Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
9 Standard Wiring Diagrams 49
10 Troubleshooting 52
11 How to Order Parts 53
12 Regulatory Information 54
Figures
Figure 3.1 – L120-190 through 2000 8
Figure 5.1 – Double Torque Switch 13
Figure 5.2 – Setting Torque Switch 14
Figure 5.3 – Ring Tongue Terminal 15
Figure 5.4 – Geared Limit Switch 17
Figure 5.5 – Setting Geared Limit Switch 18
Figure 5.6 – Position Indicators 19
Figure 5.7 – Typical Connection for a 1000 ohm Potentiometer 20
Figure 8.1 – L120-190 and -420 Drive Sleeve Side View (Refer to Table 8.1 for parts list) 30
Figure 8.2 – L120-190 and -420 Worm Shaft Side View (Refer to Table 8.1 for parts list) 31
Figure 8.3 – L120-190 and -420 Top View (Refer to Table 8.1 for parts list) 32
Figure 8.4 – L120-800 Drive Sleeve Side View (Refer to Table 8.1 for parts list) 33
Figure 8.5 – L120-800 Worm Shaft Side View (Refer to Table 8.1 for parts list) 34
Figure 8.6 – L120-800 Top View (Refer to Table 8.1 for parts list) 35
Figure 8.7 – L120-2000 Drive Sleeve Side View (Torque Base) (Refer to Table 8.2 for parts list) 43
Figure 8.8 – L120-2000 Top View (Refer to Table 8.2 for parts list) 44
Figure 8.9 – L120-2000 Side View (Refer to Table 8.2 for parts list) 45
Figure 8.10 – L120-2000 Exploded View 46
Figure 9.1 – Wiring Diagram – No Controls 49
Figure 9.2 – Wiring Diagram – Integral Controls 50
Figure 9.3 – Wiring Diagram – NCU 51
Tables
Table 4.1 – Actuator Weights 10
Table 5.1 – Mounting Base Dimensions 13
Table 5.2 – Maximum Stem Acceptance 13
Table 5.3 – Terminal Dimensions By Cable Size 16
Table 5.4 – Maximum Drive Sleeve Turns 17
Table 7.1 – Lubricant Weights 25
Table 8.1 – L120-190, -420 and -800 typical parts list 36
Table 8.2 – L120-2000 typical parts list 47
4
1
Limitorque
Introduction
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
1.1 Purpose
This Installation and Maintenance Manual explains how to install and maintain L120-190 through -2000
actuators. Information on installation, disassembly, reassembly, lubrication, and 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, warranty void, or operational difficulty.
Safety notices are presented in this manual in three forms:
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 actuator’s installation and
operation.
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2
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Product Capabilities and Features
L120 Series actuators operate without modification in any rising or non-rising stem application for
linear-action valves.
The actuators meet rigid safety requirements and are available in weatherproof, explosionproof, and
submersible configurations.
The actuators are compatible with a wide range of control options from stand-alone actuators with local
control stations to open standards-based DDC-100 networks with up to 250 actuators.
The actuators are designed with integral control packages including plug-in interconnect boards that
increase control functionality for stand-alone or networked actuators.
Torque overload protection is provided in both directions of travel.
6
Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Initial Inspection
and Storage Instructions
3
c WARNING: Read this Installation and Maintenance Manual carefully and completely before
attempting to store the actuator. Be aware of the electrical hazards.
3.1 Product Identification
The actuator nameplate is located on the back of the actuator opposite the limit switch controls
compartment. The nameplate contains the following information:
• Limitorque name
• Point of manufacture
• Actuator size
The motor nameplate is located on the motor. The nameplate contains the following information:
• ID number
• Run torque
• RPM
• Full load amps
• Insulation class
• Space heater size
• Service Factor
• Cycles
• Ambient temperature
• Start torque
• Order number
• Serial number
• Customer tagging
• Enclosure type
• Volts
• Locked rotor amps
• Duty
• Horsepower
• Phase
• Motor code
• Connection diagram
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7
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Figure 3.1 – L120-190 through 2000
Motor
Declutch
Lever
Actuator Nameplate
(hidden)
Housing
Limit Switch
and Controls
Compartment
Handwheel
3.2 Inspection and Recording
Upon receipt of the actuator, inspect the condition of the equipment and record nameplate information.
1. Carefully remove actuator 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. Record the actuator nameplate information for future reference, i.e., ordering parts, obtaining
further information.
3.3 Storage Procedures
NOTE: The following are our recommended storage procedures to retain maximum product integrity
during short-term storage. Failure to comply with recommended procedures will void the warranty. For
longer-term storage, contact Limitorque for procedures and recommendations.
3.3.1 Short-Term Storage (less than 1 year)
Actuators are not weatherproof until properly installed on the valve or prepared for storage.
Store actuators in a clean, dry, protected warehouse away from excessive vibration and rapid tempera-
8
ture changes. If the actuators must be stored outside, they must be stored off the ground, high enough
to prevent them from being immersed in water or buried by snow.
Limitorque
1. Position the actuator in storage with motor and switch compartment horizontal.
2. Connect the space heaters (if supplied) or place desiccant in the switch compartment.
3. Connect space heaters if actuator is to be stored in a damp place.
4. Replace all plastic caps or plugs with pipe plugs and ensure that all covers are tight.
5. If the actuator is mounted on a valve and the stem protrudes from the actuator, a suitable stem
cover must be provided.
