Flowserve Limitorque MT Series User manual

Experience In Motion
USER INSTRUCTIONS
Installation
Operation
Maintenance
Limitorque MT Series
FCD LMENIM4201-00 – 06/10

Limitorque MT Series FCD LMENIM4201-00 – 06/10
2
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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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Contents
1 Introduction 5
1.1 Purpose 5
1.2 User Safety 5
2 Product Capabilities and Features 6
2.1 Product Identification 6
2.2 Initial Inspection and Recording of Operator Data 7
2.3 Storage Procedure 8
3 Operator Weights 9
4 Installation Instructions 10
4.1 Safety Precautions 10
4.2 Safety Practices 11
4.3 Installation 11
4.3.1 Installing an Operator with a Threaded Stem Nut 11
4.3.2 Installing an Operator with a Blank Stem Nut (MT-2, 3 and 4) 11
4.3.3 Installing an Operator with a Blank Stem Nut (MT-4) 12
5 Lubrication 13
5.1 Lubrication Inspection 13
5.2 Factory Lubricant 13
5.3 Minimum Lubricant Qualities Required 14
6 Disassembly and Reassembly 15
6.1 Disassembly and Reassembly of MT-2 16
6.1.1 Disassembly 16
6.1.2 Reassembly 16
6.2 Disassembly and Reassembly of MT-3 18
6.2.1 Disassembly 18
6.2.2 Reassembly 18
6.3 Disassembly and Reassembly of MT-4 20
6.3.1 Disassembly 20
6.3.2 Reassembly 20
6.4 Disassembly and Reassembly of Spur Gear Attachments 22
6.4.1 Disassembly of 3:1 Spur Gear Attachment for MT-2 22
6.4.2 Reassembly of 3:1 Spur Gear Attachment for MT-2 22
6.4.3 Disassembly of 6.3:1, 10.3:1, and 10.8:1
Spur Gear Attachments for MT-3 23
6.4.4 Reassembly of 6.3:1, 10.3:1, and 10.8:1
Spur Gear Attachments for MT-3 23
6.4.5 Disassembly of 5:1 Spur Gear Attachment for MT-4 25
6.4.6 Reassembly of 5:1 Spur Gear Attachment for MT-4 25
6.4.7 Disassembly of 17.5:1 Spur Gear Attachment for MT-4 27
6.4.8 Reassembly of 17.5:1 Spur Gear Attachment for MT-4 27
7 How to Order Parts 30

Limitorque MT Series FCD LMENIM4201-00 – 06/10
4
Figures
Figure 2.1 – MT Nameplate 8
Figure 6.1 – MT-2 Parts Diagram, Side View 17
Figure 6.2 – MT-2 Parts Diagram, Base View 17
Figure 6.3 – MT-3 Parts Diagram 19
Figure 6.4 – MT-4 Parts Diagram 20
Figure 6.5 – 3:1 SGA Parts Diagram for MT-2 22
Figure 6.6 – 6.3:1, 10.3:1, and 10.8:1 SGA Parts Diagram for MT-3 24
Figure 6.7 – 5:1 SGA Parts Diagram for MT-4 26
Figure 6.8 – 17.5:1 SGA Parts Diagram for MT-4 28
Tables
Table 3.1 – Operator Weights 9
Table 5.1 – Lubricant Quantities 14
Table 6.1 – Quantity of Ball Bearings 15
Table 6.2– MT-2 Parts List 17
Table 6.3 – MT-3 Parts List 19
Table 6.4 – MT-4 Parts List 21
Table 6.5 – 3:1 SGA Parts List for MT-2 23
Table 6.6 – 6.3:1, 10.3:1, and 10.8:1 SGA Parts List for MT-3 24
Table 6.7 – 5:1 SGA Parts List for MT-4 26
Table 6.8 – 17.5:1 SGA Parts List for MT-4 29

