Q-Pumps QC Series Manual

Maintenance service and
installation manual
QC Series
Centrifugal Pump
www.qpumps.com
QC-M02
[e-mail]

2
Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
CONTENTS
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Q-Pumps Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
important safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Instalation guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
How to install the piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Assembly preliminaries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Exploded Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Beggining the assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Leg bracket assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Adapter assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Spacing of the impeller and stub shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Assembling and installing the mechanical seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Kit plus assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Industrial T21 seal assembly -IC+ series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
General assembly inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Impeller retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Casing assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Before turning on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Thank you for purchasing a Q-Pumps product!
This manual contains installation, operation, cleaning and maintenance instructions
for the QC, QC plus and IC plus series.
It also includes a part list as well as a troubleshooting chart to assist in determining pump mal-
function and practical advices for the maintenance and operation of the equipment.

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
ABOUT THIS MANUAL
To ensure the best performance of your pump, please read this manual before starting it. You will
nd useful information and instructions for the assembly and disassembly procedures required for the
necessary pump maintenance.
For any questions related to the operation, maintenance or installation, please contact your local
distributor or directly to Q-Pumps:
Q-Pumps S.A. de C.V.
Acceso “A” #103, Fracc. Industrial Jurica
Querétaro, Qro., México, 76130
Call: [phone] y [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.qpumps.com
The information in this manual might change without notice, we recommend to visit our website for any
updates.
Q-Pumps S.A. de C.V. Warranty
Q-Pumps guarantees that all manufactured and sold products are free from defects in materials and
manufacture for a period of one (1) year from the date of shipment. The warranty does not apply to products
which require repair or replacement due to what is considered normal wear. Conditions caused by normal
wear include (but are not limited to standard rotors wear) casing, mechanical seals, gears and bearings wear.
Accidents, operating errors or improper maintenance are not covered by the warranty. Q-Pumps
assumes no liability for incidental, accidental or consequential damages. The purchaser by acceptance
of delivery assumes all liability for the consequences of use or misuse by it, its employees or third parties.
Unless they are approved in advance, Q-Pumps does not assume any costs related to parts and / or
service.
Q-Pumps disclaims any responsibility for modications or conversions to the pump and the system. For
security reasons and functionality use original parts only. The use of other parts voids the warranty and
excludes liability for any consequences.
The pump is designed only for pumping uids under established characteristics in the selection sheet. Any
other use besides the intended one without the prior written consent of the manufacturer’s application,
will result in disclaim of any responsibility from Q-Pumps.
If the pump is stored temporarily or indenitely, avoid weather exposure and protect the connection
ports with plastic plugs supplied with your pump. Turn the pump shaft by hand every two months to
change the rotating position of the bearings.
ABOUT THIS MANUAL

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
IMPORTANT SAFETY INFORMATION
Safety is very important!
DO NOT attempt to modify any Q-Pumps product, the QC series centrifugal pumps have
been designed to be safe and reliable, to do so could create unsafe conditions and void all
warranties.
DO NOT place any Q-Pumps product in an application where general product service
ratings are exceeded. If the maintenance and operation personnel do not observe the
instructions in this manual could result in personal injury or machine damage.
The following DANGER, WARNING, and CAUTION signs and their meanings are used within
these instructions to avoid serious injury and/or possible damage to equipment.
CODE 136530002
(Guard warning)
Safety labels are placed on every pump. DO NOT remove any labeling on any Q-Pumps pro-
duct. Replace any label that is missing.
WARNING
ROTATING SHAFT
DO NOT OPERATE
WITHOUT GUARD IN PLACE
Indicates an imminently hazardous situation
which, if not avoided, will result in death or
serious injury. The word danger is used in the
most extreme cases.
DANGER
Indicates a potentially hazardous situation
which, if not avoided, could result in minor
or moderate injury. May also be used to alert
against an unsafe operating or maintenance
practice.
WARNING
Indicates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION
CODE 136530001
(Rotating direction ccw)
SAFETY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
Before servicing pump, disconnect
electrical power source, carefully relieve
all pressure and drain all fluids from
pump and connected piping.
DESCRIPTION
Before servicing pump, disconnect electrical power source.
The QC series closed-coupled pumps are made up of two sections, power or drive section and
the liquid end or pump section.
