Q-Pumps QTS Series User manual

Operation and Maintenance Manual
of Positive Displacement Pump
QTS Series
Twin Screw Pump
www.qpumps.com
QTS-M04
[e-mail]
Aliated02-11

2
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pump Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Know Your Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance: Pump assembly and disassembly . . . . . . . . . . . . . . . . . . . . . . . . .
CONTENT
3
5
8
13
12
14
Q-Pumps S.A. de C.V. Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Damage or Loss During Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Receiving the Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Moving Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Lifting the Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Starting Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Shutting Down Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Restarting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pump General Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pump Arrangements Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
QTS Rotors and Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using Variable Frequency Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Tools and Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Oil and Oil Change . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pump Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Removing the Rotors .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Mechanical Seals Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Uninstalling the Single Mechanical Seals . . . . . . . . . . . . . . . . . . . . . . . 20
Installing the Single Mechanical Seals . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Uninstalling the Double Mechanical Seals . . . . . . . . . . . . . . . . . . . . . . . 23
Installing the Double Mechanical Seals . . . . . . . . . . . . . . . . . . . . . . . . . 25
Rotor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Rotor Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Important Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Annex A: CIP .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Annex B: Nut-and-Locknut Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Base Allignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Risks to consider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
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

4
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
General Information
Every QTS pump is completely assembled, lubricated, synchronized, factory tested and ready
for use. Standard maintenance practices are described in this manual. For more information,
please see the Maintenance section. Following these guidelines will grant a long pump service
life under a proper use and installed in a properly designed system.
If necessary to return the equipment under warranty, or for some other reason, contact Q-Pumps
to receive a Return Material Authorization (RMA).
Damage or loss during shipment
If you receive the equipment in poor condition or it is lost during transport, le a claim with
the carrier immediately. The transport service provider is responsible for collecting the goods,
Q-Pumps ensure they received it in perfect conditions.
Receiving the pump
The pump inlet and outlet ports are covered prior to shipment to ensure that no foreign materials
enter inside the pump during shipping. If the protective covers are missing at delivery, remove the
pump cover and inspect the interior to ensure that it is free of contaminants before energizing
the pump. Please keep nearby the pump serial number; this will help to order replacement parts
and / or make warranty claims. For more information related to shipping damage and warranty
claims please review the General Information or Warranty section in this manual.
ABOUT THIS MANUAL

5
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
SAFETY
IMPORTANT: Read and understand this manual before installation, operation or maintenance of the
pump. Installation, operation and maintenance in combination with inappropriate unsafe practices can
cause serious individual risks or death, damage to the environment and the pump itself. Equipment
damage caused by user negligence will void the pump warranty.
There are safety symbols used in this manual to identify security situations and how to avoid them:
CAUTION: Hazards or unsafe practices that may result in minor injuries or damage to
equipment or property.
DANGER: A situation in which there is a possibility of a potentially harmful incident;
hazards or unsafe practices that could result in serious injury or death.
ELECTRICAL HAZARD: Risk caused by direct electrical energy contact, burns,
electrical shocks, electric arc and re or explosions caused directly by electricity.
ROTATING PARTS: Risks from exposure of personnel to rotating parts that may be
dangerous and cause injuries, contact with these parts when carried out without
employing security practices such as signs, guards, approach alarms, etc.
TEMPERATURE: The main risk is associated with direct contact of hot or cold
sources.
Operate the pump only in accordance with its specic use mentioned in the data sheet and
considering the risk and safety issues described in this manual.
In case of malfunction, the pump must be switched o immediately and the responsible sta must
attend those malfunctions. Do not allow access to the pump to unqualied personnel. Please
contact your distributor.
Avoid operating procedures that endanger the personnel and/or people who are not directly
involved in the process. The user must ensure that authorized and qualied personnel carry out
the relevant activities of maintenance procedures, operation and installation.
Provide safety devices for any of the following cases and ensure their proper performance:
• If conditions of heat, cold and moving parts are presented in place, provide protection
against accidental contact with the pump. Protection must not be removed during the
operation. Guards are recommended.
• To avoid electric shocks, ground all electrical systems properly.
• Provide adequate pressure relief devices to prevent excessive pressure on the discharge
side of the pump between the pump and the rst stop device.
• Always follow local safety guidelines.
SAFETY