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
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4
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Actuator Weights
The approximate L120 actuator weights are provided below:
Table 4.1 – Actuator Weights
Actuator SizeControl Types
3
NCU
3
L120-190
L120-420
L120-800NCU
L120-2000NCU
Note 1: Torque Only
Note 2: Torque and Thrust
Note 3: NCU = No Controls Actuator
BIC = Basic Integral Controls
UEC = Universal Electronic Controller
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Installation Instructions
5.1 Safety Precautions
c WARNING: Read this Installation and Maintenance Manual carefully and completely before
attempting to install, operate, or troubleshoot the Limitorque actuator.
c WARNING: Be aware of electrical hazards. Turn off incoming power before working on the
actuator and before opening the switch compartment.
c WARNING: 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 actuator. Do not remove the actuator mounting bolts from the valve or actuated device
unless the valve or device stem is secured or there is no pressure in the line.
c WARNING: For maintenance and/or disassembly of the actuator while installed on the valve,
ensure that the actuator 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.
c WARNING: Do not attempt to remove the spring cartridge cap, housing cover, or stem nut
locknut from the actuator while the valve or actuated device is under load.
c WARNING: Do not manually operate the actuator with devices other than the installed hand-
wheel and declutch lever. Using force beyond the ratings of the actuator and/or using additive
force devices such as cheater bars, wheel wrenches, pipe wrenches, or other devices on the
actuator handwheel or declutch lever may cause serious personal injury and/or damage to the
actuator and valve.
c WARNING: Do not exceed any design limitations or make modifications to this equipment
without first consulting Limitorque.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
c WARNING: Actuators equipped with electrical devices (motors, controls) requiring field wiring
must be wired and checked for proper operation by a qualified tradesman.
c WARNING: Use of the product must be suspended any time it fails to operate properly.
a CAUTION: Do not use oversized motor overload heaters. Instead, look for the cause of the
overload.
a CAUTION: Do not operate the valve under motor operation without first setting or checking the
limit switch setting and motor direction.
a CAUTION: Do not force the declutch lever into the motor operation position. The lever returns to
this position automatically when the motor is energized.
a CAUTION: Do not depress the declutch lever during motor operation to stop valve travel.
a CAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as
serious personal injury and/or damage to the actuator and valve may result.
a CAUTION: Do not lift actuator/gearbox or actuator/valve combinations with only the eye bolts in
the L120 actuator. These eye bolts are designed for lifting the L120 actuator only.
a CAUTION: Do not lift the actuator by handwheel.
5.2 Safety Practices
The following check points should be performed to maintain safe operation of the L120 actuator:
• Eye bolts are designed for lifting only the actuator and not associated gearboxes or valves.
• Mount motor on a horizontal plane, if possible. Preferably, keep the motor or limit switch compartment from hanging down. This prevents head of grease from being against motor or switch seals.
• Keep the switch compartment clean and dry.
• Keep the valve stem clean and lubricated.
• Set up periodic operating schedules for infrequently used valves.
• Verify that all actuator wiring is in accordance with the applicable wiring diagram.
• Carefully check for correct motor rotation direction. If the motor is driving the valve in the wrong
direction, interchange any two leads on the three-phase motor or switch the armature leads on DC
motors.
• Use a protective stem cover. Check valve stem travel and clearance before mounting covers on rising
stem valves.
• Verify that a locking nut tightly secures the stem nut and that the top thread of the lock nut is crimped
and staked in two places.
• For the DC motor, keep the armature clean and periodically check brushes for proper contact and wear.
12
5.3 Actuator Preparation
NOTE: Replace all molded plastic conduit and top protectors (installed for shipping purposes only) with
pipe plugs when installation wiring is complete.
Limitorque
OPEN
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
5.3.1 Mounting Base
The mounting hole sizes and quantities are as detailed in Table 5.1, below:
Table 5.1 – Mounting Base Dimensions
Actuator Size
L120-1908¾–10 x 1.13M20 x 2.5 x 3211.75298 mm
L120-4208
L120-800 (Torque Only)8¾–10 x 1.63N/A17.0N/A
L120-800 (Thrust Only)81.25–7 x 2.0N/A16N/A
Mounting HolesTap Size
QuantityMSSMSS
7
⁄8–9 x 1.75 N/A14.0N/A
ISO
Bolt Circle
ISO
L120-2000 (Torque Only)
L120-2000 (Thrust Only)121-½–6 x 3.0N/A18.0N/A
16
1–8 x 2.0N/A23.5N/A
5.3.2 Stem Acceptance
The maximum stem acceptance is provided in Table 5.2, below:
Table 5.2 – Maximum Stem Acceptance
Actuator size
L120-1903.5892.87573¾ x ¼20 x 12
L120-42051274.251081 x ¾28 x 16
L120-800512771781 x ¾32 x 18
L120-20006.251598.002031¼ x
NOTE: For complete mounting dimensions, see sales brochure LMENBR1200.
Drive 2 TappedDrive 1 BoreDrive 1 Key
inchmminchmminchmm
7
⁄840 x 22
5.4 Double Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
Figure 5.1 – Double Torque Switch
NOTE: See Caution and Note on following page.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
a CAUTION: Disconnect all incoming power before opening limit switch compartment or working
on the torque switch.
• Do not use abrasive cloth to clean the contacts on the torque switch.
• Do not torque-seat 90° operation valves or run them against the stops. This may cause damage
to the valve.
NOTE: If the actuator has “torqued out,” release torque buildup by operating the actuator manually in
opposite direction ½ to 1 turn of the output drive sleeve.
NOTE: Torque switch contacts are rated 600 volts, in accordance with NEMA ICS-2.
5.4.1 Setting Torque Switch
The torque switch was set at the factory according to customer-supplied information regarding necessary torque or thrust output provided at the time of the order. However, if the torque switch is newly
installed or the setting needs to be adjusted, follow the procedure below:
a CAUTION: A maximum stop setting plate is provided on most actuators. Do not remove this
plate. Do not exceed the setting indicated by this plate without contacting Limitorque.
• Installing or adjusting the torque switch with the operator in a “loaded” condition will result in a
loss of torque protection.
Item letters correspond to Figure 5.2.
1. Place the L120 actuator in manual mode.
2. Release the load on the wormshaft spring pack. Put operator in manual mode and operate in
opposite direction until switch is in neutral position.
3. For open and close directions, loosen Screw (A) and move Pointer (B) to desired position. A higher
number indicates a high torque and/or thrust output.
4. Tighten Screw (A).
5. Operate the valve electrically to seat the valve and to ensure tight shutoff.
Figure 5.2 – Setting Torque Switch
Maximum Stop
Setting Plate
14
B
Torque Switch Dial
A
Limitorque
A
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
5.4.2 Balancing Torque Switch
Item letters correspond to Figure 5.2.
1. Place the actuator in manual mode.
2. Remove the load from the wormshaft spring pack.
NOTE: If the actuator has “torqued out,” release torque buildup by operating the actuator manually in
opposite direction ½ to 1 turn.
