Carver Pump G2C Manual

G2C
Cantilevered Sump Pump
INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
This manual shall always be kept close to the unit’s location of operation or directly on the pump set.
Part Number: _______________________________________
Serial Numbers: _____________________________________
These operating instructions contain fundamental information and precautionary notes. Please read the manual
thoroughly prior to installation of unit, electrical connection and commissioning. It is imperative to comply with all other
operating instructions referring to components of individual units.
I-461
461-15.02.EN
ATEX REV.0
Inch Units

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G2C I-461
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SERVICE RECORD PAGE
Service No. ______________________Model _________________________ Size and Type _______________
Customer Order No. ____________________________Date Installed __________________________________
Installation Date
Location
Application
PUMP RATING
Capacity _____________________________________ Total Head ____________________________________
Suction Pressure ______________________________ Speed (RPM) __________________________________
Liquid pumped ________________________________ Temperature ___________________________________
Specific Gravity _______________________________ Viscosity ______________________________________
Service ______________________________________
PUMP MATERIALS
Casing _________________________ Impeller _______________________ Shaft _______________________
Gaskets _____________________________________ Bearing Frame _________________________________
Mechanical Seal/Packing ________________________
MOTOR DATA
Motor __________________________ Make _________________________ Serial No. ___________________
Type ___________________________ Frame ________________________ AC or DC ___________________
HP _____________________________ RPM _________________________ Volts _______________________
Phase __________________________ Cycles ________________________

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NOTES ON INSPECTION AND REPAIRS
INSPECTION DATE
REPAIR TIME
REPAIRS
COST
REMARKS

G2C I-461
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INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
TABLE OF CONTENTS
SECTION/PARAGRAPH PAGE
I. GENERAL DESCRIPTION AND SAFETY
PRECAUTIONS................................................1
A. General Information ...................................1
B. Disclaimer ..................................................1
C. Personnel Qualification and Training.........1
D. Pump Identification.....................................1
E. Parts Inventory Guide ................................2
F. Parts Ordering............................................2
G. Safety Precautions.....................................2
II. INSPECTION AND STORAGE ........................3
A. Inspection...................................................3
B. Storage of Pump........................................3
III. INSTALLATION................................................3
A. Location......................................................3
B. Handling.....................................................4
C. Coupling Alignment....................................4
D. Pre-Installation Procedures........................4
E. Piping .........................................................4
F. Auxiliary Piping Connection
and Gauges................................................4
G. Motor..........................................................5
H. Direction of Rotation...................................5
IV. OPERATION.....................................................5
A. Pre-Start Cautions......................................5
B. Priming.......................................................5
C. Starting the Pump ......................................5
D. Operating Checks ......................................5
E. Stopping the Pump.....................................6
F. Indefinite Shutdown....................................6
V. TROUBLESHOOTING OPERATING
PROBLEMS..................................................6
VI. MAINTENANCE ...............................................7
A. Lubrication of Pump Bearings
and Throttle Bushing..................................8
B. Lubrication of Motor ...................................8
C. Torque Values............................................8
SECTION/PARAGRAPH PAGE
VII. SERVICE AND REPAIR................................... 9
A. Preparations for Disassembly of Pump ..... 9
B. Disassembly of Pump................................ 10
C. Parts Inspection......................................... 12
D. Reassembly of Pump................................. 13
E. Adjusting Impeller Clearance on Pump ..... 15
F. Replacement of Optional Wear Ring on
Pump Equipped with Enclosed Impeller.... 16
G. Motor.......................................................... 16
H. Coupling..................................................... 16
I. Check Valve............................................... 16
VIII. PARTS LISTS AND DRAWINGS..................... 17
LIST OF TABLES
NUMBER TITLE PAGE
1. Pumping Unit Troubleshooting .................. 6
2. Recommended Torque Values (ft-lbs)....... 9
3. Recommended Equipment ........................ 9
4. Throttle Bushing Dimensions..................... 12
5. Enclosed Impeller Clearances................... 13
6. Impeller/Wear Ring Matching Materials..... 16
7. Pump Parts List.......................................... 17
8. Recommended Spare Parts List................ 17
LIST OF ILLUSTRATIONS
NUMBER TITLE PAGE
1. Sling Position for Moving Pumping
Unit with Discharge Pipe............................ 4
2. Sling Position for Moving Pumping
Unit without Motor...................................... 4
3. Sling Position for Moving Pumping Unit..... 4
4. G2C (1521 Frame) Sectional Drawing....... 20
5. G2C (1532 Frame) Sectional Drawing....... 21
6. Optional Wear Rings.................................. 22
7. Optional Sleeve.......................................... 22