The pump is mounted to the frame of the drive motor by means of an adapter, and is coupled
to the motor shaft. The impeller mounts on the stub shaft and is retained by one of the three
methods. The casing is clamped to the adapter, greatly simplifying removal, and also permitting
positioning of the discharge outlet through 360º. The external, balanced seal assures long seal
life. The drive motor is mounted on a frame having adjustable legs providing simple installation
and leveling.
INSTALLATION GUIDELINES
UNPACKING EQUIPMENT
Check the contents and all wrapping when unpacking your equipment. Inspect all parts for
damage that may have occurred during shipping. Report any damage to the carrier.
LOCATION AND INSTALLATION
The pump unit should be located as near as possible to the liquid source and in a position where
the suction piping can be short and direct with a minimum number of elbows and ttings. It
should also be readily accessible for inspection and cleaning.
The pump unit as received from the factory is ready for installation. To install it, attach a hoist if
necessary, loosen the set screws in the adjusting leg brackets, and individually adjust the legs
until the pump is leveled. Tighten the set screws.
Attach the suction and discharge piping. Be sure suction and
discharge piping is properly supported to avoid any strain on the
pump casing.
WARNING
SAFETY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
HOW TO INSTALL THE PIPING
GENERAL
This section provides some do’s and do not’s of piping which will aid in obtaining the maximum
eciency and service from your pump. Piping should be independently supported at both the
suction inlet and discharge outlet. Care should be taken that piping is properly aligned and does
not put any strain on the pump casing. The piping should have as few bends as possible.
SUCTION PIPING
The suction piping should be short and follow a direct route with a minimum number of elbows
and ttings. Elbows should be located as far as possible from the suction inlet to prevent head
loss due to increased friction. Excessive friction losses in the suction line could result in pump
cavitation, causing poor performance, noise, vibration, damage to equipment and possible
damage to uid.
Whenever possible the diameter of the piping at the suction inlet should be increased in size, an
eccentric tapered reducer should be used instead of a concentric tapered reducer to prevent
air pockets from forming and impairing pump eciency. In turn, the eccentric reducer may be
placed at the inlet of the pump and should be positioned so the straight side is up. A horizontal
suction pipe must have a gradual rise to the pump. A high point in the suction line will form an
air pocket and prevent proper pump operation. All joints in the suction line should be air tight, to
prevent air leakage which can reduce pump capacity and eciency.
DISCHARGE PIPING
Position of the pump discharge is preferably either vertical or top horizontal. The discharge piping
should be short and direct with a minimum number of elbows and ttings. Elbows should not be
used at the discharge outlet, as the friction encountered would be increased, resulting in head
loss. However, use of a large discharge pipe than recommended may reduce the total pump
head, but increase the pump volume, which can cause pump vibration due to overload. Use
of a discharge pipe smaller than the pump discharge outlet increases the total pump head but
decreases the volume. If a reducer is required on the outlet port of the pump and the discharge
is vertical a concentric reducer should be used. If the
discharge is horizontal an ec centric reducer should be
used and should be positioned so the straight side is
down.
LOCATING VALVES
In suction lift applications where the lift is not very
high, it may be desirable to install a foot valve, to
facilitate priming, and to prevent draining o of the
liquid back to the source. A throttling valve should
be installed in the discharge piping to provide control
pump ow rate and prevent motor overload.
INSTALLATION

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
ASSEMBLY PRELIMINARIES
Before beginning the assembly procedure identify every element that is going to be installed,
you can use the exploded view and part list shown in pages 6 and 7. During the assembly you
may need the following tools:
1. 1", 3/4", 9/16" and 1/2" Wrenches.
2. 1/8", 5/32", 3/16" and 1/4" Allen wrenches.
3. Rubber mallet.
4. Caliper, useful when assemble seal type “E”.
5. 5/8" & 7/8" Socket – for impeller nut, for QC plus models.
6. 3/8" diameter steel rod – to hold stub shaft plus, for QC plus models.
7. Torque Wrench
Recently it has been added new series to the known QC series: the kit plus, QC plus series and
IC plus series for every specic applications. There are some modications in the assembly in
each one of these series without altering the operation of the equipment.
KIT PLUS (KIT+)
It is made up by a stub shaft plus, a stub shaft collar, a shaft key, an impeller plus, an impeller nut,
front and back impeller gaskets. The collar may use one or two screw according to the pump
model. This assembly works exactly the same as a standard assembly from the QC series.