3. Note the open and close torque switch settings prior to re-installing the torque switch.
4. Loosen Screws (A) and position both Pointers (B) at the #1 setting; tighten Screws (A).
5. Mount the torque switch and tighten the mounting screws. Verify that both contact pointers are
touching the arms. The interface between the pointers and the arm is found beneath the torque
switch dial. If the pointers and the arms are not in contact, the clearance on the open and close
torque switches should be equal. If not equal, the torque switch needs to be balanced. (See Step 7.)
6. If the pointers and arms are in contact on both sides of the switch, manually rotate the torque
switch dial clockwise and counter-clockwise to determine if there is equal backlash in both directions of rotation. If there is not equal backlash in both directions, the torque switch needs to be
balanced. (See Step 7.)
7. Loosen both hex nuts.
8. Back out one setscrew and tighten the other setscrew until there is equal backlash in both directions
of rotation of the dial, or equal clearance between the pointers and arms.
9. Tighten the hex nuts and return the torque switch to its original settings.
a CAUTION: The balancing screws should not be touched except during the balancing procedure.
The switch is now balanced and ready for the pointers to be returned to their original settings.
5.4.3 Torque Switch Terminal Connections
Wiring connections to the L120 geared limit switch, torque switch, and marathon terminal strips are to
be made using ring-tongue terminals as shown below:
Figure 5.3 – Ring Tongue Terminal
C
B
See Table 5.3, next page
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flowserve.com
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Table 5.3 – Terminal Dimensions By Cable Size
AWGScrew HoleInsulation
22-16#10Vinyl18RA-10.97.31.27
18-14#10Vinyl14RB-10.97.31.27
12-10#10Vinyl14RC-101.06.31.27
Terminals are to be crimped using Thomas & Betts crimping tool WT111M.
Thomas &
Betts P/N
ABC
5.5 Geared Limit Switch – Rotor Type
a CAUTION: The geared limit switch is not preset at the factory and must be adjusted after the
actuator has been mounted on associated equipment.
NOTE: Limit switch contacts are rated 600 volts, in accordance with NEMA ICS-2
• Disconnect all incoming power to the actuator prior to opening the limit switch compartment and
adjusting the switch.
• Consult the relevant wiring diagram for limit switch contact development. All L120 actuators are
supplied with 16-contact limit switches - four switches on each of the four rotors. Two rotors are
used for end-of-travel indication. The remaining two rotors may be adjusted for any intermediate
point-of-travel.
• Do not use abrasive cloth to clean the contacts on the limit switch.
• Do not attempt to repair gearing in the limit switch. Replace entire gear frame assembly if necessary.
16
5.5.1 Setting Limit Switch
The maximum number of drive sleeve turns available is a funtion of actuator size, worm gear ratio,
and type of switch. See Table 5.4. The Intermediate Shaft shown in Figure 5.5 may take a considerable
number of turns before rotor trip occurs.
c WARNING: Potential Explosion Hazard. Do not use a variable speed electric drill for setting the
limit switch in an explosive environment.
a CAUTION: When setting the limit switch rotor segments (cams) using a variable speed electric
drill, do not run drill at speeds higher than 200 RPM. Operating the drill at high speeds can
damage the gearing within the limit switch.
Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Table 5.4 – Maximum Drive Sleeve Turns
Limit Switch GearingPIC Gearing
Actuator SizeW.G. Ratio4-Gear5-GearPIC or R/I (270)RVDT(90)
L120-19013.3:1311031100137064569
33:112501250055211837
60:1690690030371012
85:1N/AN/AN/AN/A
L120-42010.33:1N/AN/AN/AN/A
16:1330033000114053797
41:112801280044451481
57:1910910031951065
80:1N/AN/AN/AN/A
L120-80012.67:1N/AN/AN/AN/A
19:128502850095863195
49:110501050037201240
58:1N/AN/AN/AN/A
86:1N/AN/AN/AN/A
L120-200043:112101210042341413
71:174074002566855
Figure 5.4 – Geared Limit Switch
Set the limit switch as shown on the following page. All item letters and piece numbers refer to Figure 5.5.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Unless otherwise noted part numbers refer to Figure 5.5.
1. Open the Limit Switch Compartment Cover (piece #200-1 of Figure 8.3 for L120-190 and -420,
Figure 8.6 for L120-800, and Figure 8.7 for L120-2000).
2. Put the actuator into manual operation. Use the handwheel to operate the valve in the “open”
direction. While operating the valve, note the direction of rotation of the Intermediate Shaft
corresponding to the rotor or rotors to be set.
3. When the valve is fully open, close it one turn of the handwheel to allow for coast of moving parts.
4. Push in the Clutch Screw and turn one-quarter turn. The rod will latch in this depressed position.
5. Refer to the applicable wiring diagram for contact development. The limit switch contact is closed
when the rotor is engaged with the plunger. If the rotor to be set has not turned 90° to operate
the plunger, turn the intermediate shaft in the same direction as noted in Step No. 2 until the rotor
clearly trips the switches. This rotor is now set correctly.
6. If the intermediate position rotors 1 and 2 are also to be set at any desired position, repeat the
setting operation in steps 1 through 5 above.
7. Before moving the valve, depress and turn the Clutch Screw counterclockwise one-quarter turn to
the spring-released position. Insert a screwdriver into the intermediate shafts to ensure that they are
loaded in position and will not rotate.
Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
NOTE: The cross-slotted shafts A, B, C, and D have been designed for use with a No. 2 Phillips
screwdriver shank chucked into a variable speed reversible electrical drill. Do not run drill at speeds
higher than 200 RPM (see previous CAUTION on page 16).
a CAUTION: Do not operate the valve when the Clutch Screw is in a fully depressed position. Loss
of contact setting will occur and the setting rod will be damaged.
8. Operate the valve by handwheel to the fully “close” position; reverse direction by one turn of the
handwheel to allow for coast of moving parts.
9. Set the other rotors by following steps 1 through 7.
10. Secure the Limit Switch Compartment Cover (piece #200-1 of Figure 8.3 for L120-190 and -420,
Figure 8.6 for L120-800, and Figure 8.7 for L120-2000).
NOTE: For actuators having captive bolts, pull-down torque must not exceed 30 ft lbs.
5.5.2 Combination of Contacts
Refer to Figure 5.5.
The rotor segments can be separated and rotated through 90° to give various combinations of normally
open or normally closed contacts to each rotor.
