Leslie 35 Assembly instructions

1
DIAPHRAGM ACTUATOR
35(R), 55(R), 85(R), 135(R)
TABLE OF CONTENTS
SCOPE...............................................................................................................................................................................................2
INSTALLATION..............................................................................................................................................................................2
ASSEMBLE DIRECT (SPRING TO RETRACT)ACTUATOR TO EQUIPMENT ...........................................................................................2
ASSEMBLE REVERSE (SPRING TO EXTEND)ACTUATOR TO EQUIPMENT...........................................................................................2
SETTING ACTUATOR STROKE ..........................................................................................................................................................2
SETTING THE ACTUATOR SPRING LOAD ..........................................................................................................................................2
OPERATION....................................................................................................................................................................................3
MAINTENANCE..............................................................................................................................................................................3
GENERAL.........................................................................................................................................................................................3
DIRECT ACTUATOR DISASSEMBLY..................................................................................................................................................3
DIRECT ACTUATOR REASSEMBLY ...................................................................................................................................................3
DIRECT ACTUATOR HOD DISASSEMBLY.........................................................................................................................................4
DIRECT ACTUATOR HOD REASSEMBLY..........................................................................................................................................4
REVERSE ACTUATOR DISASSEMBLY .............................................................................................................................................10
REVERSE ACTUATOR REASSEMBLY...............................................................................................................................................10
REVERSE ACTUATOR HOD DISASSEMBLY....................................................................................................................................10
REVERSE ACTUATOR HOD REASSEMBLY .....................................................................................................................................11
TROUBLESHOOTING.................................................................................................................................................................16
ILLUSTRATION INDEX
FIGURE 1-DIRECT DIAPHRAGM ACTUATOR/HOD.............................................................................................................................6
FIGURE 2-EXTERNAL VIEW OF DIRECT ACTING DIAPHRAGM ACTUATOR .........................................................................................8
FIGURE 3-REVERSE DIAPHRAGM ACTUATOR/HOD........................................................................................................................12
FIGURE 4-DISENGAGING HANDSCREW DISC FROM NUT ..................................................................................................................13
FIGURE 5-EXTERNAL VIEW OF REVERSE ACTING DIAPHRAGM ACTUATOR.....................................................................................13
12501 Telecom Drive, Tampa Florida 33637
Installation, Operating and
Maintenance Instructions
Supplement
10/0.5.1
Rev. 1

2
SCOPE
The following instructions cover installation, operation and
maintenance of Leslie's diaphragm actuators.
INSTALLATION
Before starting installation of the actuator assembly, units
should be unpacked and checked against packing list and/or
the approved customer drawing.
1. Actuator is designed to be mounted in the vertical
position. For other than vertical installations piping
supports may be required. Consult factory.
Assemble Direct (Spring to
retract) Actuator to Equipment
1. Ensure that there is no spring tension on actuator by
"unscrewing" spring adjusting nut (35). (see Fig 1)
2. Connect air supply to the top of the actuator until the
stem is fully extended.
3. Ensuring that the thread size of the actuator and the
control valve stem (refer to Fig 2 dimension x) is the
same, and after lifting valve plug screw the actuator
onto the stem about 1 diameter of thread.
4. Remove air supply and secure actuator to equipment.
(NEED TO PUT BOLT TORQUE VALUES FOR
STUDS TO HOLD ACTUATOR DOWN)
5. See Stroke adjustments section for final setting of
actuator.
Assemble Reverse (Spring to
extend) Actuator to Equipment
1. Ensure that there is no spring tension on actuator by
"unscrewing" spring adjusting nut (40). (See Fig 3)
2. Ensuring that thread size of actuator and control valve
stem (refer to Fig 4 dimension x) is the same, and after
lifting valve plug screw actuator onto equipment about
1 diameter of thread.
3. Connect air supply to bottom of actuator and allow
actuator to come to rest on valve stem. Secure actuator
to stem.
4. See stroke adjustments section for final setting of
actuator.
Setting Actuator Stroke
1. Apply air to either bottom (Reverse) or top (Direct) of
actuator and note the total travel distance of actuator.
2. To adjust stroke of actuator, retract actuator stem by
removing air from actuator (Direct) or applying air to
actuator (Reverse). Screw equipment stem further into
actuator and then stroke actuator again.
3. Repeat step 2 until desired stroke is reached.
4. Secure Travel indicator (42) to actuator yoke (4) by
fastening screw (43) as shown. (See Fig 3)
Setting the Actuator Spring
Load
1. To adjust load given by failure mode
(Direct/Reverse) of actuator, first remove all air
pressure from actuator.
2. Hold actuator stem in place with a wrench.
3. Using a steel bar (see Table 1), turn spring
adjusting nut (40) one half turn. (See Fig 3)
4. Measure force output of spring to see if at desired
load. (This can be done by slowly applying air to
actuator and recording at what air pressure actuator
CAUTION!
All warnings and instructions from equipment IOM
that Actuator is mounted to must be followed.
CAUTION!
Keep all body parts away from any moving parts of
actuator to prevent injury/death. Since air is being
used to move actuator proper safety equipment (i.e.
safety glasses) must be worn. Actuator contains a
very powerful spring, extreme caution must be used
when operating actuator. When supplying air to
actuator do not exceed 60 psig.

