Nexen STC600 User manual

FORM NO. L-20294-G-0818
1
Tension Control Brakes
STC600 and STC940
AIR CHAMPPRODUCTS

2
FORM NO. L-20294-G-0818
Copyright 2018 Nexen Group, Inc.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
This document is the original, non-translated, version.
Conformity Declaration: In accordance with Appendix II B of CE Machinery Directive (2006/42/EC):
A Declaration of Incorporation of Partly Completed Machinery evaluation for the applicable EU directives was
carried out for this product in accordance with the Machinery Directive. The declaration of incorporation is set
out in writing in a separate document and can be requested if required.
This machinery is incomplete and must not be put into service until the machinery into which it is to be
incorporated has been declared in conformity with the applicable provisions of the Directive.
Read this manual carefully before installation and operation.
Follow Nexen’s instructions and integrate this unit into your
system with care. This unit should be installed, operated and
maintained by qualified personnel ONLY. Improper installation
can damage your system, cause injury or death. Comply with
all applicable codes.
DANGER
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this manual
are subject to change without notice. Technical data listed in this manual are based on the latest information available at
the time of printing and are also subject to change without notice.
Technical Support: 800-843-7445
[phone]
www.nexengroup.com

FORM NO. L-20294-G-0818
3
Table of Contents
General Specifications -------------------------------------------------------------------------------------------------------------------------- 4
General Safety Precautions ------------------------------------------------------------------------------------------------------------------- 4
Installation ------------------------------------------------------------------------------------------------------------------------------------------- 5
Lubrication ------------------------------------------------------------------------------------------------------------------------------------------- 5
Air Connections ----------------------------------------------------------------------------------------------------------------------------------- 6
Operation -------------------------------------------------------------------------------------------------------------------------------------------- 7
Troubleshooting ------------------------------------------------------------------------------------------------------------------------------------ 8
Friction Facing Replacement ----------------------------------------------------------------------------------------------------------------- 9
Parts Replacement:
Disassembly --------------------------------------------------------------------------------------------------------------------------------- 10
Pilot Bearing and Facing Replacement ----------------------------------------------------------------------------------------------- 12
Reassembly ---------------------------------------------------------------------------------------------------------------------------------- 14
Warranty -------------------------------------------------------------------------------------------------------------------------------------------- 17

4
FORM NO. L-20294-G-0818
GENERAL SPECIFICATIONS
GENERAL SAFETY PRECAUTIONS
CAUTION
Use lifting aids and proper lifting
techniques when installing, removing,
or placing this product in service.
CAUTION
Watch for sharp features when
interacting with this product. The parts
have complex shapes and machined
edges.
WARNING
This product is capable of emitting
a spark if misused, therefore it is not
recommended for use in any explosive
environment.
Specifications
Torque Up to 327 Nm (2900 in-lbs)
Actuation Pressure 1 - 5.5 bar (14.5 - 80 psi)
Service Temperature 4.5 - 104 C (40 - 220 F)
Approximate Weight Up to 25 kg (54 lbs)
CAUTION
Use appropriate guarding for moving
components. Failure to guard could
result in serious bodily injury.
WARNING
Ensure proper guarding of the product is
used. Nexen recommends the machine builder
design guarding in compliance with OSHA 29
CFR 1910 “Occupational Safety and Health
Hazards”.
CAUTION
This product has possible pinch
points. Care should be taken when
interacting with this product.
CAUTION
This product has possible pinch
points. Care should be taken when
interacting with this product.
CAUTION
The temperature limits for the
product are 4.5-104 degree
Celsius (40-220 degree F).
CAUTION
Use appropriate guarding for moving
components. Failure to guard could
result in serious bodily injury.