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G2C I-461
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1
I. GENERAL DESCRIPTION AND
SAFETY PRECAUTIONS.
A. GENERAL INFORMATION. G2C Pumps are
general vertical cantilevered pumps. Carver Pump
Company products are carefully engineered and
manufactured and, if properly installed, maintained, and
operated, should provide maintenance-free operation
and a long service life.
CAUTION
These instructions must always be kept close
to the product's operating location or directly
with the product.
This manual is designed to provide sufficient material to
properly maintain the total pumping unit. The information
presented should improve your knowledge and
understanding of the G2C Pump, thus upgrading the
reliability, service life, and quality of pump maintenance.
These operating instructions do not take into account
local regulations; the operator must ensure that such
regulations are strictly observed by all, including the
personnel called in for installation. Compliance with
such laws relating to the proper installation and safe
operation of the pumping equipment is the responsibility
of the equipment owner and all necessary steps should
be taken by the owner to assure compliance with such
laws before operating the equipment. These instructions
are intended to facilitate familiarization with the product
and its permitted use to help satisfy safety requirements.
Always coordinate repair activity with operations
personnel, and follow all plant safety requirements and
applicable safety and health laws/regulations.
Refer to Figures 4 and 5, the sectional assemblies for
the location of parts identified by item numbers.
Variations do exist between configurations, not all parts
described in the text may be on your configuration.
CAUTION
These instructions should be read prior to
installing, operating, using and maintaining the
equipment in any region worldwide and in
conjunction with the main user instructions
provided. The equipment must not be put into
service until all the conditions relating to safety
instructions have been met.
B. DISCLAIMER. Information in these User
Instructions is believed to be reliable. In spite of all the
efforts of Carver Pump Company to provide sound and
all necessary information the content of this manual may
appear insufficient and is not guaranteed by Carver
Pump Company as to its completeness or accuracy.
C. PERSONNEL QUALIFICATION AND TRAINING.
All personnel involved in the operation, installation,
inspection and maintenance of the unit must be qualified
to carry out the work involved. If the personnel in
question do not already possess the necessary
knowledge and skill, appropriate training and instruction
must be provided. If required the operator may
commission the manufacturer/supplier to provide
applicable training.
Follow instructions in this manual carefully. Factory
warranty applies only when pump operates under
conditions as specified on order acknowledgment, and if
pump is properly installed and maintained as
recommended herein. A copy of this manual should be
available to operating personnel. Additional copies of
this manual are available upon request from Carver
Pump Company and your local distributor. For
comments and/or questions about information provided,
please contact Carver Pump Company or your local
distributor.
D. PUMP IDENTIFICATION. The type of pump, pump
size, operating data, and serial number are all stamped
on the nameplate attached to the pump. Pump
specifications should be recorded upon receipt of the
pumping unit. Record all necessary information on the
pump service record page and inspection and repair
record provided at the front of this manual. This
information must be included in all correspondence
regarding the unit. This will ensure that the correct pump
and/or parts are ordered in a timely manner.

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2
E. PARTS INVENTORY GUIDE. To avoid
unnecessary delays for maintenance, spare parts
should be readily available, purchase before and keep in
stock, for normal service. Most conditions will be
covered if this manual is followed. For every one to
three pumps, stock one spare set consisting of items
listed in Table 5, Recommended Spare Parts. Part
numbers correspond to Figures 4 and 5.
F. PARTS ORDERING. When ordering replacement
parts, please specify:
Serial number of pump (located on nameplate)
Part name (located on parts list)
Quantity of parts needed
Carver Pump Company may ship an interchangeable
part that is not identical in appearance or symbol. This is
done only if the part has been improved. Examine parts
carefully upon delivery before questioning factory or
company representative. Never return parts to the
factory without authorization from Carver Pump
Company.
If an impeller is ordered, specify diameter across blade
tips. Be sure diameter was NOT trimmed further than
diameter shown on Carver Pump Company records.
If a driver or driver parts are ordered, specify name of
manufacturer and all other data found on the driver
nameplate.
G. SAFETY PRECAUTIONS. The manual is designed
to provide adequate instructions for the safe and
efficient installation, operation, or maintenance of the
pump. Failure or neglect to properly install, operate, or
maintain the pump may result in personal injury,
property damage, or unnecessary damage to the pump.
This manual must be read and understood both by the
installing personnel and the responsible trained
personnel/operators prior to installation and operation,
and it must always be kept close to the location of the
pumping unit for easy access.
G.1 Summary of Safety Marking.
The safety instructions contained in this manual whose
non-observance might cause hazards to persons are
specially marked with the symbol:
General hazard sign to ISO 7000 - 0434.
Notes highlight an operating or maintenance procedure,
condition, or statement which is essential, but is not of
known hazardous nature as indicated by DANGERS,
WARNINGS and CAUTIONS.
The word "CAUTION" is used to introduce safety
instructions whose non-observance may lead to damage
to the machine and its functions.
The word "WARNING" is used to introduce safety
instructions whose non-observance may lead to a
potential hazard exists, capable of producing injury to
personnel, if approved procedures are not followed.
The word “DANGER” indicates a location, equipment, or
system where imminent hazards exist, capable of
producing immediate injury or death to personnel, if
approved procedures are not followed.
Instructions attached directly to the machine, e.g.
Arrow indicating the direction of rotation
Markings for fluid connections must always be
complied with and be kept in a perfectly legible
condition at all times.
Observe all note, caution or danger tags attached to the
equipment or included in this manual.
G.2 Non-compliance with Safety Instructions.
Non-compliance with safety instructions may result in
personal injury, property damage, or unnecessary
damage to the pumping unit. Non-compliance with these
safety instructions will also lead to forfeiture of any and
all rights to claims for damages. Non-compliance, can
for example, result in:
Failure of important pumping unit functions.
Failure of prescribed maintenance and servicing
practices.
Hazard to personnel by electrical, mechanical,
and chemical effects as well as explosion.
Hazard to the environment due to leakage of
hazardous substances.
G.3 Safety Instructions for Maintenance, Inspection,
and installation Work.
The operator is responsible for ensuring that all
maintenance, inspection and installation work be
performed by authorized, qualified personnel who are
thoroughly familiar with the manual and pumping unit.
The pumping unit must have cooled down to ambient
temperature, pump pressure must have been released
and the pump must have been drained before working
on any pumping unit.