3
starts to move. Take that air pressure and multiply
it by area of actuator (see Table 1) in order to
obtain the force output of spring.
5. Repeat steps 1-4 until desired load is reached.
Actuator Size Stroke
(in) Area (in
2
) Spring Adjustor Rod Dia. (in)
35 3/4 34
35R 3/4 31 3/4
55 1 57
55R 1 54 7/8
85 2 90
85R 2 87 0.745
135 3 135
135R 3 131 0.995
Table 1- Actuator Load Parameters
OPERATION
Once actuator stroke and spring load have been adjusted,
equipment can be placed into operation. Route air supply
from control system to actuator. Ensure that instrument air
is being used to operate actuator. See equipment instructions
for proper operation of assembly.
MAINTENANCE
General
1. Remove all air and accessories from actuator prior
to removal from equipment.
2. Support actuator prior to removing mounting bolts.
For reverse acting actuators apply air to top of
actuator before removing mounting bolts.
3. Remove actuator mounting bolts.
4. For direct acting actuators, air may need to be
applied to actuator before removing actuator from
equipment shaft. For reverse acting actuators, air
may need to be removed from actuator. Unscrew
actuator from equipment shaft by either spinning
actuator or unscrewing the shaft. (NOTE: If
actuator is mounted to a valve the valve shaft
must not be turned unless valve plug is lifted off
valve seat!)
5. Remove all air pressure from actuator and unload
spring tension by grasping actuator stem with a
wrench and unscrewing spring adjustment nut (40).
(see Fig 3)
6. Actuator is now ready for disassembly.
Direct Actuator Disassembly
(see Fig 1)
1. Remove nuts/bolts (22/23), upper diaphragm case
(20) and diaphragm (21).
2. To remove the other components, lift out
diaphragm disc (24) and entire diaphragm disc and
spring (28) assembly will lift out.
3. Unscrew diaphragm disc nut (16 only showing in
Fig 3) and remove springs (28,29) from the
assembly.
4. Remove spring adjustment nut (35).
5. Remove lower diaphragm case screws (26).
Direct Actuator Reassembly
(see Fig 1)
See Torque Values in Table 2
1. Install lower diaphragm case bolts (26) and torque
to the values given in Table 2.
NOTE
Spring loads will vary if the actuator is mounted on
equipment that does not fully utilize the entire stroke
length of the actuator.
CAUTION!
Spring load must be completely removed before
proceeding or injury/death can occur.
NOTE
Ensure that all the components being installed are free
from any nicks burrs or defects prior to assembly.