1. Remove Nuts (piece #8) and Fillister Head Machine Screws (piece #5) for a total of two fasteners on
each side of the switch.
2. Remove complete contact assembly from the back plate.
3. Rearrange cams on the camshaft to produce the required combination of contacts.
4. Replace contact assembly on back-plate (ensuring the registers fit correctly) and secure with the
machine screws and nuts.
5.6 Position Indication
5.6.1 Local Position Indication
The local dial position indicator is factory-built per the application. The position indicator can only be
adjusted when mounted on the valve.
Figure 5.6 – Position Indicators
MID-TRAVEL
CLOSE
OPEN
50
25
75
0
PERCENT
O PEN
100
NOTE: See the setting procedure on the following page.
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flowserve.com
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
1000 ohms
To set the local position indicator:
1. Disconnect all incoming power and remove Limit Switch Compartment Cover (piece #200-1 of
Figure 8.3 for L120-190, -420 and -800, and Figure 8.7 for L120-2000).
2. Using the handwheel place the valve in the fully “close” position.
3. Loosen the round head machine screw which holds the pointer in place; move the pointer to the “O”
position, and re-tighten the screw.
The indicator is now set.
NOTE: The end-of-travel rotors of the geared limit switch activate “flip-flop” type indicators. This type of
indicator will require no further setting after the geared limit switch has been adjusted.
5.6.2 Remote Position Indication
The remote position indicator is a Limitorque digital position indicator. This indicator is a digital LED
display module that displays valve position in 1% increments. The readout accepts inputs from signals
of 4-20 mA, 0-2 V, or a 1000 ohm feedback potentiometer (mounted on the MDPI). The readout is
accurate to 1% +/- 1 digit.
5.6.3 Calibrating Position Transmitter PT20SD
1. Position the actuator to mid-travel value at 50% position.
2. Disconnect the potentiometer wiring harness from the PT20SD board and measure the resistance
from each end connection to the center connection on the potentiometer.
3. Set the potentiometer to the correct resistance reading. Loosen the setscrew that retains the spur
gear on the potentiometer shaft and rotate the shaft until a reading of 500 ohms is achieved.
4. Tighten the setscrew and reconnect the wiring harness to the PT20SD.
5. Run the actuator fully CLOSED.
6. Calibrate ZERO position by adjusting the zero potentiometer until a 4mA output signal is read at
terminal +Ve and -Ve.
7. Run the actuator fully OPEN.
8. Calibrate SPAN position by adjusting the span potentiometer until a 20mA output signal is read at
terminals +Ve and -Ve.
9. Repeat steps 5 through 8 and fine-tune as necessary.
Figure 5.7 – Typical Connection for a 1000 ohm Potentiometer
20
Gearing
Receiver
+
-
Customer Equipment
DC Power
Suppl y
-
+
6
Limitorque
Operation
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
c WARNING: See Sections 5.1 and 5.2 Safety Precautions and Safety Practices.
c WARNING: Do not manually operate the actuator with devices other than the installed
Handwheel and Declutch Lever. Using force beyond the ratings of the actuator and/or using
additive force devices such as cheater bars, wheel wrenches, pipe wrenches or other devices on
the actuator Handwheel or Declutch Lever may cause serious personal injury and/or damage to
the actuator or valve.
a CAUTION: Do not motor-operate the valve without first setting or checking the limit switch
setting and motor direction. If the valve closes when the open button is pushed, the motor may
need to be electrically reversed.
• Do not force the declutch lever into hand operation. If the clutch does not easily engage, rotate
handwheel slowly while operating the declutch lever.
• Do not force the declutch lever into motor operation position. Lever returns to this position automatically when motor is energized.
• Do not run “plug” type valve against stop.
• Do not alternately start/stop the motor to open or close a valve that is too tight for normal operation.
6.1 Electrical Start-Up
1. Verify that the actuator has been correctly lubricated. This is particularly important if the actuator
has been in long-term storage.
2. Verify that the geared limit switch has been correctly set per Section 5.5.1, Setting Limit Switch.
3. If the valve stem is not visible, remove the stem cover or handwheel cover plate to observe the
output direction of the drive sleeve.
4. Engage manual operation and hand crank the valve well away from end-of-travel positions.
5. Turn on power supply and push the “open” button on the pushbutton station.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
6. Check output rotation:
• If phase rotation is correct, the valve should begin to open.
• If valve begins to CLOSE, STOP IMMEDIATELY. Incorrect phase rotation will lead to serious
damage if the valve seats.
NOTE: For UEC only – if incorrect rotation, select opposite direction with dipswitch.
7. Correct the phase rotation one of two ways:
• switch any two of the three power leads for three-phase power, or
• reverse the armature leads for DC power.
The actuator should operate correctly and will be stopped at the end-of-travel positions by torque or
limit switch functions.
Premature stopping may be caused by incorrect limit switch or torque switch settings or obstructions in
the valve.
6.1.1 Typical Wiring Diagram
Figures 9.1 through 9.4 are representations of typical applications and may not be applicable to
your specific actuator. Please refer to the wiring diagram supplied with your actuator to confirm the
actual equipment supplied. Check www.limitorque.com for the latest diagram revisions and/or related
diagrams.
22
6.2 Manual Operation
Piece numbers refer to Figures 8.1, 8.2, and 8.3 for L120-190 and -420, Figures 8.4, 8.5, and 8.6 for
L120-800, and Figures 8.7 - 8.10 for L120-2000.
The actuator has a handwheel for manual operation. The actuator may be manually operated any time
the motor is not engaged.
Manually operate as follows:
1. Move the Declutch Lever (piece #10, #11) in the direction of the arrow until it latches into place. Do
not force the lever.
2. If the lever will not latch, rotate the Handwheel (piece #5) while turning the declutch lever and the
lever will latch in place.
When the declutch lever is turned, it rotates a Cam which causes the Clutch Fork (piece #42-1) to move
the Worm Shaft Clutch (piece #33) axially along the worm shaft against the force of a Clutch Spring
(piece #45, #46). This disengages the mating lugs on the Worm Shaft Gear (piece #32) and the clutch,
and engages the clutch with the Handwheel Gear (piece #17, #9). The Clutch Trippers (piece # 34-A
and 34-B) maintain this position and latch onto the worm shaft gear. Turning the Handwheel (piece #5)
rotates the Handwheel Shaft (piece #18) and the Handwheel Pinion. The handwheel pinion then drives
the Handwheel Gear (piece #8, #9) which in turn drives the clutch. The clutch then drives the actuator in
the same manner as in motor operation.