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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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1 Introduction
1.1 Purpose
This Installation, Operation and Maintenance Manual (IOM) explains how to install and maintain
the MT bevel gear operator. Information on installation, disassembly, lubrication, and spare parts is
provided.
1.2 User Safety
Safety notices in this manual detail precautions the user must take to reduce the risk of personal
injury and damage to the equipment. The user must read and be familiar with these instructions
before attempting installation, operation, or maintenance. Failure to observe these precautions could
result in serious bodily injury, damage to the equipment, void of the warranty, or operational difficulty.
Safety notices are presented in this manual in three forms:
cWARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning
notices could result in personal injury or death.
aCAUTION: 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 gear operator’s installation
and operation.

Limitorque MT Series FCD LMENIM4201-00 – 06/10
6
Designed to make operation of multi-turn valves easier The MT gear operator makes it easier to both
manually operate multi-turn valves and convert to a motorized service.
Built for reliable valve control — whether manual or motorized The MT offers torque ranges up to
6,000 ft-lb (8,135 N m) and thrust capacities to 150,000 lb (667 kN) for any application demanding
superior strength and accuracy.
Easily adaptable for other applications The MT is designed to be configured to each customer’s needs:
• Optional handwheel available for manual actuation
• Add a spur gear attachment for greater mechanical advantage
• Couple with an electric actuator from Limitorque for an economical, motorized, multi-turn package
2.1 Product Identification
The operator nameplate is located on top of the torque housing, over the input shaft. The nameplate
provides the product type and size, ratio, order and serial numbers, lubrication type and tagging
information.
2 Product Capabilities
and Features

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2.2 Initial Inspection and Recording of Operator Data
cWARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to store the gear operator.
Upon receipt of the gear operator, inspect the condition of the equipment and record nameplate
information.
1. Carefully remove gear operator from shipping carton or skid. Thoroughly examine the equipment
for any physical damage that may have occurred during shipment. If damaged, immediately
report the damage to the transport company.
2. A nameplate is attached to each gear operator with the following information:
• Operator Size
• Limitorque Order Number
• Ratio
• Serial Number
Record this information for future reference, for ordering parts or obtaining further information.

Limitorque MT Series FCD LMENIM4201-00 – 06/10
8
Figure 2.1 – MT Nameplate
2.3 Storage Procedure
NOTE: The following is the recommended storage procedure to retain maximum product integrity
during storage. Failure to comply with recommended procedure will void the warranty.
Storage (Less Than One Year)
Operators should be stored in a clean, dry, protected warehouse and should be stored on wooden
skids to protect the machined mounting flange. If the operators must be stored outside, they must be
covered in polyethylene protection with silica gel crystals to absorb moisture. Input shafts should be
rotated every three months to mix lubricant.

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3 Operator Weights
The approximate weights of the gear operators with solid (blank) stem nut, motorized adapter, with
and without spur gear attachment, are provided below:
Table 3.1 – Operator Weights
Operator Without SGA With SGA
lb kg lb kg
MT-2 95 43 124 56
MT-3 218 99 273 124
MT-4 745 339 875 398

Limitorque MT Series FCD LMENIM4201-00 – 06/10
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4 Installation Instructions
4.1 Safety Precautions
cWARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to install, operate, or troubleshoot the Limitorque operator.
cWARNING: Potential HIGH PRESSURE vessel — be aware of high-pressure hazards associated
with the attached valve or other actuated device when installing or performing maintenance
on the operator. Do not remove the operator mounting bolts from the valve or actuated device
unless the valve or device stem is secured or there is no pressure in the line.
cWARNING: For maintenance and/or disassembly of the operator while installed on the valve,
ensure that the operator is not under thrust or torque load. If the valve must be left in service, the
valve stem must be locked in such a way as to prevent any movement of the valve stem.
cWARNING: Do not manually operate the operator with devices other than the installed hand-
wheel. Using force beyond the ratings of the operator and/or using additive force devices such as
cheater bars, wheel wrenches, pipe wrenches, or other devices on the operator handwheel may
cause serious personal injury and/or damage to the operator and valve.
cWARNING: Do not exceed any design limitations or make modifications to this equipment
without first consulting Limitorque.
cWARNING: Use of the product must be suspended any time it fails to operate properly.
aCAUTION: If a motor actuator is driving the manual operator, do not operate the valve under
motor operation without first checking and setting the limit switch setting and checking for
correct motor rotation.
aCAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as
serious personal injury and/or damage to the operator and valve may result.

