Danfoss LDU21C Service Manual page 14

Service Manual
LDU21C Closed Circuit Axial Piston Transmission
Operating Parameters
Case Pressure
Viscosity
Temperature
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14 | Danfoss | April 2025
Do not exceed rated case pressure under normal operating conditions. During cold start, keep case
pressure below maximum intermittent case pressure. Size drain plumbing accordingly.
C
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. This condition may also affect performance since charge and system pressure
are referenced to case pressure.
Maintain fluid viscosity within the recommended range for maximum efficiency and bearing life.
Minimum viscosity should only occur during brief occasions of maximum ambient temperature and
severe duty cycle operation. Maximum viscosity should only occur at cold start. Limit speeds until the
system warms up. Refer to Fluid specifications in LDU21C Technical Information Manual
BC282717470618.
Maintain fluid temperature within the limits shown in the Technical Specifications section of LDU21C
Technical Information Manual BC282717470618. Minimum temperature relates to the physical properties
of the component materials. Cold oil will not affect the durability of the pump components, however, it
may affect the ability of the pump to provide flow and transmit power. Maximum temperature is based
on material properties. Don't exceed it. Measure maximum temperature at the hottest point in the
system. Refer to Fluid Specifications in LDU21C Technical Information Manual BC282717470618.
Ensure fluid temperature and viscosity limits are concurrently satisfied.
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