FORM NO. L-20294-G-0818
5
NOTE
Two 3/8-16 tapped holes at 180° are provided in the Piston
Guide for securing the STC to the machine frame (See
Figure 1).
INSTALLATION
Refer to Figure 1.
1. Install the customer supplied sheave onto the Pilot Mount
Drive Disc of the STC.
2. Insert the Nexen supplied Key (Item 30) into the shaft and
slide the STC onto the shaft.
3. Install and tighten the two Nexen supplied Set Screws (Item
29).
Customer
supplied
sheave
STC
Set Screw
(Item 29)
Key
(Item 30)
FIGURE 1
3/8-16
tapped
hole
NOTE
Nexen pneumatically actuated devices require clean, pressure regulated air for maximum performance and life.
All seals in Nexen Pneumatically operated devices are lubricated for life and do not require additional lubrication.
However, some customers prefer to use an air line lubricator, which injects oil into the pressurized air, forcing an
oil mist into the air chamber. This is acceptable, but care must be taken to ensure once an air mist lubrication
system is used, it is continually used over the life of the product as the oil mist may wash free the factory
installed lubrication.
Locate the lubricator above and within ten feet of the product, and use low viscosity oil such as SAE-10.
Synthetic lubricants are not recommended.
Nexen product's bearings are shielded and pre-lubricated, and require no further lubrication.
LUBRICATOR DRIP RATE SETTINGS
1. Close and disconnect the air line from the unit.
2. Turn the Lubricator Adjustment Knob counterclockwise three
complete turns.
3. Open the air line.
LUBRICATION
CAUTION
These settings are for Nexen supplied
lubricators. If you are not using a Nexen
lubricator, calibration must follow the
manufacturer's suggested procedure.
4. Close the air line to the unit when a drop of oil forms in the
Lubricator Sight Gage.
5. Connect the air line to the unit.
6. Turn the Lubricator Adjustment Knob clockwise until closed.
7. Turn the Lubricator Adjustment Knob counterclockwise one-
third turn.
8. Open the air line to the unit.

6
FORM NO. L-20294-G-0818
AIR CONNECTIONS
NOTE
For quick response, Nexen recommends a quick
exhaust valve and short air lines between the
Control Valves and the product. Align the air inlet
ports to a down position to allow condensation to
drain out of the air chambers of the product.
CAUTION
Low air pressure will cause slippage and
overheating. Excessive air pressure will
cause abrupt starts and stops, reducing
product life.
All Nexen pneumatically actuated devices require clean
and dry air, which meet or exceeds ISO 8573.1:2001
Class 4.4.3 quality.
The following is a common air supply scheme used with
this product. This is an example and not an all-inclusive
list. All air circuits to be used with this product must be
designed following ISO 4414 guidelines.
Air
Supply
Brake
Inlet
Gauge
Regulator
Filter
Dryer
Brake Control Circuit
Quick Exhaust
Valve
3/2 (3 Way)
N.O. Valve
AIR PRESSURE:
8 BAR (120 PSI) ABSOLUTE MAX
0 BAR (0 PSI) ABSOLUTE MIN
AIR LINE CONNECTIONS
Nexen STCs have six air ports. All six air ports accept
1/8'' NPT fittings. Air line connections to the STC can be
made in two ways.
The first method requires three air sources and allows the
operator to interrupt or supply air to any combination of the
three pairs of ports. The three pairs of ports supply pressure
to three different sized pistons. Each port is labeled "A,"
"B," or "C." The two "A" ports supply the smallest pistons.
The two "B" ports supply the intermediate sized pistons.
The two "C" ports supply the largest pistons. The torque
output is related to a change in air pressure and the number
and size of the pistons used.
A
A
B
C
C
B
FIGURE 2
THREE SOURCE PLUMBING
A
A
B
C
C
B
FIGURE 3
ONE SOURCE PLUMBING
NOTE
Only pairs of pistons A, B, or C should be used. Do
not use only one piston.
The second method is to plumb all six ports together so
they are supplied by one source. This method relates the
change in torque performance to change in air pressure.

