Flowserve Limitorque QX Guide

Experience In Motion
Maintenance
and Spare Parts
Limitorque QX
Electronic Actuator
FCD LMENIM3314-01 - 06/18

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
2
Contents
1 Introduction 7
1.1 Premise 7
1.2 Procedure Emphasis 7
1.3 Important Notes and Warning Statement 8
1.4 Reference Documents 8
1.5 This Document Applies to both QX – 90˚ Actuators and All QXM-Multi-Turn Actuators 8
2 QX Actuator Subassembly 9
2.1 QX Actuator Subassembly Components 10
2.1.1 Product Description 10
2.1.2 Storage 10
2.1.3 Unit Weights 11
2.2 Product Idenitification 11
2.2.1 Initial Inspection and Recording Suggestions 11
2.3 Maintenance 12
2.3.1 Recommended Maintenance 12
2.3.2 Unit Lubrication 12
2.3.3 O-Ring Lubrication 13
2.4 Subassembly Removal and Remounting Procedures 13
2.5 How to Order Replacement Subassemblies 13
2.5.1 Replacement Parts 13
2.5.2 Returning Procedure 14
2.5 Screw Preload (Torque) 14
3 Remove Actuator from Mounting Adapter 15
3.1 Actuator Removal with Type B4/B4E Base (Torque) 15
3.1.1 Removal (Type B4/B4E Base) 15
3.2 Actuator Removal with Type A1/A1E Base (Thrust)–QXM only 17
3.2.1 Optional Thrust Base Assembly QX-1 & 2 17
3.2.2 Optional Thrust Base Assembly Removal 17
3.2.3 Thrust Base Remounting 18
3.2.4 Removal (Type A1/A1E Base) Actuator Removal Separate from Thrust Base 19
3.2.5 Remounting(Type A1/A1E Base)Actuator Remounting Separate from Thrust Base19
3.2.6 Removal (Type A1/A1E Base) Actuator and Thrust Base as a Unit 20
3.2.7 Remounting (Type A1/A1E Base) Actuator and Thrust Base as a Unit 20
4 Mechanical Assemblies 21
4.1 Motor Subassembly. QX-1 thru 5 21
4.1.1 Motor Subassembly Removal. QX-1 thru 5 22
4.1.2 Motor Subassembly Remounting. QX-1 thru 5 23
4.2 Handwheel Cover Subassembly, QX-1 thru 5 24
4.2.1 Handwheel Cover Subassembly Removal, QX-1 thru 5 24
4.2.2 Handwheel Cover Assembly Remounting 27
4.3 Motor Cartridge Subassembly, QX-1 thru 5 27
4.3.1 Motor Cartridge Subassembly Removal, QX-1 thru 5 27
4.3.2 Motor Cartridge Assembly Remounting 28
4.4 Gearing and Clutching 29
4.4.1 Gearing and Clutching Removal 31
4.4.2 Gearing and Clutching Remounting 33
4.5 Pipe Plug 35
4.6 Baseplate 35
4.6.1 Baseplate Removal 35
4.6.2 Baseplate Remounting 37
4.7 Worm Shaft Assembly 37