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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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4.2 Safety Practices
The following check points should be performed to maintain safe operation of the MT gear operator:
• Set up a periodic operating schedule on infrequently used valves.
• Ensure that the limit and/or torque switches on any electric actuator fitted to the bevel gear
operator are correctly and appropriately adjusted.
4.3 Installation
The MT series of gear operators has been designed to transmit torque as well as thrust. The gear
operator can be supplied with a threaded stem nut, keyed stem nut, or a blank stem nut.
4.3.1 Installing an Operator with a Threaded Stem Nut
1. Position operator above the valve stem.
2. Rotate the operator handwheel or wrench nut several turns until there is positive engagement
between the valve stem and the operator stem nut.
3. Rotate the handwheel to lower the operator onto the valve until contact has been made with the
valve flange.
4. Bolt the gear operator securely to the valve mounting flange.
4.3.2 Installing an Operator with a Blank Stem Nut
(MT-2, 3 and 4, one-piece)
1. Remove the thrust ring from the base of the operator.
aCAUTION: Care must be taken to ensure that the O-ring seals located on the ring are not
damaged.
2. Remove the stem nut assembly consisting of a bronze nut and two needle roller bearings (MT-2
and 3) or tapered thrust bearings (MT-4), with washers.
3. Remove bearings and washers. Place them in a clean and dry area until reassembly.
4. Machine the stem nut to suit the valve stem.
aCAUTION: Care should be taken to ensure that the clamping devices used during machining do
not damage surfaces of the stem nut.
5. Reassemble the operator, reversing steps 1, 2, and 3.
a. Install bearings and washers onto the bronze stem nut.
b. Install the assembly into the thrust base.
c. Bolt the thrust base assembly to the main housing.
aCAUTION: Ensure that no dirt or foreign material enters the operator.

Limitorque MT Series FCD LMENIM4201-00 – 06/10
12
6. Using the specified lubricant, grease the thrust base assembly through the grease fitting. See
Section 5 Lubrication, and Figure 6.1, 6.2, 6.3, and 6.4 for grease fitting location.
7. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.
4.3.3 Installing an Operator with a Blank Stem Nut (MT-4)
(Piece numbers refer to Figure 6.4 and Table 6.4).
1. Remove the key from the bottom of the operator. The key is located between the Thrust Drive
Sleeve (piece #117) and the Stem Nut (piece #392). The key is tapped (¼-20) to provide for
removal.
2. Remove the Stem Nut by rotating in the proper direction. The Stem Nut is threaded into the Thrust
Drive Sleeve (piece #394). A slot is provided on the end of the Stem Nut to aid in its removal.
3. Thread the Stem Nut to suit the valve stem.
aCAUTION: Do not clamp the splined area of the Stem Nut during the tapping operation.
4. Reassemble the operator, reversing steps 1 and 2. Stem Nuts should be positioned flush with the
Thrust Drive Sleeve but can be recessed inward approximately ¼ inch, if so desired. Stem Nuts
can also be positioned to extend below the Thrust Drive Sleeve approximately ¼ inch without
jeopardizing the thrust rating of the operator. All Stem Nuts are threaded on the outside diameter
using eight threads per inch.
5. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.

