylinders or fins as contact may cause burns.

Page 3 of 14 INTRODUCTION
Waterous E500 Motor Pumps are gear driven centrifu‐
gal pumps powered by a three-cylinder, 952 cc diesel
or gasoline Briggs & Stratton Vanguard engine.
An optional remotely mountable instrument panel and
a priming system consisting of either a Waterous'
hand or electric primer are available.
The model numbers below define the different pump
designations.
Table 1. Pump Model Designations
Pump
Model
Optional
Instrument
Panel
Engine
Type
Intake
Discharge
E501-A
Deluxe
Engine or
Municipal
Diesel
2” female
NPT
1-1/2” female
NPT
E511-A
Deluxe
Engine or
Municipal
Diesel
3” female
NPT
2” female NPT
E511-B
Municipal
Gasoline
3” female
NPT
2” female NPT
These instructions are to be used for placing the
pumping unit into operation, maintenance and repair
of the pump. Refer to the Briggs & Stratton Operation
and Maintenance instructions for maintenance of the
engine. Major repairs of the engine can be taken care
of by an authorized Briggs & Stratton dealership.
Installation
1. Battery cable - The correct wire gage depends on
the length of cable needed. Use the following
chart to determine what size battery cable to use:
2. Fuel line - Route the fuel line from the fuel tank
(not supplied by Waterous) such that low pockets
in which water could accumulate and freeze, and
high pockets where fuel vapors could collect and
restricttheflowof liquid fuel(vapor lock) are elim‐
inated. Avoid potential rubbing and high heat
areas,anduseadequateconnectorsandre‐
straints to avoid acccidental disconnecting of fuel
lines.
3. The maximum vertical lift the fuel pump can
achieve is two feet (610 mm) with any length fuel
line. On diesel engines, be sure the return line
reaches the bottom of the fuel tank to prevent air
bubbles (see pump dimensional drawing for fuel
return outlet on engine).
4. Mounting - Briggs & Stratton recommends an
isolationmountfortheenginetominimizevibra‐
tion.
5. Air Flow - keep the front of the radiator unob‐
structed to allow for adequate air flow. The fan
pulls air across the radiator and then pushes the
outside air over the engine.
6. Primingsystem - Seeoptionalprimingpump in‐
struction, F-1031, Section 3023, Priming System
Installation Instructions.
7. Emission label - If emission control label, located
on engine cylinder head, is not visible on engine
after installation, the loose label provided must be
appliedsuchthatitis visiblewhenengineisac‐
cessed, per EPA/CARB requirements.
Maximum Length (ft.)
Minimum Wire Gage Size
2
4
3.5
2
4
1
5.5
1/0
7
2/0
8.5
3/0
11
4/0

Page 4 of 14
Fire Hose Testing
WARNING
Hose Testing Hazard. May result in serious personal injury.
Due to a potential for catastrophic hose failure during service testing of fire hose, it is vital that safety precautions be
taken to prevent exposure of anyone to this danger. Fire pumps on fire department apparatus are not designed for
and should not be used for service testing of fire hoses. Hose testing machines should be used for service testing of
fire hoses.
NFPA 1962 Standard for the Inspection, Care, and use of Fire Hose, Couplings, and Nozzles and the Service
Testing of Fire Hose provides requirements and testing procedures for service-testing fire hose at least annually.
NFPA 1962 includes procedures for service testing with either a hose testing machine or with a pump on a fire
department fire apparatus. WARNING
Pressure Hazard. May result in serious personal injury.
If a fire pump on a fire department apparatus is used for service testing of fire hoses, the procedures in NFPA 1962
MUST be followed including the use of a fire department gate valve with a ¼-inch (6 mm) hole drilled through the
gate installed between the fire apparatus discharge outlet and the hose test layout to prevent a volume surge from
the pump in the event a hose bursts during testing.
During fire hose testing with a fire pump on a fire department fire apparatus, the fire pump is required to be operated
at high discharge pressure with little or no flow out of the apparatus.
WARNING
Scalding Water Hazard. May result in serious burns.
If a fire pump on a fire department apparatus is used for service testing of fire hoses, pump discharge water must be
circulated through a by-pass system or discharged through a slightly open discharge valve, or some other provision
must be used to prevent overheating. If the pump runs for a few minutes without adequate flow through the pump,
water may be heated enough to scald someone when a valve is opened.
CAUTION
If a fire pump on a fire department apparatus is used for service testing of fire hoses, operating the pump at high
discharge pressure with little or no flow may result in severe damage to the pump.