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3
Work on the pumping unit must be carried out during
shutdown. The shutdown procedure described in the
manual for taking the unit out of service must be
adhered to.
Pumps handling fluids that are hazardous to personnel
must be decontaminated prior to being worked on.
Immediately following completion of the work, all safety
relevant and protective devices must be reinstalled
and/or reactivated.
Please observe all instructions set out in the section on
start-up before returning the pumping unit to service.
G.4 Unauthorized Modification and Manufacture of
Spare Parts.
Modifications or alterations of the pumping unit supplied
are only permitted after consultation with Carver Pump
and to the extent permitted by Carver Pump. Original
spare parts and accessories authorized by Carver Pump
ensure safety. The use of other parts can invalidate any
liability of Carver Pump for consequential damage
and/or warranty.
G.5 Unauthorized Modes of Operation.
The warranty relating to the operating reliability and
safety of the unit supplied is only valid if the pumping
unit is used in accordance with its designated use as
described in the following sections. The limits stated on
the nameplate must not be exceeded under any
circumstances.
II. INSPECTION AND STORAGE.
A. INSPECTION. Upon receipt of the shipment,
unpack and inspect the pumping unit and individual
parts to insure none are missing or damaged. Carefully
inspect all boxes and packing material for loose parts
before discarding them. Immediately report any missing
parts or damage incurred during shipment to the factory
and to the Transportation Company and file your
“damage and/or lost in shipment” claim with the carrier.
B. STORAGE OF PUMP. If the equipment is not to be
immediately installed and operated, store it in a clean,
dry, well-ventilated place, free from vibrations, moisture
and rapid or wide variations in temperature.
NOTE
Storage requirements vary depending on
climatic environment, length of storage and
equipment. For storage periods of three months
or longer, contact manufacturer for specific
instructions. Improper storage could damage
equipment and would result in non-warranty
covered restoration of non-warranty covered
product failures.
When storing the pump up to three months rotate the
shaft for several revolutions at least once per month to
coat the bearings with lubricant, retard oxidation and
corrosion, and prevent possible false brinelling.
The motor bearings should be prepared for storage
according to the motor manufacturer’s instructions, in
the motor manufacturer’s maintenance manual, which
should come with the motor.
The pump ball bearings are packed with grease which
acts as a rust preventative.
Consider a unit to be in storage when:
1. It has been delivered to the job site and is
waiting to be installed.
2. It has been installed but operation is delayed
pending completion of construction.
3. There are long (30 days or more) periods
between operating cycles.
4. The plant (or department) is shut down for
periods of longer than 30 days.
Measures to be taken for prolonged shutdown of
installed pumping unit. If the pumping unit remains
installed a periodic check of operation is in order to
make sure that the pump is always ready for instant
start-up and to prevent the formation of deposits within
the pump and the pump intake area. Start up the
pumping unit regularly once a month or once every 3
months for a short time (approximately 5 minutes)
during prolonged shutdown periods. Prior to operation
check run ensure that there is sufficient liquid available
for operating the pump.
III. INSTALLATION.
A. LOCATION. The pump assembly should be
located in an area that will permit periodic inspection
and maintenance. Head room and access should be
provided and all units should be installed in a dry
location with adequate drainage. The discharge piping
should be direct with as few elbows and fittings as
possible.

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B. HANDLING.
CAUTION
Use a hoist with adequate lifting capacity.
Do not pick up the complete unit by the motor
or the pump shafts or motor lifting eyes.
If the pumping unit slips out of the sling
arrangement, it may cause injury to personnel
and/or damage to the pumping unit.
Moving the unit requires proper preparation and
handling. Always make sure that the pump cannot slip
out of the transport suspension arrangement. To move
the pumping unit with the discharge pipe attach a lifting
eye to the discharge flange, wrap a strap thought the
bearing frame and attach hoisting chain to them (Figure
1). To move the pumping unit without the motor, install
two lifting eyes in the bolt holes on the bearing frame.
Attach the hoisting chain to the lifting eyes. (Figure 2) To
move the pumping unit without the discharge pipe wrap
straps around the motor or through the bearing frame to
attach the hoisting chain to (Figure 3). The individual
motor may be lifted using proper eyebolts provided by
the manufacturer, but these should not be used to lift the
assembled unit.
Figure 1. Sling Position for Moving Pumping Unit
with Discharge Pipe
Figure 2. Sling Position for
Moving Pumping Unit without Motor
Figure 3. Sling Position for Moving Pumping Unit
C. COUPLING ALIGNMENT. The pump and motor
are connected by a coupling. The base and motor
bracket aligns the pump and motor. No further alignment
is necessary.

