IMPORTANT NOTICE: Twin Disc, Incorporated reminds users of these products that their safe operation depends on use in compliance with engineering information provided in this catalog. Users are also reminded that safe operation depends on proper installation, operation and routine maintenance and inspection under prevailing conditions. It is the responsibility of users (and not Twin Disc, Incorporated) to provide and install guards or safety devices which may be required by recognized safety standards or by the Occupational Safety and Health Act of 1970 and its subsequent provisions. BULLETIN308S 1/15 PRINTED IN U.S.A. TWIN DISC, INCORPORATED RACINE, WISCONSIN 53403, U.S.A. 262-638-4000/262-638-4481 (FAX) WWW.TWINDISC.COM U.S.A. • AUSTRALIA • BELGIUM • CANADA • CHINA • INDIA • JAPAN • ITALY • SINGAPORE • SWITZERLAND With our vast network of locations around the world, Twin Disc offers you unprecedented global sales and service support. We can put engineering and service expertise on location virtually anywhere. We’ll work with you on your particular application and product to ensure optimum results. We’re more than just a name you know, Twin Disc is a name you can trust. GO WITH WHO YOU KNOW SELECTION GUIDE mechanical power take-offs WE PUT HORSEPOWER TO WORK ®
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IMPORTANT NOTICE: Twin Disc, Incorporated reminds users of these products that their safe operation depends on use in compliance with engineering information provided in this catalog. Users are also reminded that safe
operation depends on proper installation, operation and routine maintenance and inspection under prevailing conditions. It is the responsibility of users (and not Twin Disc, Incorporated) to provide and install guards or safety
devices which may be required by recognized safety standards or by the Occupational Safety and Health Act of 1970 and its subsequent provisions. BULLETIN308S 1/15 PRINTED IN U.S.A.
U.S.A. • AUSTRALIA • BELGIUM • CANADA • CHINA • INDIA • JAPAN • ITALY • SINGAPORE • SWITZERLAND
With our vast network of locations around the
world, Twin Disc offers you unprecedented global
sales and service support. We can put engineering
and service expertise on location virtually
anywhere. We’ll work with you on your particular
application and product to ensure optimum results.
We’re more than just a name you know,
Twin Disc is a name you can trust.
GO WITH WHO YOU KNOW
SELECTION GUIDE
mechanical power take-offs
WE PUT HORSEPOWER TO WORK®
254.00(10.00)
426.50(16.79)
25.4(1.00)
39.6(1.56)
96.4(3.80)
25.4 SQ x 215.9 KEY(1.0 SQ. x 8.5)
3.9373.936
100.0099.99
593.
9 [2
3.38
]
38.1
[1.5
0] H
EX.
25.4 [1.00]
349.2 [13.75]323.8 [12.75]
125.7 [4.95]
68.61 [2.701]ÿ11.9 THRU
12 HOLESEQUALLY SPACED
114.
0 [4
.49]
ÿ355.6 [14.00]
(8) 5/8 HEX. HD. BOLTSEQUALLY SPACEDINCH
7/16-14 UNC-2B THD. THRU2 HOLES, 180? APART
INCH
DIM
. “A”
121.8
198.358.9
25.4
263.7
12.7 MIN.
355.
5ÿ
177.8
146.0
22.2 x 22.2 x 146.0 KEY
190.
47ÿ ±
0.03
SUPPORT PLATE
KWY. LENGTH
88.8
88ÿ ±
0.01
3
218.95(8.62)
74.68(2.94)
100.07(3.94)
304.8 (12.0)
76.2(3.0)
19.05 SQ. x 184.15 (0.75 SQ. x 7.25) KEY
80(3.15)
TWIN DISC SETS THE STANDARD IN POWER TAKE-OFFSPower take-offs (PTOs) are used as a standard method for transmitting the power of engines in a great variety of industrial applications such as air compressors, agricultural machinery, crushers, road building machinery, cranes, shovels, pump drives and oil field service. A power take-off consists of a complete clutch assembly with shaft and bear-ings mounted in a cast-iron housing for easy engine installation.