MAINTENANCE AND REPAIR Page 5 of 14
Preparation
NOTE:Enginesareshippedwithoutoil andcool‐
ant. These must be added before operating.
1. Inspect the unit for damage resulting from ship‐
ping. Operation of a damaged unit may result in
severe damage to the pump or engine.
2. The E500 is shipped without the battery. Install a
12 VDC battery with a minimum capacity of 380
Amps (63 Amp-hours).
3. Fill the engine crankcase with the specified
amount of oil as stated in the Briggs & Stratton
Operation and Maintenance instructions.
4. Fill radiator and reservoir with the water/antifreeze
mixturespecifiedintheBriggs&StrattonOpera‐
tion and Maintenance Instructions.
5. Fill the transmission with 1 pint of SAE 90 oil
through the top plug or breather elbow. Remove
oil level plug to check oil level.
6. Fill the fuel tank with fuel as recommended in the
Briggs & Stratton Operation & Maint. instructions.
7. Rotate the engine crankshaft by turning the igni‐
tion switch to the START position (without press‐
ing the manual reset button on the tattletale sys‐
tem, if equipped). This will ensure the engine and
pump turn freely with no abnormal rubbing noises.
Operation
Operation of the E500-A consists ofmakingthe prop‐
er connections to the pump intake and discharge,
starting the engine, priming the pump, if necessary,
and setting the engine throttle to achieve the desired
performance.
Connections
Connectionsbetweenthepumpintakeandpumpdis‐
charge hoses or piping must be made leak proof.
When pumping units are permanently mounted in an
apparatus and attached to rigid piping, connections
between the pump and the piping should be made
with flexible coupling to avoid applying excessive
forces to the pump.
NOTE: Refer to the Briggs & Stratton Instruction
Manual for further details on starting the engine.
Starting the Engine
E501-A and E511-A w/Deluxe Engine Panel
Pump the fuel filter primer until hard to push. Turn the
ignition switch to the RUN position and wait for the
glow lamp to shut off. Once the glow lamp is no longer
lit, hold down the manual reset button and turn the
ignitionswitchtotheSTARTposition.Whentheen‐
gine has started, continue holding the reset button
until a sufficient oil pressure has been obtained
(above 5 psi).
Starting the Engine
E501-A and E511-A w/Municipal Panel
Pump the fuel filter primer until hard to push. Turn the
ignition switch to the RUN position and wait for the
glow lamp to shut off. Once the glow lamp is no longer
lit, turn the ignition switch the the START position and
hold until the engine starts.
Starting the Engine
E511-B
Pull the choke knob and turn the ignition switch to the
START position until the engine starts. Adjust the
choke as needed.
Priming the Pump (All Models)
Always use an intake strainer to avoid pump damage
caused by foreign matter. To prime the pump, see
optional priming pump instructions, F-1031, Section
2312, Operation and Maintenance Instructions for
Priming Systems.
Setting the Engine Throttle (All Models)
Adjust the engine throttle as desired after the pump is
primed.
WhenyouarefinishedusingtheE500,returntheen‐
gine speed to idleand turn the switch to the OFF posi‐
tion.Makesurethat youdrainthe water from thevo‐ lute
body by opening the drain cock below the pump.
RefertotheBriggs&StrattonOperationandMainte‐
nanceinstructionsforenginemaintenancerequire‐
ments. Note that maximum pump performance will not
be achieved unless the engine is properly maintained.
CAUTION
The pump is equipped with a mechanical seal.
Excessive heat generated by running the pump dry
may damage seal.
! WARNING
Low oil.Mayresult inenginepowerloss,per‐
sonal injury or property damage.
Maintain correct oil level. Check oil level each time
the engine is refueled.

Page 6 of 14 MAINTENANCE AND REPAIR
Engine Maintenance
RefertotheBriggs&StrattonOperationandMainte‐
nance instructions for maintenance information.
Pump Maintenance
• Drain the volute body after each use. If the pump
has been handling chemicals, salt water or dirty
water, flush the entire system with clean, fresh
water for several minutes to remove all traces of
impurities.
• Check gear case oil level monthly. Fill as needed.
• Change gear case oil yearly or every 100 hours of
pump operation, whichever comes first. Remove
magneticdrainpluganddisposeofoldoilproper‐
ly. Replace drain plug and fill as described above
in “Preparation” section of this manual.
Engine Repair
If engine service or repair is needed, refer to the
Briggs&StrattonOperationandMaintenanceinstruc‐
tionsforinformation.Notethatthecontrolpanel,wir‐
ing harness and pump drive system are not furnished
bytheenginemanufacturer.RefertoWaterousCom‐
pany Service Parts List supplied with the pump for
these parts.
Pump Repair
Pump repair should be done by Waterous authorized
service personnel. Alternatively, pump repair parts
can be purchased from Waterous Company and
installed by any mechanic familiar with pump overhaul
and repair practices and procedures. Service Parts
Lists are provided which give parts descriptions and
reference numbers for ordering. Be sure to give the
pump model, serial number and parts list number
when ordering parts.
ContactyourWaterousdealer,orcallaWaterousser‐
vice specialist at 651-450-5200 with any questions.