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D. PRE-INSTALLATION PROCEDURES.
1. Check the pump foundation and confirm the
bolting surface is flat and the bolt pattern is
correct.
2. Place gasket on pump foundation and slowly
lower pump onto the foundation.
3. With the pump in a vertical position resting on
the pump foundation, rotate the pump by hand
utilizing the coupling. Check for any mechanical
hesitation, binding or any acoustically
transmitted signals from the pump. Hand
rotation should be smooth and silent if it is not
disassemble the pump until the source of the
binding is located. Eliminate the binding and
reassemble. Install the pump to foundation
bolting and tighten to the system torque values.
The pump should be rotated frequently during
the procedure to tighten down the pumping unit.
4. After the pumping unit has been completely
tightened down to the foundation, confirm that
there is no binding.
5. Connect the piping.
E. PIPING. All piping should be independently
supported near the pump so that pipe strain will not be
transmitted to the pumping unit.
CAUTION
All piping connections must be made with the
pipe in a freely supported state. Do not apply
vertical or side pressure to align the piping with
the pump flange.
Before connecting suction, discharge, and auxiliary
piping, check to see that the piping is absolutely clean
internally. Any debris in the piping will be drawn into the
pump passageways and can cause extreme damage.
The internal diameters of the suction and discharge
lines must be equal to the internal diameters of the
pump suction and discharge nozzles.
F. AUXILIARY PIPING CONNECTIONS AND
GAUGES. In addition to primary piping connections, the
pump may require other connections such as gauges or
drains. All these lines and gauges should now be
installed.
G. MOTOR. See motor vendor’s manual for motor
information and information on connecting to the power
supply.
CAUTION
Connection to the power supply must be
effected by a trained electrician only. Check
available main voltage against the data on the
motor rating plate and select appropriate start-
up method.
H. DIRECTION OF ROTATION. Correct pump rotation
is indicated by an arrow on the frame adaptor. The
standard direction of rotation, viewed from the motor
end, is clockwise. The direction of rotation must agree
with the arrow stamped on the pump frame or base.
IV. OPERATION.
A. PRE-START CAUTIONS.
DANGER
Before activating the pumping unit, check to
make sure there are no personnel working on
the unit. Serious injury or death to personnel
could result if the unit is activated while being
worked on.
1. Before starting or operating the pump, read this
entire manual, especially the following
instructions.
2. Observe all caution or danger tags attached to
the equipment.
CAUTION
Never run the pump dry. Close running fits
within the pump are liquid lubricated. Dry
running will result in pump seizure or damage.
3. Before starting the pump, the pump casing
should be completely submerged in liquid.
4. Check final alignment of pump and driver. Both
shafts must turn freely by hand.
5. If excessive vibration or noise occurs during
operation, shut the pump down and rotate shaft
by hand. If excessive vibration or noise
continues, consult a Carver representative.
6. Before starting the pump, install closed guards
around all exposed rotating parts.
7. Jog starter switch on motor to check that the
direction of rotation must agree with the arrow
stamped on the pump frame or base.

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B. PRIMING. Dry running a centrifugal pump can
result in extensive damage and possible seizing. It is,
therefore, imperative that the pump be primed prior to
initial start-up and that prime must be maintained
through subsequent start-stop cycles.
Follow the procedure listed below:
1. Check the level in the tank to see that the pump
is submerged in liquid.
2. The pump is now primed.
C. STARTING THE PUMP.
CAUTION
Do NOT operate pumping unit against a closed
discharge system. If pump has any chance of
operation against a closed system, a bypass
system allowing a minimum design flow should
be installed. This bypass will be satisfactory for
short periods of operation. For extended
periods of operation the bypass should be
sized for the minimum continuous flow required
by the pump.
1. Check pump for proper priming and lubrication.
2. Open discharge valves slightly, about 1 to 1 ½
turns if pump is being started for the first time or
from being turned off for overhaul. Start the
pump.
3. Slowly open discharge valves and adjust
pressure and flow to the appropriate operating
conditions. Refer to pump nameplate and
system operating procedures for design point
condition.
D. OPERATING CHECKS.
1. Check for undue vibration or noise. If any
occurs and does not stop within a short period
of time, turn off the pump. For determination of
the cause and its remedy refer to
troubleshooting in Section V or consult Carver
Pump Company.
2. Check and record flow and pressure readings.
The flow and pressure readings should be
within the operating system guidelines and
similar to number stamped on the pump
nameplate.
3. Check and record vibration.
4. Check and record power input to the motor.
E. STOPPING THE PUMP.
1. If the pump is being stopped for overhaul, slowly
close the discharge valve. Otherwise leave
discharge valves set at condition.
2. Stop the pumping unit in accordance with the
directions on the electrical power supply.
3. Tagout and lockout power to motor according to
OSHA Standard 1910.147.
4. Close any auxiliary fluid lines.
5. The pumping unit is now off.
F. INDEFINITE SHUTDOWN. Relubricate bearings.
Provide pump assembly with a protective cover.
Remove casing plug to drain casing. Drain all piping if
there is a possibility of liquid freezing.
V. TROUBLESHOOTING OPERATING
PROBLEMS.
If you have followed the installation and starting
procedures outlined in this manual, the pump should
provide reliable service and long life. However, if
operating problems do occur; significant time and
expense can be saved if you refer to Table 1 to
eliminate the most common causes of those problems.
For the motor troubleshooting refer to the motor manual.
Table 1. Pumping Unit Troubleshooting
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
Failure to deliver
liquid.
1. Discharge head above shutoff.
2. Check valve stuck or improperly installed.
3. Impeller or suction clogged.
1. Check pump rating against actual head
condition.
2. Adjust and/or reverse valve.
3. Inspect strainer and impeller. Clean as
necessary.