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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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5 Lubrication
The MT bevel gear operators have a sealed gear case, factory-lubricated with grease. No seal can
remain absolutely tight at all times. Therefore, it is not unusual to find a very small amount of
weeping around shaft seals — especially during long periods of idleness such as storage. Using
grease minimizes this condition as much as possible. If a small amount is weeping at start-up,
remove it with a clean cloth. Once the equipment is operating on a regular basis, the weeping should
stop.
5.1 Lubrication Inspection
Inspect the MT bevel gear operators for correct lubrication prior to operating — particularly following
a storage period. We recommend the operators be checked during an overhaul program.
5.2 Factory Lubricant
The MT series operator gear case is factory-lubricated with EP-0 lithium soap, mineral base grease,
suitable for temperatures from -20˚F (-29˚C) to 225˚F (107˚C).
aCAUTION: Do not mix lubricants of dissimilar bases.

Limitorque MT Series FCD LMENIM4201-00 – 06/10
14
Table 5.1 – Lubricant Quantities
Operator Without SGA With SGA
lb kg lb kg
MT-2 1.2 0.6 1.7 0.8
MT-3 2.2 1.0 2.7 1.2
MT-4 4.2 1.9 6.7 3.1
5.3 Minimum Lubricant Qualities Required
The standard lubricants used by Limitorque have been proven to be extremely reliable over years of
service. Lubricant substitute may be used; however, Limitorque does require the following lubricant
qualities as a minimum.
The lubricant must
• contain an “EP” additive.
• be suitable for the temperature range intended.
• be water- and heat-resistant and non-separating.
• not create more than 8% swell in Buna N or Viton.
• not contain any grit, abrasive, or fillers.
• be slump-prefer NLGI-0 grade.
• not be corrosive to steel gears, balls, or roller bearings.
• have a dropping point above 316°F (158°C) for temperature ranges of -20°F to 150°F
(-28°C to 65°C).

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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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6 Disassembly and Reassembly
No special tools are required for assembly/disassembly of the MT series bevel gear operators.
cWARNING: Valve must be in fully opened position with no pressure in the line to perform work
on the gear operator.
aCAUTION: During disassembly and reassembly, all removed components should be cleaned and
placed in an area free of dirt, water, or other foreign material.
aCAUTION: Care should be taken in removing the ball bearings located between the bevel gear and
thrust housing. These bearings are non-caged, hardened ground balls.
The table below indicates the number of ball bearings utilized by each MT size.
Table 6.1 – Quantity of Ball Bearings
Operator Quantity
MT-2 57
MT-3 53
MT-4 66

Limitorque MT Series FCD LMENIM4201-00 – 06/10
16
6.1 Disassembly and Reassembly of MT-2
6.1.1 Disassembly
(Piece numbers refer to Figure 6.1 and 6.2)
1. Remove the Thrust Ring (piece #5).
2. Pull out the Stem Nut (piece #4), Raceway Washers (piece #7), and Needle Bearings (piece #6).
3. Remove the End Cover (piece #20).
4. Slide out the Bevel Pinion Shaft/Bearing Subassembly (pieces #21, 22, and 23) together with the
Shims (piece #25).
5. Remove the Bevel Housing (piece #1) from the Thrust Housing (piece #2).
6. Remove the Bevel Gear (piece #3) and the Ball Bearings (piece #8).
NOTE: Please note the number and position of each Shim (piece #25).
6.1.2 Reassembly
(Piece numbers refer to Figures 6.1 and 6.2).
1. Install the Ball Bearings (piece #8) and the Bevel Gear (piece #3) onto the Thrust Housing (piece #2).
2. Install the Gasket (piece #62) and attach the Bevel Housing (piece #1) to the Thrust Housing
(piece #2).
3. Slide in the Bevel Pinion Shaft/Bearing Subassembly (pieces #21, 22, and 23) together with the
Shims (piece #25).
4. Attach the End Cover (piece #20).
5. Insert the Raceway Washer (piece #7), Needle Bearings (piece #6), and another Raceway Washer
(piece #7) onto the top flange of the Stem Nut (piece #4).
6. Insert the Stem Nut (piece #4) into the Thrust Housing.
7. Insert the Raceway Washer (piece #7), Needle Bearings (piece #6), and another Raceway Washer
(piece #7) onto the lower flange of the Stem Nut.
8. Attach the Thrust Ring (piece #5).
NOTE: Gasket compound is to be used on the Motorized Adapter - to - Actuator interface and the
Thrust Plate - to - Valve interface.
NOTE: Gasket compound is to be used on the Bevel Housing - to - End Cover/Motorized Adapter interface.