Twin Disc offers power take-offs for all industrial engines. The IBF line is designed especially for today’s high inertia applications and presently is offered in two- and three-clutch plate construction. This multiple-plate, ventilated design assures ample cooling area to with-stand heat, and with solid friction plates, these PTOs can effectively handle the stress of higher engine speeds. The IBF units feature oil lubricated tapered roller bearings that extend lubrication intervals.
An extra margin of strengthActual design torque capacity of the clutches used in Twin Disc power take-offs is in excess of the horsepower rating listed. This permits Twin Disc power take-offs in proper adjustment to withstand temporary torque overloads. Rated torque can be transmitted while moderately slipping during short periods without permanent damage.
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SPECIAL POWER TAKE-OFFS
Special power take-offs are available from Twin Disc. These include the innovative straddle bearing concept and a limited-attendance PTO that contains a positive throw-out collar clearance mechanism and extended lubrication intervals.
For original equipment manufacturers, Twin Disc can design other special power take-offs to meet individual requirements when sufficient volume is indicated. Design variations can range from minor changes to entirely new concepts.
Straddle Bearing Power Take-Offs• SP&POModels
• Highside-loadapplications
• Nopilotbearing
• 14”&18”flywheelconnection
• SAE#0&SAE#1InputHousing
• 180°sheavehousingrotatableby90°increments
Limited-Attendance Power Take-Offs• ModifiedSP&CModels
•Containclutchesranginginsizefromoneplate61⁄2" to one plate14";intwo-platesizefrom11"to18";andthree-plate sizefrom11"to21".
•Standardsealedpilotballorrollerbearingseliminatethelubricationrequirementandshaftrifle-drillingnormallyencounteredwith standard pilot bearings. Also available as options: ball bearing throw-out collars and finger springs.
•Horsepowerandtorquecapacitieslistedcanbeincreasedbytheuse of sintered-iron clutch plates, which are available as optional equipmentinthe8"through21"sizes.
*Toavoidoverloadingtheshaftandbearings,usetheallowableside-pullloaddatainthis bulletin, and calculate the side load. The resultant value should be less than the corresponding maximum value listed for each power take-off. In questionable cases, consult the Twin Disc Application Department, Twin Disc, Incorporated, Racine, Wisconsin.
SP TYPE POWER TAKE-OFF
IB TYPE POWER TAKE-OFF
OptionalPilotBearings
Forged Steel LeversCentrifugal Assisted Release
Tapered RollerMain Bearings
Ball or Tapered Roller Main Bearings
Optional PilotBearings
Single FrictionPlate only
OptionalPilotBearings
Ventilated Center Platesand Drive Ring
Forged Steel LeversCentrifugal Assisted Release
Tapered RollerMain Bearings
Higher Side-LoadCarrying Capacity
C(X) TYPE POWER TAKE-OFF
Spring Loaded Power Take-Offs• SL&TCModels
• Self-adjustingspring-loadedclutch
• Idealforhighfrequencyengagements
• Single-anddouble-frictionplates
• 11”,13”,14”flywheelconnection
• SAE#1throughSAE#4InputHousing
Rubber Block Drive Power Take-Offs• RBDModels
• Directdrive/Clutchless
• Absorbstorsionalactivity
• Singlerow11”rubberblocks
• Doublerow14”rubberblocks
• SAE#0throughSAE#2InputHousing
Pump Mount Power Take-Offs• BDP&BDSPModels
• SingleSAEpadonoutputofPTO
• SAE“A”throughSAE“D” pads available
• SAE#1throughSAE#4InputHousing
• 11.5”flywheelconnection
• Optionalkeyedstubshaftinputforremote mount applications
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HOW TO CHOOSE THE APPROPRIATE PTO
Several factors must be considered in the selection process in addition to duty service, such as:
SPEEDLIMITS•SIDE-LOADLIMITS•CLUTCHTORQUELIMITS
The selections are usual dry clutch disconnect type applications where engagements are infrequent and are at low (idle) input speed. Once engaged operation continues for one hour or more, engaging the clutch at higher input speed will reduce component life. Refer to the following duty classifications and examples.