Page 7 of 14 OVERHAUL
Figure 1. E501 Volute Body Removal Figure 2. E511 Volute Body Removal
Remove (4) hex head screws from the pump volute body.
Slide the volute body off the gear case cover. Wear ring
will come off with volute. Remove if required.
The engine and control panel are shown removed for
clarity.
Remove the (4) hex nuts and lock washers
attaching the volute body to the gear case cover.
Wear ring will come off volute. Remove if
required.
The engine and control panel are shown removed for
clarity.
Figure 4. E501 Impeller and Mechanical Seal Removal
IL1920
1. Remove impeller nut and washer from the impeller shaft.
If the impeller does not pull off the impeller shaft easily,
use a gear puller or two pry bars between the impeller and
adapter. Remove the impeller key. Remove mechanical
seal assembly from impeller hub. The stationary seal ring
will remain with the gear case cover.
2. Drain oil from gear case.

OVERHAUL
Page 8 of 14
Figure 3. E511 Impeller and Mechanical Seal Removal
1. Remove the impeller nut and washer from the impeller
shaft. If the impeller does not pull off the impeller shaft
easily, use a gear puller or two pry bars between the im‐
peller and adapter. Remove the impeller key.
2. Use snap ring pliers to remove the retaining ring. The me‐
chanical seal can then be removed. Note: Do not reuse
the retaining ring. The stationary ring will remain with the
gear case cover.
3. Drain oil from gear case.
Figure 5. E501 Gear Case Cover and Impeller Shaft Removal
1. Remove the impeller gasket.
2. Remove the 10 hex head screws and lock
washers from the gear case cover.
3. Remove the gear case cover from the gear
case. Press out the impeller shaft and bear‐
ing assembly from the gear case cover.
4. Remove gear case gasket.
5. Press out the mechanical seal stationary seal
ring, oil seal. Pull wear ring if required.

Page 9 of 14 OVERHAUL
Figure 7. E501 Impeller Shaft Assembly
1. The impeller shaft assembly with the
ball bearing should not require dis‐
assembly unless inspection reveals
wear of the ball bearing.
2. Using a suitable sleeve, press the
bearing off the impeller end of the
shaft.
Figure 6. E511 Gear Case Cover and Impeller Shaft Removal
1.
2.
Remove the 10 hex head screws and lock
washers from the gear case cover.
Remove the gear case cover from the gear
case. Press out the impeller shaft and bear‐
ing assembly from the gear case cover.
Remove gear case gasket.
Press out the mechanical seal stationary seal
ring, oil seal. Pull wear ring if required.
3.
4.

OVERHAUL
Page 10 of 14
Figure 9. E501, E511 Gear Case Removal
1. Remove the drive gear/shaft assembly.
Note: The drive shaft / gear assembly is
available for replacement from Waterous.
Disassembly is not always required.
2. Remove innter race of bearing from end of
drive shaft.
3. Remove the self locking nut that holds the
drive gear to the driveshaft.
4. Press the drive gear off the shaft.
5. Remove the key.
6. Remove the (4) socket head screws and
washers holding the gear case to the engine
adapter.
7. Remove the gearcase. Press outthe oilseal.
Shaft is already out of case.
8. Clean the magnetic drain plug and check to
be sure the breather is not plugged.
helpful hints.
IL1899
.
Figure 8. E511 Impeller Shaft Assembly
1.
2.
The impeller shaft assembly with the ball bearing
should not require disassembly unless inspection
reveals wear of the ball bearing.
If removing the ball bearing, grease the shaft sur‐
face, then using a suitable sleeve, press the bear‐
ing off the impeller end of the shaft.
Note: The impeller shaft/ball bearing as‐
sembly is available from Waterous. If the ball
bearing is not pressed on by Waterous, see
the Reassembling section of this manual for

