External shaft seal pressure
In certain applications, the input shaft seal may be exposed to external pressures. The shaft seal is
designed to withstand an external pressure up to 0.4 bar [5.8 psi] above the case pressure. The case
pressure limits must also be followed to ensure the shaft seal is not damaged.
Temperature and viscosity
Temperature
The high temperature limits apply at the hottest point in the transmission, which is normally the motor
case drain. The system should generally be run at or below the quoted rated temperature.
The maximum intermittent temperature is based on material properties and should never be
exceeded.
Cold oil will generally not affect the durability of the transmission components, but it may affect the
ability of oil to flow and transmit power; therefore temperatures should remain 16 °C [30 °F] above the
pour point of the hydraulic fluid.
The minimum temperature relates to the physical properties of component materials.
Size heat exchangers to keep the fluid within these limits. Danfoss recommends testing to verify that
these temperature limits are not exceeded.
Viscosity
For maximum efficiency and bearing life, ensure the fluid viscosity remains in the recommended range.
The minimum viscosity should be encountered only during brief occasions of maximum ambient
temperature and severe duty cycle operation.
The maximum viscosity should be encountered only at cold start.
Basic Information
H1 Axial Piston Pumps, Single and Tandem
Operating parameters
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©
Danfoss | April 2017 11062168 | BC00000057en-US0602
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