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Model SPD-6
Servo pressure is the pressure in the servo system and is supplied from the high side of the loop to keep
the motor at the required displacement.
Case pressure
Under normal operating conditions, the rated case pressure must not be exceeded. During cold start,
case pressure must be kept below maximum intermittent case pressure. Size drain plumbing accordingly.
Caution
Possible component damage or leakage.
Operation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,
causing external leakage. Performance may also be affected since charge and system pressures are
referenced to case pressure.
External shaft seal pressure
In certain applications, the output shaft seal may be exposed to external pressures. The shaft seal is
designed to withstand an external pressure up to 0.25 bar [3.6 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 published 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 too 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 that the fluid viscosity remains in the recommended
range.
The minimum viscosity should be encountered only during brief periods of maximum ambient
temperature and severe duty cycle operation.
The maximum viscosity should be encountered only at cold start.
Service Manual H1B 060/080/110/160/250 Bent Axis Motors
Operating parameters
11024924 • Rev CB • February 2015 27
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