Page 11 of 14 OVERHAUL
Figure 10. E501, E511 Engine Adapter Removal
Note: The engine adapter and the drive plate assembly
should not require disassembly unless inspection reveals
wear of the drive plate.
1. Remove the M10 and 5/16 bolts from the engine adapter
(Note: The starter is supported by two of the M10 bolts)
to separate the engine adapter from the engine.
2. Separate the drive plate from the engine by removing the
M8 screws.
Figure 11. E501 Mechanical Seal Assembly

OVERHAUL
Page 12 of 14
Figure 12. E511 Mechanical Seal Assembly
Spring Assembly
If Lubricant or Other Foreign Material Should
Get on Sealing Faces, Wipe it Off with
Rubbing Alcohol and a Soft Cloth
IL2599
Coat Inside of Bellows
with Mechanical Seal
Lubricant Before Installing
O-ring Side Away From
Bellow Assembly, Coat
O-ring with Mechanical
Seal Lube Before
Installing in Head
Primary Ring Stationary Ring
Sealing Surface Must Face Primary Ring
Note: If Waterous Mechanical Seal Lubricant Pat No. 52608
is not Available, P80 Rubber Lubricant, Straight Dish
Soap or Glycerin May be Substituted.

CAUTION
The mechanical seal primary and stationary rings are made
of brittle material. The material can be cracked or chipped.
Extra care must be taken whenhandling these rings.
INSPECTION Page 13 of 14
After the pump has been disassembled, check the following before reassembly:
Impeller Wear
1. Check the wear hubs on the impeller for excessive
wear,orclearancewiththewearrings.If the clear‐
ance exceeds 0.020/0.025in., or if the impeller hubs
are badly scored or grooved, replace the impeller and
wear ring.
2. Check all O-rings for cuts,nicks, or other damage.
Mechanical Seal
1. When a pump is disassembled, it is advisable to in‐
stallanewmechanicalsealduringreassembly,espe‐
cially if the pump had been in service for a long period
of time.
Reassembling thepumpis basicallythereverseofdisas‐
sembly. The following guidelines will help in reassembly.
1. Lubricate all O-rings when installing.
2. Checktheshaftsurfaceinthearea under theme‐
chanical seal bellows to be sure it is free of severe
scratches or other damage. Also check the impeller
hub in the area under the mechanical seal to be sure
it is free from scratches or other damage.
Oil Seals
Check theimpeller shaftanddrive shaft for signs of se‐
vere wear from the oil seal.
Ball Bearing, Gears and Needle Bearings
Check for severe wear and replace as necessary.
REASSEMBLING AND TESTING PUMP
2. When installing mechanical seal stationary ring, be
careful not to scratch the sealing surface that contacts
the polished primary ring.
3. If replacing a needle bearing, be sure the inner race
matches the bearing (the two pieces should be flush
when assembled).
Reassembling the Pump
1. Reassemblenewdriveplatetotheflywheel(ifneces‐
sary) and fasten engine adapter to the engine.
2. Fasten engine adapter to the face plate on the engine
using two of the M10 bolts to attach the starter motor.
3. Before installing an oil seal in a housing, apply a thin
coat of sealant to housing oil seal seat. (Waterous
recommends Loctite Ultra Blue RTV Silicon Sealant to
Permatex Super 300). Be sure that the seal, shaft and
gear case are clean. Always install a seal with the
seal lip facing in. Apply force to the outer edge of the
seal and press in evenly.
4. Position the gear case on the engine adapter and
replacethefoursocketheadcapscrewsandwash‐
ers. Inspect and replace washers as necessary.
5. Insert the key, gear (with press) and self locking nut
on the drive shaft.
Note: The impeller shaft/driven gear is nickel-
plated on the surfaces susceptible to corrosion. If
not careful when pressing on the ball bearing, this
nickel plating can chip or peel.
The following are suggested methods of installing
the ball bearing onto the impeller shaft:
1. Coat the inner diameter of the bearing and the
bearingsurfaceoftheshaftwithhighpres‐ sure
grease.Placethebearingonaflat sur‐ faceand
inserttheshaft,squarewiththebear‐ ing, into
the bearing. Press with a light force untilthe
bearingandshafthavealignedprop‐ erly, then
fully press on the bearing to the shoulder on
the shaft.
2. Place the impeller shaft in a freeze
0
r until the
6. Place the needle bearing inner race on the end of the shaft temperature stabilizes at 20 F or less.
drive shaft (tapered end facing out) if it was removed.
7. Slide the splined end of the drive shaft assembly (with
Texaco® 1912 Coupling Grease applied) into the drive
plate. Be sure the pilot diameter on the shaft goes into
the pilot bore in the flywheel.
Remove shaft from freezer, grease bearing
surface of shaft and quickly place bearing
onto shaft. The bearing should slide onto shaft
freely or with a very light force, until bearing
rests against the shaft shoulder. Allow shaft
tositfora few minutes atroom temper‐ ature
before installing in pump.
3. Warm the bearing with even heat,
0
i.e. hot
plate, to a temperature of 250-300 F (hot to
8. Install the mechanical seal stationary ring and oil seal
and wear ring in the gear case cover. Install stationary
ring with chamfered edge facing gear case, being
careful not to scratch the sealing surface.
Clean stationary ring sealing surface with a soft
cloth and denatured alcohol.
9. Reassemble impeller shaft assembly if required.
the touch). With the shaft surface greased,
quickly place the bearing (handle with gloves
or oven mitt) onto the shaft until it rests
against the shaft shoulder. Allow bearing to
cool until it can be handled without gloves.
Note:DONOTuseanopenflameormi‐
crowave to heat bearing.