FindproperdutyclassalongtoprowandSAEhousing&flywheelsizealongleft-handcolumnoftheratingtableonpage 6. A PTO that has a power or torque rating greater than the calculated application power or torque rating is suitable for the application. The PTO output shaft speed should be at or under the listed ratings for the drive rings.
UsePTOoutputshaftspeedandcalculatedside-loadandrefertotablesonpages7-8toverifythattheside-loadisat or under the load at the given speed.
PTO SIZING EXAMPLE – Select the proper Twin Disc PTO for this application
3. Use the following data and compare to the PTO rating and allowable side-load tables: –190hpNETtoclutch –2,302lbsofside-load –SAE11.5"flywheel –2,000rpmPTOshaftspeed –SAE#2housing
GENERAL INFORMATION NOTES1.CapscrewstomountPTOanddrivingringtoprimemoverarenotTwinDiscsupplied.
2. Installation of support plate to PTO housing requires bearing carrier capscrews be properly retorquedtopreventdamage.RefertoapplicableCareandOperationservicemanual.
IMPORTANT NOTICE: Disregarding system torsional compatibility could cause damage to components in the drive train resulting in loss of mobility or power transmission for which the drive is intended. At minimum, system incompatibility could result in unwanted noise and vibration at low speeds.
The responsibility for ensuring that the torsional compatibility of the system is satisfactory rests with the assembler of the drive and driven equipment.
Torsional vibration analysis can be made by the engine builder, independent consultants and others. Twin Disc is prepared to assist in finding solutions to potential torsional problems that relate to the power take-off, pump mount PTO or rubber block drive.
SELECTION GUIDE TO DUTY CLASSIFICATION
* BEWARE OF OPERATOR MISUSE
CLASS I (Disconnect) 1.Pumps–centrifugal 2. Hydraulic pumps (without pre-charge) 3.Feeders–disctype 4.Agitators–pureliquids 5.Irrigationpumps
Duty Class I: The clutch is used for disconnecting the power from the load. When engaging, so little work is done that the clutch shows no temperature increase at the pressure plate outersurface.UsemaximuminputtorquefromtheClassITable,disregardhorsepower. The mechanism is operated one or more hours before disconnecting.
Examples: Engagement of clutches with the driven equipment having WR2 less than that of the clutch and whose torque demand curve is similar to that of a centrifugal pump.
CLASS II (Light Duty) 1.Cookers–cereal 2. Elevators – bucket, uniformly loaded all types 3.Kettles–brew 4.Lineshafts–lightduty 5.Machines,general–alltypeswithuniformloads,non-reversing 6. Bow thrusters 7.Generators(non-welding)
Duty Class II: The clutch is used primarily for disconnect, but does more work during engage-mentthaninDutyClassI.Theclutchwillengagewithintwoseconds,neverheatthepressureplatemorethan50ºF(28ºC)aboveambient,andonceengagedisoperatedforoneormorehours before disconnecting. The maximum horsepower which the clutch can absorb is given inClassIITable.
Examples: Power shovel master clutches, generators, line shafts and similar light-duty drives.
CLASS III (Normal Duty) 1.Agitators–solidorsemi-solids 2. Batchers – textile 3.Blowersandfans–centrifugalandlobe 4.Bottlingmachines 5.Compressors–allcentrifugal,screw 6. Elevators – bucket, non-uniformly loaded or fed 7.Feeders–apron,belt,screworvane 8.Fillingmachines–can-type 9.Mixers–continuous10.Pumps–twoormorecylinders11.Conveyors–uniformlyloaded12.Dredgepumps(allowforshockloading)13.Locomotiverailroadshuttles
Duty Class III: The clutch will engage within three seconds, never heat the pressure platemorethan100ºF(56ºC)aboveambient,andonceengagedisoperatedforoneormorehours before disconnecting. The maximum horsepower which the clutch can absorb is given inClassIIITable.
