Carver GH Series User manual

I-120 Revision 01

SERVICE RECORD PAGE
Service No. ________________ Size and Type ______________ Make ________________________
Customer Order No. ________________________ Date Installed __________________________________
Installation Date Location Application
PUMP RATING
Capacity (GPM) __________________________ Total Head (ft) _______________________________
Suction Pressure _________________________ Speed (RPM) ________________________________
Liquid __________________________________ Temperature ________________________________
Specific Gravity __________________________ Viscosity ____________________________________
Impeller Diameter (inches) ______________________________________________________________
PUMP MATERIALS
Casings ___________________ Impeller ___________________ Diffuser _______________________
Shaft ____________________________________ Wear Ring ________________________________
O-rings _______________________________ Bearing Frame _______________________________
Mechanical Seal, Suction End (Low Pressure) ______________________________________________
Mechanical Seal, discharge End (High Pressure) ____________________________________________
DRIVER DATA
Motor _________________ Make ________________________ Serial No. ______________________
Type __________________ Frame _______________________ AC or DC ______________________
HP ____________________ RPM ________________________ Volts _________________________
Phase _________________ Cycles _______________________

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

i
TABLE OF CONTENTS
Section/Paragraph Page
I. GENERAL INFORMATION .............1
A. Preface....................................1
B. Pump Identification ...................1
C. Parts Inventory Guide ...............1
D. Parts Ordering..........................1
E. Safety Precautions....................3
II. INSPECTION AND STORAGE ........3
A. Inspection ................................3
B. Storage....................................4
III. INSTALLATION..............................4
A. Installation Checks....................5
IV. OPERATION..................................8
A. Pre-Start Cautions ....................8
B. Priming ....................................8
C. Starting the Pump.....................8
D. Stopping the Pump ...................9
V. TROUBLESHOOTING ....................9
VI. MAINTENANCE .............................13
A. Field Inspection ........................13
B. Bearing Lubrication...................13
VII. SERVICE AND REPAIR..................14
A. Preparations for Disassembly and
Assembly of Pump....................14
B. Disassembly of Pump ...............14
C. Disassembly of Power Frame on
Frame-Mounted Pumps.............15
D. Parts Inspection........................15
E. Assembly of Pump....................17
F. Replacement of Optional Wear
Ring on Pumps Equipped with
Closed Impellers.......................18
VIII.PARTS LISTS AND SECTIONAL
DRAWINGS ...................................19
LIST OF TABLES
NUMBER TITLE PAGE
A. Recommended Torque Values ........9
1. Troubleshooting..............................10
2. Enclosed Impeller Clearance...........16
3. Impeller and Wear Ring Matching
Materials ........................................18
4. Recommended Spare Parts List ......20
5. Parts List for General Horizontal
(GH) Pumps (Frame-Mounted and
Close-Coupled) ..............................20
LIST OF ILLUSTRATIONS
NUMBER TITLE PAGE
A. Ordering Code................................2
1. Coupling Alignment.........................6
2. Sectional Drawings for Frame-
Mounted GH Pump .........................21
3. Sectional Drawings for Close-Coupled
GH Pump.......................................22

1
I. GENERAL INFORMATION.
A. PREFACE. Our general horizontal (GH) end
suction pumps are designed to handle water
acids and alkaline solutions for general service
and process industry applications. Hydraulic
performance extends to 2,500 gallons per
minute (GPM) and is covered by twenty-eight
sizes. The sizes are available in cast iron,
bronze fitted, 316 stainless steel (SS) fitted, and
all 316 SS construction. All models feature a
back pullout design, removable suction covers,
and casings, which rotate in ninety-degree
increments for different field piping orientations.
Additional standard features include 316 SS
shaft sleeves, keyed impellers, dynamic
balancing to ISO G2.5 guidelines, and bearings,
which are secured with locking rings.
Carver Pump Company products are carefully
engineered and manufactured and, if properly
installed, maintained, and operated, provide long
service life.
Factory warranty applies to pumps operating
under conditions specified on the order
acknowledgement, and are properly installed
and maintained, as recommended herein.
This manual, which is the result of carefully
conducted engineering and research efforts,
provides technical information necessary to
properly disassemble, assemble, maintain, and
operate your pump. To ensure smooth operation
of the pump with minimal maintenance, carefully
read the information provided and follow the
recommended procedures. Additional copies of
this manual are available on our website,
www.carverpump.com, and upon request from
your local Carver Pump Company distributor.
For comments and/or questions regarding the
information contained herein, please contact
Carver Pump Company or your local distributor.
B. PUMP IDENTIFICATION. The type of pump,
pump size, operating data, and serial number
are stamped on the nameplate attached to the
pump. Upon receipt of the pumping unit, record
pump specifications and all other necessary
information on the service record and inspection
and repair record located in the front of this
manual. When ordering spare parts (refer to
Table 4) or requesting information, furnish
nameplate data to Carver Pump Company or its
representative. When ordering a pump, refer to
Figure A, Ordering Code, for assistance. Include
the information from Figure A in all
correspondence regarding the unit. By furnishing
this information, it ensures that the correct pump
and/or parts are ordered in a timely manner.
C. PARTS INVENTORY GUIDE. To avoid
unnecessary delays during maintenance of
pump, spare parts should be readily available for
normal service. For every one to three pumps,
stock one spare parts set consisting of items
listed in Table 4, Recommended Spare Parts.
Part numbers correspond to drawings (figure 2
and figure 3) located in the back of this manual.
D. PARTS ORDERING. Carver Pump
Company strives to provide prompt, accurate
service. To ensure quality service support,
please provide the following information when
ordering parts:
•Serial number of pump (located on
nameplate)
•Part name (refer to Table 5)
•Item number (refer to Table 5 and
figures 2 and 3)
•Quantity of parts needed
Carver may ship an interchangeable part that is
not identical in appearance or symbol. Examine
the parts carefully on receipt before calling the
factory or a company representative. Never
return parts to the factory without authorization
from Carver Pump Company.
If an impeller is ordered, specify diameter across
blade tips. Check to make sure diameter was
NOT trimmed further than diameter shown on
Carver Pump Company records.
If a driver or driver parts are ordered, specify the
name of the manufacturer and all other data
located on the driver nameplate.