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4.7.1 Worm Shaft Assembly Removal 38
4.7.2 Worm Shaft Assembly Replacement 38
4.8 Drive Sleeve, Stops and Encoder Shaft Assemblies 41
4.8.1 Drive Sleeve, Mechanical Stops, Encoder Shaft Removal 41
4.8.2 Drive Sleeve, Mechanical Stops and Encoder Shaft Assembly Remounting 42
4.9 Optional Baseplate Assembly, F/FA-05 & -07 QX-1 & 2, F/FA-10 QX-3 thru 5 43
4.9.1 Optional Baseplate Removal 43
4.9.2 Optional Baseplate Remounting 43
4.10 Torque Nut 44
4.10.1 Optional Small Baseplate Removal 45
4.10.2 Optional Small Baseplate Remounting 45
4.11 Optional Thrust Base Assembly QX-1 & 2 45
4.11.1 Optional Thrust Base Assembly Removal 46
4.11.2 Thrust Base Remounting 47
5 Encoder Assemblies 48
5.1 Encoder 90 Degree Unit Removal. QX-1 thru 5 48
5.1.1 90 Degree Encoder Removal 48
5.1.2 90 Degree Encoder Remounting 49
5.2 Multi Turn Encoder. QXM-1 thru 5, All RPMs 50
5.2.1 Multi Turn Encoder Removal 50
5.2.3 Multi Turn Encoder Remounting 52
6 Electronic Assemblies 54
6.1 Terminal Cover 54
6.1.1 Terminal Cover Removal 54
6.1.2 Terminal Cover Remounting 55
6.2 Controls Cover 55
6.2.1 Controls Cover Removal 56
6.2.2 Controls Cover Subassembly Remounting 57
6.3 Control Modules 58
6.3.1 Control Module Removal 58
6.3.2 Control Module Subassemblies 58
6.3.3 Control Module Remounting 61
6.4 Terminal Block 61
6.4.1 Terminal Block Shield 62
6.4.2 Terminal Block Removal 62
6.5 Mounting of Standard and Optional Controls 62
6.5.1 Installation 62
6.5.2 Removal 67
6.6 Optional Transformer 67
6.6.1 Optional Transformer Removal 68
6.6.2 Optional Transformer Remounting 69
7 Electronic Wiring (Cabling) 70
7.1 AC Low Voltage Wiring (cabling) Quick Reference Guide for Control Module and
Main Board. (Less than 250 VAC) 70
7.1.1 AC Low Voltage Module (Version 1) 70
7.1.2 AC Low Voltage Module (Version 2) 71
7.1.3 DC Board Wiring (24 – 48 VDC) 71
7.2 High Voltage Wiring (cabling) Quick Reference Guide. (Greater than 250 VAC) 71
7.2.1 High Voltage Module 71
7.3 Optional Transformer Wiring (cabling) Quick Reference Guide 72
7.3.1 Optional Transformer Harness Wiring Used With Low Voltage Control Module 73
7.3.2 Optional Transformer Harness Wiring Used With High Voltage Control Module 73
7.3.3 Optional Transformer Harness Routing Used With High Voltage Control Module 73
7.4 Terminal Block Wiring Harness Numbers 74

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8 Spares and Replacement Parts 75
8.1 Guidelines for Recommended Spare Parts 75
8.1.1 Wear Components 75
8.1.2 Bearings, O-rings, and Seals 75
8.1.3 Critical Components 75
8.2 Recommended Spare Parts for QX Actuators 76
8.2.1 Commissioning and Startup 76
8.2.2 Short-Term Duty 76
8.2.3 Long-Term Duty 76
8.2.4 Severe Duty 76
8.3 Other Concerns 77
9 Regulatory Information 78
9.1 Declaration of Conformity 78
9.2 Specific Conditions for Use — Atex/Cenelec/IECEx Applications 80
9.3 Statement of Compliance with Applicable European Directives 80
Figures
Figure 2.1 Typical QX Actuator 7
Figure 2.2 QX Nameplate 11
Figure 2.3 QX Nameplate 11
Figure 2.4 QX Oil fill /Plug Locations (QX-1 thru 5) 13
Figure 3.1 Torque Nut, F/FA-10, QX-1 & 2 and F/FA-12 and -14, QX-1 thru 5 15
Figure 3.2 Torque Nut, F/FA-05 and -07, QX-1& 2 and F/FA-10, QX-1 thru 5 16
Figure 3.3 Optional Thrust Base Assembly 17
Figure 3.4 Optional Thrust Base Subassembly 18
Figure 4.1 Motor Cover and Motor Subassembly Removal 21
Figure 4.2 Motor Subassembly, Item11 22
Figure 4.3 Motor Bracket Orientation View 23
Figure 4.4 Handwheel Cover Assembly 24
Figure 4.5 Handwheel Cover Subassembly, Item 10. QX-1 & 2 25
Figure 4.6 Handwheel Cover Subassembly, Item 10. QX-3 thru 5 26
Figure 4.7 Handwheel Subassembly, Item 10-4. QX-1 & 2 shown 26
Figure 4.8 Motor Cartridge Assembly Removal 27
Figure 4.9 Motor Cartridge Subassembly, Item 5 28
Figure 4.10 Gearing and clutching, QX-1 & 2 29
Figure 4.11 Gearing and clutching, QX-3 thru 5 30
Figure 4.12 Clutch Shaft Subassembly, Item 6. QX-1 & 2 32
Figure 4.13 Clutch Shaft Subassembly, Item 6. QX-3 thru 5 32
Figure 4.14 Clutch Shaft Subassembly, Item 7 33
Figure 4.15 Clutch Fork Shaft Remounting 34
Figure 4.16 Declutch Spring Assembly View. QX-1 & 2 shown 34
Figure 4.17 Pipe Plug 35
Figure 4.18 Baseplate, F/FA-10 QX-1 & 2, F/FA-12 & 14, QX-3 thru 5 36
Figure 4.19 F/FA-10 QX-1 & 2, F/FA-12 & 14, QX-3 thru 5 Baseplate Subassembly, Item 3 36
Figure 4.20 Worm Shaft 38
Figure 4.21 Drive Sleeve, Stops, and Encoder Shaft Assembly 40
Figure 4.22 Multi-turn Encoder Shaft Subassembly (Item 1-6) 41
Figure 4.23 Stop Groove View 42
Figure 4.24 F/FA-05 / 07, QX-1 & 2 or F/FA-10, QX-3 thru 5 Optional Baseplate 43
Figure 4.25 Torque nut, F/FA-10, QX-1 & 2 and F/FA-12 and -14, QX-1 thru 5 44
Figure 4.26 Torque nut, F/FA-05 and -07, QX-1 & 2 and F/FA-10, QX-1 thru 5 44
Figure 4.27 Optional Thrust Base Assembly QXM Only 45