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Limitorque MT Series FCD LMENIM4201-00 – 06/10
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BASE VIEW A
FLOWSERVE-LIMITORQUE
SCALE ORDER NO.
DWG. NO.
SHEET 1 OF 1
REV.
TITLE
THIS DOCUMENT CONTAINS INFORMATION WHICH LIMITORQUE DEEMS CONFIDENTIAL
AND PROPRIETARY, THEREFORE, IT IS NOT TO BE USED, DUPLICATED, OR
DISCLOSED, IN WHOLE OR IN PART, WITHOUT THE WRITTEN CONSENT OF LIMITORQUE
CASTING AND OTHER DIMENSIONAL TOLERANCE
LIMITS ARE PER LIMITORQUE ENGINEERING DESIGN
STANDARDS (EDS).
MATERIAL
5114 WOODALL ROAD, LYNCHBURG, VIRGINIA 24506-1318
PROPRIETARY NOTICE
REVISIONS
REV. DESCRIPTION
DATE
BY
APPVD
GENERAL C/N
B
SIZE
DRAWN
CHECKED
APPROVED
DATE
DATE
DATE
1. ALL DIMENSIONS ARE IN INCHES.
2. REMOVE ALL BURRS AND SHARP CORNERS
3. MACHINED SURFACE FINISH TO BE 250
MICROINCHES.
4.FILLET RADII MAY BE TURNED UP TO .020
BELOW THE FINISH DIAMETER.
5. DIMENSIONS IN PARENTHESIS (X..XXX) ARE
FOR REFERENCE ONLY.
6. DIMENSIONS IN BRACKETS [X.XXX] ARE FOR
MANUFACTURING DATA ONLY.
7. ALL VIEWS ARE THIRD ANGLE PROJECTIONS.
8. DIMENSIONING, TOLERANCING, SYMBOLS,
THREADS, ETC. ARE PER LIMITORQUE
ENGINEERING DESIGN STANDARDS (EDS)
GENERAL MANUFACTURING NOTES UNLESS
OTHERWISE SPECIFIED:
L1065 12/15/93 CF-RGP
TOLERANCE LIMITS UNLESS OTHERWISE SPECIFIED:
MACHINED DIMENSIONS:
.X =
±.04
.XX =
±.02
.XXX =
±.010
ANGLES =
±5°
FILLET RADII =
±.015 ( > .031 )
=
±.007 ( < .031 )
DEFAULT FILLET RADII = .015/.039
CHAMFERS =
±.02
TAP DEPTHS ARE MINIMUM
UNIT ASSEMBLY,
MT-2
KDC 5/31/05
01-602-0993-2
1:2
BB 5/31/05
BB 5/31/05
A CORRECTED BALLOON NOS. AND PART NO. FOR ITEM 23 BB
12/7
2007
B
KDC
NA
6/1
2009
BB
ADD ADDITIONAL GREASE FITTING & RELIEF VIEW A
PC#14, 15, 16, 19, 26 NAMEPLATE & ALIGN BALLOONS WITH B320'S
NAB
23900-1025
1
2
3
8
14
19
5
21
961
7
6
11
23 22
29
24
4
12 13
27 28
14
11
10
20
17
18
60
15
19
14 26
16
62
BASE VIEW A
FLOWSERVE-LIMITORQUE
SCALE ORDER NO.
DWG. NO.
SHEET 1 OF 1
REV.
TITLE
THIS DOCUMENT CONTAINS INFORMATION WHICH LIMITORQUE DEEMS CONFIDENTIAL
AND PROPRIETARY, THEREFORE, IT IS NOT TO BE USED, DUPLICATED, OR
DISCLOSED, IN WHOLE OR IN PART, WITHOUT THE WRITTEN CONSENT OF LIMITORQUE
CASTING AND OTHER DIMENSIONAL TOLERANCE
LIMITS ARE PER LIMITORQUE ENGINEERING DESIGN
STANDARDS (EDS).
MATERIAL
5114 WOODALL ROAD, LYNCHBURG, VIRGINIA 24506-1318
PROPRIETARY NOTICE
REVISIONS
REV. DESCRIPTION
DATE
BY
APPVD
GENERAL C/N
B
SIZE
DRAWN
CHECKED
APPROVED
DATE
DATE
DATE
1. ALL DIMENSIONS ARE IN INCHES.
2. REMOVE ALL BURRS AND SHARP CORNERS
3. MACHINED SURFACE FINISH TO BE 250
MICROINCHES.
4.FILLET RADII MAY BE TURNED UP TO .020
BELOW THE FINISH DIAMETER.
5. DIMENSIONS IN PARENTHESIS (X..XXX) ARE
FOR REFERENCE ONLY.
6. DIMENSIONS IN BRACKETS [X.XXX] ARE FOR
MANUFACTURING DATA ONLY.
7. ALL VIEWS ARE THIRD ANGLE PROJECTIONS.
8. DIMENSIONING, TOLERANCING, SYMBOLS,
THREADS, ETC. ARE PER LIMITORQUE
ENGINEERING DESIGN STANDARDS (EDS)
GENERAL MANUFACTURING NOTES UNLESS
OTHERWISE SPECIFIED:
L1065 12/15/93 CF-RGP
TOLERANCE LIMITS UNLESS OTHERWISE SPECIFIED:
MACHINED DIMENSIONS:
.X =
±.04
.XX =
±.02
.XXX =
±.010
ANGLES =
±5°
FILLET RADII =
±.015 ( > .031 )
=
±.007 ( < .031 )
DEFAULT FILLET RADII = .015/.039
CHAMFERS =
±.02
TAP DEPTHS ARE MINIMUM
UNIT ASSEMBLY,
MT-2
KDC 5/31/05
01-602-0993-2
1:2
BB 5/31/05
BB 5/31/05
A CORRECTED BALLOON NOS. AND PART NO. FOR ITEM 23 BB
12/7
2007
B
KDC
NA
6/1
2009
BB
ADD ADDITIONAL GREASE FITTING & RELIEF VIEW A
PC#14, 15, 16, 19, 26 NAMEPLATE & ALIGN BALLOONS WITH B320'S
NAB
23900-1025
1
2
3
8
14
19
5
21
961
7
6
11
23 22
29
24
4
12 13
27 28
14
11
10
20
17
18
60
15
19
14 26
16
62
Figure 6.2 – MT-2 Parts Diagram, Base View
Piece Quantity Description
1 1 Bevel Housing
2 1 Thrust Housing
3 1 Bevel Gear
4 1 Stem Nut
5 1 Thrust Ring
6 2 Needle Bearings
7 4 Raceway Washer
8 57 Ball Bearing
9, 10 2 O-ring
11 2 O-ring
12 8 Lockwasher
13 8 Hex Head Cap Screw
14 3 Grease Fitting
15 1 Flat Washer
16 1 CSK Socket Set Screw
Piece Quantity Description
17 1 Nameplate (Blank)
18 2 Drive Screw
19 2 Relief Fitting
20 1 End Cover/ Motorized Adapter
21 1 Input Pinion
22 2 Spacer
23 3 Radial Ball Bearing
24 1 O-Ring
25 1 Shim
26 1 Key
27 4 Lockwasher
28 4 Hex HD Cap Screw
29 1 Retaining Ring
60 1 Transit Plug
61 1 O-Ring
62 1 Gasket
63 1 Pipe Plug
Table 6.2– MT-2 Parts List