When the motor is energized, the motor pinion will turn the worm shaft gear. Tripper cams mounted
on the worm shaft gear cause the trippers to release the clutch. The Clutch Fork (piece #42-1) is then
forced, under spring pressure, to return the clutch to the motor operation position.
NOTE: The shift from manual operation to motor operation is automatic and does not require external
positioning of the declutch shaft.
Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
6.3 Motor Operation
The actuator is always available for motor operation whenever the motor is energized.
a CAUTION: Do not force the declutch lever into motor operation. Lever will automatically return
to motor operation when the motor is energized.
Reset the travel limit switches prior to motor operation if the actuator has been dismantled or removed
from the valve. Piece numbers refer to Figures 8.1, 8.2, and 8.3 for L120-190 and -420, and Figures 8.4,
8.5, and 8.6 for L120-800.
In motor operation, the Motor Pinion (piece #31) drives the Worm Shaft Gear (piece #32), which drives
the Worm Shaft Clutch (piece #33) through the clutch lugs on both the worm shaft gear and the clutch.
The Worm Shaft (piece #17) is driven by splines on the OD of the worm shaft and on the ID of the
clutch. The worm shaft is splined to the Worm (piece #30-1) which drives the Worm Gear (piece #13).
Two lugs on the worm gear are engaged by matching grooves in the Drive Sleeve (piece #8). This
arrangement provides the no-lost-motion mode of operation and allows the worm gear to turn the
drive sleeve. The worm gear lugs may also be oriented outside the grooves to give the lost-motion
or hammerblow effect. The Stem Nut (piece #12) is rotated by internal splines on the ID of the drive
sleeve and external splines on the OD of the stem nut. This causes a threaded stem to translate in a
threaded stem nut and a keyed shaft to rotate in a keyed stem nut. Thrust is absorbed by Bearings
(piece #40, #41, #14, and #67 ) located at the top and bottom of the drive sleeve.
6.4 Torque and Travel Limiting
Unless otherwise stated, piece numbers refer to Figures 8.1, 8.2, and 8.3 for L120-190 and -420, and
Figures 8.4, 8.5, and 8.6 for L120-800.
The Geared Limit Switch (piece #305 of Figure 8.6) is driven directly by the worm shaft gear through the
limit switch pinion. Thus, the limit switch is directly connected to the output of the actuator and, once
properly set, remains in step with the valve position regardless of the electric or manual operation of the
actuator.
As the actuator increases torque, the worm and the Torque Spring Cartridge Assembly
(composed of piece #'s 16-1 through 16-8) move axially along the worm shaft, compressing the disk
spring packs. The torque spring assembly is calibrated such that a finite spring compression relates to
a finite output torque. Axial worm movement causes movement of the bearing cartridge that is geared
to the Torque Switch (piece #300). The torque switch is graduated and adjustable so it may be set to
interrupt power to the motor at a predetermined output torque level.
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7
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Maintenance
7.1 Lubrication
The L120 series actuators have a totally sealed gear case, factory-lubricated with grease. The gear case
can be mounted in any position.
a CAUTION: When the actuator is mounted in an upside-down orientation, the worm may not be
completely immersed in lubricant. Check lubricant levels before operating the actuator.
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 of lubricant is weeping at
start-up, remove it with a clean cloth. Once the equipment is operating on a regular basis, the weeping
should stop.
7.1.1 Lubrication Inspection
Inspect Limitorque L120 series actuators for correct lubrication prior to operating—particularly
following a long storage period.
Each application has its own effect on the actuator. The frequency of these inspections should be based
on the application and the operating experience. The following lubrication inspection schedule is recommended until operating experience indicates otherwise.
For Gear Case, inspect lubrication every 18 months or 500 cycles, whichever occurs first.
24
During an inspection, consider the following:
• Quantity – Ensure there is enough lubricant so that the Worm and the Worm Gear are totally
immersed in grease regardless of the position.
• Quality – Inspect lubricant for dirt, water or other foreign matter. If any one of these is found:
1. Flush the actuator with a commercial degreaser/cleaner such as Exxon Varsol #18. This
degreaser/cleaner is not corrosive and does not affect the seal materials.
2. Repack the actuator with fresh lubricant, allowing room for grease thermal expansion.
Limitorque
• Consistency – Ensure the lubricant is fluid approximating a standard NLGI-0 grade consistency or
less. Thinners such as Amoco WAYTAC #31 oil may be added provided the volume of thinner does
not exceed 20% of the total lubricant.
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
7.1.2 Factory Lubricant
Gear Case
• The L120-190 through 2000 is factory-lubricated with an NLGI Grade 00 lithium-base grease, suitable
for temperatures from 0°F to 225°F (-18°C to 107°C).
Geared Limit Switch
• Mobil 28 (No Substitute)
Table 7.1 – Lubricant Weights
Actuator Sizelb.kg
L120-190155.6
L120-4205018.7
L120-800 Drive 17126.5
L120-800 Drive 27528
L120-2000 Drive 16524.3
L120-2000 Drive 27226.9
Minimum Lubricant Qualities Required
The standard lubricants used by Limitorque have been proven to be extremely reliable over years of
service. Limitorque does not recommend a particular lubricant substitute for the standard lubricants;
however, Limitorque does require the following lubricant qualities as a minimum.
a CAUTION: Do not mix lubricants of a different base chemical. Mixing lubricant bases may cause
lubricant properties to be ineffective.
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.
• Comply with a slump-prefer NLGI-00 grade.
• Not be corrosive to steel gears, ball, or roller bearings.
• Have a dropping point above 316°F (158°C) for temperature ranges of 0°F to 225°F (-18°C to 107°C).
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8
Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Disassembly and Reassembly
c WARNING: See sections 5.1 and 5.2 Safety Precautions and Safety Practices prior to
disassembly.
c WARNING: Potential High Pressure Vessel. Before removing or disassembling your actuator,
ensure that the valve or other actuated device is isolated and is not under pressure.
a CAUTION: Turn off all power services before attempting to perform service on the actuator.