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Figure 4.28 Optional Thrust Base Subassembly 46
Figure 5.1 90º Encoder Assembly 48
Figure 5.2 Encoder To Subassembly, Item 14-1 49
Figure 5.3 Encoder To Unit Assembly View 49
Figure 5.4 Multi-turn Encoder Assembly 50
Figure 5.5 6.5-Turn Spur Gear Subassembly (Item 17-2) 51
Figure 5.6 20-Turn Spur Gear Subassembly (Item 17-2) 52
Figure 5.7 20-Turn Gear Slot Orientation View 52
Figure 6.1 Terminal Cover Assembly 54
Figure 6.2 Terminal Cover Subassembly 55
Figure 6.3 Controls Cover Assembly 56
Figure 6.4 Controls Cover Subassembly 57
Figure 6.5 Control Module Assembly 58
Figure 6.6 Low Voltage (Less than 250 VAC) Control Module Subassembly 59
Figure 6.7 High Voltage (Greater than 250 VAC) Control Module Subassembly 59
Figure 6.8 DCV Control Module Subassembly 60
Figure 6.9 Bracket Connector Retainer Assembly 61
Figure 6.10 Terminal Block Assembly 62
Figure 6.11 Terminal Block Shield 62
Figure 6.12 Quik Power Without Option Boards 64
Figure 6.13 Quik Power With Option Boards 65
Figure 6.14 Option Board Assembly 66
Figure 6.15 Optional Transformer Assembly 67
Figure 6.16 Optional Transformer Subassembly 68
Figure 7.1 Low Voltage QX Unit Wiring Connections 70
Figure 7.2 Low Voltage QX Unit Wiring Connections (Version 2) 71
Figure 7.3 DC QX Unit Wiring Connections 71
Figure 7.4 High Voltage QX Unit Wiring 72
Figure 7.5 Typical Toroid Transformer Label 72
Figure 7.6 Optional Low Voltage Transformer Harness Wiring 73
Figure 7.7 Optional High Voltage Transformer Harness Wiring 73
Figure 7.8 High Voltage Optional Transformer Harness Assembly Routing 73
Figure 7.9 Optional Transformer Harness Connector to Wire Position per Supply Voltage 74
Figure 7.10 Terminal Block Wiring Harness And Connector Numbers 74
Tables
Table 2.1 Typical QX Actuator Subassembly 10
Table 2.2 QX Unit Weights 11
Table 2.3 QX-1 thru 5 Oil Capacities 12
Table 2.4 Screw Preload Torque 14
Table 3.1 Torque Nut, F/FA-05 and -07, QX-1 & 2 and F/FA-10, QX-1 thru 5 16
Table 3.2 Optional Thrust Base Assembly 17
Table 3.3 Optional Thrust Base Subassembly 18
Table 4.1 Motor Parts List 21
Table 4.2 Motor Subassembly, Item 11 22
Table 4.3 Handwheel Cover Assembly 24
Table 4.4 Handwheel Cover Subassembly Item 10. QX -1 & 2 25
Table 4.5 Handwheel Cover Subassembly, Item 10. QX-3 thru 5 25
Table 4.6 Handwheel Subassembly, Item 10-4 26
Table 4.7 Motor Cartridge Assembly Removal 27l
Table 4.8 Motor Cartridge Subassembly, Item 5 28
Table 4.9 Gearing and Clutching, QX-1 & 2 29