6
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Electrical Connections
• A qualied and trained electrician should make the electrical connection to the motor.
• Use safety equipment necessary to manipulate electricity.
• Use appropriate signs in areas where electrical equipment is exposed.
• The pump must be de-energized and secured to prevent startup before starting any work of
electrical equipment.
• Use the right wire number according to the motor voltage and amperage.
• Follow diagram connections shown on the motor nameplate; check the motor installation
manual for any questions.
• Isolate and protect the terminal ports and connections.
• Make sure the rotation of the pump is correct.
• The motor of your pump has been tested and was selected to meet the requirements of a
specic application. The motor amperage consumption should be within the range indicated
on the motor nameplate for a proper operation.
• The user is responsible for the safety and proper operation of equipment when special and
others motors are used (not supplied by Q-Pumps).
Temperature
The QTS Series are designed to work in a normal temperature range between -40 °C (-40 °F)
and 100 °C (212 ° F). Be careful when touching the body and gear case to avoid burns when the
temperature rises. If the application requires a higher temperature range please contact Q-Pumps
to be advised about this case.
Moving Parts
The principal operation of the QTS Series is by the turning of a pair of synchronized rotors which
can trap any foreign object and get stuck due to an invalid equipment operation. Never operate
the pump without the front cover properly in place.
The gearbox contains rotating parts; never operate the pump without the cover of the gear case.
Watch precautions with free turning shafts of drive elements when not properly coupled to the
pump. Likewise, do not operate the pump without the coupling guard placed in position.
Lifting the Pump
Carefully transport the equipment avoiding contact, drops or damage. To prevent this situation the
QTS Series are provided with an eye bolt located on the gear case for lifting.
The same way, gear motors and motors have an eye bolt (or at least one hole for using this part)
located in the body.
SAFETY

7
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Use proper equipment such as elevators or cranes together with slings or straps with the right
capacity to lift the total weight.
Take precautions and follow the manufacturer recommendations to use the slings or straps.
In the case of lifting assemblies motor/gear-motor coupled to the pump, always try to lift them
up simultaneously. Be sure to place the pump assembly on a stable surface. Once assembly is
positioned in place, check that the screws are properly tightened and that the assembly is aligned;
follow directions for coupling alignment section in this manual for this purpose.
CorrectIncorrect
SAFETY

8
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
KNOW YOUR PUMP
Congratulations! You’ve acquired a high technology and quality equipment for your sanitary
pumping solutions. QTS Series is the best solution toward other brands in the market due to its
special characteristics:
• Ideal to pump low and high viscosity uids (up to 1,000,000 cP).
• All wet parts in contact with the uid are made of 316L stainless steel.
• Ideal for handling abrasive products.
• Can speed up to 3,000 rpm depending on the pump model, type of uid and application.
It is a bidirectional pump, so it can help recovering line product.
• Can be used as process pumps as well as a CIP pump reducing cost in additional
equipment and timing.
• Suction and discharge enlarged option available.
• Totally drainable.
• Even when running at high speed, there is no rotor/rotor/body contact.
• Meets 3A and EHEDG (European Hygienic Engineering and Design) standards.
• Low NPSH requirement thanks to its high suction capacity.
• Can pump uids with up to 60% entrained air.
Data Sheet
This document is linked to the serial number of your pump which is printed on the gear case. You
can nd valuable information such as the pump model, type and material of the mechanical seals
as well as operating data (application) and the CIP process data requirements. These data must
meet the equipment selection. Take into consideration that operating your pump under dierent
circumstances can void the warranty. Please keep the data sheet for any clarication.
KNOW YOUR PUMP

9
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Data Sheet
Data Sheet
Customer: Example
Model QTS 203 Operating Conditions VFD
Certication 3A / EHEDG Capacity 60 gpm
Screw material AISI 316L Di. pressure 50 psi
Housing material AISI 316L Pump speed 600 rpm 60 Hz
Shaft material 17-4 PH Temperature 30 °C
Screw hardening Yes Viscosity 500 cPs
Housing hardening Yes Particle size < 0.5 in
Rotation (Front) CW bhp 4.9 hp
Sealing Single mechanical seal Nominal power 7. 5 hp
Sealing material SiC/C
Elastomer material EPDM CIP
Suction port location Front cover port Max. pump speed 1800 rpm 90 Hz
Suction port size Tri-Clamp 2" Max. CIP time 30 min
Discharge port size Tri-Clamp 2" Max. di. pressure 50 psi
Thermal jacket No Piping size 2 in
Drive Electric motor with gear
reduction
VFD Yes
KNOW YOUR PUMP

