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# Hydraulic Accumulator Formulas

Formula For:Word FormulaLetter Formula
Pressure or Volume
w/ Constant “T” (Temperature)
Original Pressure x Original Volume = Final Pressure x Final VolumeP1 V1  =  P2 V2   Isothermic
Pressure or Temperature
w/ Constant “V” (Volume)
Original Pressure x Final Temperature = Final… Continue reading

## Hydraulic Capacity & Volume Equivalents

Cubic InchesCubic FeetCubic Yards
CU Inches1..0005787.00002143
CU Feet1,728.1..037037
CU Yards46,656.27.1.
Liters61.0234.0353145.001308
U.S. Gallons231..133681.004951
Imp. Gallons277.274.160549.0059429
Lbs Water27.6798.0160184.0005929

# Thermal Formulas

Formula For:Word FormulaLetter Formula
Reservoir Cooling Capacity
Heat (BTU/HR) =
2 x Temperature Difference Between Reservoir Walls And Air (ºF) x Area of Reservoir (Sq.Ft.)
BTU/Hr = 2.0 xT x A
Heat in Hydraulic Oil (approx.)
Due to System Inefficiency(SG=.89-.92)
Heat (BTU/HR) =

# Hydraulic Cylinder Formulas

Cylinder Formulas For:

Word Formula

Letter Formula

Cylinder Area
In Square Inches
Area = x Diameter2 (Inches)
A = r2
A =  or  A = .785D2
Cylinder Force
In Pounds, Push or Pull
Force = Pressure (psi) x Net Area (Square Inches)… Continue reading

# Hydraulic Pump Formulas

Pump Formulas For:Word FormulaLetter Formula
Pump Outlet Flow
In Gallons/Minute
Flow =
Q =
Pump Input Power
In Horsepower Required
Horsepower Input =
HPIN =
or
Pump Efficiency
Overall in Percent
Overall Efficiency = X 100
Overall Efficiency = Volumetric Eff. x Mechanical Eff.
EffQV

# Hydraulic Fluid Formulas

Hydraulic Fluid Formulas For:Word FormulaLetter Formula
Velocity Through Piping
In Feet/Second Velocity
Velocity =V =
Compressibility of Oil
In Additional Required Oil To Reach Pressure
Volume
VA =
* Approximately 1/2 % per 100 psi
Compressibility of a FluidCompressibility =C(ß)=

## Hydraulic Formula Table

Formula For:Word FormulaLetter Formula
Fluid Pressure
In Pounds/Square Inch
Pressure = P = or
psi =
Fluid Flow Rate
In Gallons/Minute
Flow Rate = Q =
Fluid Power
In Horsepower
Horsepower = HP =

All parts, with the exception of a few, are lubricated by the hydraulic oil in the circuit. Pay particular attention to keeping oil in the circuit clean. Whenever there is a hydraulic component failure (cylinder, pump, valve), and there may be metal particles in the system, the oil must be drained, the entire system flushed… Continue reading

WARNING: Before working on a telescopic cylinder mounted on a truck or trailer unit, use supports or holding devices that will absolutely prevent the body from accidentally lowering. Place control valve in the “LOWER” position to assure that all pressure has been relieved from the cylinder.

## Telescopic Cylinder Maintenance List

1. Packing, wipers and bushings… Continue reading

WARNING: Before working on a double acting telescopic cylinder mounted on a truck or trailer unit, use supports or holding devices that will absolutely prevent the body from accidentally lowering. Place control valve in the “LOWER” position to assure that all pressure has been relieved from the cylinder.