QC PLUS (QC+) SERIES
The QC plus series have been development to facilitate the assembly of the QC series pumps
oering some advantages. QC plus series have a better subjection when mounting the stub
shaft onto the motor using a collar. The stub shaft plus is threaded and oers a better assembly
to the impeller by means of a key and a nut to obtaining an assembly designed to meet the 3A
regulations. An ordinary QC series pump can be turned into a QC plus series with a Kit plus.
IC PLUS (IC+) SERIES
Series IC plus is a modality of the QC series plus for industrial purposes. It uses an internal
mechanical seal denominated T21 which lodges in an industrial back plate. Because of this
series is industrial does not meet the 3A regulations. No other type of mechanical seal like “D”,
“DG”, ”E” or “F” seals from the QC series is compatible with the IC plus series. An ordinary QC
series pump can be turned into a IC plus series with a Kit plus, an industrial back plate and a
mechanical seal type T21.
WARNING
Before servicing pump, disconnect electrical
power source, carefully relieve all pressure and
drain all uids from pump and connected piping.
INSTALLATION

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
EXPLODED ASSEMBLY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
PART LIST
11
11F
80
80A
80B
80C
80K
80L
11F *
11H
17J
17K
17M
80N
80P
80R
207
209
209A
209B
2P
6P
24C
24D
91A
91B
92
92A
External balanced seal type D
Backplate “D”
Backplate pin
Carbon
Cup seal “D”
O-ring carbon
Spring seal “D”
Set screw collar seal “D”
Drive collar “D”
Clamped-in seat seal type DG
Backplate pin
Backplate “DG”
Gland ring “DG”
Bolt/screws gland ring
Lock washer
Seal seat “DG”
PTFE gasket
PTFE gasket
Leg brackets
Adjustable leg
Adjustable leg bracket
Set screw
Bracket mounting screw
Kit plus
Impeller plus
Stub shaft plus
Shaft key plus
Nut plus
Back gasket plus
Front gasket plus
Drive collar plus
Bolt drive collar
1
2*
1
1
1
1
2
1
2*
1
1
4**
4**
1
1***
1***
4
2
4
4
1
1
1
1
1
1
1
1**
11B
11F
17
17A
17B
17C
80
80B
80G
80H
80J
80M
83C
83D
83E
11F
11P
95
1
2
6E
24
92A
71
71A
71B
75
90
131
131A
132
M
Backplate “E”
Backplate pin
Follower
Machine screw
O-ring
Lock washer
Carbon
O-ring
Cup seal “E”
Spring seal “E”
Drive collar “E”
Set screw drive collar “E”
Stung box “E”
Machine screw
O-ring
Industrial Kit plus
Kit plus
Backplate pin
Industrial backplate
Seal T21
Common components
Casing
Impeller
Stub shaft
Retainer (impeller)
Bolt drive collar
Adapter
Adapter pin
Adapter mounting screw
Clamp assembly complete
Casing gasket
Seal guard assembly
Set screw
Water cascade assembly
Motor
1
2*
1
4**
1
4**
2
2
2
1
1
2
1
4**
1
1
2*
1
1
1
1
1
1
1
1
2*
4
1
1
1
1
1
1
* Not necessary in some models
** Quantity may vary with model
*** Not interchangeable
Water cooled balanced double
seal type E
PART LIST

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
It is highly recommended that you resort to the diagram on page 6 to verify the assemblies and
subassemblies whose directions will follow.
1. LEG BRACKET ASSEMBLY
Sets of leg-brackets are optional and can be used to vertically adjust the pump. The size of the
brackets (209) and the legs (207) depend upon the NEMA or IEC of the motor. First, complete
the primary assembly of the legs and the brackets, using the hexagonal screws (209A) to tighten
the legs to the brackets. Next, use the hexagonal screws (209B) to tighten the brackets to the
motor (210). You may need to lift the motor to complete this part of the assembly.
2. ADAPTER ASSEMBLY
Place the stainless steel adapter on the motor and tighten using four hexagonal screws (71B)
with the torque values recommended on Chart 1
The adapter should be accompanied by two adapter pins, which normally come preinstalled. If
not, insert them in the corresponding drilled holes. These pins serve to set the backplate (11) to
the adaptor (71), hooking the backplate onto the adapter pins using the two backplate pins (11F)
located on the backplate. Depending upon the pump model and seal type, some backplates
do not have pins for reasons of design. The adapter comes with a protective guard (131) which
comes attached by an hexagonal screw (131A). It is highly recommended for reasons of safety
not to operate the pump if this guard is not placed on the adapter.