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Table 1. Pumping Unit Troubleshooting (Continued)
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
Excessive
power
consumption.
1. Head lower than rating: trying to pump too
much liquid or operating at end of
performance curve.
2. Specific gravity or viscosity of oil is too
high.
3. Mechanical defects such as binding rotating
elements.
4. System head lower than design condition.
5. Incorrect impeller diameters.
1. Adjust pressure flow.
2. Check oil temperature and adjust as
necessary.
3. Check for excessive pipe strain. Check
foundation bolting. Replace defective parts.
4. Adjust system head. Trim impellers to
actual condition.
5. Replace impellers or trim impellers to
correct diameter. Consult with Carver
Pump before trimming impellers.
Insufficient
discharge or
flow.
1. Discharge head above shutoff.
2. Air or gases in oil.
3. Impeller or suction partially clogged.
4. Wrong direction of rotation.
5. Specific gravity or viscosity of oil is too
high.
6. Incorrect impeller diameter.
1. Check pump rating against actual head
condition.
2. Adjust and/or redesign suction system. Add
oil to system.
3. Inspect strainer and impeller and clean as
necessary.
4. Reverse direction of rotation.
5. Check oil temperature and adjust as
necessary.
6. Replace impeller or trim impeller to correct
diameter. Consult with Carver Pump before
trimming impeller.
Vibration
excessive.
1. Foundation bolting loose.
2. Coupling halves not properly oriented
relative to each other.
3. Impeller partially clogged.
4. Wrong rotation.
5. Insufficient foundation.
6. Pipe strain.
7. Bent shaft.
8. Coupling key to motor or coupling key to
pump is not correct length.
9. Rotating equipment imbalance.
10. Motor improperly balanced.
1. Torque bolting to proper values.
2. Adjust coupling halves system relative to
match marks.
3. Inspect impeller and clean as necessary.
4. Adjust direction of rotation.
5. Stiffen foundation as necessary.
6. Modify piping as necessary.
7. Replace shaft.
8. Replace with key of correct length.
9. Replace shaft or balance impeller.
10. Balance motor.
Bearing
temperature
excessive.
1. Lubrication, insufficient lubrication.
2. Defective bearing.
3. Excessive or no load on bearing.
1. Lubricate according to Section VI,
Paragraphs A and B.
2. Replace bearing.
3. Running to close to shutoff or outside of
recommended operating condition.

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VI. MAINTENANCE.
Generally the pump does not need continuous
supervision. The pump should always run quietly and
smoothly, without vibration. To ensure such operation,
the following maintenance schedule should be applied
at regular intervals during operation of the pump.
Occasional visual checks are recommended. Data
should be recorded for each pump to keep track of
maintenance which has been performed and to note
operational problems. A sample maintenance record
sheet is provided for this purpose at the front of this
manual. For motor maintenance refer to the motor
manual for the unit.
Daily Inspection:
Visually inspect unit.
Check bearing temperatures.
Weekly Inspection:
Check power (amps) readings.
Check pump discharge pressure. Prescribed
operating discharge pressure should never drop
below 90 percent of design point pressure.
Check vibration on pump and driver bearings.
Vibration should NOT exceed 1.5 overall
displacement (unfiltered) peak to peak mils
(0.001”) at 3600 RPM and 3.0 overall
displacement (unfiltered) peak to peak mils
(0.001”) at 1750 RPM.
Monthly Inspection:
Check coupling alignment.
If necessary, grease coupling. Do NOT over
grease.
Check foundation bolts.
Semi-annual Inspection:
Check coupling alignment due to settling of
foundation.
If stand-by pumps are installed, it is advisable to
operate pumps on a rotation system to give each
pump a certain duty. This ensures that stand-by
pumps will always be in good condition for instant
start-up.
25000 Hours - Overhaul
For pump overhaul, disassemble pump, complete
parts inspection, and reassemble pump according
to Section VII.
Inspect suction cover for corrosion, erosion or
other damage. 3mm limit of metal loss in casing.
A. LUBRICATION OF PUMP BALL BEARINGS AND
THROTTLE BUSHING.
Ball Bearings (16 and 18). The pump ball bearings are
grease lubricated.
Grease, lubrication frequency depends on operating
conditions. Normal duty calls for lubrication after 1,000
hours and every 10,000 hours afterwards. Ball bearings
are lubricated at Carver Pump Company with Amoco
Rykon Premium Grease No. 2EP or equivalent, non-
soap, polyurea thickened grease with a drop point of
450 degrees F. This grease was selected because of its
suitability for extreme pressures and its high
temperature stability. Never mix greases with differing
properties.
Polyurea based greases are NOT compatible with
lithium or soda soap based greases. Therefore, the type
of grease added should not vary. However, if it is
necessary to change grease types, the bearing cap
should be thoroughly cleaned and flushed with suitable
solvent to remove all traces of old grease. Disassemble
pump according to Section VII, Paragraph B, remove
shaft and ball bearings from bearing frame and follow
these procedures:
NOTE
It is recommended that when ball bearings (16
and 18) are removed from the shaft (6), the ball
bearings be replaced. If ball bearings are in
good condition and must be reused, follow the
procedures below.
1. Place ball bearings, bearing frame, and bearing
cap/cartridge in a wire or mesh basket and
suspend the basket in a light mineral solvent.
Allow it to soak, preferably overnight.
2. After soaking and cleaning the ball bearings,
bearing frame, and bearing cap/cartridge should
be rinsed in a clean, light mineral solvent and
agitated vigorously to remove all loosened hard
grease and dirt.
3. Dip ball bearings in clean, light oil and spin by
hand to determine that all foreign matter has
been removed.
4. After cleaning, repack ball bearings half full on
both sides with a good quality bearing grease.
5. Proceed with reassembly of pump according to
Section VII, Paragraph D.
To lubricate the ball bearings use the following
procedure:

