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per SAE J183, M2C33F or G automatic transmission fluids (ATF), Dexron II (ATF) meeting Allison C-3 or
Caterpillar T0
‑
2 requirements, and certain specialty agricultural tractor fluids. For more information on
hydraulic fluid selection, see Danfoss Power Solutions publications 520L0463
Hydraulic Fluids and
Lubricants
, Technical Information, and 520L0465
Experience with Biodegradable Hydraulic Fluids
,
Technical Information.
D1P viscosity
Minimum Viscosity This should only occur during brief occasions of maximum ambient temperature
and severe duty cycle operation.
Maximum
Viscosity
This should only occur at cold start. Pump performance will be reduced. Limit
speeds until the system warms up.
Maintain fluid viscosity within the recommended range for maximum efficiency and pump life.
D1P temperature overview
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
Relates to material properties. Don’t exceed it. Measure maximum temperature at
the hottest point in the system. This is usually the case drain.
D1P fluid velocity
Choose piping sizes and configurations sufficient to maintain optimum fluid velocity, and minimize
pressure drops. This reduces noise, pressure drops, overheating and maximizes system life and
performance.
Recommended fluid velocities
System lines
6 to 9 m/sec
Suction line
1 to 2 m/sec
Case drain
3 to 5 m/sec
Typical guidelines; obey all pressure ratings.
Velocity equations
SI units
Q = flow (l/min)
A = area (mm²)
Velocity = (16.67•Q)/A (m/sec)
Service Manual
D1 High Power Open Circuit Pumps Size 65/130/145/193/260
Operating parameters
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Danfoss | July 2019
L1527453 | AX00000292en-CN0201