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Table 4.10 Gearing and Clutching, QX-3 thru 5 30
Table 4.11 Clutch Shaft Subassembly, Item 6. QX-1 & 2 31
Table 4.12 Clutch Shaft Subassembly Item 6. QX-3 Thru 5 32
Table 4.13 Clutch Shaft Subassembly Item 7 33
Table 4.14 Pipe Plug 35
Table 4.15 Baseplate F/FA-10 QX-1 & 2, F/FA-12 & 14 QX-3 thru 5 36
Table 4.16 Baseplate Subassembly Item 3 36
Table 4.17 Worm Shaft Parts List 37
Table 4.18 Drive Sleeve, Stops, and Encoder Shaft Assembly 40
Table 4.19 Multi-turn Encoder Shaft Subassembly (Item 1-6) 41
Table 4.20 Optional Baseplate Removal 43
Table 4.21 Torque nut, F/FA-10, QX-1 & 2 and F/FA-12 and -14, QX-1 thru 5 44
Table 4.22 Torque nut F/FA-05 and -07 QX-1 & 2 and F/FA-10, QX-1 thru 5 44
Table 4.23 Optional Thrust Base Assembly 45
Table 4.24 Optional Thrust Base Subassembly 46
Table 5.1 90º Encoder Assembly 48
Table 5.2 Encoder Subassembly, Item 14-1 49
Table 5.3 Multi-Turn Encoder Assembly 50
Table 5.4 6.5-Turn Spur Gear Subassembly (Item 17-2) 51
Table 5.5 20-Turn Spur Gear Subassembly (Item 17-2) 51
Table 6.1 Terminal Cover Assembly 54
Table 6.2 Terminal Cover Subassembly 55
Table 6.3 Controls Cover Assembly 55
Table 6.4 Controls Cover Subassembly 56
Table 6.5 Control Module Assembly 57
Table 6.6 Low Voltage (Less than 250 VAC) Control Module Subassembly 58
Table 6.7 High Voltage (Greater than 250 VAC) Control Module Subassembly 59
Table 6.8 DCV Control Module Subassembly 60
Table 6.9 Terminal Block Assembly 61
Table 6.10 Control Board Connectors 66
Table 6.11 Screw Part Numbers 67
Table 6.12 Optional Transformer Assembly 67
Table 6.13 Optional Transformer Subassembly 68
Table 7.1 Connector to Wire Position per Supply Voltage 74

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Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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1 Introduction
1.1 Premise
The Flowserve Limitorque QX actuator components are separated into subassembly groupings. This manual covers
the removal and remounting procedures for each subassembly group. Use these instructions when disassembly is
required for service, maintenance or parts replacement.
1.2 Procedure Emphasis
Please refer to the following methods used to emphasize text throughout this manual. Safety Warnings, Cautions and
Notes present material that is important to user safety. Be sure to read any safety notices you see as they could prevent
equipment damage, personal injury or even death to you or a co-worker.
Safety notices are presented in this manual in three forms:

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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c WARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning notices
could result in personal injury or death.
a CAUTION: Directs the user’s attention to general precautions that, if not followed, could result in personal injury
and/or equipment damage.
NOTE: Highlights information critical to the user’s understanding of the procedure.
Bold text stresses attention to the details of the procedure.
1.3 Important Notes and Warning Statements
Please read this Maintenance and Spare Parts Manual carefully and completely before attempting to store or perform
maintenance on your QX valve actuator. Further installation, setup and operation instructions are available in the
Installation and Operation manual (LMENIM3306) attached to the actuator declutch lever bracket at shipment.
cWARNING: Be aware of electrical hazards within the actuator and high-pressure hazards of the attached valve
or other actuated device when installing or performing maintenance on your QX actuator. Failure to observe
these precautions could result in serious bodily injury, damage to the equipment or operational difficulty.
cWARNING: Do not manually operate actuator with devices other than installed handwheel and declutch lever.
Using additive force devices (cheater bars, wheel wrenches, pipe wrenches or other devices of this nature)
on the actuator handwheel or declutch lever may cause serious personal injury and/or damage to the actuator
or valve.
1.4 Reference Documents
• Protection, Control and Monitoring features of MX/QX Electric Actuators (Bulletin LMENTB2300)
• QX Control, Performance and Value in Quarter-turn Electric Valve Actuators (Bulletin LMENBR3302)
• QX Installation Manual (Bulletin LMENIM3306)
• QX Quick Mount and Start (Bulletin LMENIM3313)
1.5 This document applies to both QX – 90 degree actuators and all
QXM-multi-turn actuators.
The latest revisions to these documents are available on-line from Flowserve Limitorque’s website, www.flowserve.
com or at www.limitorque.com