2
The following Ordering Code defines the new
GH Series pump and pump/motor and top plate
arrangements. When quoting or ordering a GH
pump, this Ordering Code must be used. This
ordering code enables Carver Pump Company
to accept orders quickly, assuring timely and
correct manufacture of the desired pump.
-
-
-
Pump Series
Motor Mounting, Enclosure and Efficiency
GH
- General Horizontal Series
A
- Foot mounted, ODP, standard (EPACT) efficiency (GHF only)
B
- Foot mounted, TEFC, standard (EPACT) efficiency (GHF only)
C
- Foot mounted, X-P, standard efficiency (GHF only)
Mounting Style
C -
Close coupled
D
- Close coupled, ODP, standard efficiency (GHC only)
F
- Frame mounted
E
- Close coupled, TEFC, standard efficiency (GHC only)
F
- Close coupled, X-P, standard efficiency (GHC only)
X
- Special
Z
- No motor or customer supplied motor (GHF only)
Casing Nozzle and Impeller Sizes
AA
- 1 1/4 x 1 x 5
AB
- 2 x 1 1/2 x 5
Motor Speed, Voltage and Frequency
AC
- 2 1/2 x 2 x 5
A
- 1150 RPM, 230/460 Volt, 60 Hz
B
- 1750 RPM, 230/460 Volt, 60 Hz
BA
- 1 1/4 x 1 x 7
C
- 3500 RPM, 230/460 Volt, 60 Hz
BB
- 1 1/2 x 1 1/4 x 7
BC
- 2 1/2 x 2 x 7
X
- Special
BD
- 3 x 2 1/2 x 7
Z
- No motor (GHF only)
BE
- 4 x 3 x 7
BF
- 5 x 4 x 7
Motor Power Rating
CA
- 1 1/2 x 1 1/4 x 10
A
- 1.5 HP
H
- 20 HP
R
- 100 HP
CB
- 2 x 1 1/2 x 10
B
- 2.0 HP
J
- 25 HP
S
- 125 HP
CC
- 2 1/2 x 2 x 10
C
- 3.0 HP
K
- 30 HP
CD
- 3 x 2 1/2 x 10
D -
5.0HP
M
- 40 HP
X
- Special
CE
- 4 x 3 x 10
E
- 7.5 HP
N
- 50 HP
CF
- 5 x 4 x 10
F
- 10 HP
P
- 60 HP
Z
- No motor (GHF only)
CG
- 6 x 5 x 10
G
-15HP
Q
- 75 HP
DA
- 2 x 1 x 11
DB
- 4 x 2 x 11
DC
- 4 x 3 x 11
DD
- 5 x 4 x 11
Baseplate and Coupling
DE
- 8 x 6 x 11
A
- Standard steel baseplate w/ standard coupling and guard
B
- Standard steel baseplate w/ spacer-type coupling and guard
EA
- 2 1/2 x 1 1/2 x 13
X
- Special
EB
- 2 1/2 x 2 x 13
Z
- No baseplate, coupling or coupling guard (
standard w/ GHC
)
EC
- 3 x 2 1/2 x 13
ED
- 4 x 3 x 13
EE
- 5 x 4 x 13
Seal Flush Arrangements
EF
- 6 x 5 x 13
A -
Plan 11 seal flush
EG
- 8 x 6 x 13 (GHF only)
X
- Special
Z
- No seal flush (
standard
)
Basic Materials of Construction
A -
All cast iron construction
Sealing Arrangements (Type 1 as standard)
B -
Bronze fitted cast iron construction
A
- Carbon on ceramic faces, no seal flush (
standard
)
C -
316 SS fitted cast iron construction
B
- Carbon on silicon carbide faces, no seal flush
D -
All 316 SS construction
X
- Special
GH
G B C
F
A A B
BD C
NOTE: Casing Nozzle and Impeller Sizes containing codes AA through AChave semi-open impellers. Casing Nozzle and
Impeller Sizes containing codes BA through EG have closed impellers.
Figure A. Ordering Code