10
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Pump General Assembly
The pump uses twin screw rotors, when rotating they move the uid through the casing. The
elements inside the gear case are responsible for transmitting the synchronized movement and
the force required for pumping the uid; gears, bearings, spacers, and shafts are inside the
gear case.
1. Front cover (with port connection,
typically inlet)
9
10
6
7
5
4
1
4. Pump casing
5. Back cover (with port connection,
usually outlet)
6. Gear case
7. Pump base plate (NEMA/IEC)
9. Drive shaft
10. Gear case cover
Pump Arrangements Assemblies
The QTS series pumps can be delivered coupled to a drive element in dierent ways to solve one
specic application. They can be ordered and delivered as follows:
Pump Only. In this case the pump is supplied
with a drive shaft for coupling, does not include
motor/gear-motor, coupling or base.
Pump Coupled to a Motor Assembled on a Base.
This assembly includes a motor with a coupling,
coupling guard and base.
KNOW YOUR PUMP

11
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Pump Coupled to a Gear-Motor Assembled on
a Base. This assembly includes a gear-motor with
a coupling, coupling guard and base.
QTS Rotors and Clearances
The design of QTS rotors (twin screws) in addition to the clearances kept with the casing, allow
pumping high viscosity uids without the risk of contact between them. The secret of the correct
operation of the pump it’s on the proper rotor synchronization. Please contact Q-Pumps to discuss
this topic.
Using Variable Frequency Drives
The use of variable frequency drives is useful for performing variable applications including the
CIP process using the same pump. By changing the speed of the motor the pump can increase or
decrease the ow to reach dierent points of operation.
If your equipment is supplied with a variable frequency drive it is as a result of an analysis of the
applications of the pump, please follow the data shown in the Data Sheet.
If you want to use a variable frequency drive after the analysis of the application of the pump,
please contact your distributor or directly to Q-Pumps to be advised about this case. Remember
that using your pump under dierent conditions than those explained in the Data Sheet may result
in damage to the equipment, personnel and even void your warranty.
KNOW YOUR PUMP

12
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
BASE ALIGNMENT
BASE ALIGNMENT
Pump / base assemblies are aligned in Q-Pumps factory prior to shipment. However assembles
must be checked prior operation to avoid any misalignment. Misalignment may cause unneces-
sary wear and shorten the life of the pump. You can notice misalignment with excess noise and
vibrations. To check and align the pump to its drive rst remove the coupling guard.
COUPLING GUARD
Proceed to verify the angular alignment by measuring the space between the couplings in both
vertical and horizontal direction. The measured space has to be equal at both sides of the coupling
use shims in the pump base or motor base if needed. Proceed to align the pump and drive para-
llel to the axis of rotation. Use a straight edge in both top and side of the couplings to guarantee
parallelism.
ANGULAR ALIGNMENT
PARALELL ALIGNMENT
TOP VIEW SIDE VIEW

13
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
PUMP OPERATION
Follow these steps for the proper operation of your pump before, during and after starting it
up. Remember that the correct operation of the pump ensures proper performance and long
service life. Failure to follow these recommendations could result in damage to the pump
voiding the warranty.
Starting Up Procedure
Before starting the equipment, ensure the following:
• Oil is on its level; otherwise ll the gear case until the oil lls the sight glass.
• Mechanical seals are not leaking. Double mechanical seals must be lubricated without
exception. The pump is able to run dry for a short period of time (not recommended).
Prevent dry starts to avoid damaging the mechanical seals.
• Jackets are properly connected and have adequate supply of heating or cooling
medium.
• The pump is cleaned and sterilized.
• The pump is primed with the uid to be pumped.
• In order to prevent cavitation, check the valves in the suction side are fully open.
• The valves on the discharge side are fully open to prevent overpressure inside the
pump.
• Security measures are taken at the discharge side of the pump to protect against
overpressure (open valves, corresponding jacketed piping, by-pass, and recirculation
or pressure relief valves).
• The manometers at the discharge are operational.
When starting the motor, check and adjust the operating speed according to the data sheet, after
the motor reaches the operation speed search for leaks.
Shutting Down Procedure
After shutting down the motor check the following:
• The pump slows softly. If a variable frequency drive is used both acceleration and
deceleration ramps can be programed.
• If the pump has double mechanical seal even when the pump is stopped keep the
supply of the buer uid until it is depressurized.
• If a jacket is used please adjust it until the pump temperature goes below a 100 °C/212 °F.
Restarting Procedure
Before restarting the pump check the smooth rotation of the shafts without restrictions and repeat
the starting up procedure.
PUMP OPERATION