FORM NO. L-20294-G-0818
7
WARNING
Never exceed maximum operating
speeds listed for your product.
(See Table 1).
OPERATION
TABLE 1
Size Max RPM
STC 600 3600
STC 940 2400
CAUTION
The temperature limits for this
product line are 4.5-104 Degree
Celsius (40-220 Degree F).
WARNING
Ensure proper guarding of the product is used.
Nexen recommends the machine builder
design guarding in compliance with OSHA 29
CFR 1910 “Occupational Safety and Health
Hazards”.
CAUTION
Never exceed life of facing material. Facing
life depends on the volume of material and
the total energy over the life of the unit.
Expected life (in hrs) can be found by:
Time=Volume/(Power*Wear Rate).

8
FORM NO. L-20294-G-0818
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE SOLUTION
Failure to engage. Air not getting to the STC. Check for a control valve malfunction
or low air pressure.
Failure to disengage. Unexhausted air. Check for a control valve malfunction.
Friction Facing squeal or
chatter.
Air pressure too high. Reduce the air pressure.
Wrong Friction Facings for the application. Replace the Friction Facing with
correct facing for the application.
Wobble or vibration. Shaft misalignment. Inspect the shaft and realign it if
necessary.
Drive
Ring
Piston
Guide
Ball
Bearing
End cap
Piston
Diaphragm
Cylinder
Shroud
Rotor
Pilot Mount
Drive Disc
Ball
Bearing
Hub
Return
Spring
Key
O-Ring
Friction
Facing
FIGURE 4
STC600

FORM NO. L-20294-G-0818
9
FRICTION FACING REPLACEMENT
Refer to Figures 5 - 7.
NOTE
This section is for FRICTION FACING REPLACEMENT only.
If a Repair Kit is to be used, refer to PARTS REPLACEMENT.
1. Remove the six Socket Head Cap Screws (Item 25).
2. Remove the End cap (Item 3) and Cylinder (Item 1).
3. Remove the Retaining Ring (Item 21).
4. Insert two customer supplied 3/8-16 UNC bolts into the
anti-rotation holes located on the O.D. of the Piston Guide
(Item 11).
5. Support the STC on the two bolts installed in Step 4; then,
press the Piston Guide (Item 11) and Ball Bearing (Item 22)
off the Hub (Item 5).
7. Slide the Drive Ring (Item 2), Rotor (Item 17), and Shroud
(Item 15) off the Hub (Item 5).
NOTE
The Flat Head Machine Screws (Item 27) securing the
Friction Facing (Item 4) on the STC are installed with a
anaerobic thread locking compound. If removal is difficult,
insert a properly fitting screwdriver into the head of the Flat
Head Machine Screw; then, strike the end of the screwdriver
with a hammer to break the crystalline structure of this
compound and allow removal of the Flat Head Machine
Screw. Never use an impact wrench to remove the Flat
Head Machine Screws.
8. Remove the six Flat Head Machine Screws (Item 27) that
secure the Friction Facing (Item 4) to the Pilot Mount Drive
Disc (Item 6).
9. Remove the old Friction Facing (Item 4).
10. Using six new Flat Head Machine Screws (Item 27), secure
the new Friction Facing (Item 4) to the Pilot Mount Drive Disc
(Item 6).
11. Tighten the six Flat Head Machine Screws (Item 27) to the
recommended torque (See Table 2).
12. Slide the Drive Ring (Item 2), Rotor (Item 17), and Shroud
(Item 15) onto the Hub (Item 5).
13. Press the Piston Guide (Item 11) and Ball Bearing (Item 22)
onto the Hub (Item 5).
14. Remove the two customer supplied 3/8-16 UNC bolts from
the anti-rotation holes located on the O.D. of the Piston Guide
(Item 11).
FIGURE 5
25
3
1
21
FIGURE 6
Customer supplied
3/8 -16 UNC bolts.
11
22
2
17
15
5
FIGURE 7
27
4
6
MODEL RECOMMENDED TORQUE
FLAT HEAD MACHINE SCREWS (ITEM 27)
STC600 26 In. Lbs. [2.9 Nm]
STC940 86 In. Lbs. [9.7 Nm]
TABLE 2
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.