3
E. SAFETY PRECAUTIONS. This manual is
written with the intent to provide safe instructions
for installing, operating, and maintaining 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 and/or parts.
Throughout the manual, note various cautions,
which are intended to remind personnel to
properly handle of the unit. Note warnings,
which are strategically placed to ensure safety
for personnel. Warnings are indicated by the
following symbol:
Carefully read ALL warnings to ensure safety of
personnel.
Variations exist in the equipment used with
these pumps and in particular, installation of the
pump and driver. This manual contains general
rules for installation, operation, and maintenance
of the driver. Contact the driver manufacturer for
specific operating instructions.
Observe and understand all caution or danger
tags attached to the equipment or disclosed in
the information contained herein.
The following general safety precautions do not
relate to any specific procedure within this
manual but are pertinent to providing a safe
working environment for personnel.
CAUTION
Various federal, state, and local laws
and the regulations concerning OSHA
affect installation, use, and operation of
pumping equipment. Compliance with
such laws relating to the proper
installation and safe operation of
pumping equipment is the responsibility
of the equipment owner. All necessary
steps should be taken by the owner to
assure compliance with such laws
before operating the equipment.
1. Prior to working on pump or driver,
ensure all switches and circuit
breakers have been locked in the
open (off) position and tagged, “Out
of Service.”
2. All circuits NOT known to be dead
must be considered live at all times.
3. Do NOT wear loose or torn clothing
around rotating machines. Do NOT
wear jewelry or watches around
rotating machines.
4. While working near electricity, do
NOT use metal rules, flashlights,
metallic pencils, or any other objects
having exposed conducting
material.
5. Ensure you are NOT grounded
while adjusting electrical equipment
or using measuring equipment.
6. In general, use only one hand when
servicing live electrical equipment.
7. De-energize all electrical equipment
before connecting or disconnecting
meters or test leads.
8. When connecting a meter to
terminals for measurement, use a
range higher than the expected
voltage.
9. Check to make sure the frame of the
driver and starter panel are securely
grounded before operating pumping
unit or performing any tests or
measurements.
10. If a test meter is held or adjusted
while voltage is applied, ground
case of meter before starting
measurement. Do NOT touch live
equipment while holding meter.
Some moving vane-type meters
should not be grounded nor held
during measurements.
11. Do NOT use test equipment known
to be damaged or in poor condition.
II. INSPECTION AND STORAGE.
A. INSPECTION. Upon receipt of the shipment,
check for missing or damaged items. Unpack
and inspect the pump, driver assemblies, and
individual parts. Carefully inspect all boxes and
packing material for loose parts before
discarding. Immediately report to the factory and
to the transportation company any missing parts
or damage incurred during shipment. File a
“damage and/or lost in shipment” claim with the
carrier. NOTE
The pump and equipment, as shipped
from Carver Pump Company, have
appropriate protection for short-term

4
storage. If the equipment is NOT
immediately installed and operated,
store the equipment in a covered, clean,
dry, well-ventilated location, free from
vibrations, moisture, and rapid or wide
variations in temperature.
The pump is shipped with flange covers to
protect flange faces and prevent foreign matter
from entering pump. Keep flange covers intact
until suction and discharge piping are connected
to pump flanges.
B. STORAGE. If the equipment is NOT
immediately installed and operated, Carver
Pump Company recommends rotating each
shaft several revolutions at least once every two
weeks. This is done to prevent flat spots on ball
bearings and indentations in the race of the ball
bearing, which is termed “false brinelling.” False
brinelling oftentimes causes early bearing
replacement. For information regarding bearing
lubrication, refer to section VI, Maintenance,
item B, Bearing Lubrication.
Consider a unit to be in storage if any of the
following occur:
•The pump has been delivered to the
job site and is awaiting installation.
•The pump has been installed but
operation is delayed pending
completion of construction.
•There are long (30 days or more)
periods between operating cycles.
•The plant (or department) is shut
down for periods of longer than 30
days.
CAUTION
A pump, which is made of cast or ductile
iron that sits in extreme heat, high
humidity, or full or partially full of water
over 30 days will rust and will most likely
seize. If the pump rusts and/or seizes, a
complete overhaul and repair may be
necessary to refurbish the pump.
Storage requirements vary depending
on the length of storage, climatic
environment, and the equipment. For
storage periods of three months or
longer, contact a representative from
Carver Pump Company for specific
instructions. Improper storage will
damage the equipment and will require
non-warranty restoration and/or non-
warranty product failures. For pump
disassembly and assembly procedures,
refer to section VII, Service and Repair.
When disassembling the pump, replace
and repair rusted and/or worn parts, as
necessary. NOTE
If the customer anticipates the
pump/equipment may be subject to an
extended period of storage after
installation, (for example, a unit used for
season operation), contact a
representative from Carver Pump
Company. If this is the case, Carver
provides specific instructions for the
equipment during the extended period of
storage. In general, if a pump is shut
down for an extended period, Carver
recommends the following steps:
1. Shut down the pumping unit in
accordance with the operating
procedures outlined throughout this
manual.
2. Turn system suction and discharge
valves to the “off” position.
3. Drain the unit. If freezing
temperatures are applicable, drain
all piping.
4. Fill unit with mineral oil or suitable
non-corrosive protectant compatible
with the system.
5. Lubricate bearings.
6. Provide pump and motor with a
protective cover.
III. INSTALLATION.
Skilled personnel should install the pump in
accordance with engineering standards. Faulty
installation causes operating troubles and
premature wear of parts.
Lift pumping unit with a hoist or suitable
lifting device. Do NOT lift complete unit
using the driver, pump shaft, discharge
piping, or driver eyebolts. Handle
composite parts with extreme care.
Make sure there is enough headroom to perform

