Hydraulic Unit Life - Sauer Danfoss 40 Series Technical Information

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Series 40 Axial Piston Pumps
Technical Information
System design parameters
180° External radial shaft load
F
Direction of external shaft load
90 Re
Axis of swashplat e
rotation
180 Re
Hydraulic unit life is defined as the life expectancy of the hydraulic components. It is
a function of speed and system pressure; however, system pressure is the dominant
operating variable. High pressure, which results from high load, reduces expected life.
Design the hydraulic system to a projected machine duty cycle. Know the expected
percentages of time at various loads and speeds. Ask your Sauer-Danfoss representative
to calculate an appropriate pressure based your hydraulic system design. If duty cycle
data is not available, input power and pump displacement are used to calculate system
pressure.
All pressure limits are differential pressures (referenced to charge pressure) and assume
normal charge pressure.
Series 40 pumps will meet satisfactory life expectancy if applied within the parameters
specified in this bulletin. For more detailed information on hydraulic unit life see
BLN-9884, Pressure and Speed Limits.
520L0635 • Rev EH • June 2009
L
B
R
e
T
e
0 Re
End view
of shaf t
270 Re
P100 595E
F
0 R
b
e
CW
CCW
90 R
e
180 R
e
270 R
e
P100 594E
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