10
FORM NO. L-20294-G-0818
15. Reinstall the Retaining Ring (Item 21).
16. Slide the End cap (Item 3) and Cylinder (Item 1) onto the
Hub (Item 5).
17. Apply a drop of Loctite®242 to the threads of the six Socket
Head Cap Screws (Item 25) and secure the End cap (Item
3) and Cylinder (Item 1) to the Piston Guide (Item 11).
NOTE
Ensure the Pistons (Items 8, 9, and 10) do not bind between
the Diaphragms (Items 12, 13, and 14) and Piston Guide
(Item 11) when the Socket Head Cap Screws (Item 25)
are tightened.
18. Alternately and evenly tighten the six Socket Head Cap
Screws (Item 25) to the recommended torque (See Table 3).
TABLE 3
PARTS REPLACEMENT
DISASSEMBLY
STC600 and STC940
Refer to Figures 8 - 12.
1. Remove the six Socket Head Cap Screws (Item 25).
2. Remove the End cap (Item 3) and Cylinder (Item 1).
3. Remove the six Socket Head Cap Screws (Item 26); then,
separate the Cylinder (Item 1) from the End cap (Item 3).
NOTE
There are three sizes of Diaphragms (See Table 4). When
replacing the six Diaphragms, make sure the correct size
Diaphragm is used for each Diaphragm location.
4. Remove the six old Diaphragms (Items 12, 13, and 14) from
the End cap (Item 3).
NOTE
On STC600, the O-Rings are (Item 31). On STC940, the
O-Rings are (Item 33).
5. Remove the six old O-Rings (Item 31 or 33) from the ends
of the Pistons (Items 8, 9, and 10).
6. Install the six new Diaphragms (Items 12, 13, and 14) into
their respective locations in the End cap (Item 3).
7. Match the Pistons (Items 8, 9, and 10) in the Cylinder (Item
1) with the Diaphragms (Items 12, 13, and 14) in the End
cap (Item 3).
8. Install six new O-Rings (Item 31 or 33) onto the ends of the
Pistons (Items 8, 9, and 10).
9. Apply a drop of Loctite®242 to the threads of the six Socket
Head Cap Screws (Item 26) and secure the End cap (Item
3) to the Cylinder (Item 1).
10. Alternately and evenly tighten the six Socket Head Cap
Screws (Item 26) to the recommended torque (See Table 5).
1
3
25
FIGURE 8
FIGURE 9
26
313
14 12
12 14 13
1
31/33
FRICTION FACING REPLACEMENT (continued)
MODEL
RECOMMENDED TORQUE
SOCKET HEAD CAP
SCREWS (ITEM 25)
STC600 100 In. Lbs. [11.3 Nm]
STC940 580 In. Lbs. [65.5 Nm]
NOTE
The following sections are arranged by model. Verify that you are in the correct section for your model.

