General Guide

Hydraulic equipment maintenance recommendations:

• Maintain regularly your hydraulic equipment. Keep it away from dust and corrosive or dry atmosphere.
• The equipment is warranted 1 year against manufacturing defects. Abusive or unsuitable use, modification of equipment and use of improper oil are not covered by the warranty.
• Hydraulic equipments must be only repaired by a qualified hydraulic technician.
• Our after sales service is at your disposal for any technical advise or equipment maintenance. Don’t hesitate to contact us.

Security and use advice

Basics

Definitions – Formulas – Units

Force :

The force developed by a cylinder corresponds to hydraulic pressure times its effective area.

F(T) = P x S / 1000

F(kN) = P x S / 100

Units :
• F : Force in kN or in Ton
• P : Pressure in bar (kg/cm2)
• S : Effective area in cm2

Cylinder oil capacity :

The volume required by a cylinder corresponds to its effective area times its stroke.

Vu = S x C

If your equipment is composed by several cylinders, you have to add oil capacity of each cylinder to get total oil capacity of the equipment.

Oil flow :

The oil flow is generated by the hydraulic pump. It is the oil volume that gives the pump in a certain period.

Units :
• l/min (liters/minute) : Electric, gasoline, air powered hydraulic pump
• cm3/stroke : Hand pump (about 40 strokes/min)

Cylinder’s stroke when driven by a hand pump :

The rod moves by a certain stroke (C) at each hand pump action.
This stroke depends on hand pump oil flow (Q in cm3 /pump stroke) and the cylinder effective area (S).

Units :
• C : Stroke in mm
• Q : Flow in cm3 /stroke
• S : Effective area in cm²

Cylinder travel speed :

The cylinder travel speed depends on pump oil flow (l/min) and cylinder effective area (S).

Units :
• V : Speed in mm/s
• Q : Flow in l/min
• S : Effective area in cm2

Pressure :

1 bar = 10^5 Pa = 14,5 psi
1 Pa (Pascal) = 1 N/m2
1 psi = 0,069 bar

Force :

1 kgf (kg force) = 9,81 Newton
1 N (Newton) = 0,1019 kgf
1 kN = 1000 N = 101,9 kgf

Length :

1 mm = 0,039 in (inch)
1 in = 25,4 mm

Threading equivalences :