5
periodic inspection and maintenance on the
pump and driver. Install units in a dry location
with adequate drainage.
NOTE
Always submerge thepump in enough
fluid to prevent vortices from forming. If
large vortices form, air enters the
suction and causes an imbalance of the
impeller and the pump to run dry. If
these vortices form, damage may occur
to the pump and/or its parts. For
information on how to order replacement
parts, refer to section I, General
Information, item D, Parts Ordering.
The pump is generally supplied with coupling,
motor, and baseplate. The complete set is
assembled at Carver Pump Company. After
ascertaining the unit has suffered no damage in
transit, install the pumping unit.
A. INSTALLATION CHECKS. Use the following
installation checks to ensure proper operation of
pump:
1. LOCATION. Install the pump close
to the fluid. Use a short, direct
suction pipe to keep suction losses
at a minimum. If possible, locate the
pump so fluid will flow by gravity to
the suction opening. Direct the
discharge piping with as few elbows
and fittings as possible. The total
net positive suction head available
(NPSHA), which includes the
suction lift and pipe friction losses,
must be greater than the net
positive suction head required
(NPSHR) by the pump.
2. FOUNDATION. Consider the
following criteria for a foundation:
three to six inches wider and longer
than the baseplate, a level surface,
sufficient mass to prevent vibration,
and form a permanent rigid support
for the unit. The best foundations
are concrete with appropriately
sized anchor bolts. The anchor bolts
are embedded in the foundation in
pipe sleeves having an inside
diameter 2-1/2 times larger than the
bolt diameter. This will ensure
accurate position of the unit. Ensure
the concrete surface is clean, yet
rough.
3. LEVELING OF UNIT. Install unit
onto foundation. Position base so
anchor bolts are aligned in middle of
holes in base. On all frame-mounted
units, always disconnect the
coupling halves. Do NOT reconnect
coupling halves until all alignment
operations are complete.
To support the base, place metal
shims or metal wedges directly
beneath the area of the base, which
supports the most weight. Space the
shims or wedges close enough to
give even support and stability.
Adjust metal supports or wedges
until suction and discharge flanges
are level. Accomplish alignment and
leveling corrections by adjusting
supports under the base. When
proper alignment is obtained, tighten
foundation bolts by hand. Recheck
alignment before grouting. Tighten
bolts snugly.
CAUTION
Do NOT straighten base with anchor
bolts.
4. COUPLING ALIGNMENT. On frame-
mounted pumps, check alignment of
pump and driver shafts. Check to make
sure pump and driver shafts turn freely
by hand. If driver is mounted and
aligned at the factory, realign at the site
since misalignment may occur during
transport and installation. This must be
done before grouting the baseplate and
connecting the piping.
Standard couplings are Lovejoy
Elastomeric Jaw couplings, type AL,
with snap-wrap spiders or sox spiders.
Flexible couplings can only absorb
limited misalignment of the shafts.
To check the coupling alignment use the
following directions (refer to figure 1):
a. Parallel alignment is checked
with a straight edge across the
outside of both coupling halves.

6
Measure distance A or B
between the straight edge and
both shafts. Repeat measuring
at two locations 120 degrees
apart on periphery of coupling.
DO NOT ROTATE COUPLING.
The difference between the
three measurements for A and
B must not exceed 0.005 inches
at any of the positions.
b. Angular alignment is checked
with a dial indicator. The
coupling must be connected
before checking angular
alignment. Mount the dial
indicator on one coupling half
and take a reading from back of
other coupling half. Rotate
coupling hub. Record total
indicator readings at ninety
degree intervals. Total indicator
readout (T.I.R.) must not exceed
0.015 inches between the four
readings.
c. Coupling gap dimensions
(dimension “C” on figure 1) are
as follows:
•Coupling number AL-
090 is 17/32 inch.
•Coupling number AL-
100 is 3/4 inch.
•Coupling number AL-
110 is 7/8 inch.

7
5. DIRECTION OF ROTATION. Before
connecting the coupling halves, bump
start driver and verify rotation is correct.
On frame-mounted pumps, an arrow on
the bearing frame indicates correct
rotation. On closed-coupled pumps, an
arrow on the backcover indicates correct
rotation. The standard direction of
rotation, viewed from the motor end is
clockwise.
6. COUPLING GUARD. On frame-
mounted pumps, place coupling guard
over the coupling and bolt to base.
Check safety codes and always
install protective guards or shields
as required by various federal, state,
or local laws and the regulations
concerning OSHA.
7. GROUTING. When coupling alignment
is correct and suction and discharge
flanges are level, grout the unit using a
high-grade, non-shrinking grout. Fill the
entire base with grout. Check to make
sure all gaps are filled.
NOTE
Allow the grout to fully cure before
firmly tightening the foundation
bolts.
8. PIPING.
CAUTION
Connect piping and gauge lines with
pump in a freely supported state.
Support all piping to avoid undue
pipe strain or weight on the pump.
Do NOT force piping. Do NOT use
pump as an anchorage point for the
piping. Pipe strain causes wear
and/or damage to parts.
Take extreme care when connecting
new piping lines to ensure no foreign
matter such as dirt, chips, tools, etc., is
in the piping, tank, or return piping.
Debris drawn into the pump may cause
excessive damage and imbalance.
Ensure discharge piping is one or two
sizes larger than pump flange sizes,
especially where piping is considerably
long. Equip any flexible joints installed in
the piping with tension rods to absorb
piping axial thrust.
Check to make sure the suction pipe is
air tight and sloped upward to pump
flange to avoid air pockets, which will
impair pump operation. Direct discharge
pipe as close as possible using a
minimum number of valves to reduce
pipe friction losses.
Never use a straight taper (concentric)
reducer in a horizontal suction line
because air pockets may form in the top
of the reducer and the pipe. Carver
recommends using an offset (eccentric)
reducer.
Install a check valve and closing valve in
discharge line and a closing valve in
suction line. The check valve, between
the pump and valve, protects pump from
liquid hammer and prevents reverse
rotation in the event of a power failure.
Closing valves are used in priming,
starting, and pump shutdown.
CAUTION
Never throttle pump with a valve in
the suction line.
CAUTION
After all piping is connected, re-
check coupling alignment.
9. MOTOR. Connect wiring to motor. Due
to high voltage required to operate the
pumping unit, familiarize personnel
handling the equipment with electrical
safety practices and modern methods of
resuscitation. Refer to the motor
manufacturer’s specific instructions
regarding installation, operation, and
maintenance of the driver.
10. Since the pumping unit is shipped with
bearings packed, initial greasing is not
necessary, unless pumping unit has
been in storage for an extended period
of time. Refer to section II, Inspection
and Storage, for specific storage