FORM NO. L-20294-G-0818
11
21
11
22
5
215
17
19
FIGURE 10
22
11
FIGURE 11
TABLE 4
11. Remove the Retaining Ring (Item 21).
12. Press the Piston Guide (Item 11) and Ball Bearing
(Item 22) off the Hub (Item 5).
13. Slide the Drive Ring (Item 2), Rotor (Item 17), and Shroud
(Item 15) off the Hub (Item 5).
14. Slide the Return Spring (Item 19) off the Hub (Item 5).
15. Press the old Ball Bearing (Item 22) out of the Piston Guide
(Item 11).
16. Clean the bearing bore of the Piston Guide (Item 11) with
fresh safety solvent, making sure all old Loctite®residue is
removed.
17. Apply an adequate amount of Loctite®680 to evenly coat
the outer race of the new Ball Bearing (Item 22).
18. Align the outer race of the new Ball Bearing (Item 22) with
the bearing bore of the Piston Guide (Item 11); then, press
the new Ball Bearing (Item 22) into place.
19. Using customer supplied .250-20 socket head cap screws,
thread three screws into tapped holes in Drive Ring (Item
2).
20. Alternately and evenly tighten three screws to press Drive
Ring (Item 2) and shroud (Item 15) off Ball Bearing (Item
23).
21. Remove customer supplied screws when press is complete.
22. Pull the old Ball Bearing (Item 23) off the Rotor
(Item 17).
23. Clean the bearing bore of the Drive Ring (Item 2) with fresh
safety solvent, making sure all old Loctite®residue is removed.
24. Apply an adequate amount of Loctite®680 to evenly coat
the outer race of the new Ball Bearing (Item 23).
25. Align the outer race of the new Ball Bearing (Item 23) with
the bearing bore of the Drive Ring (Item 2); then, press the
new Ball Bearing (Item 23) into place.
26. Press the Rotor (Item 17) into the Ball Bearing (Item 23) and
Drive Ring (Item 2).
NOTE
If you are replacing parts on the STC600, proceed with Step
1 for STC600. If you are replacing parts on the STC940,
proceed with Step 1 for STC940.
FIGURE 12
2
15
23
17
Customer supplied
.250-20 socket head cap screw.
TABLE 5
PARTS REPLACEMENT (continued)
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
MODEL
RECOMMENDED TORQUE
SOCKET HEAD CAP
SCREWS (ITEM 26)
STC600 50 In. Lbs. [5.6 Nm]
STC940 580 In. Lbs. [65.5 Nm]
DIAPHRAGM
O.D. ITEM 12 ITEM 13 ITEM 14
STC600 1.25 In.
[31.75 mm]
1.50 In.
[38.10 mm]
1.75 In.
[44.45 mm]
STC940 2.25 In.
[57.15 mm]
2.50 In.
[63.50 mm]
2.75 In.
[69.85 mm]

12
FORM NO. L-20294-G-0818
PILOT BEARING AND FACING REPLACEMENT
STC600
Refer to Figure 13.
1. Press the Hub (Item 5) out of the two Ball Bearings (Item
24) and Pilot Mount Drive Disc (Item 6).
2. Remove the Retaining Ring (Item 20) from the Pilot Mount
Drive Disc (Item 6).
3. Press the two old Ball Bearings (Item 24) out of the Pilot
Mount Drive Disc (Item 6).
4. Clean the bearing bore of the Pilot Mount Drive Disc (Item 6)
with fresh safety solvent, making sure all old Loctite®residue
is removed.
5. Apply an adequate amount of Loctite®680 to evenly coat
the outer race of the new Ball Bearings (Item 24).
6. Align the outer race of the first new Ball Bearing
(Item 24) with the bearing bore of the Pilot Mount
Drive Disc (Item 6); then, press the new Ball Bearing
(Item 24) into place.
7. Align the outer race of the second new Ball Bearing
(Item 24) with the bearing bore of the Pilot Mount Drive
Disc (Item 6); then, press the second new Ball Bearing
(Item 24) into place.
8. Install the Retaining Ring (Item 20).
9. Supporting the inner race of the two new Ball Bearings, press
the Hub (Item 5) into the two new Ball Bearings (Item 24)
and Pilot Mount Drive Disc.
NOTE
The Flat Head Machine Screws (Item 27) securing the
Friction Facing (Item 4) on the STC are installed with a
anaerobic thread locking compound. If removal is difficult,
insert a properly fitting screwdriver into the head of the Flat
Head Machine Screw; then, strike the end of the screwdriver
with a hammer to break the crystalline structure of this
compound and allow removal of the Flat Head Machine
Screw. Never use an impact wrench to remove the Flat
Head Machine Screws.
10. Remove the six old Flat Head Screws (Item 27) that secure
the Friction Facing (Item 4) to the Pilot Mount Drive Disc.
11. Remove the old Friction Facing (Item 4).
12. Using six new Flat Head Screws (Item 27), secure the new
Friction Facing (Item 4) to the Pilot Mount Drive Disc.
13. Tighten the six Flat Head Screws (Item 27) to 26 In. Lbs. [2.9
Nm] torque.
FIGURE 13
27
4
6
24
24
20
5
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
PARTS REPLACEMENT (continued)

