Case Pressure; Viscosity; Temperature - Danfoss LDT 21 Service Manual

Service Manual
LDT 21/24/32 Closed Circuit Axial Piston Transmission
Operating Parameters

Case pressure

Viscosity

Temperature

© Danfoss | June 2022
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.
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. Performance may also be affected since charge and system pressure are
additive 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 the
1. Maintain fluid temperature within the limits shown in the Technical Specification section.
Minimum temperature relates to the physical properties of the component materials. Cold oil may
affect the ability of the transmission to provide flow and transmit power.
Continuous temperature should not be exceeded for longer than 2 minutes (single event) or for
more than 2% of the application duty cycle. Operating the unit at or below continuous temperature
should yield satisfactory unit life. The application's cooling system shall be designed to maintain the
oil temperature below the continuous temperature limit.
Maximum intermittent temperature: is based on material properties. Don't exceed it.
2. Measure maximum temperature at the hottest point in the system.
Refer to the fluid specifications table
3. Ensure fluid temperature and viscosity limits are concurrently satisfied.
fluid specifications table.
for data.
AX417167456877en-000101 | 13