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
9
CAUTION
Over greasing creates heat and is the cause of
many problems requiring repair. DO NOT
OVER GREASE.
1. Never lubricate ball bearings while unit is
running. If necessary, shut down pumping unit
according to Section IV, Paragraph E.
2. Remove plugs opposite grease fitting on both
ends of bearing cap.
CAUTION
Do not lubricate bearing with a power grease
gun.
3. Using a hand-operated grease gun on grease
fittings, add approximately one ounce of fresh
grease. With most hand-operated grease guns,
two or three pumps are enough. DO NOT
OVER GREASE. When installing new bearing,
pack new bearing only half full with grease.
Bearing temperature may rise above normal
immediately after lubrication, but should
stabilize within 4 to 8 hours.
Throttle Bushing (63). The throttle bushing (63) is self-
lubricating.
B. LUBRICATION OF MOTOR. See motor
manufacturer’s instructions to be sure motor bearings
are properly lubricated.
C. TORQUE VALUES. Refer to Table 2,
Recommended Torque Values. Clean and properly
lubricate threads and bearing face of the fastener to
obtain the proper fastener loading from these torque
values. Fasteners should be tightened evenly and in
stages. Refer to your torque wrench manual for the
proper use of your wrench.
Table 2. Recommended Torque Values (ft-lbs)
Bolt Size
Material
Composite
Steel (or
otherwise noted)
316 Stainless
Steel
¼”-20
5
5
7
5/16”-18
11
11
12
3/8”-16
18
18
21
½”-13
33
39
45
5/8”-11
54
83
97
¾”-10
80
105
132
7/8”-9
109
160
203
1”-8
144
236
300
Table 3. Recommended Equipment
Tools
Materials
Test Equipment
Spanner Wrench
Rawhide or
O-ring Lubricant
Coupling Alignment
Gauges
Wood Mallet
Volt-Amp Meter
Wooden Wedge
Allen Wrench Set
Socket, Open, &
Box Wrench
Set
Vice Grips
Torque Wrench
Bearing Heater

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
10
VII. SERVICE AND REPAIR.
Refer to Figures 2 or 3 to locate the pump parts by item
number and parts list. For motor service and repair refer
to the motor manual for the unit.
A. PREPARATIONS FOR DISASSEMBLY OF PUMP.
During disassembly, match mark parts so they can be
replaced in their original position. All parts should be
thoroughly cleaned or replaced with new, if necessary.
Sealing faces should be perfectly clean. Carver Pump
Company recommends that all O-rings and shims are
only used once.
CAUTION
Factory authorized parts must be used to safely
maintain your Carver Pump.
NOTE
To avoid damage to O-rings, check to make
sure all parts are free of sharp edges or burrs.
Close discharge valves. The pump volute should be
cooled down to ambient temperature. The volute must
be empty and not under pressure.
After prolonged operation, components may not be
easily removed from shaft. In such instances, rust
solvent may be used and suitable extracting tools
applied wherever possible. Do NOT use force under any
circumstances. Refer to Table 3, Recommended
Equipment, for proper tooling during disassembly and
assembly. Refer to appropriate sectional drawing for
location of parts followed by an item number.
Carver Pump Company recommends that the following
parts be replaced with new:
O-rings / gaskets
Shims
Bearings
Grease seals
Prepare the pumping unit for disassembly using the
following list:
1. Read this entire section and study the sectional
view drawing, Figures 4 or 5, before
disassembling the pump.
DANGER
Before attempting to disassemble the pump,
the electrical power supply to the driver must
be locked and tagged in the “OFF” position to
prevent injury or death to personnel servicing
the pumping unit.
2. Stop the pumping unit; refer to Section IV,
Paragraph E.
WARNING
Properly decontaminate pump and piping
before disconnecting the pumping unit.
Applicable hazardous material procedures must
be followed.
3. Slowly close discharge valves.
4. Shut off and close all valves controlling flow of
liquid to and from pump. Disconnect piping and
gauge line as necessary.
5. Allow pump to drain. If necessary, flush pump to
remove corrosive or toxic pumpage.
6. Remove coupling guard. Match mark coupling
halves to assure proper coupling reassembly.
Disconnect coupling between pump and motor.
If non-spacer coupling is fitted, the driver will
have to be removed from the bearing housing.
B. DISASSEMBLY OF PUMP.
G2C, 1521 FRAME (Cantilevered). (Refer to Figure 4
and Table 7) Disassemble the pumping unit using the
following procedure:
1. Complete Section VII, Paragraph A before
continuing with disassembly.
CAUTION
Use a hoist with adequate lifting capacity.
NOTE
Mark or number each component while
dismantling according to sequence.
2. Attach lifting strap to motor lifting eye (Refer to
Figure 1).
3. Remove bolts (603), freeing motor from bearing
housing (19). Hoist motor and motor coupling
half away from pump and rest on plywood,

