Hydraulic Kits for Excavators
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Useful Formulas

Below are some useful formulas.

CYCLE EXTEND TIME (sec):

Bore dia2 (in) X Stroke (in) X 0.2
gpm

CYCLE RETRACT TIME (sec):

Bore dia2 (in) Rod dia2 (in) X Strocke (in) X 0.2
gpm

GPM (CYCLE EXTEND):

Bore dia2 (in) X Stroke (in) X 0.2
Time (sec)

GPM (CYCLE RETRACT):

Bore dia2 (in.) Rod dia2 (in) X Stroke (in) X 0.2
Time (sec)

HYDRAULIC POWER (hp IN):

psi X gpm
1714

MECHANICAL POWER (hp OUT):

ft-lb X Cycle/min
33,000

CYLINDER FORCE (lb):

Pressure (psi) X dia2 (in) X 0.7854

 EFFICIENCY:

hp Out X 100%
hp In

 FT-LB:

33,000 X psi X gpm X Efficiency
1714 X Cycle/min

 
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