Use this tool to calculate key PTO component data and spec the appropriate components. Each section of the calculator can be completed separately. All calculations assume an International S13 as the engine model.
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Transmission PTO Details
Transmission PTO rotation
Transmission PTO turns on a counter-clockwise rotation. See diagram for details.
Single vs. dual transmission PTO
If spec’d with a single transmission PTO, the PTO will be located on the bottom position.
RPM ranges
The ideal range for Pump/PTO Speed and Engine Speed is between 900-1200 rpm. Limit time spent above 1200 rpm.
Transmission PTO calculations
The following formulas are used when calculating values.
  • PTO gear ratio = Pump/PTO speed ÷ Engine speed
  • Pump/PTO speed = Engine speed x PTO gear ratio
  • Engine speed = Pump/PTO speed ÷ PTO gear ratio
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T14 Transmission PTO

Calculate one of the unknown variables below to determine the best PTO to use on the T14 transmission.
More Transmission PTO Details
1. Select Calculation
Which would you like to calculate?
Will a single or dual PTO be used?
2. Inputs
Pump/PTO Speed (RPM)
Engine Speed (RPM)
Engine Speed must be between 600-2300 RPM
PTO Gear Ratio
Engine Speed (RPM)
Engine Speed must be between 600-2300 RPM
PTO Gear Ratio
Pump/PTO Speed (RPM)
3. Results
PTO Gear Ratio
Pump/PTO Speed - Low Split
rpm
Pump/PTO Speed - High Split
rpm
The ideal rpm range is between 900-1200 rpm. Limit time spent above 1200 rpm.
Engine Speed - Low Split
rpm
Engine Speed - High Split
rpm
The ideal rpm range is between 900-1200 RPM. Limit time spent above 1200 RPM.
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REPTO Details
REPTO Rotation
REPTO turns on a clockwise rotation. See diagram for details. The T14 PTO rotates counterclockwise, while the REPTO rotates clockwise.
RPM Ranges
The ideal range for Pump/PTO Speed and Engine Speed is between 900-1200 rpm. Limit time spent above 1200 rpm.
Transmission PTO calculations
The following formulas are used when calculating values.
  • Pump/PTO speed = Engine speed x PTO gear ratio
  • Engine speed = Pump/PTO speed ÷ PTO gear ratio
Rear Engine PTO Gear Ratio is fixed at 1.2:1
Learn more about the upcoming DIN 5462 4-Bolt REPTO
Please reference the sales information letter to learn about the standardized DIN 5462 4-Bolt REPTO flange.
Read the sales information letter
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S13 Rear Engine PTO (REPTO)

Calculate one of the unknown variables below to determine the best REPTO to use on the S13 engine.
More REPTO Details
1. Select Calculation
Which would you like to calculate?
2. Inputs
PTO Gear Ratio
1.2:1
Engine Speed (RPM)
Engine Speed must be between 600-2300 RPM
PTO Gear Ratio
1.2:1
Pump/PTO Speed (RPM)
3. Results
PTO Gear Ratio
Pump/PTO Speed
rpm
The ideal rpm range is between 900-1200 rpm. Limit time spent above 1200 rpm.
Engine Speed
rpm
The ideal rpm range is between 900-1200 RPM. Limit time spent above 1200 RPM.
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Bending Moment Details
Bending moment application
The bending moment calculation only applies to transmission pumps.
Bending moment calculations
The following formulas are used when calculating values. These formulas represent calculations in metric units.
Total pump system weight = Weight of adapter + Weight of pump

Adapter bending moment
  • Length = Weight of adapter x 9.81 x (Length of adapter ÷ 2)
  • Center of Gravity (CG) = Weight of adapter x 9.81 x CG Distance adapter
Pump bending moment
  • Direct Mount Length = Weight of pump x 9.81 x (Length of pump ÷ 2)
  • Direct Mount CG = Weight of pump x 9.81 x CG Distance pump
  • Adapter Length = Weight of pump x 9.81 x (CG Distance pump + Length of adapter)
  • Adapter CG = Weight of pump x 9.81 x (CG Distance pump + Length of )
System bending moment = Adapter bending moment + Pump bending moment
Read more on bending moment calculations
Reference pages 209-240 of the CT471 Body Builder Book for full explanations on bending moment calculations (note: bending moment calculation is consistent across truck models).
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Bending Moment

Identify the ideal pump weight for the PTO to avoid reaching a critical bending moment.
More Bending Moment Details
1. Select Calculation
Will an adapter be used to mount the PTO pump?
Calculate bending moment using...
Calculate bending moment using...
2. Inputs
Adapter Type
Weight of Pump
lbs.
Switch to kgs.
Length of Pump
in.
Switch to meters
Weight of Pump
lbs.
Switch to kgs.
Length of Pump
in.
Switch to meters
Adapter Type
Weight of Pump
lbs.
Switch to kgs.
Center of Gravity Distance - Pump
in.
Switch to meters
Weight of Pump
lbs.
Switch to kgs.
Center of Gravity Distance - Pump
in.
Switch to meters
3. Results
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Pump Flow and PTO Speed Details
Hi/Lo PTO Switch
The Hi/Lo PTO switch is a Diamond Logic feature. See your dealership if your truck is not equipped with this feature. Reference the diagram for an example of the switch.
Transmission PTO calculations
The following formulas are used when calculating values.
  • Pump flow = (Displacement x Pump speed) ÷ 1000
  • Pump/PTO speed = Engine speed x PTO gear ratio
Note: Hose diameter also impacts flow rate
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Pump Flow and PTO Speed

Calculate the amount of hydraulic fluid that will pump through the lines to determine the optimal type of pump to use.
More Pump Flow and PTO Speed Details
1. Select Calculation
Which would you like to calculate?
2. Inputs
Displacement
cu.in./rev
Switch to cc./rev
Pump Speed (RPM)
PTO Gear Ratio
Engine Speed (RPM)
Engine Speed must be between 600-2300 RPM
3. Results
Pump Flow
Pump Speed - Low
rpm
PumP Speed - High
rpm
Print Results
Print a PDF that includes a summary of any of the above sections that you’ve completed.