8
requirements.
11. Connect electrical power supply to
motor.
12. Open system valves.
IV. OPERATION.
A. PRE-START CAUTIONS.
Before activating the pumping unit,
check to make sure there are no
personnel performing maintenance on
the unit. As a result, serious injury or
death to personnel could occur if unit is
activated.
Before starting or operating the pumping unit,
read this entire manual and conduct the
following checks:
1. Before starting the pump, rotate shaft by
hand to assure all moving parts are free.
2. Before starting the pump, install closed
guards around all exposed rotating
parts.
3. Observe all caution or danger tags
attached to the equipment.
4. Do NOT run pump dry. Dry running may
result in pump seizure.
5. Before starting the pump, fill casing and
suction line with liquid. Prime the pump
with an ejector or vacuum pump.
6. Before starting a mechanical seal pump
equipped with external flush lines, turn
on seal liquid, and confirm the seal
liquid is at sufficient pressure.
7. If excessive vibration or noise occurs
during operation, shut the pump down
and consult a Carver representative.
8. Use a check valve in discharge piping if
there is a high volume of reverse flow.
9. Check level in tank to ensure the pump
is submerged in fluid.
10. Check to make sure fluid in pump is
clean, clear, and free of debris.
11. Standard grease lubricated pumps are
shipped with factory lubrication packed
bearings. Lubrication is adequate for a
minimum of 1,000 operating hours or six
months of continuous operation under
normal conditions. After extended
storage or exposure to unusually humid
or hot environmental conditions, check
the bearings and lubricant before
operating the unit.
12. Reference Table A, Torque Values, to avoid
equipment damage and injury to personnel.
Troubleshoot the aforementioned checks using
Table 1, Troubleshooting, or contact your
nearest Carver Pump Company representative.
B. PRIMING. Since the liquid pumped functions
to lubricate various internal parts, dry running a
centrifugal pump can result in extensive damage
and possible seizing. Therefore, it is imperative
the pump is primed prior to initial start-up.
Maintain prime through subsequent start-stop
cycles.
The priming procedure is different for positive
and negative suction head systems. Follow the
procedures below for the different systems:
Positive Suction Head:
1. Open vent on the highest point on the
pump casing.
2. Open all suction valves.
3. Allow liquid to flow from vent hole until
all air bubbles are vented. Then, close
the vent.
4. The pump is now primed.
Negative Suction Head:
1. Install an ejector or vacuum pump on
the vent at the highest point on the
casing.
2. Close the discharge valve.
3. Open the suction valve.
4. Start the ejector or vacuum pump.
5. Allow liquid to flow until a continuous
flow is exhausted from ejector. Close
valve to the vent.
6. The pump is now primed.
C. STARTING THE PUMP. The pumping unit
operates without operator intervention once
system valves have been adjusted to the
specified pumping conditions. When the casing
of the pump is submerged into the fluid pumped,
the pump is rendered self-priming. Before
starting the unit, refer to section I, General
Information, item E, Safety Precautions.
Proceed with operation as follows:
1. Check to make sure personnel are not
working on pumping unit.

9
2. If the pumping unit has been idle for a
period of time, make sure unit is firmly
attached to its foundation.
3. If unit is equipped with seal cooling
lines, turn on seal cooling liquid.
4. Open valves to pressure gauges in
system.
5. Check pump for proper priming and
lubrication.
6. Jog starter switch on motor to check
direction of rotation. Correct direction of
rotation is shown using a directional
arrow on the pump motor bracket.
Standard direction of rotation is
clockwise when viewed from fan end of
motor.
7. Partially open discharge valve.
8. Start the pumping unit in accordance
with the directions on the electrical
power supply.
9. Slowly adjust discharge valve to
operating conditions required. Refer to
the pump nameplate for design point
condition.
10. Pumping unit is now in full operation.
D. STOPPING THE PUMP.Stop the pump
using the following procedure:
1. If pump is stopped for overhaul, slowly
close discharge valve. Otherwise, leave
discharge valve set at condition.
2. Stop the pumping unit in accordance
with the directions on the electrical
power supply.
3. If the pump is stopped for overhaul,
close pressure gauge valves.
4. If unit is equipped with seal cooling
lines, turn off external coolingliquid line
to seal.
5. The pumping unit is now in the off
position.
Before disassembly/assembly, review Table A,
Torque Values to avoid equipment damage and
injury to personnel.
Table A. Recommended Torque Values (ft-lbs)
Bolt Size Material
Steel (or otherwise
noted) 316 Stainless Steel
¼”-20 57
5/16”-18 11 12
3/8”-16 18 21
½”-13 39 45
5/8”-11 83 97
¾”-10 105 132
7/8”-9160 203
1”-8236 300
V. TROUBLESHOOTING.
The pump should provide reliable service and
long life if the installation and starting
procedures outlined in this manual are followed.
If operating problems occur, refer to Table 1,
Troubleshooting, to eliminate some of the most
common causes of those problems.