FORM NO. L-20294-G-0818
13
5
29
27
4
6
24
16
24
20
31
FIGURE 14
32
STC940
Refer to Figure 14.
1. Remove the Retaining Ring (Item 31).
2. Press the Hub (Item 5) out of the two Ball Bearings (Item
24), Spacer (Item 16), and Pilot Mount Drive Disc (Item 6).
NOTE
Do not remove the Backing Plate (Item 39) from the Hub
(Item 5).
3. Remove the Retaining Ring (Item 20).
4. Press the two old Ball Bearings (Item 24) and Spacer (Item
16) out of the Pilot Mount Drive Disc (Item 6).
5. Clean the bearing bore of the Pilot Mount Drive Disc (Item 6)
with fresh safety solvent, making sure all old Loctite®residue
is removed.
6. Apply an adequate amount of Loctite®to evenly coat the
outer race of the two new Ball Bearings (Item 24).
7. Align the outer race of the first new Ball Bearing
(Item 24) with the bearing bore of the Pilot Mount Drive
Disc (Item 6); then, press the first new Ball Bearing (Item
24) into place.
8. Reinstall the Spacer (Item 16).
9. Align the outer race of the second new Ball Bearing (Item 24)
with the bearing bore of the Pilot Mount Drive Disc (Item 6);
then, supporting the inner race, press the second new Ball
Bearing (Item 24) into place.
10. Reinstall the Retaining Ring (Item 20).
11. Supporting the inner race of the second new Ball Bearing,
press the Hub (Item 5) into the two new Ball Bearings (Item
24), Spacer (Item 16), and Pilot Mount Drive Disc.
12. Reinstall the Retaining Ring (Item 31).
NOTE
The Flat Head Machine Screws (Item 27) securing the
Friction Facing (Item 4) on the STC are installed with a
anaerobic thread locking compound. If removal is difficult,
insert a properly fitting screwdriver into the head of the Flat
Head Machine Screw; then, strike the end of the screwdriver
with a hammer to break the crystalline structure of this
compound and allow removal of the Flat Head Machine
Screw. Never use an impact wrench to remove the Flat
Head Machine Screws.
13. Remove the six old Flat Head Screws (Item 27) that secure
the Friction Facing (Item 4) to the Pilot Mount Drive Disc.
14. Remove the old Friction Facing (Item 4).
15. Using six new Flat Head Screws (Item 27), secure the new
Friction Facing (Item 4) to the Pilot Mount Drive Disc.
16. Tighten the six Flat Head Screws (Item 27) to 86 In. Lbs. [9.7
Nm] torque.
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
PARTS REPLACEMENT (continued)

14
FORM NO. L-20294-G-0818
REASSEMBLY
STC600 and STC940
Refer to Figures 15 & 16.
1. Slide the Return Spring (Item 19) onto the Hub (Item 5).
2. Slide the Drive Ring (Item 2), Rotor (Item 17), and Shroud
(Item 15) onto the Hub (Item 5).
NOTE
The Dowel Pin (Item 7) must be aligned with the hole in
the Piston Guide (Item 11).
3. Press the Ball Bearing (Item 22) and the Piston Guide (Item
11) onto the Hub (Item 5).
4. Install the Retaining Ring (Item 21).
5. Slide the End cap (Item 3) and Cylinder (Item 1) onto the
Hub (Item 5).
6. Apply a drop of Loctite®242 to the threads of the six Socket
Head Cap Screws (Item 25) and secure the End cap (Item
3) and Cylinder (Item 1) to the Piston Guide (Item 11).
NOTE
Ensure the Pistons (Item 8, 9, and 10) do not bind between
the Diaphragms (Items 12, 13, and 14) and Piston Guide
(Item 11) when the Socket Head Cap Screws (Item 25)
are tightened.
7. Alternately and evenly tighten the six Socket Head Cap
Screws (Item 25) to the recommended torque (See Table 6).
FIGURE 15
19
5
15
17
21
2
7
11
22
25
5
3
1
11
FIGURE 16
TABLE 6
CAUTION
Working with spring loaded or tension
loaded fasteners and devices can cause
injury. Wear safety glasses and take the
appropriate safety precautions.
MODEL
RECOMMENDED TORQUE
SOCKET HEAD CAP
SCREWS (ITEM 25)
STC600 100 In. Lbs. [11.3 Nm]
STC940 580 In. Lbs. [65.5 Nm]
PARTS REPLACEMENT (continued)