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Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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2 QX Actuator Subassembly
Figure 2.1 - Typical QX Actuator
NOTE: QX-1 and 2 90° unit shown.
11 5
6
7
10
15-3
14-4
14-1
3
10-4
14-8
11 5
6
7
10
15-3
14-4
14-1
3
10-4
14-8
11 14-1
5
6
7
10
10-4
15-3
14-8
3
14-4

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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2.1 QX Actuator Subassembly Components
Table 2.1 - Typical QX Actuator Subassembly
Item Number Description
3Baseplate
5Motor cartridge
6Clutch shaft
7Clutch fork
10 Handwheel cover
10-4 Handwheel
11 Motor
14-1 Encoder
14-4 Terminal block
14-8 Power controls
15-3 Controls cover
2.1.1 Product Description
Your QX actuator controls the opening and closing travel of valves and other actuated devices. OPEN and CLOSED
limits are protected by an absolute encoder that provides optical sensing of valve position and measures valve position
in both motor and handwheel operation. No battery or backup power supply is required. Output torque is derived
from current, voltage and temperature. If the preset torque is exceeded, the motor shuts off. As a result of this reliable
and advanced protection technology, all valve and other actuated devices are protected from potential damage from
overload, improper seating and foreign obstructions.
A range of control and network options is available which can be easily added to the control capabilities already
available on a standard actuator. Contact your local Limitorque distributor or Limitorque sales office for further
information.
2.1.2 Storage
Storage Recommendations
Your QX actuator is double-sealed and weather-proof as shipped, even for explosion-proof applications, providing
all compartment covers and cable entry plugs are left intact. Actuators should be stored in a clean, dry, protected
warehouse until ready for installation. If actuators must be stored outdoors, they should be stored off the ground and
high enough to prevent being immersed in water or buried in snow.
Preferred Storage Orientation
Your QX actuator should be stored with terminal compartment in the vertical position and the drive base down to
obtain optimum service life.

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2.1.3 Unit Weights
Table 2.2 - QX Unit Weights
Unit lb. kg
QX-1 40 18
QX-2 42 19
QX-3 80 36
QX-4 80 36
QX-5 80 36
NOTE: Weights include B4 stem nut and lubricant.
2.2 Product Identification
2.2.1 Initial Inspection and Recording Suggestions
Upon receipt of the actuator, several steps should be initially followed to ensure condition of equipment and to
establish proper record keeping.
1. After removing the actuator from the shipping carton or skid, thoroughly examine it for any physical damage
which may have occurred during shipment. If you note any damage, immediately report the damage to the
transport company and call Limitorque for further assistance.
2. A nameplate with important information is attached to each actuator. Record the following information for use
when you need to contact Limitorque with any questions about your actuator:
• Unit type/size
• Flowserve Limitorque order number
• Serial number
Figure 2.2 - QX Nameplate Figure 2.3 - QX Nameplate
SEE LINE EXAMPLES VIEWS
'PART TURN' AND 'MULTI TURN'.
EXAMPLE
PART TURN
PART TURN LINE
EXAMPLE
EXAMPLE
MULTI TURN
MULTI TURN LINE
EXAMPLE

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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2.3 Maintenance
2.3.1 Recommended Maintenance
Under normal operating conditions, the QX is a maintenance-free actuator. Therefore, for normal applications, the
actuator will require no formal maintenance program. However, if the actuator is used under severe service conditions
or operated in a Hazardous Location, the following maintenance procedures are required:
1. Check the oil level every 50 hours of operation at a minimum. Where conditions are severe due to frequent
operation or high ambient temperatures, a more regular inspection interval should be maintained.
2. Change the gear oil every 100 hours of operation. See section 2.3.2 Unit Lubrication.
3. All ball bearings, oil seals, O-rings and quad-rings are to be replaced after 450 hours of operation. See sections
2-3-2 thru 2-3-3.
Clean and lubricate the valve stem regularly to avoid torque build-up and wear due to silting and corrosion. Infrequent
operation can lead to corrosion and contamination of the valve stem thread lubricant. Check any thrust bearings that
are fitted to the actuator for proper lubrication at regular intervals.
2.3.2 Unit Lubrication
Change oil every 100 hours of operation or if water or other foreign material is found during oil inspection.
Oil Level Inspection and Fill Criteria
To avoid pressurization of the gearcase, the following recommended oil capacities should not be exceeded: (Reference
Table 2.3 for oil capacities when mounted in varying positions)
• Actuator viewed in upright position (terminal compartment up / base down) Oil level should be approximately 1
inch (25.4 mm) below the outer surface of the housing at the oil fill port.
• Actuators mounted in other orientations than the upright position should have their oil capacities maintained.
Fill through the highest oil fill port until the oil is at a level that will contact the bottom of the plug when installed in the
oil fill port.
NOTE: Do not overfill! Oil will expand during actuator operation. Actuators are shipped with an oil volume suitable for
any mounting position. When checking the factory-supplied oil level, excess oil may drain from the highest oil fill port
due to the various mounting orientations of each application.
Table 2.3 QX-1 thru 5 Oil Capacities
Unit Description Fluid Ounces Litres
QX 1/2 26 0.77
QX 3/4/5 80 2.36
Lubrication Data
Oil Specification – all models
-30°C to +70°C (-22o to + 158o F) units require oil per Petro-Canada SHB-68 or Mobil SHC626
-60°C to +40°C (-76o to + 104o F) units require oil that is 50% Petro Canada SHB-68 with 50% Soltex PAO4