10
Table 1. Troubleshooting
SYMPTOM PROBABLE CAUSE REMEDY
Motor will not start. •No input power.
•Improper voltage.
•Motor overload.
•Mechanical obstruction that
prevents rotor from turning.
•Check connections to
electrical power source.
Check fuses or circuit
breakers. Check terminals
at source of power input.
•Check voltage at motor
terminals.
•Refer to “Overload on
motor”.
•Examine and clean pumping
unit thoroughly. Check for
bearing failure or bent shaft.
Motor overheats. •Motor overload.
•Improper voltage.
•Obstruction in ventilation.
•Insufficientcoolingmedium.
•Overgreased motor
bearings.
•Improper use of motor
grease.
•Refer to “Overload on
motor”.
•Check voltage at motor
terminals.
•Check ventilation opening
of motor. Keep clear of
obstructions at all times.
•Check ambient
temperature. Motor
temperature should not
exceed ambient
temperature plus the rated
temperature increase of the
unit.
•Remove lubricant from
bearing chamber until the
proper amount of grease is
in chamber.
•Remove grease and
replace with grease and
grease amount
recommended by motor
manufacturer.
Failure to deliver fluid. •Pump not primed.
•Discharge valve closed.
•Discharge head above
shutoff.
•Suction lift higher than
pump rating.
•Impeller or suction pipe
clogged.
•Wrong direction of rotation.
•Liquid level in tank too low.
•Suction strainer is plugged.
•Prime pump in accordance
with section IV, Operation,
item B, Priming.
•Check discharge valve.
•Consult with nearest Carver
PumpCompany
representative or factory.
•Consult with nearest Carver
PumpCompany
representative or factory.
•Inspect and clean impeller
andsuctionpipe.
•Check power connection to
motor.
•Add liquid to system.
•Cleansuctionstrainer.

11
Table 1. Troubleshooting (cont.)
SYMPTOM PROBABLE CAUSE REMEDY
Reduced capacity and/or
pressure (cont). •Damaged impeller.
•Impeller or suction pipe
partially clogged.
•Suction pipe too close
to bottom of tank.
•Liquid level in tank too
low.
•Total head too high.
•Wrong rotation.
•Air leak in suction
piping, seal housing, or
gaskets.
•Speed too low.
•Semi-open impeller
running clearance too
large.
•Enclosed impeller
clearance between
suction cover or wear
ring is too large.
•Suction strainer is
plugged.
•Incorrect impeller
diameter.
•Replace impeller.
•Inspect and clean
impeller and suction
pipe.
•Reduce length of pipe.
•Add liquid to system.
•Consult with nearest
Carver Pump Company
representative or
factory.
•Check power
connections to motor.
•Search for, locate, and
isolate air leak and
repair.
•Consult with nearest
Carver Pump Company
representative or
factory.
•Checksemi-open
impeller clearance in
accordance with
section VII, item E,
Assembly of Pump,
step 15.
•Check enclosed
impeller clearance in
accordance with
section VII, item D,
Parts Inspection.
•Cleansuctionstrainer.
•Trim impeller diameter
in accordance with
conditions set on pump
nameplate.
Pump surges. •Liquid level in tank too
low. •Add liquid to system.
Pump loses prime after starting. •Suction lift is over six
feet.
•Liquid level in tank too
low.
•Check with vacuum
gauge.
•Add liquid to system.
Overload on motor. •Head lower than that
for which pumpis
designed.
•Mechanical defects of
pump or motor such as
bent shaft, binding or
rubbing rotating
element.
•Consult with nearest
Carver Pump Company
representative or
factory.
•Replace defective parts
or replace pump or
motor.

12
Table 1. Troubleshooting (cont.)
SYMPTOM PROBABLE CAUSE REMEDY
Overload on motor (cont). •Liquid handled of
higher specific gravity
or lower viscosity than
intended application.
•Incorrect impeller
diameter.
•Consult with nearest
Carver Pump Company
representative or
factory.
•Trim impeller diameter
in accordance with
conditions set on
performance curve.
Insulation failure. •Oil or water soaked
windings.
•Improper voltage.
•Return motor to the
motormanufacturer.
•Check voltage at motor
terminals.
Excessive leakage around seal
housingorstuffing box. •Faultymechanical seal.
•Improper adjustments.
•Replace mechanical
seal in accordance with
the procedures set
forth in section VII,
Service and Repair,
item E, Assembly of
Pump.
•Check and adjust.
Repair and replace, as
necessary.
Operation at incorrect speed. •Improper line voltage or
frequency.
•Overload.
•Motor electrical
problem.
•Check line voltage.
Ensure voltage meets
requirements set forth
on motor nameplate
data.
•Check nameplate
rating.
•Check motor for loose
or open connections.