4
2. Install spring adjusting nut (35) and thread it all the
way down as shown.
3. Install springs (28,29).
4. Install diaphragm disc nut (16 only showing in Fig
3) and diaphragm disc (24). (See table 2)
5. Slide diaphragm plate/assembly into yoke (32) as
shown.
6. Install diaphragm (21) and align holes with those in
diaphragm case (For sizes 35, 55 and 85). For 135
actuators place the bead of diaphragm (21) in the
recess of lower diaphragm case (25).
7. For 35 actuators and where flat stock diaphragm
material is used as an emergency measure see
special "performing" instructions in step 8. Install
upper diaphragm case (20) and install (4) nuts and
bolts (22/23) (90
o
apart) and finger tighten. Install
remaining bolts and nuts and torque to the values
given in Table 2.
8. Special "Performing" Instructions - Flat stock
material is used for 35 diaphragms and emergency
measure diaphragms. First finger tightens all
diaphragm case bolts. Then compress actuator
spring sufficiently to move diaphragm through its
full travel. This performs diaphragm and permits
full movement through rated travel without
resistance from a taut diaphragm.
Act.
Size
(see
Fig 1)
Lower
Dia.
Casing
Bolts
(26)
Upper
Dia.
Casing
Bolts
(22,23)
35 15-20 15-20
55 30-36 15-20
85 30-36 15-20
135 45-50 15-20
Table 2 - Torque Values (ft-lbs)
Size 1 5 17
35 15-20 2-5 50-80
55, 55A,
85, 85A 15-20 2-5 50-80
135 30-36 2-5 50-80
Table 3 – Torque Values Hand Operating Device (ft-lbs)
Direct Actuator HOD
Disassembly
(see Fig 1)
1. Remove nut (1), lock washer (2), and handwheel
(3).
2. Remove packing gland (5), packing ring(s) (6),
washer (7), and O-Ring (8) from bonnet (9).
3. Screw handscrew (4) down into bonnet (9) until
stem bottoms on bonnet threads.
4. Remove handscrew disc (15) after removing
retaining ring and half rings above it.
5. Remove handscrew (4) through upper end of
bonnet (9).
Direct Actuator HOD
Reassembly
(see Fig 1)
1. Insert handscrew (4) in top of bonnet (9) and screw
down through bonnet threads.
2. Place retaining ring over handscrew thread. Insert
half rings in the handscrew groove with wide face
of rings upward toward bonnet (9). Install
handscrew disc (15) over half rings and fit retainer
ring into groove of disc making sure it enters
groove.
3. Screw handscrew (4) up through bonnet (9). Place
O-Ring (8) over handscrew (4) stem and into
bonnet (9) followed by washer (7) and packing
ring(s) (6). Screw packing gland (5) into bonnet (9)
and tighten sufficiently to prevent handwheel (3)
CAUTION!
Spring load must be completely removed
before proceeding or injury/death can occur.
NOTE
Ensure that all components being installed are free
from any nicks burrs or defects prior to assembly.

5
from turning due to vibration, etc. install bonnet (9)
on upper diaphragm case.
4. Place handwheel (3) over stem. Install lock washer
(2) and tighten nut (1).
5. Reinstall HOD assembly on actuator.