3. SPACING OF THE IMPELLER AND STUB SHAFT
To set the stub shaft onto the motor, it is necessary to place it at the proper distance. To nd this
position it is necessary to provide a spacing of seventy one-thousandths of an inch (0.070 in.)
between the impeller and the backplate, as shown in Figure A.
You can make this adjustment using a caliper or spacing gage.
Depending on the pump model and the seal type, the backplate requires
two pins (11F ), which serve to hold the backplate in place when mounted
on the adaptor.
The backplate pins should always be placed pointing in a counter-clockwise
direction so that the backplate does not slip. When handling the backplate
be careful not to damage the contact surface of the mechanical seal or the
front side of the backplate.
An explanation on how to place the stub shaft onto the motor follows up
next. Chart 2
BEGINNING THE ASSEMBLY
ASSEMBLY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
The traction between shafts is achieved by friction. By tightening the drive collar bolt (s) (92A),
the drive collar plus (92) and the stub shaft (6P or 6E) closes pressing the motor shaft. To have
an optimum performance it is necessary to align the three groups of the assembly: 1.- The motor
shaft keyway 2.- the groove 3.- the side groove in the drive collar just as shown in Figure B.
Slide the drive collar plus thru the stub shaft all the way, then slide both of them thru the motor
shaft making the three grooves coincide. Remember the motor shaft key is not needed.
STANDARD STUB SHAFT
Place the backplate onto the adapter and turn it in a counter-clockwise direction, locking the
backplate pins (11F ) onto the adapter pins (71A). If necessary pull out the stub shaft so that it is
still mounted onto the motor shaft. Place the retainer (24) into the stub shaft so that it recedes
completely into its slot and insert the impeller onto the stub shaft, making sure that the retainer
falls to one side to secure the impeller. Space the back of the impeller at a distance of 0.070 in.
from the face of the backplate and tighten the set screws in order to secure the stub shaft.
STUB SHAFT PLUS
Next, place the backplate onto the adapter (71) and turn it in a counter-clockwise direction,
pressing it against the adapter so that the backplate pins (11F ) lock onto the adapter pins (71A).
Place the impeller plus (2P) onto the stub shaft after placing the key (24C) into the key slot on the
shaft. Screw on the impeller nut (24D) and tighten until it makes contact with the impeller using
a socket (5/8” or 7/8” depending on the model).
You can use a 0.375 in. steel rod in the side hole of the shaft so that the shaft does not turn
during assembly. Space the impeller at a distance of 0.070 in. from the face of the backplate.
STUB SHAFT TIGHTENING
With the .070 in separation, and tighten the collar screws to set the stub shaft. Use v to nd the
appropiate torque values before tightening, remember to allign the three parts grooves.
IMPORTANT: At this point the adapter is mounted, the stub shaft is xed on the motor, and the
impeller is spaced at a distance of 0.070 in. from the backplate. Take o the impeller and remove
the backplate to begin assembling the mechanical seal.
Place the deector (40) in the ridge found on the standard stub shaft. Stub shafts plus do not
use a deector.
ASSEMBLY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
4. ASSEMBLING AND INSTALLING THE MECHANICAL SEAL
MECHANICAL SEALS. Among the QC, QC plus, and IC plus pump series there exist ve
types of mechanical seals.
One of these, the “T21”, is used exclusively with our IC+ series, specically in non-sanitary
applications. As for the remaining four types, their selection must be based upon the particular
application and the properties of the uid being pumped.
The “D” seal is the most common mechanical seal. It is used when the uid which is going to be
pumped is neither corrosive nor abrasive. It is a balanced, external seal, designed to be long-
lasting.
The “F” seal is exactly the same as the “D” seal, but contains a water-cascade assembly to
lubricate and cool the seal. The water-cascade assembly is located on one side of the adapter.
This seal, although it is sanitary, is very dirty because the coolant tends to drip.