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Figure 2.4 - QX Oil fill /Plug Locations (QX-1 thru 5)
2.3.3 O-Ring and Lubrication
O-rings and seals should be replaced any time an actuator is disassembled. Lubricate with a substance that is
compatible with Buna N seals.
2.4 Subassembly Removal and Remounting Procedures
This manual divides each QX actuator subassembly into a Removal and Remounting procedure. Use the following
procedures to remove subassemblies for inspection, repair or replacement. Some subassemblies require prior
subassembly removal before allowing the desired subassembly removal. Note the First Remove instructions at
the beginning of each subassembly removal procedure. Remove these subassemblies first, and then remove the
desired subassembly according to the instructions. Once removed, evaluate subassembly components to determine
requirement for a new subassembly. If a new subassembly is required, see Section 2.5. Once components have been
identified and replaced, remount following the appropriate Remounting procedures.
2.5 How to Order Replacement Subassemblies
2.5.1 Replacement Parts
Replacement parts are sold in modular subassemblies; therefore, when part replacement is required, order parts at the
subassembly levels as shown in this manual. Parts may be ordered from your local Limitorque representative (www.
flowserve.com) or direct from the factory:
Telephone: [phone]
Fax: [phone]
Please have the following information, found on the actuator nameplate, available to help us facilitate your order:
• Unit type/size
• Limitorque order number
• Serial number
OIL PLUG
TOP OF UNIT
OIL PLUG
BOTTOM OF UNIT
OIL PLUG
BOTTOM OF UNIT,
DRIVE SLEEVE AREA
OIL PLUG
TOP OF UNIT
OIL PLUG
BOTTOM OF UNIT
OIL PLUG
BOTTOM OF UNIT,
DRIVE SLEEVE AREA
Oil plug
top of unit
Oil plug
bottom of unit
Oil plug
Bottom of unit,
Drive sleeve area

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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2.5.2 Return Procedure
When parts are identified for warranty or other component replacement, a Return Material Authorization (RMA) must
be obtained from Flowserve. Contact factory for a RMA number (see contact information in section 2.5.1). All returned
parts must be accompanied by documentation with the following information to obtain credit for returned goods:
• Return Material Authorization (RMA)
• Unit type/size
• Flowserve Limitorque order number
• Serial number
Return parts to the address listed below:
Limitorque Actuation Systems
5114 Woodall Road
Lynchburg, VA 24502
2.5 Screw Preload (Torque)
Torque applied to each size screw used in the QX:
Table 2.4 - Screw Preload Torque
Screw Screw Preload
M10 10-12 ft-lbs
M10 used on Base Plate
QX-3 / 4 / 5 17-20 ft-lbs
M8 6-8 ft-lbs
M6 24-36 inch lbs
M5 15-20 inch lbs
M4 8-12 inch lbs
M3 60-70 inch ounces
M2 18-22 inch ounces

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3 Remove Actuator from
Mounting Adapter
3.1 Actuator Removal with Type B4/B4E Base (Torque)
3.1.1 Removal (Type B4/B4E Base)
Step 1
cWARNING: Hazardous Voltage! Turn off all power sources to actuator before removing actuator from mounting
plate. Power sources may include main power or control power. If necessary, disconnect incoming power leads
L1, L2, L3, and control wiring from the terminal block.
Figure 3.1 - Torque Nut, F/FA-10, QX-1 & 2 and F/FA-12 and -14, QX-1 thru 5
13-7
13-6
13-6
13-7