6
Figure 1 - Direct Diaphragm Actuator/ HOD

7
DIRECT ACTING PARTS LIST

8
Figure 2 - External View of Direct Acting Diaphragm Actuator

9
DIAPHRAGM ACTUATORS – DIRECT ACTING
DIMENSIONS IN INCHES AND MILLIMETERS NET WT. Lb/kg**SIZE
DIAPHRAGM
ACTUATOR
MAX
TRAV
EL J J-J L M N-1 N-2 N-3 P R S T U V W X Z ALUM. CAST
IRON
35 in
mm ¾ 19.0 9-1/4 235.0 3-15/16 100.0 12-3/8 314.3 12-3/8 314.3 6-1/4 158.8 2-1/2 63.5 2-1/2 63.5 5-1/2 139.7 1-3/8 34.9 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 11/16 17.5 3/8-24 ¼ NPT 20 lb 9.1 kg 35 lb 15.9 kg
55 in
mm 1-1/2 38.1 12 304.8 5-1/16 128.6 15-1/4 387.4 15-1/4 387.4 7 177.8 2-1/2 63.5 3 76.2 5-1/2 139.7 1-3/8 34.9 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1 25.4 3/8-24 ¼ NPT 23 lb 10.4 kg 50 lb 22.7 kg
55A in
mm 1-1/2 38.1 12 304.8 5-1/16 128.6 15-1/4 387.4 15-1/4 387.4 7 177.8 2-1/2 63.5 3 76.2 5-1/2 139.7 1-3/8 34.9 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1 25.4 ½-20 ¼ NPT 23 lb 10.4 kg 50 lb 22.7 kg
85 in
mm 2-1/8 54.0 14-3/4 374.7 6-1/4 158.8 19-5/8 498.5 19-5/8 498.5 8-1/2 215.9 2-1/2 63.5 4-1/8 104.8 6-7/16 163.5 1-3/4 44.5 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1-1/4 31.8 ½-20 ¼ NPT 43 lb 19.5 kg 96 lb 43.5 kg
85A in
mm 2-1/8 54.0 14-3/4 374.7 6-1/4 158.8 22-1/4 565.2 22-1/4 565.2 11-1/8 282.6 2-1/2 63.5 4-1/8 104.8 8-9/16 217.5 2-1/2 63.5 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ¾-16 ¼ NPT 48 lb 21.8 kg 116 lb 52.6 kg
85* in
mm 2-1/8 54.0 14-3/4 374.7 6-1/4 158.8 20-1/4 514.4 20-1/4 514.4 9-1/8 231.8 2-1/2 63.5 4-1/8 104.8 7-1/16 179.4 1-3/4 44.5 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ½-20 ¼ NPT 45 lb 20.4 kg 113 lb 51.3 kg
135 in
mm 3 76.2 18 457.2 9 228.6 27-3/8 695.3 24-5/8 625.5 11-1/8 282.6 2-1/2 63.5 5-5/8 142.9 8-9/16 217.5 2-1/2 63.5 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-15/16 33.3 ¾-16 3/8 NPT 104 lb 47.2 kg 187 lb 84.8 kg
135(1-1/4)
Dia. Stem in mm 3 76.2 18 457.2 9 228.6 27-3/8 695.3 24-5/8 625.5 11-1/8 282.6 2-1/2 63.5 5-5/8 142.9 8-9/16 217.5 2-1/2 63.5 5-3/4 146.1 11/16 17.5 7 177.8 4.500 114.3 1-5/16 33.3 ¾-16 3/8 NPT 104 lb 47.2 kg 187 lb 84.8 kg
DIMENSIONS IN INCHES AND MILLIMETERS
ACTUATOR
SIZE MAX TRAVEL N-1 N-2 N-3 P R S T U V W X NET WT**
Lb/kg
NET WT**
W/H.O.D.
lb/kg
270 (in)
270 (mm) 3 76.2 11-1/16 281.0 2-1/2 63.5 5-5/8 142.9 8-9/16 217.5 2-1/2 63.5 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ¾-16 NPT 210 lb 95.3 kg 225 lb 102.1 kg
Table 4 - Direct Acting Actuators Dimensions
*Mounting Flange Dimensions same as 135 ( R) Yoke.
** Approximate

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Reverse Actuator Disassembly
(see Fig 3)
1. Remove nuts/bolts (18,19), upper diaphragm case
(15) and diaphragm (20).
2. Insert (3/4, 7/8, 0.745, 0.995) in diameter rod
through the hole in Yoke (34) and actuator stem
(35) to prevent stem from rotating. NOTE: If this
step is not done then permanent damage will
occur to lower stem boot. For 35 actuator use a
wrench on wrench flats to prevent stem from
rotating.
3. Remove actuator stem nut (16), diaphragm disc
(17), diaphragm (20), and collar (22). Remove
actuator stem (35), springs (36,37), spring seat
(30), washers (38,39), spacer (33) for 135R, and
stem seal collar (31). Remove spring adjustment
nut (40).
4. Remove stem seal (29) as follows: In 35R, remove
capscrews (23) and disassemble lower diaphragm
disc (21) from yoke (34) and lift out stem seal (29).
In 55R and 85R, remove screws (28), seal ring (27)
and stem seal (29), then remove lower diaphragm
bolts, lower diaphragm case (21) and gasket (26).
For 135R, remove capscrews (23) and disassemble
lower diaphragm case (21) from yoke (34) and lift
out stem seal (29).
Reverse Actuator Reassembly
(see Fig 3)
1. Assemble spring adjusting nut (40) washer(s)
(38,39), spacer (33) for 135R, stem seal collar (31),
springs (36,37), and spring seat (30).
2. Position stem seal (29) on stem seal collar (31), in
sizes 55R, 85R, and 135R place bead of stem seal
in recess of stem seal collar.
3. In 35R actuators, install stem seal (29) and collar
(31) over actuator stem (35) in yoke (34). Install
lower diaphragm base (21) to yoke (34). Insert cap
screws (23) through holes in diaphragm lower case
(21) and stem seal (29) and tighten as described
below.
4. In 55R and 85R actuators, install stem seal (29)
and seal ring (27) and torque per Table 2. What
about the base plate?
5. In 135R actuator, install stem seal (29) and collar
(31) over actuator stem (35) in yoke (34). Install
lower diaphragm base (21) to yoke (34). Insert
studs and nuts (24) through holes in diaphragm
case (21) and stem seal (29) and tighten as
described below.
6. Pre-setting stem seal (55R, 85R & 135R) - Place
collar (22) on stem seal (29) making sure the bead
on stem seal enters recess in collar. Reassemble
diaphragm (20) over actuator stem (35). Fit center
hole in diaphragm around raised face of collar (22).
Replace diaphragm disc (17) and nut (16). Hold
actuator stem steady with rod through yoke and
stem or on wrench flats. Failure to do so may
result in stem seal failure. Then tighten nut.
Replace upper diaphragm case (15) and nuts/bolts
(18/19) and torque to requirements in Table 2.
7. Presetting stem seal 35R - Place collar (22) on stem
seal (29), assemble nut (16) to actuator stem (35)
and tighten. Then press actuator stem downward to
make stem seal move to taut position. Tighten
capscrews to the requirements of Table 2 and
remove nut (16).
Reverse Actuator HOD
Disassembly
(see Fig 3)
1. Remove nut (1), lockwasher (2), and handwheel
(3).
CAUTION!
Spring load must be completely removed
before proceeding or injury/death can occur.
CAUTION!
Spring load must be completely removed before
proceeding or injury/death can occur.
NOTE
Ensure that all components being installed are free
from any nicks burrs or defects prior to assembly.