The “DG” seal consists of two parts: one stationary and other rotating. The rotating part consists
of the same elements as the “D” seal. The stationary part consists of one piece which may
be carbon silicone, ceramic, or carbon tungsten, and which is placed in a gland ring. This
type of seal is used when the uid to be pumped is abrasive, corrosive, or contains a product
which impedes the seal lubrication. The stationary seal is made of a very strong material and is
reversible, so ipping the seal is sucient to continue using it. The “E” seal is a double-balanced
seal cooled by water. This seal is composed of a stung box which is lled with uid (normally
water) to cool the mechanical seal. The “E” seal is used in conditions similar to those of the “DG”
seal but in applications that handle extremely high temperatures (up to 500º F). It can also be
used in applications where there exists a vacuum of up to 28 in. of mercury.
EXTERNAL-BALANCED SEAL TYPES “D” AND “F”. Locate the following pieces: carbon
(80), o-ring (80B), “D” seal cup (80A). “D” seal spring (80C), “D” seal drive collar (80L), set
screws (80K), and “D” seal backplate (11). Pre-assemble the set screws, making sure they do
not penetrate the inner diameter of the stub shaft and set the o-ring into the carbon so that it
sits at the back. Next, place the o-ring and carbon together onto the cup so that the cup’s three
legs align with the carbon’s slots. Then, t the spring onto the cup so that the tip of the spring is
touching a fourth, folded leg on the cup. If necessary rotate the spring to touch the two pieces.
When handling the carbon (80), be careful not to bump or scratch the seat of the seal, as this is
the face that makes the seal.
For best assembly, the drive collar has a pin or key that
should t into a slot in the cup. Use pressure to insert
the drive collar, making sure that the pin aligns with the
slot as shown in Figure C.
Slide the entire assembly onto the stub shaft.
The o-ring seals the ow of uid between the pump and
the exterior through the mechanical seal by lling the
space between the stub shaft and carbon.
ASSEMBLY

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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
The seal will provide a resistance when it slides on, so apply pressure until it has gone onto the
stub shaft completely. The position of the drive collar against the o-ring and carbon is critical to
prevent leaks. Now, assemble the “D” seal backplate (11) and x it with the backplate pins. Push
the carbon back with the backplate.
Once the backplate has been placed it is necessary to tighten the “D” seal collar set screws
(80L). To do this, you must exert a pressure on the drive collar towards the backplate, so that
the pin of the drive collar remains aligned with the slot in the cup.
Tighten the set screws once the drive collar has reached its closest point to the o-ring and
carbon. The drive collar should stay in its place against the o-ring – against the back – within the
limits of the carbon, as shown in Figure D. The spring does not
compress entirely.
When all parts are in their correct positions, the stub shaft
should be able to rotate freely when turned by hand. If it is
necessary to use excessive force to turn the stub shaft, check
to be sure that the components of the seal have been properly
installed and that the drive collar is properly positioned.
The “F” seal is the “D” seal with a water-cascade assembly.
The water-cascade assembly (132) should be installed on the
adapter (71), so that the leak falls upon the seal seat of the
carbon, lubricating the seal against the backplate.
IMPORTANT: It is necessary to disassemble some of the
pump parts for cleaning and
sterilizing. For those Q-Pumps products equipped with “D” seals, if a CIP (Clean-in-Place)
instillation is used, disassemble is not necessary. Do not lubricate the seal with grease or oil, the
faces of the seals are lubricated by the uid that is being pumped.
CLAMPED-IN SEAT SEAL TYPE “DG”. This seal type consists of two parts: one
stationary, and one rotating. The rotating part is the “D” seal assembly. For that reason it is highly
recommended that you read the directions above for assembling the “D” seal before continuing.
The stationary part consists of the following elements: “DG” seal seat (80N), PTFE gasket (80P),
PTFE gasket (80R), “DG” gland ring (17J), lock washers (17M), bolts/screws gland ring (17K),
and “DG” seal backplate (11H).
IMPORTANT: Incorrect spacing between the impeller and backplate can result in dangerous
contact between the face of the stationary seal. That contact may wear down the impeller
and the seat of the gland ring. A visual inspection following the installation of the impeller is
recommended to check the spacing of the impeller and seal.
Take the “DG” backplate (11H), turn it around and place the PTFE gasket (80R) against the sert
face. Next, install the seal seat (80N) – which is reversible – followed by the PTFE gasket (80P)
and nally the gland ring (17J). In the seal type “DG”, the seal seat (80N) is enclosed by the gland
ring, which could be made of either silicone, tungsten, or ceramic
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Please remember that the PTFE gaskets (80P) and (80R) are not interchangeable.
The seal seat (80N) is made of a very strong material and therefore is very fragile. It is important to
protect the faces of the stationary seal just as with the backplate, against bumps and scratches.