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
11
heavy cardboard or other adequate durable
surface. If servicing motor or replacing coupling
(42), loosen setscrews to remove coupling half
and motor coupling key from motor shaft.
NOTE
Do not allow pump to sit and dry out before
completing disassembly. Remove as much
sediment from outside of pump as possible
before moving pumping unit.
4. Remove foundation bolts from base (23). Insert
one lifting eye onto each corner of the base bolt
holes. Take to a suitable work area.
5. Remove bolts (600) from backhead (11).
Remove casing (1) with suction cover (9)
assembled, if equipped, from backhead.
NOTE
Impeller bolt (26) has right handed threads.
6. Remove impeller bolt (26) and impeller washer
(28).
7. Remove impeller (2) and impeller key (32).
8. If equipped, remove shaft sleeve (14). Refer to
sectional assembly drawings, optional sleeve
detail.
9. Remove bolt (605) from column (101). Remove
backhead (11) from column with throttle bushing
(63) in backhead.
10. Inspect throttle bushing (63) in accordance with
Section VII, Paragraph C, step 3 and Table 4.
Do NOT remove throttle bushing from backhead
(11) unless the throttle bushing needs replaced.
11. Remove nuts (620) with bolts (602) and
washers (630 and 631).
CAUTION
To lift bearing housing, use a hoist or suitable
lifting device.
12. Remove bearing housing (19) assembly and
shaft (6).
13. Remove coupling half on pump side and
remove coupling key (46).
14. Remove slinger (40) from shaft (6).
15. Remove bolt (601) from column (101) and
remove column with vapor seal (47A) from
shaft.
16. Loosen setscrew (667) and remove bearing cap
(37) with grease seal (47) by unscrewing
bearing cap from bearing housing (19).
17. Remove bearings (16 and 18) with shaft (6)
assembly from bearing housing (19) by pulling
shaft assembly from bearing housing through
end housing ball bearing (18).
18. Remove outer snap ring (176).
19. Remove bearings (16 and 18) from shaft (6).
20. Remove bearing spring (449).
G2C, 1532 FRAME (Cantilevered). (Refer to Figure 5
and Table 7) Disassemble the pumping unit using the
following procedure:
1. Complete Section VII, Paragraph A before
continuing with disassembly.
CAUTION
Use a hoist with adequate lifting capacity.
NOTE
Mark or number each component while
dismantling according to sequence.
2. Attach lifting strap to motor lifting eye (Refer to
Figure 1).
3. Remove bolts (603), freeing motor from bearing
housing (19). Hoist motor and motor coupling
half away from pump and rest on plywood,
heavy cardboard or other adequate durable
surface. If servicing motor or replacing coupling
(42), loosen setscrews to remove coupling half
and motor coupling key from motor shaft.
NOTE
Do not allow pump to sit and dry out before
completing disassembly. Remove as much
sediment from outside of pump as possible
before moving pumping unit.
4. Remove foundation bolts from base (23). Insert
one lifting eye onto each corner of the base bolt
holes. Take to a suitable work area.
5. Remove bolts (600) from backhead (11).
Remove casing (1) with suction cover (9)
assembled, if equipped, from backhead.

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
12
NOTE
Impeller bolt (26) has right handed threads.
6. Remove impeller bolt (26) and impeller washer
(28).
7. Remove impeller (2) and impeller key (32).
8. If equipped, remove shaft sleeve (14). Refer to
sectional assembly drawings, optional sleeve
detail.
9. Remove bolt (605) from column (101). Remove
backhead (11) from column with throttle bushing
(63) in backhead.
10. Inspect throttle bushing (63) in accordance with
Section VII, Paragraph C, step 3 and Table 4.
Do NOT remove throttle bushing from backhead
(11) unless the throttle bushing needs replaced.
11. Remove nuts (620) with bolts (602) and
washers (630 and 631).
CAUTION
To lift bearing housing, use a hoist or suitable
lifting device.
12. Remove bearing housing (19) assembly and
shaft (6).
13. Remove coupling half on pump side and
remove coupling key (46).
14. Remove slinger (40) from shaft (6).
15. Remove bolt (601) from column (101) and
remove column with vapor seal (47A) from
shaft.
16. Remove the ball bearings (16 and 18) with shaft
(6) assembly from the bearing housing (19) by
unscrewing the bearing cap (37) from the
bearing housing (19). Remove bearing cap O-
ring (89A).
17. Remove bearing holder snap ring (177) and
remove the bearing cap (37).
18. Remove outer snap ring (176).
19. Remove bearings (16 and 18) from shaft (6).
C. PARTS INSPECTION.
1. All parts should be thoroughly cleaned or
replaced with new ones if necessary. All gasket
faces should be perfectly clean. It is
recommended that all grease seals, gaskets, O-
rings, and locking devices with a nylock feature
be replaced with new if disturbed from position.
2. Inspect casing for pitting, scoring, and erosion.
The inside of the casing should be free of any
pits or grooves. Replace the casing if any of
these defects are present.
3. Inspect throttle bushing (63) for wear. Measure
inside diameter of throttle bushing. The throttle
bushing requires replacement if the inside
diameter is more than 0.020 inch out of round or
.005 inch oversized. Refer to Table 4 for
maximum diameter of throttle bushing.
Table 4. Throttle Bushing Dimensions
Frame Size
Maximum
Diameter
Minimum
Diameter
1521
1.277 inches
1.275 inches
1532
1.777 inches
1.775 inches
4. Inspect impeller and coupling keys for distortion
and push fit into keyways. The keys should be
square on all four edges. They should fit without
having to be forced. The keys should not rock in
keyway. Replace keys or shaft if necessary.
5. Inspect and replace any defective grease
fittings.
6. (Open Impellers) If the impeller (2) shows
excessive wear due to erosion or pitting, so that
performance cannot be restored, it must be
replaced.
7. (Enclosed Impellers, ordering code DA
through EG) Check the impeller (2) and suction
cover (9) wear clearance as follows:
a. Measure outside diameter of front impeller
hub in three places. Refer to Table 5,
Enclosed Impeller Clearance.
b. Measure inside diameter of suction cover or
wear ring, if equipped, in three places.
c. If difference between the high reading of the
inside diameter of the suction cover or wear
ring, if equipped, and the low reading of the
outside diameter of the impeller hub
exceeds double the maximum clearances
given in Table 5, replace the impeller and/or
suction cover according to Section VII,
Paragraph D.
8. (Closed Impellers, ordering code DA through
EG) Check the optional wear ring clearance as
follows:
a. Measure Outside Diameter (OD) of front
impeller hub (2) in three places.