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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Table 3.1 Torque Nut, F/FA-05 and -07, QX-1 & 2 and F/FA-10, QX-1 thru 5
ITEM NUMBER DESCRIPTION QTY.
13-7 SCOKET HEAD CAP SCREW 1
16-7 TORQUE NUT 1
Figure 3.2 - Torque Nut, F/FA-05 and -07, QX-1& 2 and F/FA-10, QX-1 thru 5
Remove the bolts that secure the actuator to the mounting adapter. If type B4 or B4E base is used in addition to the
standard type B4 or B4E baseplate, you may leave the B4 base attached to the mounting adapter and remove the
actuator only. Or if required, you may remove the bolts that mount type B4 base to mounting adapter. This will allow
actuator removal along with optional B4 base.
Step 2
cWARNING: Potential high-pressure vessel! Before disassembling your actuator, ensure that the valve or other
actuated device is isolated and is not under pressure.
Lift the actuator from mounting adapter.
3.1.2 Remounting (Type B4/B4E Base)
Step 3
Ensure stem nut (#1-22) is secured inside actuator drive sleeve with retaining ring (#1-23). Lower the actuator onto
the mating component, making sure to align stem nut key and keyway with mating component.
Step 4
Ensure that the actuator and mounting adapter flange mating holes are aligned correctly.
Sept 5
cWARNING: Hazardous Voltage! Turn off all power sources before rewiring incoming power leads L1, L2, L3,
and control wiring in the terminal block.
Secure the actuator to the mounting adapter with mounting bolts.
13-7
16-1
16-1
13-7

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Step 6
Reconnect incoming power leads L1, L2, L3, and control wiring to the terminal block. Restore power source when
ready for operation.
3.2 Actuator Removal with Type A1/A1E Base (Thrust) – QXM only
3.2.1 Optional Thrust Base Assembly QX-1 & 2
Table 3.2 - Optional Thrust Base Assembly
ITEM NUMBER DESCRIPTION QTY.
16-10 TORQUE NUT 1
16-11 BUSHING 1
16-12 O'-RING 1
16-13 O'-RING 1
16-14 ADAPTER PLATE 1
16-15 SOCKET HEAD CAP SCREWS 4
16-16 SPACER, PILOT, ISO ONLY 1
16-17 THRUST BASE ASSEMBLY 1
Figure 3.3 - Optional Thrust Base Assembly
3.2.2 Optional thrust base assembly removal.
Step 1
Remove the four (4) screws (# ) and remove the thrust base subassembly (#16-17) by sliding the base down. If base
is ISO remove the spacer (pilot) (#16-16).
Step 2
Remove the four (4) screws (# 16-15) and remove the adapter plate (#16-14) and torque nut (#16-10). Item (#16-11)
bushing is pressed into adapter plate and cannot be removed. The torque nut is held in place by the unit drive sleeve
and the bushing (#16-11).
16-10
16-12
16-11
16-13
16-14
16-16
ISO THRUST BASE ONLY
16-15
16-17
SOC HD CAP SCREWS
ARE PART OF THRUST
BASE SUBASSEMBLY
16-10
Soc hd cap screws
are part of thrust
base subassembly
16-11
16-14
15-15
16-12
16-13
16-16
16-17
ISO thrust base only

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
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Table 3.3 - Optional Thrust Base Subassembly
ITEM NUMBER DESCRIPTION QTY.
10-1 HOUSING, THRUST BASE 1
10-2 PILOT, THRUST BASE 1
10-3 THRUST NUT 1
10-6 SOCKET HEAD CAP SCREWS 1
10-7 FLAT WASHER 1
10-8 RELIEF FITTING 1
10-10 SOCKET HEAD CAP SCREWS 4
10-11 GREASE FITTING 1
10-12 NEEDLE BEARING 2
10-13 THRUST RACE 2
10-14 QUAD RING 1
10-15 O'-RING 1
10-16 QUAD RING 1
Figure 3.4 - Optional Thrust Base Subassembly
3.2.3 Thrust base remounting
Step 1
Place QX torque nut (#16-10) into unit drive sleeve (#1-11) aligning nut lugs to drive sleeve slots.
Step 2
Lightly lubricate ‘O’-rings (#16-12) and (#16-13) and insert into bushing (#16-11) that is pressed into adapter plate
(#16-14). Slide adapter plate and bushing over end of torque nut and aligning to unit baseplate. Insert screws (#16-15)
into adapter plate holes and tighten.
Step 3
Align thrust base subassembly nut lugs (#10-3) with QX torque nut (#16-10) slots and slide thrust base on to QX
unit baseplate aligning pilots. Note; For ISO thrust base pilot spacer (#16-16) must be used to align thrust base to QX
baseplate. Insert screws (#10-10) into thrust base holes and tighten
10-14
10-11
10-1
10-8
10-13
10-13
10-12
10-12
10-3
10-15
10-16
10-710-6
10-10
10-2
10-6 10-7 10-16
10-10
10-2
10-15
10-12
10-13
10-11 10-14
10-13
10-1
10-8
10-3
10-12