Screw the gland ring into the backplate, using the screws (17K) and lock washers (17M). Screw
in the backplate pins (11F ) to the backplate if applicable. See Figure E. Just tighten the screws
until the washers are attened, any tighter and you may crack the stationary seal.
Assemble the “D” seal components onto the stub shaft (as explained in the
section regarding the “D” seal) taking care that the o-ring remains inside of
the carbon. Once both preassemblies are complete, that of the “DG” seal
onto the backplate and that of the “D” seal, take the backplate and push
on the “D” seal sliding it onto the stub shaft.
Be very careful not to hit the “DG” seal with the end of the stub shaft. Now,
set the backplate onto the adapter. Although space appears to be limited,
the spring can be compressed until the drive collar completely touches the
o-ring.
Once the backplate is set onto the adapter, push the drive collar against the backplate to
compress the spring. Tighten the set screws to set the seal when the spring no further can
move.
The eciency of the “D” and “DG” seals relies upon the position of the o-ring inside the carbon
as well as the full compression of the spring. Figure F.
“DG” type seal is used to handle uids that
crystallize when allowed to settle for a time.
When pumping abrasive or corrosive uids,
combine the “DG” seal with EPDM gaskets.
EPDM gaskets are resistant to certain harsh
chemicals. For more information, please
contact either the plant or your distributor.
WATER COOLED BALANCED DOUBLE SEAL
TYPE “E”. This mechanical seal is very dierent from
the previous three, although it shares some common
components. It consists of two balanced, rotating
parts, placed into a stung box, which is normally
ooded to cool the seal.
The “E” seal consists of the following parts. Find and
keep them at hand to make the assembly process
easier: stung box “E” (83C), o-ring (83E), machine screw (83D), follower (17), o-ring (17B),
machine screw (17A), and lock washers (17C) for the follower, “E” seal backplate (11B), backplate
pins (11F ), spring (80H), drive collar “E” (80J), set screw drive collar (80M), two carbon seals
(80), two o-rings (80B) and two cups (80G). It is recommended to have a caliper on hand to
assemble this seal precisely.
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QC-M02
The following instructions assume that the adapter is assembled and that the spacing
between the impeller and backplate has been set. If not, we recommend you refer to that section
of the assembly directions.
Place the o-ring (17B) in the groove of the follower (17). Attach the backplate pins (11F ) to the
backplate (11B), take the o-ring (83E) and place it in the slot of the stung box (83C) and place
both parts against the backplate. Screw on the stung box (o-ring in place) to the backplate
with the machine screw (83D). Be sure to protect the faces of the backplate during assembly.
Pre-assemble the set screws (80M) onto the “E” drive collar (80J) without penetrating the inner
diameter.
Slide the “E” drive collar, along with the o-ring, onto the stub shaft (6E), with the o-ring
pointing towards the tip of the stub shaft. Pre-assemble the o-rings (80B) in the carbon seals
(80), pushing them to the back of the seat. Place each carbon seal onto a cup (80G). These are
the two rotating components that will be balanced on the spring (80H) inside the stung box
(83C).
Be very careful when handling the carbon seals, especially when handling the seal seat, because that
face in particular is crucial in maintaining contact between the stung box and backplate.
Carefully slide the carbon seal, o-ring and cup, onto the stub shaft, using the “E” drive collar
(80J) as a support for the o-ring. The seal seat of the carbon should be able to touch the follower
(17). Slide the drive collar onto the stub shaft. Next, we have to secure the drive collar to the stub
shaft at the proper distance (Regardless of stub shaft model). For help, refer to Chart 3 which
indicated the spacing values, then take the Vernier caliper and use it to measure that distance
as shown in Figure G.
Locate the drive collar “E” (80J) and secure it with the set screws (80M). Place the spring (80H) onto
the cup (80G). The drive collar has two pins, which drag both cups along the rotations of the stub shaft.
Each cup has a folded leg that initiates traction with the drive collar. Try to place the pins before the legs
of the cups, facing in a counter-clockwise direction. Figure H.
Now, install the second set of the cup, o-ring and carbon (in that order) onto the stub shaft.