NOTE: Remove the actuator from the valve for complex work. Minor work, such as replacing geared
limit switch, torque switch or motor, may be readily performed while the actuator is still on the valve.
8.1 L120-190, -420, and -800
c WARNING: See sections 5.1 and 5.2 Safety Precautions and Safety Practices prior to
disassembly.
NOTE: The disassembly of the actuator L120–190 will be used as a general example. Always refer
to the parts drawing when disassembling. Be certain to keep all parts clean and free from dirt after
disassembly.
NOTE: Unless otherwise noted, piece numbers refer to Figures 8.1, 8.2 and 8.3 for L120-190 and -420,
and Figures 8.4, 8.5 and 8.6 for L120-800.
26
8.1.1 To Replace Stem Nut Only
c WARNING: Do not remove Locknut (piece #39) with actuator under load or with valve under
pressure. See Warning on Step No. 11 of Section 8.1.2 L120-190, 420, 800 Disassembly.
NOTE: If the valve must be left in service while the stem nut is replaced, the valve stem must be locked
in such a way as to prevent any movement of the valve stem.
Limitorque
Piece numbers refer to Figures 8.1, 8.2 and 8.3 for L120-190 and -420, and Figures 8.4, 8.5 and 8.6 for L120-800.
If the Stem Nut (piece #12) is to be removed from the assembled actuator, remove the Lock Nut (piece #39) and
lift out top of nut.
1. The Lock Nut (piece #39) is staked in two places. Locate the stakes and spot with a drill.
2. Clean all metal particles and remove.
3. If the actuator is mounted on a valve having a threaded stem, and removal of the stem nut is required,
perform Step No.1 and rotate the handwheel to close the valve.
4. The stem nut will rise up the threaded valve stem. When the stem nut splines are free from the drive sleeve,
rotate the stem nut by hand the remaining length of the valve stem.
5. Replace if necessary.
6. Install the new stem nut with the lock nut.
7. Stake the top threads of the lock nut in two places.
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
8.1.2 L120-190, 420, 800 Disassembly
Piece numbers refer to Figures 8.1, 8.2 and 8.3 for L120-190 and -420, and Figures 8.4, 8.5 and 8.6 for L120-800.
1. Turn off power to the actuator.
2. Open or remove electrical Compartment Cover (piece #200-1).
3. Disconnect all electrical leads from the Torque Switch (piece #300) and Geared Limit Switch (piece #305).
Ensure that all leads and terminals are clearly marked to facilitate reassembly.
4. Remove two screws holding limit switch and one holding torque switch. Remove both items.
5. Remove four bolts holding Motor (piece #124) and three bolts holding conduit Nipple Flange (piece #26).
Remove motor, drawing motor leads through the conduit opening.
6. Replace Motor Pinion (piece #31). The motor pinion is keyed to the motor shaft and held there with a
setscrew and lockwire to retain the pinion in its proper position. The motor pinion should be shouldered on
the motor shaft.
7. Remove Handwheel (piece #5) by loosening setscrew. Handwheel can then be pulled from Handwheel Shaft
(piece #18).
8. Remove Declutch Lever Subassembly (piece #11) by removing Extension Spring (piece #48), Retaining Ring
(piece #53-4), Declutch Link (piece #10), and two hex head cap screws holding the subassembly in place.
Remove subassembly.
9. Remove Spring Cartridge Cap (piece #4).
10. Remove Worm and Torque Spring Subassembly (piece #13, #30-1) completely. Temporarily replace the
handwheel and then rotate in the close direction to cause the worm to screw out of engagement with worm
gear and cause the torque spring cartridge to emerge from Housing (piece #1). See Step No. 21 to further
disassemble the cartridge.
11. Remove Housing Cover (piece #3).
c WARNING: Do not remove if a thrust load is on the actuator or if the valve is under pressure and not fully
open, as personal injury may result.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
12. Lift complete drive sleeve assembly from actuator housing. The drive sleeve assembly consists
of Lock Nut (piece #39), Stem Nut (piece #12), Drive Sleeve (piece #8), Upper Thrust Bearings
(piece #40, #67), Worm Gear (piece #13), Worm Gear Spacer (piece #36) and Lower Thrust Bearing
(piece #14). The drive sleeve assembly may be further dismantled if required by pressing off Lower
Drive Sleeve Bearing (piece #41).
13. Remove Retaining Ring (piece #53-1), Split Ring Retainer (piece #27) and Conduit Nipple
(piece #26). Pull the Worm Shaft Clutch Gear (piece #32) from the worm shaft.
14. Spread clutch trippers with a tool to shift actuator into motor operation.
c WARNING: Do not use hands as spring forces could result in personal injury.
15. Remove bolts holding Declutch Housing (piece #2) to Housing (piece #1). Remove clutch housing,
Trippers (piece #34-A and #34-B), and Clutch Fork Assembly (piece #42-1). Worm Shaft Clutch
(piece #33) will slide off worm shaft when removing clutch housing.
16. Slide Clutch Spring (piece #45) off worm shaft toward motor end.
17. Remove Elastic Stop Nut (piece #16-7). Pull Handwheel Spur Gear (piece #9) that is keyed to Shaft
(piece #17).
18. Remove bolts holding WS Bearing Cap (piece #7) and slide cap off wormshaft. Remove Handwheel
Clutch Pinion (piece #20) from bearing cap by removing Retaining Ring (piece #53-3). Be careful
not to lose Handwheel Pinion Spring (piece #47) and Spring Ring (piece #49).
19. Remove Handwheel shaft: tap on the motor end of the shaft to free Ball Bearing (piece #52-1) from
housing. Handwheel shaft will break free from Ball Bearing (piece #52-6). Remove handwheel shaft
from housing.
20. Withdraw handwheel shaft from handwheel end of housing.
21. To disassemble worm assembly further (removed in Step No. 10), remove Elastic Stop Nut
(piece #16-7), noting the number of turns to remove.
22. Remove Thrust Washers (piece #16-2), Limit Sleeve (piece #16-5), and Belleville Disc Springs
(piece #16-3 and #16-4). Note the orientation of the discs for reassembly later.