19
Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
flowserve.com
NOTE: Two procedure options are available for removing the actuator and the thrust base:
1. Remove actuator from the thrust base, leaving the base mounted to the mounting flange or removing the thrust
base separately
2. Remove actuator and thrust base as a unit from the mounting flange.
3.2.4 Removal (Type A1/A1E Base) Actuator Removal Separate from Thrust Base
STEP 1
cWARNING: Hazardous Voltage! Turn off all power sources to actuator before removing actuator from mounting
plate. Power sources may include main power or control power. If necessary, disconnect incoming power leads
L1, L2, L3, and control wiring from the terminal block.
Remove the bolts (#10-10) that secure the actuator to the thrust base assembly (#10).
STEP 2
cWARNING: Potential high-pressure vessel! Before disassembling your actuator, ensure that the valve or other
actuated device is isolated and is not under pressure.
Lift actuator from thrust base assembly (#10).
STEP 3
cWARNING: Potential for actuated device to change position! The thrust base will maintain position only if non-
backdriving thread lead is used. Ensure proper thread lead is used in your application before allowing thrust
base to be used for main- taining position when actuator is removed.
Thrust base removal (if required)
The valve position will be maintained if a locking thread lead is used on the valve stem. If thrust base removal is
required, use the following removal procedure.
Remove the bolts that secure the thrust base to the mounting adapter.
STEP 4
Rotate the thrust base (#10) until it feeds off the threaded stem.
3.2.5 Remounting (Type A1/A1E Base) Actuator Remounting Separate from Thrust Base
STEP 5
Thrust base remounting (if required)
Ensure the thrust base stem nut has the two lugs positioned upward to engage with the drive sleeve slots when
actuator is reinstalled onto thrust base. Thread thrust base back onto mounting adapter.
STEP 6
Secure thrust base to mounting adapter with mounting bolts.
STEP 7
Actuator remounting
Lower the actuator onto the thrust base, making sure thrust nut lugs align and properly engage with drive sleeve slots.
STEP 8
Install bolts (#10-10) to secure the actuator to the thrust base assembly (#10).

Limitorque QX Electronic Actuator FCD LMENIM3314-01 – 06/18
20
STEP 9
cWARNING: Hazardous Voltage! Turn off all power sources before rewiring incoming power leads L1, L2, L3,
and control wiring in the terminal block.
Reconnect incoming power leads L1, L2, L3, and control wiring to the terminal block. Restore power source when
ready for operation.
3.2.6 Removal (Type A1/A1E Base) Actuator and Thrust Base as a Unit
STEP 1
cWARNING: Hazardous Voltage! Turn off all power sources to actuator before removing actuator from mounting
plate. Power sources may include main power or control power. If necessary, disconnect incoming power leads
L1, L2, L3, and control wiring from the terminal block.
Actuator and thrust base removal
Remove the bolts that secure the actuator and thrust base (#10) to the mounting adapter.
STEP 2
cWARNING: Potential high-pressure vessel! Before disassembling your actuator, ensure that the valve or other
actuated device is isolated and is not under pressure.
Declutch the actuator to manual mode.
STEP 3
Rotate the handwheel until the actuator lifts off the threaded stem.
3.2.7 Remounting (Type A1/A1E Base) Actuator and Thrust Base as a Unit
STEP 4
Actuator and thrust base remounting
Declutch the actuator to manual mode. Lift actuator up to the threaded stem and carefully align threads with thrust
base threaded stem nut.
STEP 5
Rotate the handwheel to lower the actuator along the threaded stem and onto the mounting adapter plate.
STEP 6
Install the mounting bolts to secure the actuator and thrust base (#10) to the mounting adapter.
STEP 7
cWARNING: Hazardous Voltage! Turn off all power sources before rewiring incoming power leads L1, L2, L3,
and control wiring in the terminal block.
Reconnect incoming power leads L1, L2, L3, and control wiring to the terminal block. Restore power source when
ready for operation.