DE-STA-CO TG20 User Manual
WARNING
This is a controlled document. It is your responsibility to deliver this information to the end user of the
CAMCO/FERGUSON product. Failure to deliver this could result in your liability for injury to the user or
damage to the machine. For copies of this manual call your Customer Service Representative 800-645-5207.
The Driving Force in Automation
SERVICE MANUAL
TORQ-GARD
™
OVERLOAD CLUTCH
mechanical
torque-limiting
overload clutch
Installation–Operation
and Maintenance Instructions
1. Read your Torq-Gard Installation-Operation Instructions
thoroughly before operating the unit, for your safety and the
protection of your equipment.
2. Double check to be sure the power is off and cannot be turned
on while working on the equipment.
3. Electrical power should be disconnected at the fuse box, circuit
breaker or motor starter.
4. The Torq-Gard Clutch is designed to protect your machine and
will not protect against bodily injury.
5. Keep all objects such as hands, clothing, tools, etc. away from
rotating or moving parts.
6. Use safety glasses or equivalent to protect your eyes.
7. Do not manually re-engage the Torq-Gard Clutch. (Refer to
“Automatic Reset” instruction.)
8. Do not adjust the torque while the clutch is disengaged. (Refer
to “Torque Setting” instruction.)
9. Do not exceed the recommended maximum RPM. (Refer to
Torq/Gard Rating Chart.)
10. The detector mechanism must electrically disconnect the prime
mover at the recommended RPM settings. (Refer to “Overload
Detection” instruction.)
11. Shaft mounting set screws must clear the mounting bosses or
the clutch will not release upon overload. (Refer to “Mounting
the Torq/Gard” instruction.)
12. Shaft and detector mounting set screws must be tight and the
recommended number used. (Refer to “Mounting the Torq/Gard”
instruction.)
The above list includes major safety points to be observed, but
should not be considered as limiting in safety precautions to be
followed.
Operating Principle
Torq/Gard Overload Clutches help protect the entire drive train of
your machinery from damage due to excessive torque generated by
overloads and jamming. The torque is adjusted by turning the single
hex-socket head control which adjusts the Torq/Gard Clutch
precisely to any setting within its load range. A spring-loaded cam
follower seated in a single hub cam detent causes the hub and
clutch body to rotate as a unit. The two point contact of the follower
produces equal forces within the cam detent, minimizing the effect
of “breathing”, found in conventional clutches. When the pre-set
torque limit is exceeded by an overload condition, the follower is
instantly released from the cam detent, disconnecting the hub from
the body. Either the hub or the body may be used as the input or
output.
NOTE: During overload, the Torq/Gard produces a loud audible
report, which is a normal operating characteristic of the clutch.
In direct coupled applications, the modular designed Torq/Gard can
be used with Browning Ever-Flex Couplings or Chain Coupling Kits,
without modification to the clutch or couplings. Split taper bushings
are available for the coupling output.
Browning Torq/Gard single strand sprockets, for No. 40, 60, 80, and
100 ANSI Standard Roller Chain Drives, mount directly to the clutch.
Browning Torq/Gard Gearbelt Pulleys are also available for 1/2”
Pitch Belts.
Before mounting the clutch on the driving or driven shaft, your choice
of coupling or sprocket should be attached to the Torq/Gard Clutch.
Sprocket Installation
Browning Torq/Gard Single Strand
Sprockets register with the drilled and
tapped mounting lugs on the adapter
end of clutch. Torq/Gard Chain Drives
can be used as the driving or driven
member. See page 6 for sprocket
availability.
1. Place the sprocket on the registered
mounting lugs.
2. Select the correct length Hex. Head
Cap Screws (3 required) from Table A.
Warning: Short Screws may strip the mounting lug threads.
3. For maximum locking effect, (medium) spring lock washers
should be used under the Hex. Head Cap Screws.
