Static Torque Ratings

Selection Procedure

I. Calculate the torque requirement for the application using one of the following formula:

torque requirement calculation

II. Identify which service factor best identifies your application from the suggested service factor table located at the bottom of this page.

III. Adjust the torque requirement using the selected service factor.    T= Tc . SF or T=Tb . SF

IV. Decide which series best fits your drive.

V. Using the appropriate series torque pressure graph, determine the model size.

Vl. Determine if the Series and models can:

  1. Accommodate the shaft and key
  2. Operate at the required speed
  3. Fit within the available space

Vll. Determine the Drive Cup Mounting

Vlll. Call or fax Logan Clutch Corporation to review your selection and place your order. Application fact sheets are available online or from Logan Clutch.

HP = Horsepower
RPM = Clutch or Brake shaft speed
SF = Service Factor
T= Required Torque (Ib ft.)
Tb = Brake Torque (Ib. ft.)
Tc = Clutch Torque (Ib. ft.)
t = Time to stop (seconds)
WK2 = Total inertia to be stopped
(Ib.ft.2)
 

R Series Wet Operation

Model
PSI (Ratings in ft. lbs.)*
Bar (Ratings in Nm)
50 75 100 125 150 175 3.4 5.2 6.9 8.6 10.3 12.1
350 45 81 117 152 188 224 61 110 159 206 255 304
450 90 160 229 299 369 438 122 217 311 405 500 594
550 151 263 376 488 601 713 205 357 510 662 815 967
600 234 394 554 714 874 1034 317 534 751 968 1185 1402
700 345 566 788 1009 1230 1451 468 767 1069 1368 1668 1968
800 460 773 1085 1398 1711 2023 624 1048 1471 1896 2320 2743
900 233 753 1272 1792 2311 2831 316 1021 1725 2430 3134 3839

* Maximum recommended operating pressure 150 PSI (10.3) BAR
 

S Series Wet Operation

Model
PSI (Ratings in ft. lbs.)*
Bar (Ratings in Nm)
50 75 100 125 150 175 3.4 5.2 6.9 8.6 10.3 12.1
250 22 39 57 74 91 109 30 53 77 100 123 148
300 32 57 82 106 131 156 43 77 111 144 178 212
350 52 81 130 169 208 247 71 110 176 229 282 967
400 63 117 171 225 279 333 85 159 232 305 378 452
450 102 178 253 329 404 480 138 241 343 446 548 651
550 192 325 459 592 725 858 260 441 622 803 983 1163
600 281 465 648 832 1015 1198 381 631 879 1128 1376 1624
700 427 700 973 1246 1519 1792 579 949 1319 1690 2060 2430
800 511 849 1187 1525 1863 2201 693 1151 1610 2068 2526 2985
900 854 1422 1990 2559 3127 3695 1158 1928 2698 3470 4240 5010

* Maximum recommended operating pressure 150 PSI (10.3) BAR
 

P Series Dry Operation

Model
PSI (Ratings in ft. lbs.)*
Bar (Ratings in Nm)
60 70 80 90 100 4.1 4.8 5.5 6.2 6.9
350   97 119  141  164  186  132  161  191  222  252
450  189 232 276 319  362  256  315 374  433  491
550  351 427  503 579  655  476   579   682  785   888
600  507  612  716  821  926  687  830   971 1113  1256
800 1130  1367 1603  1840  2077  1532  1854 2174  2495 2816

*P torque values based on dry operating conditions.
Maximum recommended operating pressure 100 PSI (6.9) BAR
 

Suggested Service Factor Table

Duty
SF
Small inertia
Low Cycle Rate
Non-pulsating Load		 1.3 to 1.7
Large inertia
Low Cycle Rate
Non-pulsating Load		 1.7 to 2.2
Large inertia
High Cycle Rate Pulsating Load		 2.2 to 3.2

 

*P torque values based on dry operating conditions.
Maximum recommended operating pressure 100 PSI (6.9) BAR

A pressure regulator should be specified in the system to prevent over-pressurization of any Logan Clutch. The Logan warranty does not cover clutch failure due to over-pressurization. The highest pressure values in the torque tables are maximum ratings for Logan Clutches.