Examples: Engine PTO starting average loads, and clutches whose starting load is up to 1.4 times the running load. Blowers, fans, screw compressors, conveyors and similar normal-duty drives.
CLASS IV (Heavy Duty) 1.Cranesandhoists–workingclutch 2.Crushers–oreandstone 3.Chippers–woodtubgrinders* 4.Drums–barking* 5.Compressors–loberotaryplus3ormorecylinderreciprocatingtype 6. Haulers – car puller and barge-type 7.Machines–impactloadtypes* 8.Mills–ball-type 9. Paper mill machinery – except calendars and driers10.Presses–brickandclay11.Mudpumps12.Roadplaners
Duty Class IV: The clutch will engage within four seconds, never heat the pressure plate more than150ºF(83ºC)aboveambient,andonceengagedisoperatedforoneormorehoursbeforedisconnecting. The maximum horsepower which the clutch can absorb is given in ClassIVTable.
Examples: Engine PTO starting heavy loads such as rock crushers, mud pumps, and other large inertia machinery and clutches whose starting load is up to 1.8 times the running load typical of heavy-duty drives.
CLASS V (Extreme Heavy Duty)DUTY CLASS V REQUIRES FACTORY REVIEW 1.Compressors–oneandtwocylinderreciprocating 2.Calendersanddriers–papermill 3.Mills–hammer-type 4.Shakers–reciprocating-type 5.Automobileshredders
For reciprocal compressors and applications where high torsionals can be experienced,aflexiblecouplingmaybemountedbetweenclutchandflywheel.
Duty Class V: The clutch is used to start large inertia loads which require four seconds to start the largest load, with the longest slip period per engagement not to exceed ten seconds. Theclutchmustbeselectedaccordingtoitshorsepowerabsorptioncapability.Clutchapplica-tionsinthisDutyClass,orthosewhichrequirefrequentengagements,requirefactoryreview.ContactGeneralProductsApplicationdepartmentforconsultationonthedrive.
1DimensionshownisforNo.4andNo.6Housings;2.63"forNo.5.2 DimensionshownisforNo.1,No.2andNo.3housings;2.16"forNo.4.3+.0000and-.0006.4 Furnished with spherical roller main bearings.5+.0000and-.0008.6 Sealed roller bearing.72.13"DIMisnonSAEstd.For11.5"OCclutch.8Faceofflywheelhousingtobottomofpilotboreinflywheel.
STANDARD POWER TAKE-OFFSDimensionsofTwinDiscindustrialPTOswithdriveringandovercenterclutchconformtotherecommendationsofSAEJ621(latestrevision)unlessnoted.
USE A CERTIFIED PRINT FOR INSTALLATIONNOTE:PTOmodelswithOP designation have oil-lubricated main bearings. All other models have grease-lubricated main bearings.
IMPORTANT NOTICE1.Asupportplateforone-plate14"andsmallerPTOs(exceptSP-311P)isnotrequired.2.Asupportplateforthree-plate11"andtwo-andthree-plate14"PTOsisrequiredinside-load
applications and is recommended for in-line applications. 3.Asupportplatefor18"andlargerPTOsisrequiredforbothside-loadandin-lineapplications.
H Y D R A U L I C & M E C H A N I C A L P T O S | G E A R B O X E S | C L U T C H E S | P U M P D R I V E S | T O R Q U E C O N V E R T E R S | T R A N S M I S S I O N S
Twin Disc has the best ways to transform power into productivity. Our wide range of power transmission products and nearly a century of applications make OEM “engineering in” or aftermarket replacement easy and economical. Plus, all Twin Disc products offer renowned reliability, low operating costs and a global support network of distributors and service dealers. For more information,
visit twindisc.com/productsupport. For assistance regarding a specific application, please contact [email protected].