11
2. Screw handscrew (4) into the bonnet as far as it
will go.
3. Remove nuts and bolts (18,19 see Fig 3) from
upper diaphragm case (14).
4. Lift diaphragm case (14) while moving the case to
one side so that handscrew disc assembly can be
disengaged from diaphragm nut (8) by passing it
through the slot in the diaphragm nut. (see Fig 4)
5. Remove handscrew (4) from bonnet (7).
NOTE: Clean all parts and replace any that are worn or
damaged.
Reverse Actuator HOD
Reassembly
(see Fig 3)
1. Insert handscrew (4) into bonnet (7) and screw
down through bonnet threads.
2. Insert diaphragm case (14) making sure that
handscrew disc assembly is engaged to diaphragm
nut (8). (see Fig 4)
3. Tighten nuts and bolts (18,19 see Fig 3) into upper
diaphragm case (14).
4. Screw handscrew (4) up through bonnet (7).
5. Place handwheel (3) over stem. Install lockwahser
(2) and tighten nut (1).
Act. Size (see
Fig 1) Lower Dia. Casing Bolts (23,24) Upper Dia. Casing Bolts (18,19)
35R 15-20 15-20
55R/55AR 30-36 15-20
85R/85AR 30-36 15-20
135R 45-50 15-20
Table 4 - Torque Values (ft-lbs)
Size 1 6
35R 15-20 3-5
55R/55AR 15-20 15-20
85R/85AR 15-20 15-20
135R 30-36 15-20
Table 5 – Torque Values Hand Operating Device (ft-lbs)
NOTE
Ensure that all components being installed are free
from any nicks burrs or defects prior to assembly.