Page 14 of 14
10. Insert the impeller shaft assembly in the gear case
cover.Be sure the innerrace is onthe shaft end,ta‐
pered end facing out.
11. Using a new gasket, place the gear case cover on the
gear case and replace the ten hex head screws and
lock washers.
Note: It is very important to keep the mechanical
seal sealing surfaces clean and scratch free. Any
dirt, oil, or scoring can cause immediate failure or
premature wear.
E501 Pumps Only (Steps 12-16): (See Figure 11)
Note:Thebellowsassembly fitstight on theim‐
peller hub. This tight fit is necessary for the seal to
withstand the high pressures this pump creates.
Use plenty of mechanical seal lubricant and
push bellows assembly onto impeller hub using
a slight twisting motion to ease installation.
Note: If Waterous Mechanical Seal Lubricant part
no. 52608 is not available, P80 rubber lubricant,
straight dish soap or glycerin may be substituted.
12. Install the impeller gasket.
13. Coattheimpellerhubandinsidediameterof thebel‐
lows assembly with mechanical seal lubricant. Install
bellows assembly onto impeller hub with the primary
ringfacingawayfromtheimpeller.Makesurethepri‐
mary ring stays in its retainer (use a small amount of
grease on the backside of the primary ring as needed
to keep the ring in place).
14. Clean the sealing surface of mechanical seal primary
ring with soft cloth and denatured alcohol.
15. Place key in shaft keyway and install the impeller onto
the shaft.
INSPECTION
E511 Pumps Only (Steps 17-20): (See Figure 12)
Note: If Waterous Mechanical Seal Lubricant part
no. 52608 is not available, P80 rubber lubricant,
straight dish soap or glycerin may be substituted.
16. Coattheimpellershaftandinsidediameterof thebel‐
lows assembly with mechanical seal lubricant. Make
sure the primary ring stays in its retainer (use a small
amount of grease on the backside of the primary ring
asneeded tokeepthe ringinplace). Cleantheseal‐
ing surface of mechanical seal primary ring with soft
clothanddenaturedalcohol.Installthebellowsas‐
sembly, seal spring and spring collar onto the impeller
shaft with primary ring facing the stationary ring. Push
assemblyevenly,usingcollaruntilprimaryringcon‐
tacts the stationary ring.
17. Installnewretainingring.Donotreusetheoldretain‐
ing ring.
Note: Retaining ring material may be different
from original.
18. Install the impeller key in shaft keyway and install the
impeller onto the shaft.
19. Install the Nord-Lock® washer(seeDetailAonFig‐
ure 11) and nut. Torque nut to 70 ft-lbs. maximum.
20. Press new wear ring into the volute carefully so that it
seats squarely in the bottom of the bore.
21. Place the volute over the lubricated O-ring of the gear
case cover and replace the fasteners to secure.
22. Complete reassembly of the pump and any fittings
previously removed.
Testing
1. Before testing the pump, rotate the engine crankshaft
as outlined in the “Preparation Before Operation” sec‐
tion. Be sure there are no abnormal rubbing noises.
2. The mechanical seal may leak when the pump is first
run after it has been repaired. This leakage should
stop after the seal faces run-in.
3. With the pump running, check for unusual noises or
leaks at volute joints, pump adapter/gear case engine
screws, or gear case / engine adapter interface.
Theseshouldbe correctedbeforethepumpisre‐
turned to service.

WATEROUS COMPANY 125 HARDMAN AVENUE SOUTH
SOUTH ST. PAUL, MINNESOTA 55075-2456 U.S.A.
Phone: [phone] FAX: [phone]
Web Site: www.waterousco.com