Step 1  Calculate Approximate Kingpin Tourque (in/lbs) 
Weight on Steered Axle (lbs) 


Coefficient of Friction 


Nominal Tire Width (in) 


Kingpin Offset at Ground Intersection (in) 


DriveFactor (2 = steered wheels driven, 3 = locked) 


Kingpin Tourque (in/lbs) 

Step 2  Calculate Approximate cylinder force 
Minimum Radius Arm (in) 


Cylinder Force (lbs) 

Step 3  Determine pressure rating of system 
Pressure rating of pump (psi) 

Step 4  Calculate required Cylinder Area (sq. in) 
Cylinder Area (sq. in) 

Step 5  Determine type of cylinder used 
Style 


(1 = single balanced) 

(2 = single unbalanced) 

(3=cross connected unbalanced) 
Step 6  Determine diameter of shaft (rod) of cylinder(s) 
Shaft diameter (in) 

Step 7  Determine required cylinder stroke (in) 
Cylinder Stroke (in) 

Step 8  Calculate approximate required cylinder bore (in) 
Cylinder Bore (in) 

Step 9  Calculate swept Volume of Cylinder(s) (cu. in) 
Bore diameter (in) 


Swept Volume (Cu. in.) 

Step 10  Calculate required steering unit 
Number of turns lock to lock 


Valve displacement required (cu. in./rev) 

Step 11  Determine displacement of nearest steering unit 
Valve displacement of actual unit (cu. in./rev) 

Step 12  Calculate turns from lock to lock 
Turns lock to lock (One Way) 


Turns lock to lock (Other way) 

Step 13  Calculate minimum pump flow (gpm) 
Fastest Steering speed required (rev/sec) 


Minimum Pump Flow Required (gpm) 