23. Remove Retaining Ring (piece #53-4).
24. The Bearing Cartridge (piece #16-1) and Worm Subassembly (piece #30-1) can now be withdrawn.
25. Remove the Ball Bearing (piece #52-7), locate setscrew in bearing locknut and remove setscrew
and Locknut (piece #44-1).
8.1.3 Reassembling Actuator Sizes L120-190, -420 and -800
1. Follow the disassembly instruction for Actuator Sizes 190, 420, and 800 in the reverse order and
follow the gasketing instructions below.
28
2. Stack Belleville disc, thrust washers, and spacers that were removed in the exact order as they were
removed.
3. Re-install Elastic Stop Nut (piece #16-7) with the same number of turns used to remove.
4. For the Worm Shaft Clutch (piece #33), install the clutch with smaller set of lugs first to engage with
lugs on Handwheel Clutch Pinion (piece #20).
Limitorque
5. For worm, rotate Worm Shaft Clutch (piece #33) to engage splines on worm shaft. Place actuator
in manual operation, replace Declutch Lever Subassembly (piece #11), and handwheel temporarily;
rotate handwheel in opposite direction used to remove worm.
6. When re-installing the Motor Pinion (piece #31), ensure it fits tightly on the motor shaft (preferably
a light press fit).
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
8.1.4 Gaskets
All gaskets, except the housing cover gaskets, are 1⁄32" thick Anchorite. The housing cover gaskets
vary in thickness. Determine the correct size as follows:
1. Clean both housing cover and main housing gasketed surface.
2. Install actuator drive sleeve assembly complete with bearings.
3. Install housing cover and measure the gap between the housing cover and the main housing.
4. Add 10% to the measurement. Use the closest nominal gasket thickness or combination available.
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Figure 8.1 – L120-190 and -420 Drive Sleeve Side View (Refer to Table 8.1 for parts list)
6160
61-1
6466
6365
55-1
356-3
39
54-4
55-2
55-5
38
154-312
55-11
30
37
40
67
8
54-7
Drawing 01-608-0115-4
13
364114
Limitorque
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
Figure 8.2 – L120-190-and 420 Worm Shaft Side View (Refer to Table 8.1 for parts list)
55-52Socket Head Cap Screw571O-Ring Spacer (L120-190)
55-6variousHex Head Cap Screw (L120-190, 420)581Tripper Spring
55-7variousLockwasher601Terminal Bracket
55-82Drive Screw612Terminal Strip
55-94Hex Head Cap Screw61-12Kulka Insulator Strip
55-104Lockwasher632Fil HD Mach Screw
55-112Lockwasher (L120-190)642Lockwasher
56-2variousPipe Plug658RD HD Mach Screw
56-31Grease Fitting668Lockwasher
56-51Clevis Pin671Upper Thrust Bearing Cone
56-61Key682Fork Spacer (L120-420, 800)
56-71Key691Handwheel Bearing Cap (L120-420, 800)
56-81Key701Hinge
56-91Socket Head Set Screw70-1variousHex Head Cap Screw
56-101Key70-2variousLockwasher
56-111Flat Washer (L120-190)711Hinge Standard Compartment
56-111Socket Head Set Screw (L120-420, 800)1241Motor
56-121Flat Washer1821Handwheel Spinner Kit
56-131Socket Head Set Screw200-11Limit Switch Compartment Cover (L120-190, 420)
56-141Key200-2variousHex Head Cap Screw (L120-190, 420)
56-15variousSocket Head Cap Screw200-3variousLockwasher (L120-190, 420)
56-18variousSocket Head Cap Screw2041M.D.P.I. Sight Glass
56-191Socket Head Set Screw3001Torque Switch
56-204Socket Head Set Screw3051Geared Limit Switch
56-214Lockwasher3101Mechanical Dial Position Indicator
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
8.2 L120-2000
c WARNING: See sections 5.1 and 5.2 Safety Precautions and Safety Practices.
NOTE: The L120-2000 Drive 2 is a thrust-type actuator consisting of an L120-2000 Drive 1 torque-type
actuator mounted on a thrust bearing assembly. For torque-only actuators see Section 8.2.2, Drive 1
Disassembly (Torque Housing).
NOTE: Piece numbers refer to Figures 8.7 - 8.10.
8.2.1 Drive 2 Disassembly (Thrust Housing Only)
c WARNING: Before proceeding, ensure that the actuator is not under load and that the valve is
not under pressure. If so, the valve must be in fully open position.
Remove Drive Sleeve Locknut (piece #130):
1. Rotate handwheel to close valve, causing the Stem Nut (piece #127) to rise up threaded valve stem
until the stem nut splines are free of Drive Sleeve (piece #126).
2. Rotate stem nut by hand for the remaining length of the valve stem and remove.
Remove Thrust Adapter (piece #125):
NOTE: If disassembly of thrust adapter assembly is not required, continue to Section 8.2.2, Drive 1
(Torque Actuator), Step No. 1.
1. Remove Seal Retainer Plate (piece #129) and Oil Seal (piece #54-6).
2. Loosen setscrew and remove Thrust Bearing Cartridge (piece #128) from the Thrust Adapter
Housing (piece #125).
2. Disconnect motor leads, Torque Switch (piece #301) leads, and Geared Limit Switch (piece #305)
leads.
NOTE: Ensure leads are labeled for reassembly.
38
3. Remove screws holding Limit Switch and holding Torque Switch. Remove both items.
4. Remove bolts holding Motor.
5. Remove Motor Adapter (piece #22) and Motor Adapter Gasket (piece #105). Remove motor gear
shims from the motor adapter bearing bores and store in a safe place.
6. Remove Intermediate Pinion (piece #32-1) and the Drive Shaft Gear (piece #32-2).
7. Remove torque switch and geared limit switch.
Limitorque
8. Using lifting eyebolts, remove Housing Cover (piece #3), Drive Sleeve (piece #8), and Worm Gear
(piece #13).
9. Remove Handwheel Washer (piece #88). Pull off Handwheel (piece #5) and Handwheel Clutch
(piece #83) from Handwheel Shaft (piece #18).
10. Remove Worm Shaft End Cap (piece #4) and Declutch Housing Cover (piece #86).
11. Remove Declutch Assembly:
A. Remove Declutch Lever Stop (piece #93), Tripper Spring (piece #58), Clutch Trippers
(piece #34-A and #34-B) and Roll Pin (piece #19-7).
