Operating Parameters; Pressure; Speed; Fluid - Danfoss D1 Series Service Manual

Service Manual
D1 High Power Open Circuit Pumps Size 65/130/145/193/260

Operating parameters

D1P pressure overview
D1P speed overview
D1P fluid overview
© Danfoss | July 2019
Maximum
The highest recommended outlet (application). Operating at or below this pressure
working should yield satisfactory product life. For all applications, the load should move below

pressure

this pressure. This corresponds to the maximum allowable pressure compensated
control setting.
Maximum
The highest intermittent (t<1s) outlet pressure allowed. Maximum machine load
(peak) pressure
should never exceed this pressure, and pressure overshoots should not exceed this
pressure.
Inlet pressure
The absolute pressure in the pump suction port, it is related to pump speed. Make
sure it is in the allowable range, see
Case pressure
The case pressure at the ports L1 and L2 may be a maximum of 1.2 bar [17.4 psi]
higher than the inlet pressure at the port S but not higher than 2 bar. Size drain
plumbing accordingly and connect it to tank directly. The housing must always be
filled with hydraulic fluid.
Rated
The fastest recommended operating speed at full displacement and at least 0.6 bar [8.7

speed

psi] abs with charge pump (0.8 bar [11.6 psi] abs without charge pump) inlet pressure.
Operating at or below this speed should yield satisfactory product life.
Maximum The highest recommended operating speed at full power conditions. Operating at or
speed
beyond maximum speed requires positive inlet pressure and/or a reduction of pump
outlet flow. Refer to
Inlet pressure vs. speed
1.2
1.1
1.0
0.9
0.8
Minimum
The lowest operating speed allowed. Operating below this speed will not yield
speed satisfactory performance.
Caution! Threat to pump life!
Working outside of the pump's operating parameters may result in shortened life expectancy of the
pump.
Always work within the operating conditions of the pump application.
With accurate duty cycle information, your Danfoss Power Solutions representative can assist you in
calculating expected pump life.
Ratings and performance data for D1 pumps are based on operating with premium hydraulic fluids
containing oxidation, rust, and foam inhibitors. These include premium turbine oils, API CD engine oils
D1 pump specifications
Inlet pressure vs. speed on page 23, chart below.
Pabs=1.5 bar [21.8 psi]
Pabs=1 bar [14.5 psi]
0.9
Displacement V /V
g gmax
on page 25.
1.0
P400076
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