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
13
b. Measure Inside Diameter (ID) of wear ring
(7) in three places.
c. If difference between the high reading of the
ID of the wear ring (7) and the low reading
of the OD of the impeller (2) hub exceeds
double the maximum clearances given in
Table 9, replace the wear ring according to
Section VII, Paragraph F.
d. Measure OD of back impeller hub (2) in
three places.
e. Measure ID of wear ring (7X) in three
places.
f. If difference between the high reading of the
ID of the wear ring (7X) and the low reading
of the OD of the impeller (2) hub exceeds
double the maximum clearances given in
Table 9, replace the wear ring according to
Section VII, Paragraph F.
9. Inspect ball bearings (16 and/or 18) for damage.
A damaged bearing must be replaced. If
bearings are removed from shaft, it is
recommended that the bearings be replaced. If
bearing replacement is not possible and bearing
is in good condition bearing should be cleaned
according to Section V, Paragraph B, steps 1-3.
Protect until ready to use.
Table 5. Enclosed Impeller Clearances
Ordering
Code
Impeller Size
Wear Ring Size
Factory Standard
Diametric Clearance
Minimum
Maximum
DA
2.750/2.749 inches
2.762/2.760 inches
.010 in.
.013 in.
DB
4.724/4.722 inches
4.740/4.742 inches
.016 in.
.020 in.
DC
4.724/4.722 inches
4.740/4.742 inches
.016 in.
.020 in.
DD
4.724/4.722 inches
4.740/4.742 inches
.016 in.
.020 in.
DE
7.937/7.935 inches
7.956/7.958 inches
.019 in.
.023 in.
EA
3.337/3.335 inches
3.347/3.349 inches
.010 in.
.014 in.
EB
4.124/4.122 inches
4.140/4.142 inches
.016 in.
.020 in.
EC
4.715/4.713 inches
4.731/4.733 inches
.016 in.
.020 in.
ED
5.500/5.498 inches
5.517/5.518 inches
.017 in.
.020 in.
EE
5.894/5.892 inches
5.912/5.914 inches
.018 in.
.020 in.
EF
6.681/6.679 inches
6.698/6.700 inches
.017 in.
.021 in.
EG
7.862/7.860 inches
7.881/7.882 inches
.019 in.
.022 in.

G2C I-461
Cantilevered Sump Pump 461-15.02.EN
14
D. REASSEMBLY OF PUMP. During reassembly,
install parts as applicable. Assemble the pump in
accordance with accepted rules of engineering practice.
Coat individual components with a suitable lubricant
before assembling. Assembly of unit should be
performed on a clean, flat surface.
G2C, 1521 FRAME (Cantilevered). (Refer to Figure 4
and Table 7) Reassemble the pumping unit using the
following procedure:
CAUTION
During reassembly, install new O-rings, grease
seals, vapor seals, and gaskets if disturbed
from position. O-rings, grease seals, vapor
seals, and gaskets may have been damaged
during disassembly.
During reassembly, Carver recommends that
ball bearings be replaced.
NOTE
All parts should be thoroughly cleaned or
replaced with new ones if necessary. All
sealing faces should be perfectly clean.
1. Complete Section VII, Paragraph C before
continuing with assembly.
2. Install bearing spring (449) onto shaft (6)
between two bearing seats.
3. Install outer snap ring (176) on shaft (6).
4. Install ball bearings (16 and 18) onto shaft (6).
Ball bearings may be pressed onto shaft or
heated so they slide onto shaft. Pack ball
bearings half full of grease. Refer to Section VI,
Paragraph A for proper grease type.
5. Install shaft assembly into bearing housing (19).
6. Install new grease seal (47) in bearing cap and
vapor seal (47A) in column (101).
7. Install bearing cap (37) and hand tighten. Install
setscrew (667) into bearing cap. Do not secure
bearing cap with setscrew until impeller
clearance is adjusted.
8. Install coupling key (46) and slide coupling half
onto pump shaft.
WARNING
To lift bearing housing, use a hoist or suitable
lifting device.
9. Install bearing housing assembly and shaft (6)
onto base (23) and secure with bolts (602),
washers (630 and 631), and nuts (620).
10. Install column (101) onto shaft and secure to
backhead (19) with bolts (601).
11. Install slinger (40) on shaft (6).
12. Install shaft sleeve (14), if equipped. Refer to
Figure 7, optional sleeve detail.
13. If throttle bushing (63) was removed, press new
throttle bushing into backhead (11).
14. Install backhead (11) onto column (101) with
bolts (605).
CAUTION
Use removable thread locker when installing
impeller bolt.
15. Install impeller key (32) and impeller (2) and
secure with washer (28) and bolt (26).
16. Secure casing (1) with bolts (600) to backhead
(11).
17. Adjust impeller in accordance with Section VII,
Paragraph E.
CAUTION
Use a hoist with adequate lifting capacity.
18. (Refer to Section III, Paragraph B) Attach lifting
straps. Hoist pump to installation site, placing
base (23) on foundation.
19. Remove lifting eyes and replace with foundation
bolts as applicable.
CAUTION
Use a hoist with adequate lifting capacity.
20. Hoist motor to installation site. Place motor in
position on bearing frame (19) and secure with
bolts (603).