B. Loosen setscrews on Declutch Lever (piece #11) and Hallowell Collar (piece #56-8). Remove
declutch lever, Declutch Shaft and Cap (piece #95), and slide Declutch Shaft (piece #19-1) out
through bottom of actuator.
C. Remove Declutch Lever (piece #11), and other Declutch Shaft-Mounted Components
(piece #19-2, #91, #92, and #56-8).
D. Remove Handwheel Shaft and Pinion (piece #18).
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
12. Remove Drive Shaft (piece #77) and Flexible Jaw Clutch (piece #82-1) as integral assembly.
Remove Gear Clutch Spacer (piece #78), Sliding Gear Clutch (piece #33), and Clutch Compression
Spring (piece #46).
13. Remove Splined Insert (piece #87) using jack screws. Remove Spirolox Ring (piece #53-3) and
Handwheel Gear (piece #9).
14. Remove Gear Mounting Bracket (piece #84) using jack screws, Bearing (piece #52-7), and Bearing
Adapter (piece #79).
15. Pull Hollow Drive Shaft (piece #17) toward declutch end and remove Spirolox Ring (piece #53-8).
16. Remove Declutch Housing (piece #2).
17. Remove Hollow Drive Shaft (piece #17):
A. Push hollow drive shaft toward motor end. Loosen setscrew and remove Bearing Locknut
(piece #80-1) – hold hollow drive shaft using adjustable spanner on splines.
B. Remove Bearing (piece #52 -8) by pushing hollow drive shaft toward declutch end.
C. Remove Gear Limit Thread Collar (piece #76) and key.
D. Remove hollow drive shaft from declutch end of actuator.
18. Loosen setscrew in Cartridge Stem Locking Nut (piece #16-10) and replace Declutch Housing
(piece #2) with two screws to compress torque spring.
19. Remove Locking Nut (piece #16-10).
a CAUTION: Declutch Housing is under spring load.
20. Remove Declutch Housing (piece #2):
A. Pull Bearing Cartridge Stem (piece #16-8) out partially.
B. Remove Thrust Washers (piece #16-2), Torque Limit Sleeve (piece #16-5) and Springs
(piece #16-3).
39
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
21. Remove bearing cartridge/worm assembly from actuator. To disassemble further:
A. Loosen two setscrews on Bearing Cartridge Cap (piece #16-1), and unscrew Bearing Cartridge
Stem (piece #16-8).
B. Slide bearing cartridge cap off toward worm threads.
C. Loosen setscrew and remove Bearing Locknut (piece #44-1).
D. Press off two Bearings (piece #73).
8.2.3 Drive 1 (Torque Housing) Reassembly
1. Press two Bearings (piece #73) onto worm. It may be necessary to apply heat to the bearings.
Ensure that the bearing spacer is installed.
2. Install Bearing Lock Nut (piece #44-1) and tighten screw.
3. Apply head to Bearing Cartridge Cap (piece #16-1) and drop on bearing from worm end. Ensure that
cartridge cap seats on bearing.
4. Install bearing cartridge/worm assembly in housing.
5. Replace the following in the order listed:
A. Thrust Washer (piece #16-2)
B. Belleville Springs (piece #16-3)
C. Torque Limit Sleeve (piece #16-5)
D. Thrust Washer (piece #16-2)
Ensure flat side of thrust washer is against springs.
18. Install Drive Shaft (piece #77), ensuring that Gear Clutch Spacer (piece #78) is in place. Align
splines on drive shaft and drive shaft gear and push drive shaft into actuator from declutch end.
®
L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
19. Mount Bearing (piece #52-6 and #52-1) on Handwheel Shaft and Pinion (piece #18) and install
assembly into actuator.
20. Install Declutch Shaft (piece #19-1) and Torsion Spring (piece #94) into Declutch Cap (piece #95).
21. Install declutch shaft assembly through bottom of Declutch Housing (piece #2). Declutch shaft
assembly consists of:
• Declutch Shaft
• Declutch Shaft Washers (piece #91, 3 pieces)
• Torsion Spring
• Declutch Fork (piece #42-1)
• Declutch Cap
• Declutch Spacer (piece #92)
• Declutch Lever Drum (piece #19-3)
• Hallowell Collar (piece #56-8)
• Declutch Arm (piece #19-2)
NOTE: Declutch shaft must be installed with key seat facing right side of the declutch housing when
viewed from declutch end of actuator.
22. Fasten declutch cap.
23. Insert Roll Pin (piece #19-7) through declutch arm and shaft.
24. Ensure that declutch shaft bears against declutch cap, push collar against top of housing, and
tighten collar setscrew.
25. Ensure that Oil Seal (piece #54-8) is in place.
26. Install Declutch Lever (piece #11) and tighten setscrew.
27. Rotate declutch lever clockwise, hold in position, and install Declutch Lever Stop (piece #93).
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Limitorque® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
28. Install Clutch Tripper (piece #34-A, 34-B) and Tripper Spring (piece #58).
30. Ensure that Handwheel Oil Seal (piece #54-8) is in place.
31. Install Worm Shaft End Cap (piece #4) and Worm Shaft End Cap Gaskets (piece #54-2).
NOTE: Ensure that the same number of gaskets is installed as were removed during disassembly.
Thickness of gaskets must be sufficient to prevent end cap from bearing on drive shaft.
38. Connect motor leads and leads to torque switch and geared limit switch.
8.2.4 Drive 2 (Thrust Housing Only) Reassembly
1. If Thrust Adapter Assembly (piece #125) is not disassembled, go to Step No. 7.
NOTE: Thrust bearing races should be pressed on Thrust Drive Sleeve (piece #126), in Thrust
Adapter Housing (piece #125), and Thrust Bearing Cartridge (piece #128) prior to beginning
assembly procedure.
Limitorque Beijing, Pte., Ltd.
RM A1/A2
22/F, East Area, Hanwei Plaza
No. 7 Guanghua Road, Chaoyang District
Beijing 100004, Peoples Republic of China
Phone: 86-10-5921-0606
Facsimile: 86-10-6561-2702
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended
function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide
variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible applications. The
purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve products. The purchaser/user
should read and understand the Installation Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve
products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or as
a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this
product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice.
Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one of its worldwide operations or offices.