Table A–Sprocket Mounting Hardware
TG3/6 TG35A__K #8-32 X .50 HHCS
TG20 20TG40A__K #10-24 X .62 HHCS
TG60 TG40A__K 1/4-20 X .75 HHCS
TG200 TG60A__K 3/8-16 X 1.00 HHCS
TG400 TG80A__K 1/2-13 X 1.50 HHCS
TG800 TG100A__K 1/2-13 X 1.75 HHCS
Gear Belt Pulley Installation
Follow the above mounting instructions for the Browning Torq/Gard
Gear Belt Pulleys, using the longer Hex. Head Cap Screws supplied
with the pulleys.
Chain Coupling Installation
1. Select the Browning Chain Coupling
components from page 6 for the
applicable Torq/Gard Model.
2. Mount the single strand sprocket per
the above “Sprocket Installation”
instructions.
3. Place the Split Taper Bushing
Sprocket over the Single Sprocket,
with the corresponding teeth in
alignment.
4. Secure the two sprockets by wrapping the double strand roller
chain around the sprockets, insuring that the sprocket teeth fully
engage the chain.
torq/gard
™
2
5. Insert the chain connecting link in the chain ends and lock with
the spring clip (supplied with the connecting link).
When assembled correctly, the Split Taper Bushing Sprocket will
“float”, for maximum misalignment capability.
Ever-Flex Coupling Installation
1. Select the correct Ever–Flex Coupling
and Adapter Plate from page 6.
2. Attach the Adapter Plate to the
Torq/Gard mounting lugs with three
(3) Allen Flat Head Cap Screws
supplied with the adapter.
3. Mount the Ever-Flex half coupling on
the Adapter Plate with the eight (8)
Hex. Head Cap Screws supplied with
the Adapter Plate.
(Quantity 10 Hex. Head Cap Screws are supplied with Adapter Plate
400CAP9 and 800CAP10.)
Mounting The Torq/Gard
The Torq/Gard Clutch hub is machined
to its maximum bore diameter. Shafts
smaller than the maximum diameter are
accommodated with standard Browning
Torq/Gard Bushing Kits as shown on
page 6. The bushing kits are complete
with bushing, key and shaft set screws.
Note: Six (6) set screws are supplied in
four (4) lengths.
Warning: The correct length set screws
must be used as the clutch will not
release if the set screws extend beyond
the hub and hit the adapter mounting lugs.
The Torq/Gard Clutch can be shaft mounted from the adapter or
detector end of the hub. The required shaft set screw lengths vary
depending on the bushing selected. They will also vary in length if
used on the detector end in conjunction with the detector
mechanism.
Tables B, C and D include all set screw combinations for any
bushing or mounting option.
Example 1:
A TGC60 Clutch requires a .750 inch diameter shaft mounted on the
adapter end.
Selection: A Browning 60BU012 Bushing Kit is chosen from page 6.
The correct set screws from Table B (adapter end):
Qty. 2 .190-32UNF-2A x .50 Long
Qty. 1 .190-32UNF-2A x .19 Long (over key)
Example 2:
A TGC60 Clutch requires a .750 inch diameter shaft mounted on the
detector end with the detector mechanism.
Section: A Browning 60BU012 Brushing Kit.
The correct set screws from Table B (detector end):
Qty. 2 .190-32UNF-2A x .75 Long
Qty. 1 .190-32UNF-2A x .38 Long (over key)
NOTE: If the Bushing was used on the detector end without the
detector, the selection would be the same as Example 1.
Table B–TGC60 Clutch
Detector End
Set Scr. Length (1) Reqd.
Set Scr. Length (2) Reqd. to Retain Detector Cam
Shaft Dia. to Retain Detector Cam Over Key
.750 Dia. .190-32UNF-2A x .75 Lg. .190-32UNF-2A x .38 Lg.
.9375 Dia./1.125 Dia. .190-32UNF-2A x .62 Lg. .190-32UNF-2A x .38 Lg.
1.250 Dia. .190-32UNF-2A x .50 Lg. .190-32UNF-2A x .38 Lg.
Adapter End
Set Scr. Length (2) Reqd. Set Scr. Length (1) Reqd.