Put the end of the spring into the second cup, just as you did with the rst. The seal seat of the second
carbon seal should point towards the backplate (11B). Take the sub-assembly of the backplate (11B)
with the stung box (83C) and place it onto the adapter (71), making sure that the stung box does
not hit the components mounted on the stub shaft. Push in and rotate the backplate until the pins are
locked. If this model does not have backplate pins, place the casing gasket (90) into the slot on the
backplate, put on the casing (1) and tighten using the clamp assembly (75) to secure the backplate.
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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
IMPORTANT: When you mount the backplate onto the adapter, the seal may supply resistance.
If this resistance is too much, check the seal assembly and be sure the drive tcollar has been
located correctly. The eciency of the “E” seal relies on the proper installation of the drive collar.
The space in the stung box should contain both carbons in a balanced state of pressures and
distances. Figure I.
The next step is to close the stung box. To do this, you need to pull the follower against the
backplate. Use the machine screws (17A) and lock washers (17C) to close it, tightening until the
lock washers are attened. The screws on a circular arrangement can be tighten across and
varying positions when screwing.
It is recommended to set the backplate so that the 1/8 NPT drill-holes on the stung box, point
upward and with a 45º inclination from the horizontal
plane, as shown in Figure J.
The water should enter through one connection and
leave through another, moving through the stung box
and in the process, cooling it.
The ideal quantity of water will depend upon
the temperature of your application. For vacuum
applications it is recommended to use a ow of 10
drops per minute, while maintaining a temperature of
176º F inside the seal around 3 gallons per hour are
required.
IMPORTANT: When servicing pumps with “D”, ”DG”,
”F”, or “E” seals, inspect all disposable parts such
as: carbon seals (be sure they have no bumps or
scratches), o-rings (they should maintain a circular form
and should not be bitten). In the case of abrasive uids, use EPDM material for all gaskets and
o-rings. When dealing with high temperatures, use Viton.
Springs are not subject to wear because of tension or compression, except in extreme cases.
Carbon seals made of silicone, tungsten or ceramic are very fragile but resist abrasive and
corrosive uids.
45º
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QC Series Centrifugal Pump
QC-M02
5. KIT PLUS ASSEMBLY
IMPORTANT: These instructions assume that the adapter has been mounted ti the motor and
the impeller has been spaced at a distance of 0.070 in. from the backplate. If you have not
assembled the sub shaft, please read section 3 before proceeding. Please remember that it is
imperative you align the key slot on the motor shaft, the slot on the stub shaft and the slot on the
drive collar to properly mount the stub shaft, Figure B.
We can easily convert a QC series standard pump to a QC plus series pump with a Kit plus. The
QC plus series is 100% sanitary and meets the sanitary regulations set by 3A. The QC plus series
uses and improved design that mantains a tighter, more sturdy assembly. To assemble a Kit plus,
you must rst nd the following components: drive collar plus (92), bolt drive collar (92A), stub shaft
plus (6P), stub shaft key (24C), back impeller gasket (91A), front impeller gasket (91B), impeller plus
(2P) and impeller nut (24D).
IMPORTANT: In some cases, the front and back gaskets are interchangeable (only models
218/328 and 4410). The Kit plus is compatible with “D”, “DG”, “F”, and “E” seals. The only
dierences are the method of installing the stub shaft to the motor and the retention of the
impeller. Figure K.
IMPORTANT: Before continuing with the assembly of the
Kit plus, put together the seal type that you are going to
use (Please see section 4).
Once you have put together the seal and secures the
blackplate, place the back gasket fot the impeller plus
(91A) into the groove on the stub shaft plus (6P). Next,
place the shaft key (24C) into the key slot on the stub shaft.
Slide the impeller plus (2P) onto the stub shaft and past
the key, using the impeller key slot, making sure that the
back gasket remains in its groove.Insert the front impeller
gasket (91B) into the groove on the impeller nut (24D).
Screw the impeller nut onto the stub shaft making sure
that the front gasket remains in the groove on the impeller
nut.
Tighten the impeller nut using a torque wrench. Use
20 ft-lb for 114+ model and 40 ft-lb for the rest of
models.Figure L.
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Operation and Maintenance Manual
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QC-M02
IMPORTANT: Never start the pump without the stub shaft key in place, as doing so may lead
to friction between the impeller and stub shaft, causing seizure between the parts. Do not forget
to adjust the screws and impeller nut before starting up the pump. If you are using CIP (Clean-
in-Place) installations, there is no need to disassemble the Kit plus. The threads of the stub shaft
and impeller nut are sealed from uid entry thanks to the front and back gaskets, and therefore
are sanitary.