Limitorque MT Series FCD LMENIM4201-00 – 06/10
18
Figure 6.1 – MT-2 Parts Diagram, Side View
6.2 Disassembly and Reassembly of MT-3
6.2.1 Disassembly
(Piece numbers refer to Figure 6.3)
1. Remove the Thrust Ring (piece #11).
2. Pull out the Stem Nut (piece #10), Raceway Washers (piece #13), and Needle Bearings (piece #12).
3. Remove Motorized Adapter (piece #9).
4. Slide out the Bevel Pinion Shaft/Bearing Subassembly (piece# 5, 7, and 8) together with
Spacers (piece #6).
5. Remove the Bevel Housing (piece #4) from the Thrust Base (piece #1).
6. Remove the Bevel Gear (piece #3) and Ball Bearings (piece #2).
NOTE: Please note the number and position of each Spacer (piece #6).
6.2.2 Reassembly
(Piece numbers refer to Figures 6.3).
1. Install the Ball Bearings (piece #2) and Bevel Gear (piece #3) onto the Thrust Base (piece #1).
2. Attach the Bevel Housing (piece #4) to the Thrust Base (piece #1).
3. Slide in the Bevel Pinion Shaft/Bearing Subassembly (piece #5, 7, and 8) together with the
Spacers (piece #6).
4. Attach the Motorized Adapter (piece #9).
5. Insert the Raceway Washer (piece #13), Needle Bearings (piece #12), and another Raceway
Washer (piece #13) onto the top flange of the Stem Nut (piece #10).
6. Insert the Stem Nut (piece #10).
7. Insert the Raceway Washer (piece #13), Needle Bearings (piece #12), and another Raceway
Washer (piece #13) onto the lower flange of the Stem Nut.
8. Attach the Thrust Ring (piece #11).
NOTE: Gasket compound is to be used on the Motorized Adapter - to - Actuator interface and the
Thrust Plate - to - Valve interface.
NOTE: Gasket compound is to be used on the Bevel Housing - to - End Cover/Motorized Adapter interface.