@ Adapter End Over Key @ Adapter
Shaft Dia. of Clutch End of Clutch
.750 Dia. .190-32UNF-2A x .50 Lg. .190-32UNF-2A x .19 Lg.
.9375 Dia./1.125 Dia. .190-32UNF-2A x .38 Lg. .190-32UNF-2A x .19 Lg.
1.250 Dia. .190-32UNF-2A x .25 Lg. .190-32UNF-2A x .19 Lg.
Table C–TGC200 Clutch
Detector End
Set Scr. Length (1) Reqd.
Set Scr. Length (2) Reqd. to Retain Detector Cam
Shaft Dia. to Retain Detector Cam Over Key
.9375 Dia./1.250 Dia. .250-20UNC-2A x 1.0 Lg. .250-20UNC-2A x .50 Lg.
1.250 Dia./1.500 Dia. .250-20UNC-2A x .88 Lg. .250-20UNC-2A x .50 Lg.
1.500 Dia./1.750 Dia. .250-20UNC-2A x .75 Lg. .250-20UNC-2A x .50 Lg.
1.750 Dia./1.9375 Dia. .250-20UNC-2A x .62 Lg. .250-20UNC-2A x .50 Lg.
Adapter End
Set Scr. Length (2) Reqd. Set Scr. Length (1) Reqd.
@ Adapter End Over Key @ Adapter
Shaft Dia. of Clutch End of Clutch
.9375 Dia./1.250 Dia. .250-20UNC-2A x .75 Lg. .250-20UNC-2A x .25 Lg.
1.250 Dia./1.500 Dia. .250-20UNC-2A x .62 Lg. .250-20UNC-2A x .25 Lg.
1.500 Dia./1.750 Dia. .250-20UNC-2A x .50 Lg. .250-20UNC-2A x .25 Lg.
1.750 Dia./1.9375 Dia. .250-20UNC-2A x .38 Lg. .250-20UNC-2A x .25 Lg.
Table D–TGC400 and TGC800 Clutch
Detector End
Set Scr. Length (1) Reqd.
Set Scr. Length (2) Reqd. to Retain Detector Cam
Shaft Dia. to Retain Detector Cam Over Key
.375 Dia./1.688 Dia. .375-16UNC-2A x 1.25 Lg. .375-16UNC-2A x .62 Lg.
1.750 Dia./2.125 Dia. .375-16UNC-2A x 1.00 Lg. .375-16UNC-2A x .62 Lg.
2.125 Dia./2.4375 Dia. .375-16UNC-2A x .88 Lg. .375-16UNC-2A x .62 Lg.
Adapter End
Set Scr. Length (2) Reqd. Set Scr. Length (1) Reqd.
@ Adapter End Over Key @ Adapter
Shaft Dia. of Clutch End of Clutch
1.375 Dia./1.688 Dia. .375-16UNC-2A x .88 Lg. .375-16UNC-2A x .38 Lg.
1.750 Dia./2.125 Dia. .375-16UNC-2A x .62 Lg. .375-16UNC-2A x .38 Lg.
2.125 Dia./2.4375 Dia. .375-16UNC-2A x .50 Lg. .375-16UNC-2A x .38 Lg.
1. Select the Browning Torq/Gard Bushing Kit from page 6.
2. Refer to tables B, C or D for the correct shaft set screws.
(3 required)
3. Slide the bushing with the mating key on the shaft.
Note: The use of LOCTITE C5 - Anti-Seize lubricant is
recommended to ease assembly of the bushing to the shaft
and the Clutch to the bushing.
4. The shaft length must be at least equal to the bushing length to
insure engagement of the Torq/Gard bearings. Limited shaft
lengths or high overhung load applications require additional
outboard bearing support. Browning Bushings are manufactured
specifically to fit the entire length of the hub which provides
additional support. Again, check Tables B, C or D to insure that
the correct length set screws are used and that they will engage
the shaft.
5. Apply Perma-Lok HM118 to the set screws and mating tapped
holes in the Clutch hub.
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