12
Figure 3 - Reverse Diaphragm Actuator/ HOD

13
Figure 4 - Disengaging Handscrew Disc from Nut
Figure 5 - External View of Reverse Acting Diaphragm Actuator

14
DIAPHRAGM ACTUATORS – REVERSE ACTING
DIMENSIONS IN INCHES AND MILLIMETERS NET WT**ACTUATOR
SIZE MAX TRAVEL J L M J-J N N-2 N-3 P R S T U V W X Z IRON ALUM.
35R in
mm ¾ 19.0 9-1/4 235.0 12-3/8 314.3 9-7/8 250.8 3-15/16 100.0 6-1/4 158.8 2-1/2 63.5 2-1/2 63.5 4 101.6 1-3/4 44.5 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 11/16 17.5 3/8-24 ¼ NPT 30 lb 15.9 kg 20 lb 9.1 kg
55R in
mm 1-1/2 38.1 12 304.8 18 457.2 14-1/4 362.0 5-1/16 128.6 6-7/8 174.6 2-1/2 63.5 3 76.2 4 101.6 1-3/4 44.5 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1 25.4 3/8-24 ¼ NPT 60 lb 27.2 kg 30 lb 13.6 kg
55AR in
mm 1-1/2 38.1 12 304.8 18 457.2 14-1/4 362.0 5-1/16 128.6 6-7/8 174.6 2-1/2 63.5 3 76.2 4 101.6 1-3/4 44.5 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1 25.4 ½-20 ¼ NPT 60 lb 27.2 kg 30 lb 13.6 kg
85R in
mm 2-1/8 54.0 14-3/4 374.7 23-1/4 590.6 18-3/4 476.3 6-1/4 158.8 8-9/16 217.5 2-1/2 63.5 4-1/8 104.8 4-5/16 109.5 2-1/4 57.2 3-13/16 96.8 9/16 14.3 4-13/16 122.2 2.687 68.2 1-1/4 31.8 ½-20 ¼ NPT 117 lb 53.1 kg 54 lb 24.5 kg
85R* in
mm 2-1/8 54.3 14-3/4 374.7 23-7/8 606.4 19-3/8 492.1 6-1/4 158.8 9-3/16 233.4 2-1/2 63.5 4-1/8 104.8 4-15/16 125.4 2-1/4 57.2 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ½-20 ¼ NPT 120 lb 54.4 kg 56 lb 25.4 kg
85AR in
mm 2-1/8 54.0 14-3/4 374.7 25-7/8 657.2 21-3/8 542.9 6-1/4 158.8 11-1/8 282.6 2-1/2 63.5 4-1/8 104.8 5-9/16 141.3 3-1/8 79.4 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ¾-16 ¼ NPT 123 lb 55.8 kg 59 lb 26.8 kg
135R in
mm 3 76.2 18 457.2 32-1/4 819.2 28-3/8 720.7 9 228.6 11-1/8 282.6 2-1/2 63.5 5-5/8 142.9 5-9/16 141.3 3-1/8 79.4 4-3/4 120.7 11/16 17.5 6 153.4 3.500 88.9 1-5/16 33.3 ¾-16 3/8 NPT 197 lb 89.4 kg 155 lb 70.3 kg
135R
(1-1/4) in mm 3 76.2 18 457.2 32-1/4 819.2 28-3/8 720.7 9 228.6 11-1/8 282.6 2-1/2 63.5 5-5/8 142.9 5-9/16 141.3 3-1/8 79.4 5-3/4 146.1 11/16 17.5 7 177.8 4.500 114.3 1-5/16 33.3 ¾-16 3/8 NPT 197 lb 89.4 kg 155 lb 70.3 kg
DIMENSIONS IN INCHES AND MILLIMETERS
ACTUATOR
SIZE MAX TRAVEL N-1 N-2 N-3 P R S T U V W X NET WT**
Lb/kg
NET WT**
W/H.O.D.
lb/kg
270R (in)
270R (mm) 3 76.2 11-1/8 282.6 2-1/2 63.5 5-5/8 142.9 5-9/16 141.3 3-1/8 79.4 4-3/4 120.7 11/16 17.5 6 152.4 3.500 88.9 1-5/16 33.3 ¾-16 NPT 288 lb 130.6 kg 300 lb 136.1 kg
Table 5 - Reverse Acting Actuators Dimensions
*Mounting Flange Dimensions same as 135 ( R) Yoke.
** Approximate

15
REVERSE ACTING PARTS LIST

16
TROUBLESHOOTING
Problem Possible Cause
Equipment not shutting off or it does not appear
to be enough force when air is removed from the
actuator.
Not enough spring load. Check the spring load by following section
on "Setting the Actuator Spring Load".
When air is supplied to the actuator the actuator
is not fully stroking or giving enough load. Check air supply pressure to the requirements of the initial actuator sizing. Check for seal leakage by using a "leak detect solution". Make
sure you also check the stem boot seal for reverse acting actuators.
Replace seals as necessary.
When air is removed from the actuator the
actuator does not return to either the open or
closed position.
Check for blockage in equipment. Check for a broken spring.
An air control signal is being sent to the actuator
but the actuator does not fully stroke? Check the bench range of the actuator by reviewing the original specifications for the actuator.
Actuator does not move smoothly Check that valve packing is not over tightened. Check that spring is not
rubbing on sides of spring case.

17
It is solely responsibility of system designer and user to select products and materials suitable for their specific
application requirements and to ensure proper installation, operation and maintenance of these products. Assistance
shall be afforded with selection of materials based on technical information supplied to Leslie Controls Inc.; however,
system designer and user retain final responsibility. Designer should consider applicable Codes, material
compatibility, product ratings and application details in selection and application. Improper selection, application or
use of products described herein can cause personal injury or property damage. If designer or user intends to use
product for an application or use other than originally specified, he must reconfirm tat selection is suitable for new
operating conditions. Life expectancy for this product defaults to warranty period of sales contract.