14
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
MAINTENANCE: Pump Assembly and
Disassembly
To assemble and disassemble the pump, follow the recommendations described ahead.
Always use original spare parts and follow the instructions in this manual. Not following these
recommendations could result in damage to the equipment and void the warranty. Remember to
read the safety recommendations.
Tools and Spare Parts
Some spare parts such as mechanical seals, O-rings and gaskets kits may be required for solving
any contingency.
The following tools are provided within the pump:
1. Special wrench to tighten lock nut (gear case).
2. Hook for O–rings removal.
You may require these tools:
1. Set of ball end hexagonal L-keys in standard sizes: 3/16”, 1/4”, 5/16” and 3/8”.
2. Steel thicknesses gages in sizes of 0.001”, 0.002” and 0.005”.
3. Socket wrench and set of six points hexagonal sockets.
4. Wrenches 7/8”, 1” and 1 ½”.
5. It is very important to have a torque wrench (capacity from 4 to 50 lb·ft).
Also you may need FDA grade silicone base grease for incidental contact.
Oil and Oil Change
The pump comes with Food Grade Mineral Oil from fabric. All pump sizes use ISO VG-68 oil.
Oil change is needed if one of the following conditions is present:
First oil change 240 hours
Non-continuous operation* 2000 hours
Continuous operation** 2500 hours or 4 months (whichever comes rst)
* Twelve or more pump startups per day
** Less than twelve pump startups per day
MAINTENANCE

15
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
MAINTENANCE
lb·ft
lb-ft
lb-ft
lb-ft
lb-ft
lb-in
Bill of Materials
Please use this table and diagram to identify every component to be assembled.
Bill of Materials:
1Front cover 19 Synchronization ring 37 Front bearing
2Left rotor 20 Tapered driven ring 38 Rear bearing
3Right rotor 21 Cover nut 39 Lock washer
4Pump casing 22 Flat washer 40 Socket head cap screw
5Back cover 23 Spring washer 41 Drive gear
6Gear case 24 Set screw 42 Driven gear
7Pump base plate 25 Dowel pin 43 Bearing lock washer
8Driven shaft 26 O-ring 44 Bearing lock nut
9Drive shaft 27 Gasket 45 Lock washer
10 Gear case cover 28 Socket head cap screw 46 Socket head cap screw
11 Rotor nut 29 Front seal 47 O-ring
12 Mechanical seal 30 Flat washer 48 Pressure release valve
13 Button head set screw 31 Hexagon bolt 49 Rear seal
14 Stud 32 Eye bolt 50 Oil sight glass
15 Bearing spacer 33 Hexagonal bolt 51 Hex Plug
16 Gear spacer 34 Gear key 52 Plug
17 Retaining ange 35 Coupling key 53 Plug
18 Tapered drive ring 36 Lock ring 54 Nipple ush
Note: Depending on the model, some components may not be included.
Torque Values
Use the following torque table to tighten each item when indicated on the manual:
# Part Piece QTS 100 QTS 200 QTS 300
21 Front cover nuts 15 20 30
11 Rotor nut 35 40 50
40 Socket head cap screw (bearings) 10 15 20
44 Bearing lock nut 25 30 40
46 Socket head cap screw (sync ring) 2.1 4.2 6.25
25 50 75
Coupling set screws 10 lb·ft for all models.
Hexagonal bolts/hexagonal nuts motor/base, pump/base, 40 lb·ft.
Any other screw 10 lb·ft.
Minimum Thickness Gage
Model Value
100 0.007 in
200 0.007 in
300 0.010 in
Note: Value at both anks of rotor

16
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
1
4
2
12A-J
2X
3
6
8
9
15
2X
17
2X
10
41
42
18
46
6X
7
11
2X
5
14
4X
43
2X
21
4X
22
4X
26
2X
23
2X
24
2X
25
4X
27
2X
28
2X
29
2X
31
4X
30
4X
32
52
4X
33
4X
35
36
4X
37
2X
38
6X
39
12X
40
12X
19
45
6X
20
47
49
50
2X
51
2X
44
2X
16
34
13
8X
12K-T
2X
48
Exploded View
MAINTENANCE