 

Example: Select a wet environment clutch

HP = 150
Clutch Speed = 800 RPM
Service Factor= 1.3
Available operating pressure = 150 psi.


wet environment clutch computation
T = 984 . 1.3 = 1280 lb. ft.
Choose model 800 in the R or S series.

Features:

  • Hydraulic Actuation.
  • The low profile, compact, Logan PTO design is suitable for workboats, fishing boats and pleasure craft.
  • The Logan PTO aids in the reduction of emissions, energy, fuel costs and wear and tear on auxiliary attachments.
  • Field retrofits with existing Twin Disc® style and ZF® style live PTO transmissions.

Advantages:

  • During Maneuvering – which requires reduction of main engine speed, the Logan PTO is used as a separate power source for bow and stern thrusters.
  • The PTO directly connects to a pump drive, which powers winches, reels, hoists, and deck pressure washers.
  • The PTO can be coupled to an alternator to supply electric power to other power consumers on the vessel.

ZF or Twin Disc Style Marine Transmission, Logan PTO, Hydraulic Pump

PTO 200 Specifications

PTO 200

 

Dimensions

SAE FACE
(input & output)		 B
4-bolt pattern		 B2
4 in
101.6 mm
 F
6.25 in
158.8 mm
SAE SPLINE
B/13T/16-32 DP
Input & Output
 C1
0.38 in
9.7 mm
 G
0.53 in
13.5 mm
A1
1.62 in
41.2 mm
 C2
0.50 in
12.7 mm
 H
3.537 in
89.8 mm
A2
1.88 in
47.7 mm
 D
7.22 in
183.4 mm
    
B1
3.999 in
101.6 mm
 E
1.22 in
31.0 mm
    

 

PTO 200 Specifications

  U.S. S.I.
Rated Torque (Maximum) 200 Ft.Lbs 271 Nm
Maximum HP 100 HP 75 KW
Maximum RPM 2800 RPM 2800 RPM
Rotation Bi-rotation Bi-rotation
Maximum Actuation Pressure 350 psi 24 Bar
Minimum Actuation Pressure 250 psi 17 Bar
Displacement (Maximum) 1.0 in3 16,4 cm3
Minimum Flow Rate Required 1.5 GPM 5.6 Liters/min
Operating Media at Clutch (Oil or Air) Standard Standard
Maximum Back Pressure to Tank 7 psi 0.5 Bar
Maximum Fluid Temperature 180° F 82° C
Material - Shaft Alloy Steel Alloy Steel
Material - Housing Aluminum Aluminum
External Finish - Shaft Alloy Steel Alloy Steel
External Finish - Housing Anodized Anodized
Wet input seal (Standard) 30 psi 2 bar
Weight (Approximate) 15 Lbs 6.8 Kg.


* Consult Logan for applications that require lower actuation pressure or increased torque and rpm requirements.
The torque capacity of the clutch is directly proportional to the operating pressure. Maintaining the lowest pressure possible to transfer the desired torque will enable the clutch to run cooler and extend the life span of the internal bearings.

Important: The SBB-200 Series Direct Drive PTO has been specially designed to actuate at higher pressures, (250-350 psi.) than the PTO-250, PTO- 500, and PTO-750 series clutches; which actuate between 80-120 psi.

 

Horsepower Required to Drive Hydraulic Pump

HP 25 50 75 100
Pump Size (GPM) 20 40 60 80

 

* HP = PSI x GPM / 1371.2 (1714 x 80% efficiency = 1371.2)
* 1 HP is required for each 1 GPM @ 1500 psi.

 

PTO 200 Series Static Torque Ratings

Bar (Ratings in ft. lbs.)
Model 250 300 350
200 240 295 350

 

PTO 200 Series Static Torque Ratings

Bar (Ratings in Nm)
Model 17 20 24
200 325 400 475

 

PTO 200 Series Shaft Options

Input Shaft/External
Output Shaft/Internal
*SAE B 13T/16-32 D.P. *SAE B 13T/16-32 D.P.
6B Parallel Side Spline SAE B 13T/16-32 D.P.
.875 O.D. with .250 Keyway .875 I.D. with .250 Keyway
.875 O.D. with .250 Keyway SAE B 13T/16-32 D.P.
SAE B 13T/16-32 D.P. .875 I.D. with .250 Keyway


*Standard configuration. Modified Standards available.

ZF is a registered trademark of ZF®

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