19
Limitorque MT Series FCD LMENIM4201-00 – 06/10
flowserve.com
FLOWSERVE-LIMITORQUE
SCALE ORDER NO.
DWG. NO.
SHEET
1 OF 1
REV.
TITLE
THIS DOCUMENT CONTAINS INFORMATION WHICH LIMITORQUE DEEMS CONFIDENTIAL
AND PROPRIETARY, THEREFORE, IT IS NOT TO BE USED, DUPLICATED, OR
DISCLOSED, IN WHOLE OR IN PART, WITHOUT THE WRITTEN CONSENT OF LIMITORQUE
CASTING AND OTHER DIMENSIONAL TOLERANCE
LIMITS ARE PER LIMITORQUE ENGINEERING DESIGN
STANDARDS (EDS).
MATERIAL
5114 WOODALL ROAD, LYNCHBURG, VIRGINIA 24506-1318
PROPRIETARY NOTICE
REVISIONS
REV. DESCRIPTION
DATE
BY
APPVD
GENERAL C/N
B
SIZE
DRAWN
CHECKED
APPROVED
DATE
DATE
DATE
1. ALL DIMENSIONS ARE IN INCHES.
2. REMOVE ALL BURRS AND SHARP CORNERS
3. MACHINED SURFACE FINISH TO BE 250
MICROINCHES.
4.FILLET RADII MAY BE TURNED UP TO .020
BELOW THE FINISH DIAMETER.
5. DIMENSIONS IN PARENTHESIS (X..XXX) ARE
FOR REFERENCE ONLY.
6. DIMENSIONS IN BRACKETS [X.XXX] ARE FOR
MANUFACTURING DATA ONLY.
7. ALL VIEWS ARE THIRD ANGLE PROJECTIONS.
8. DIMENSIONING, TOLERANCING, SYMBOLS,
THREADS, ETC. ARE PER LIMITORQUE
ENGINEERING DESIGN STANDARDS (EDS)
GENERAL MANUFACTURING NOTES UNLESS
OTHERWISE SPECIFIED:
L1065 12/15/93 CF-RGP
TOLERANCE LIMITS UNLESS OTHERWISE SPECIFIED:
MACHINED DIMENSIONS:
.X =
±.04
.XX =
±.02
.XXX =
±.010
ANGLES =
±5°
FILLET RADII =
±.015 ( > .031 )
=
±.007 ( < .031 )
DEFAULT FILLET RADII = .015/.039
CHAMFERS =
±.02
TAP DEPTHS ARE MINIMUM
KDC 5/17/05
UNIT ASSEMBLY, MT-3
1:2
01-602-0992-2 B
KR 11/11/05
KGR 11/11/05
AADD PIECE #26,27,28,29,30,31,33,62 TO AGREE W/BOM BB 9-9
2009
23900-1022
NA KDC
2-17
-10
NA ADD PIECE #32 TO AGREE W/BOM BKDC
7
1
4
6
4
3
2
10 11
13
12
8
22
17
19
18
21
20
25
29 33
27
62
16
28
9
26
3130
32
23 24
14
15
16
Figure 6.3 – MT-3 Parts Diagram
Piece Quantity Description
1 1 Thrust Base
2 53 Ball Bearing
3 1 Bevel Gear
4 1 Bevel Housing
5 2 Radial Ball Bearing
6 2 Spacer
7 1 Input Pinion
8 1 Retaining Ring
9 1 Motorized Adapter
10 1 Stem Nut
11 1 Thrust Ring
12 2 Needle Bearings
13 4 Raceway Washer
14 8 Hex HD Cap Screw
15 7 Lockwasher
16 3 O-Ring
17 3 Relief Fitting
Piece Quantity Description
18 1 Lip Seal
19 1 Flat Head Screw
20 1 Lockwasher
21 1 Stat-O-Seal Washer
22 1 O-Ring
23 4 Hex HD Cap Screw
24 4 Lockwasher
25 1 Stat-O-Seal Washer
26 1 Key
27 1 Flat Washer
28 4 Pipe Plug
29 2 Drive Screw
30 1 Shim
31 1 Shim
32 1 Spacer Ring
33 1 Nameplate
62 1 Gasket
Table 6.3– MT-3 Parts List