13
VI. MAINTENANCE.
Generally, the pumps do not need continuous
supervision. Occasional visual checks are
recommended. Data should be recorded for
each pump to keep track of performed
maintenance and to note operational problems.
The record, “Notes on Inspection and Repairs,”
is provided for this purpose at the front of this
manual.
A. FIELD INSPECTION. Shutdown is not
required. Perform field inspection at regular
intervals and use the following checks:
1. Check and record the suction and
discharge pressures to establish
differential head. It should conform to
the pump nameplate.
2. Check and record power input and
speed of driver.
3. Check and record pumping
temperatures.
4. Check pump for quiet running.
5. If mechanical seal option is on pump,
check seal housing for leakage.
When first starting the pumping unit,
check the area around the seal housing
for leakage. Minor leakage through the
seal usually stops after a short time. If
leakage continues and there is more
than 5 drops per minute at the seal
housing, replace mechanical seal with
new seal. To replace or install new
parts, disassemble the pump in
accordance with section VII, Service
and Repair, items A and B, and
assemble pump in accordance with
section VII, item E, Assembly of Pump.
B. BEARING LUBRICATION. Lubrication
frequency depends on operating conditions.
Normal duty calls for lubrication every 1000
hours of operation. Bearings are lubricated at
Carver Pump Company with Amoco Rykon
Premium Grease No. 2EP, a non-soap, polyurea
thickened grease with a drop point of 450
degrees Fahrenheit. This grease was selected
due to its suitability to extreme pressures and its
high temperature stability.
CAUTION
Do NOT mix greases with differing
properties.
Polyurea base greases are NOTcompatible with
lithium or soda soap base greases. Therefore,
the type of grease added should not vary.
However, if it is necessary to change grease
types, the bearings, bearing frame, and bearing
cap and/or cartridge should be thoroughly
cleaned and flushed with suitable solvent to
remove all traces of old grease. If equipped, fill
the bearing’s autogreaser. Remove bearings in
accordance with section VII, Service and Repair.
For proper lubrication of bearings use the
following procedures:
To properly lubricate driver bearings, refer to the
manufacturer’s specific instructions.
Grease Lubrication
1. Place bearings, bearing frame, and bearing
cap and/or 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 bearings,
bearing frame, and bearing cap and/or
cartridge, rinse in a clean, light mineral
solvent and agitate vigorously to remove all
loosened hard grease and dirt.
3. Dip bearings in clean, light oil and spin by
hand to determine that all foreign matter has
been removed.
4. After cleaning, repack bearings half full on
both sides with good quality ball bearing
grease.
Bearing Lubrication
To lubricate bearings, use the following
procedure:
CAUTION
Overgreasing creates heat and is the
cause of many problems requiring
repair. Do NOT overgrease. To prevent
overgreasing, use a hand-operated
grease gun.
1. Never lubricate pump bearings while
operating unit. If necessary, shut down
pump in accordance with section IV,
Operation, item D, Stopping the Pump.

14
CAUTION
Do NOT lubricate bearings with a power
grease gun.
2. Bearing temperature may rise above normal
immediately after lubrication, but should
stabilize within four and eight hours.
3. Using a hand-operated grease gun on fitting
located on top of bearing frame, add
approximately one ounce of fresh grease for
each bearing. With most hand-operated
grease guns, two or three pumps are
enough. When installing new bearings, pack
new bearings only half full with grease.
NOTE
Carver recommends replacing
bearings if removed from the shaft.
If it is necessary to reuse bearings
that are in good condition, use
proper bearing lubrication
procedures outlined in this section.
VII. SERVICE AND REPAIR.
A. PREPARATIONS FOR DISASSEMBLY AND
ASSEMBLY OF PUMP.
1. Read this entire section and study the
applicable sectional drawing, figures 2
or 3, before disassembling the pump.
2. Stop pump in accordance with section
IV, Operation. Disconnect, lock out, and
tag electrical power supply to motor.
Disconnect wiring from motor.
3. Shut off and tag all valves controlling
flow of liquid to and from pump. Drain
casing (1) by removing pipe plug from
casing bottom. If necessary, flush pump
to remove corrosive or toxic pumpage.
Install pipe plug in casing once fluid has
completely drained. Disconnect piping
and gauges, as necessary.
If pumping unit is pumping hazardous
fluid, take extreme care to ensure safety
of personnel when draining pump. Use
suitable protective devices and/or wear
protective clothing.
NOTE
Prior to assembly, refer to the following
paragraphs in this section: Parts
Inspection (item D), and Wear Ring
Replacement (item F).
During disassembly, mark parts to determine
their proper location before beginning assembly.
When removing capscrews, use socket or box-
ended wrenches instead of open-ended
wrenches. After prolonged operation,
components may adhere to shaft. In such
instances, use rust solvent and apply suitable
extracting tools, wherever possible. Do NOT use
force under any circumstances.
Refer to the appropriate sectional drawing to
locate parts followed by an item number.
Assemble the pump in accordance with
accepted rules of engineering practice.
B. DISASSEMBLY OF PUMP. Disassemble the
pumping unit using figures 2 or 3, and the
following procedure:
1. Remove coupling guard and disconnect
coupling from frame-mounted pump.
CAUTION
To lift pump and/or motor, use a two-
man lift or suitable lifting device.
2. Disconnect tubing and tubing fittings, as
necessary.
3. Unbolt bearing frame (19) or motor from
base and move pumping unit to open
working area.
4. Remove washer (645) and nut (615)
from stud (630). Slide gland (17)
towards slinger (40).
5. Remove capscrews (600) from
backcover (11) and casing (1). On
frame-mounted pumps, remove rotary
assembly from casing and take to a
suitable work area. On close-coupled
pumps, remove rotary assembly along
with motor and take the items to a
suitable work area.
6. Remove impeller capscrew (26),
impeller o-ring (89C), impeller washer
(28), and impeller gasket (73X). The

