http://www.unimogfreunde.de/technik-tipp/hydraulik/umrechnungstabelle/Hydr_Calc.jpg
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Basic Formulas 


...For Hydraulic Pumps


OUTPUT FLOW

lpm = cm^3/r x rpm / 1000

gpm = in^3/r x rpm / 231


INPUT POWER

kW = l/min x bar / 600

hp = gpm x psi / 1714



...For Hydraulic Motors


SHAFT TORQUE 

Nm = bar x cm^3/r / 62.8

lb-in = psi x in^3/r / 6.28


SHAFT SPEED

rpm = 1000 x l/min / cm^3/r

rpm = 231 x gpm / in^3/r


OUTPUT POWER

kW = Nm x rpm / 9549

hp = lb-in x rpm / 63.025
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Volvo C306 6x6 KBN-713

Blueprint hydraulics:

140 bar & 59L/min

kW = l/min x bar / 600 = 13,7666kW = 18,4611hp 
[note WJM: NETTO output!....so bruto/input is much more, 25-30hp!]