Limitorque MT Series FCD LMENIM4201-00 – 06/10
20
6.3 Disassembly and Reassembly of MT-4
6.3.1 Disassembly
(Piece numbers refer to Figure 6.4).
1. Remove Thrust Plate (piece #118) followed by Stem Nut (piece #392, two-piece) and Drive Sleeve
(piece #117, 2-piece; piece #394, one-piece) and Roller Bearings (piece #115 and 116).
2. Remove Bevel Cap (piece #94) and withdraw Bevel Pinion/Bearing Subassembly (piece
#95, #103 and #104).
3. Remove Bevel Housing (piece #91) from Thrust Housing (piece #114).
4. Remove Bevel Gear/Torque Drive Sleeve subassembly (piece #93 and 96) and Ball Bearings (piece
#102).
6.3.2 Reassembly
(Piece numbers refer to Figure 6.4).
1. Install Ball Bearings (piece #102) and Bevel Gear/Torque Drive Sleeve subassembly (piece #93 and 96).
2. Attach Bevel Housing (piece #91) to Thrust Base (piece #114).
3. Attach Bevel Cap (piece #94) and Bevel Pinion/Bearing Subassembly (piece#95, #103 and #104).
113
111
395
119
117 393 392 394 120 118
114
106
100
96
93
102 336
115
116
99
95
97
108
107
94
105
121
109
124
104
122
347
105
103
110
91
Two-Piece Stem Nut Design One-Piece Stem Nut Design