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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 080
Technical specifications
Fluid specifications
Determination of nominal motor size
©
Danfoss | December 2023
Fluid specifications
Features
Minimum intermittent
Viscosity
Recommended range
Maximum intermittent
Minimum
1)2)
Temperature range
Rated
Maximum intermittent
Required cleanliness per ISO 4406
Efficiency (charge pressure filtration)
Cleanliness and Filtration
Efficiency (suction / return line filtration)
Recommended inlet screen mesh size
1)
At the hottest point, normally case drain port.
2)
Minimum: cold start, short term t<3 min, p<50 bar, n<1000 rpm.
Based on SI units
V
• n
Q
=
g
e
1000 •
v
V
• p •
M
=
g
mh
e
20 •
M
• n
Q
• p •
P
=
e
=
e
e
9550
600
Q
• 1000 •
n =
e
v
V
g
Where:
Q
Input flow (l/min)
e
M
Output torque (N•m)
e
P
Output power (kW)
e
-1
n
Speed (min
)
V
Motor displacement per rev. (cm
g
p
High pressure (bar)
high
p
Low pressure (bar)
low
∆p
High pressure minus Low pressure (bar)
η
Motor volumetric efficiency
v
η
Mechanical-hydraulic efficiency
mh
η
Motor total efficiency (η
t
Based on US units
Q
=
e
M
=
e
t
P
=
e
n =
Where:
Q
e
M
e
P
e
n
3
V
/rev)
g
p
high
p
low
∆p
η
v
η
mh
η
• η
)
t
v
mh
All sizes
Unit
7 [49]
2
mm
/s
12-80 [66-366]
[SUS]
1600 [7416]
-40 [-40]
°C
104 [220]
[°F]
115 [240]
-
22/18/13
β
= 75 (β
15-20
β-ratio
β
= 75 (β
35-45
µm
100 – 125
V
• n
g
231 •
v
V
• p •
g
mh
2 •
V
• n • p •
g
t
396 000
Q
• 231 •
e
v
V
g
Input flow [US gal/min]
Output torque [lb•in]
Output power [hp]
Speed [rpm]
Motor displacement per rev. [in
High pressure [psi]
Low pressure [psi]
High pressure minus Low pressure [psi]
Motor volumetric efficiency
Mechanical-hydraulic efficiency
Motor total efficiency (η
• η
v
AX465363259664en-000102 | 13
≥ 10)
10
≥ 2)
10
3
/rev]
)
mh
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