FORM NO. L-20294-G-0818
15
ITEM DESCRIPTION QTY
1 Cylinder 1
2 Drive Ring 1
3 End cap 1
41,2 Friction Facing 1
5 Hub 1
6 Pilot Mount Drive Disc 1
7 Dowel Pin 1
8 Piston (1.00'' O.D.) 2
9 Piston (1.25'' O.D.) 2
10 Piston (1.50'' O.D.) 2
11 Piston Guide 1
121Diaphragm (1.25'' O.D.) 2
131Diaphragm (1.50'' O.D.) 2
141Diaphragm (1.75'' O.D.) 2
15 Shroud 1
17 Rotor 1
1Denotes Rebuild Kit items.
STC600 Rebuild Kit No. 927201.
ITEM DESCRIPTION QTY
19 Return Spring 1
201,2 Retaining Ring (Int.) 1
211,2 Retaining Ring (Ext.) 1
221Ball Bearing 1
231Ball Bearing 1
241Ball Bearing 2
25 Socket Head Cap Screw 6
26 Socket Head Cap Screw 6
271,2 Flat Head Screw 6
28 Round Head Screw 6
29 Set Screw 2
30 Key (Not Shown) 1
311O-Ring 6
36 Air Line (Not Shown) --
37 Elbow Fitting (Not Shown) 3
38 Tee Fitting (Not Shown) 5
26
25
313
14 12 9
10 8
15
FIGURE 17
STC600
1
22
21
31
31
11
2
28
7
29
5
20
24
24
6
19
4
27
17
23
2Denotes Facing Kit items.
STC600 Facing Kit No. 927202.
REPLACEMENT PARTS LIST
The item or balloon number for all Nexen products is used
for part identification on all product parts lists, product
price lists, unit assembly drawings, bills of materials, and
instruction manuals.
When ordering replacement parts, specify model
designation, item number, part description, and quantity.
Purchase replacement parts through your local Nexen
Distributor.