6. INDUSTRIAL T21 SEAL ASSEMBLY – IC+ SERIES
The IC plus series (industrial centrifugal pumps) is another conguration of the QC and QC+
series designed for non-sanitary applications. The IC plus series does not meet 3A sanitary
regulations. An IC plus series pump is composed of the same parts as a standard QC series
pump, but requires the plus Kit to set the stub shaft and install the impeller. It also uses an
industrial internal seal – T21 – and a specially designed backplate. The T21 seal generally comes
as a Kit and is disposable, so if one of the parts is damaged you need to replace the entire Kit.
IMPORTANT: These assembly instructions assume that the adapter has been mounted to the
motor and the impeller has been placed at a distance of 0.070 in. from the backplate. If the stub
shaft has not yet been assembled, please return to section 3 before continuing. To assemble the
T21 seal (95), please identify the following parts:
The ceramic seal, which is reversible, goes inside the lodging, which goes inserted into the
industrial backplate (11P). Place the reversible cup reinforcement into the primary cup so that
the legs align with the slots. Place the rubber gasket (o-ring) into the primary cup so that it sits
at the back and holds in the cup.
Now, place the carbon into the cup, taking care not to damage the seal seat, so that the carbon
aligns with the groove in the cup. Place the backplate – with the ceramic seal seat in place – on
the adapter, taking care not to bump the seal on the stub shaft threads.
Slide the sub-assembly of the carbon and cup onto the stub shaft until it touches the ceramic
seal. Place the shaft key (24C) and back gasket (91A) in their respective slots. Force the spring
into the cup and slide the plus impeller (2P) over the shaft key and onto the stub shaft and push.
Place the front gasket (91B) in the groove on the impeller nut (24D) and tighten the assembly.
Figure M
Industrial seal type T21
Loading seal
(elastomer)
Ceramic
seal seat
Carbon
seal seat
Rubber gasket
(type o-ring)
Primary cup
Cup reinforcement
Spring
Figure N
Seal Components
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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
7. GENERAL ASSEMBLY INSPECTION
Before inspecting your pump’s assembly,
double-check that the electric supply is
disconnected, and that there is no supply
of pressure or uid into the piping.
WARNING
Before continuing please check that all bolts/screws and set screws have been tightened.
Rotate the stub shaft by hand, using the impeller. The stub shaft should rotate easily. If something
is interfering with its rotation, inspect all parts to verify correct assembly (stub shaft, seal,
backplate, etc).
8. IMPELLER RETENTION
IMPELLER RETENTION ON STANDARD STUB SHAFTS. Find the following parts: impeller
(2), retainer (24) and standard stub shaft (6E).
Place the retainer into the drilled hole atop the stub shaft so that it is completely receded.
When you have placed the impeller at the back, make sure that the retainer falls to lock in the
impeller. Figure N.
IMPELLER RETENTION ON STUB SHAFTS PLUS. Find the following parts: impeller plus
(2P), impeller gaskets (back, 91A) and (front, 91B), impeller nut (24D), shaft key (24C) and stub
shaft plus (6P).
Place the shaft key into the stub shaft and place the back impeller gasket (91A) into the groove
on the shaft. Slide the impeller onto the shaft until it reaches the back and place the front gasket
(91B) onto the impeller nut, screwing the nut (24D) onto the impeller. Make sure the gaskets stay
in place. Figure P.
Figure O
Standard stub shafts
and impeller pin
Figure P
Stub shaft plus
and impeller nut
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Operation and Maintenance Manual
QC Series Centrifugal Pump
QC-M02
9. CASING ASSEMBLY
Once the impeller has been installed, the casing must be mounted. Place the casing gasket (90)
onto the groove on the backplate (11, 11B, 11H or 11P), depending on the seal type.
Take the casing (1) and place it onto the adapter, positioning the discharge at the desired
location. Take the clamp assembly (75) and place it around the casing. Tighten the clamp to
close the casing so that it is level around the perimeter. A rubber mallet may be helpful when
installing the casing.
10. BEFORE TURNING ON THE PUMP
• Check that the motor turns in a counter-clockwise direction.
• Keep the suction line ooded and the mechanical seal lubricated with the uid which is going
to be pumped. Never operate the pump when dry or it may damage the seal.
• Maintain a sucient NPSH available in the suction line (please see the section on piping).
ASSEMBLY