17
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
MAINTENANCE
Be sure to read and understand the Safety section of this manual before servicing
your pump.
De-energize the unit and lock out the mechanism.
Handle all wet parts with caution; prevent harsh contact or scratches and always
place them on a clean surface to avoid damage.
The preventive maintenance procedures and inspection comprises the change of the mechanical
seals, O-rings and gaskets replacement, checking the oil level, checking the alignment of the
coupling as well as noise and vibration issues.
Removing the Rotors
1. Remove rst the cover nuts (21) and at washers (22), use a wrench or a six points female
socket. Remove the front cover (1).
2. Take o carefully the front cover gasket (27), you may use the O-rings hook.
3. Remove the pump housing (4) carefully. It is xed and centered over the back cover (5) using
dowel pins (25). Just pull out to slide the housing through the housing studs (14). The pins may
be pulled out along the housing or stay on the back cover. You can remove also the studs to
increase the working area. The plug (53) is just for sealing a drill on the housing which has not
a specic use.
Note: To remove the studs you may use the nut-and-locknut technique (see annex B).
27
1
22
21
5
14
25
4
53
4. Block the rotors with the aid of a wrench using the drive shaft (9) end. Using a six points female
socket loosen the rotor nuts (11). First loosen the left side rotor (2) nut torque, then change to the

18
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
right side rotor (3) and just loosen the torque of the second nut. Slowly loosen simultaneously the
two rotor nuts until both are out.
5. The objective to loosen both nuts slowly will allow taking the rotors out uniformly along the
shafts with no contact between each other.
3
11
9
2
6. Remove the O-rings (26), spring washers (23) and the rotor nut socket set screws (24). Sometimes
the socket set screws may remain installed on the shafts, to remove them use a hexagonal key.
7. Take o the gasket (27) placed on the back cover. Sometimes this gasket may get stuck to the
casing, pull out carefully to avoid damaging it whit the studs or rotors. Pull straight out both rotors
along the shafts.
27
24
23
26
8. You have nished the removal of the rotors procedure. Every time you replace the rotors be sure
to perform the synchronization procedure to guaranty the right assembly. Now continue with the
replacement of the mechanical seals.
MAINTENANCE

19
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Mechanical Seals Replacement
1. Here is a description of the procedures for inspection and replacement of the mechanical
seals. Every pump has two mechanical seals.
12J
12H
12G
12F
12E
12D
12C
12B
12A
12J
12H
12G
12F
12E
12D
12C
12B
12A
2. Single mechanical seal kit: it contains
components 12A to 12J.
3. Double mechanical seal kit: It contains all
components of the single mechanical seal
plus components 12K to 12T; in this case the
stainless steel seal housing (12J) is replaced
by the seal housing (12L) which is already
included on the double mechanical seal kit.
4. The mechanical seal should be installed
using your hands only. No special tools
are required unless it is indicated. You may
use a hook to take out the O-rings from
their grooves. Be careful not to scratch
the seal faces.
12F
12N
12A
12R
12T
12S
12Q
12P
12M
12L
12K
12H
12G
12E
12D
12C
12B
12F
12N
12A
12R
12T
12S
12Q
12P
12M
12L
12K
12H
12G
12E
12D
12C
12B
5. Look for defects on the sealing surfaces such as scratches or wear. If a replacement is necessary,
it is recommended to change all components to ensure proper operation. If an O-rings is deformed
or damaged it is recommended also to replace the entire set of O-rings.
MAINTENANCE

20
Operation and Maintenance Manual
QTS Series Twin Screw Positive Displacement Pump
QTS-M04
Uninstalling the Single Mechanical Seals
1. Remove with your hands the stainless steel rotary holder subassembly (12B-F) by grabbing and
pulling out from the rotating face (12F). When pulling, the static face (12G) might come along.
2. To inspect the O-rings inside, remove the rotating face pulling gently out the rotary holder; inside
are the springs (12C) and the O-ring (12D), be careful because the springs are loose. Finally remove
the O-ring (12E) which is on the rotary holder groove.
3. Remove the O-ring (12A) housed in the rotary holder on the front groove. Sometimes O-rings
can be loose out of their grooves and get stuck to other components. This is normal.
4. On the back cover (5) pull out the static face (12G) and the O-ring (12H). Avoid any harsh contact
on the sealing faces.
5. To remove the seal housing (12J) it is necessary to remove the back cover of the pump.
6. Loosen the hexagonal socket head cap screws (28) that x the back cover to the gear case (6)
and extract it through the studs (14). The back cover is centered with dowel pins (25), this pins can
go out along with the back cover or can stay in the gear case as well.
7. Loosen the hexagonal socket head cap screws (13) on the back of the cover to eject the seal
housing. Push with your thumbs from the front of the back cover. Be careful when removing the
seal housing to avoid any harsh contact. This step is not necesary if only a seal replacement is
needed
8. Repeat these steps to disassemble the other mechanical seal.
28
12A
6
25
12H
12G
12B-F
28
12A
6
25
12H
12G
12B-F
12J
13
MAINTENANCE