16
FORM NO. L-20294-G-0818
ITEM DESCRIPTION QTY
1 Cylinder 1
2 Drive Ring 1
3 End cap 1
41,2 Friction Facing 1
5 Hub 1
6 Pilot Mount Drive Disc 1
7 Dowel Pin 1
8 Piston (2.00'' O.D.) 2
9 Piston (2.25'' O.D.) 2
10 Piston (2.50'' O.D.) 2
11 Piston Guide 1
121Diaphragm (2.25'' O.D.) 2
131Diaphragm (2.50'' O.D.) 2
141Diaphragm (2.75'' O.D.) 2
15 Shroud 1
16 Spacer 1
17 Rotor 1
19 Return Spring 1
1Denotes Rebuild Kit items.
STC940 Rebuild Kit No. 927212.
25
ITEM DESCRIPTION QTY
201,2 Retaining Ring (Int.) 1
211,2 Retaining Ring (Ext.) 1
221Ball Bearing 1
231Ball Bearing 1
241Ball Bearing 2
25 Socket Head Cap Screw 6
26 Socket Head Cap Screw 6
271,2 Flat Head Screw 6
28 Round Head Screw 6
29 Set Screw 2
30 Key (Not Shown) 1
31 Retaining Ring (Ext.) 1
331O-Ring 6
36 Air Line (Not Shown) --
37 Elbow Fitting (Not Shown) 3
38 Tee Fitting (Not Shown) 5
39 Backing Plate 1
2Denotes Facing Kit items.
STC940 Facing Kit No. 927213.
FIGURE 18
STC940
26
313
14 12 9
10 8
15
1
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FORM NO. L-20294-G-0818
17
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, MN 55127
800.843.7445
Fax: [phone]
www.nexengroup.com
ISO 9001 Certified
WARRANTY
Warranties
Nexen warrants that the Products will (a) be free from any defects in material or workmanship for a period of 12 months
from the date of shipment, and (b) will meet and perform in accordance with the specifications in any engineering drawing
specifically for the Product that is in Nexen’s current product catalogue, or that is accessible at the Nexen website, or that is
attached to this Quotation and that specifically refers to this Quotation by its number, subject in all cases to any limitations
and exclusions set out in the drawing. NEXEN MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL
IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. This warranty applies only if: (a) the Product has
been installed, used and maintained in accordance with any applicable Nexen installation or maintenance manual for the
Product; (b) the alleged defect is not attributable to normal wear and tear; (c) the Product has not been altered, misused or
used for purposes other than those for which it was intended; and (d) Buyer has given written notice of the alleged defect
to Nexen, and delivered the allegedly defective Product to Nexen, within one year of the date of shipment.
Exclusive Remedy
The exclusive remedy for the Buyer for any breach of any warranties provided in connection with this agreement will be,
at the election of Nexen: (a) repair or replacement with new, serviceably used, or reconditioned parts or products; or (b)
issuance of credit in the amount of the purchase price paid to Nexen by the Buyer for the Products.
Agent's Authority
Buyer agrees that no agent, employee or representative of Nexen has authority to bind Nexen to any affirmation, representation,
or warranty concerning the Products other than those warranties expressly set forth herein.
Limitation on Nexen’s Liability
TO THE EXTENT PERMITTED BY LAW NEXEN SHALL HAVE NO LIABILITY TO BUYER OR ANY OTHER PERSON
FOR INCIDENTAL DAMAGES, SPECIAL DAMAGES, CONSEQUENTIAL DAMAGES OR OTHER DAMAGES OF ANY
KIND OR NATURE WHATSOEVER, WHETHER ARISING OUT OF BREACH OF WARRANTY OR OTHER BREACH
OF CONTRACT, NEGLIGENCE OR OTHER TORT, OR OTHERWISE, EVEN IF NEXEN SHALL HAVE BEEN ADVISED
OF THE POSSIBILITY OR LIKELIHOOD OF SUCH POTENTIAL LOSS OR DAMAGE. For all of the purposes hereof, the
term "consequential damages" shall include lost profits, penalties, delay damages, liquidated damages or other damages
and liabilities which Buyer shall be obligated to pay or which Buyer may incur based upon, related to or arising out of its
contracts with its customers or other third parties. In no event shall Nexen be liable for any amount of damages in excess of
amounts paid by Buyer for Products or services as to which a breach of contract has been determined to exist. The parties
expressly agree that the price for the Products and the services was determined in consideration of the limitation on damages
set forth herein and such limitation has been specifically bargained for and constitutes an agreed allocation of risk which
shall survive the determination of any court of competent jurisdiction that any remedy herein fails of its essential purpose.
Inspection
Buyer shall inspect all shipments of Products upon arrival and shall notify Nexen in writing, of any shortages or other failures
to conform to these terms and conditions which are reasonably discoverable upon arrival without opening any carton or
box in which the Products are contained. Such notice shall be sent within 14 days following arrival. All notifications shall be
accompanied by packing slips, inspection reports and other documents necessary to support Buyer's claims. In addition
to the foregoing obligations, in the event that Buyer receives Products that Buyer did not order, Buyer shall return the
erroneously shipped Products to Nexen within thirty (30) days of the date of the invoice for such Products; Nexen will pay
reasonable freight charges for the timely return of the erroneously shipped Products, and issue a credit to Buyer for the
returned Products at the price Buyer paid for them, including any shipping expenses that Nexen charged Buyer. All shortages,
overages and nonconformities not reported to Nexen as required by this section will be deemed waived.
Limitation on Actions
No action, regardless of form, arising out of any transaction to which these terms and conditions are applicable may be
brought by the Buyer more than one year after the cause of action has accrued.