15
best tool to remove impeller capscrew
(26) is a hex wrench welded to a socket
head.
CAUTION
Use extreme care handling impeller.
7. Remove impeller (2) from shaft.
Remove impeller key (32).
CAUTION
Do NOT pry composite parts. Damage
may occur to composite parts if they are
struck with force, pounded with a metal
object, or pried.
8. Remove capscrews (601) from
backcover (11) and adaptor (71).
Remove backcover (11) from adaptor
(71) and from shaft (6). Remove o-ring
(89) from backcover (11).
NOTE
Replace used o-rings, seals, gaskets,
and bearings with new o-rings, seals,
gaskets, and bearings.
9. On pumps equipped with mechanical
seal (90), remove seal spacer (68) and
mechanical seal (90) from shaft sleeve
(14) or (14A).
10. Remove shaft sleeve (14) or (14A),
sleeve gasket (73), gland (17), and o-
ring (89X) from shaft (6).
11. Remove slinger (40) from shaft (6).
C. DISASSEMBLY OF POWER FRAME ON
FRAME-MOUNTED PUMPS.
1. Remove capscrews (605). Disconnect
adaptor (71) from bearing frame (19).
2. Remove socket head bolt (608) from
bearing cap (35). Remove bearing cap
(35) from shaft (6). Remove shaft
assembly from bearing frame (19).
3. Crimp tang on bearing lockwasher (69)
and remove bearing locknut (22).
4. Remove bearings (16 and 18) from
shaft.
D. PARTS INSPECTION.
NOTE
Mark or number each component while
disassembling to ensure correct
sequence. Remove or unscrew
individual components, as necessary.
1. Clean all parts thoroughly or replace
with new parts, as necessary. All sealing
faces should be perfectly clean. Carver
recommends replacing all grease seals,
lip seals, oil seals, gaskets, glands, and
o-rings. Additionally, replace any locking
devices with a nylock feature with new,
if disturbed from position.
2. Discard used oil seals, shims, and o-
rings. Thoroughly wash and clean all
parts with a suitable solvent.
3. Check shaft for runout, scratches,
grooves, or possible damage. Remove
scratches and grooves with a polishing
cloth and inspect for remaining grooves
or deep scratches.
4. Inspect bearings (16 and 18) for
damage. Damaged bearings must be
replaced. If bearings are removed from
shaft, Carver recommends replacement
of bearings. As bearings are removed
from shaft, mark parts to determine
correct location before beginning
assembly. If bearing replacement is not
possible and bearings are in good
condition, clean and lubricate the
bearings in accordance with section VI,
item B, Bearing Lubrication. Provide
appropriate protection for bearings until
time of usage.
5. Check all shaft sleeve and spacer
sleeve surfaces for score marks,
scratches, pits, grooves, or burrs.
Remove blemishes with a polishing
cloth and inspect for remaining grooves
or deep scratches. Remove burrs with a
file. Carver recommends replacing shaft
sleeves or spacer sleeves if any marks,
pits, or grooves are still visible. The
shaft sleeve is slip-fitted to the shaft for
easy removal.
6. Inspect for bent shaft (6) and replace
shaft, if necessary. Shaft threads should
be in good condition. Bearing seats
must be in perfect condition.
7. If impeller (2) shows excessive wear
due to abrasion or corrosion, and

16
performance cannot be restored,
impeller must be replaced. If new
impellers are installed, make sure all
impellers are balanced.
8. If the suction cover on an open impeller
pump shows excessive wear on the face
due to abrasion or corrosion, and
performance cannot be restored,
replace suction cover.
9. Inspect and replace any defective
grease fittings.
10. If a closed impeller pump is equipped
with optional suction cover wear ring,
check the clearance as follows:
a. Measure outside diameter of
front impeller hub in three
places. Refer to Table 2,
Enclosed Impeller Clearance.
b. Measure inside diameter of
wear ring in three places.
c. If difference between high
reading of inside diameter of
wear ring and low reading of
outside diameter of impeller hub
exceeds double the maximum
clearances given in Table 2,
replace wear ring in accordance
with section VII, Service and
Repair, item F, Replacement of
Optional Wear Ring on Pumps
Equipped with Closed Impellers.
Refer to Table 2 for factory wear
ring clearance.
11. Inspect mechanical seal faces and seal
spacer. They must be in perfect
condition. Replace, as necessary.
Table 2. Enclosed Impeller Clearance
Ordering Code
(refer to Figure A) Pump Size Front Wear Ring Clearance (inches) Back Wear Ring Clearance (inches)
BA 1-1/4 X 1 X 7 .012/.016 N/A
BB 1-1/2 X 1-1/4 X 7 .014/.018 N/A
BC 2-1/2 X 2 X 7 .012/.016 N/A
BD 3 X 2-1/2 X 7 .014/.018 N/A
BE 4 X 3 X 7 .014/.018 .012/.016
BF 5 X 4 X 7 .015/.020 .012/.016
CA 1-1/2 X 1-1/4 X 10 .011/.014 N/A
CB 2 X 1-1/2 X 10 .012/.016 N/A
CC 2-1/2 X 2 X 10 .012/.016 N/A
CD 3 X 2-1/2 X 10 .012/.016 .012/.016
CE 4 X 3 X 10 .012/.016 .012/.016
CF 5 X 4 X 10 .012/.016 .012/.016
CG 6 X 5 X 10 .021/.026 .021/.026
DA 2 X 1 X 11 .012/.015 .012/.015
DB 4 X 2 X 11 .016/.020 .016/.020
DC 4 X 3 X 11 .016/.020 .016/.020
DD 5 X 4 X 11 .016/.020 .016/.020
DE 8 X 6 X 11 .019/.023 .019/.023
EA 2-1/2 X 1-1/2 X 13 .020/.023 N/A
EB 2-1/2 X 2 X 13 .020/.024 .020/.024
EC 3 X 2-1/2 X 13 .016/.020 .014/.018
ED 4 X 3 X 13 .017/.020 .014/.018
EE 5 X 4 X 13 .018/.022 .014/.018
EF 6 X 5 X 13 .017/.021 .014/.018
EG 8 X 6 X 13 (frame-
mounted only) .019/.022 .014/.018