Filtration, cleanliness level and β
x
-ratio (recommended minimum)
Cleanliness per ISO 4406
22/18/13
Efficiency β
x
(charge pressure filtration)
β
15-20
= 75 (β
10
≥ 10)
Efficiency β
x
(suction and return line filtration)
β
35-45
= 75 (β
10
≥ 2)
Recommended inlet screen mesh size
100 – 125 µm
External radial shaft loads
The pumps are designed with bearings that can accept some external radial loads. The external radial
shaft load limits are a function of the load position and orientation, and the operating conditions of the
unit. External radial shaft loads impact lifetime. For lifetime calculations please contact Danfoss Power
Solutions representative.
The maximum allowable radial load (R
e
) is based on the maximum external moment (M
e
) and the
distance (L) from the mounting flange to the load. It may be determined using the following formula:
Radial load position
P003 318E
L
270° R
e
R
e
M
e
180° R
e
90° R
e
0° R
e
M
e
= shaft moment
L = flange distance
R
e
= external force to the shaft
Thrust loads should be avoided. Contact factory in the event thrust loads are anticipated.
Bearing life H1P 069/078
Maximum external shaft moment based on shaft deflection (both sizes 069/078):
M
e
= 109 N•m [965 lbf•in]
All external shaft loads affect bearing life. In applications with external shaft loads, minimize the impact
by positioning the load at 0° or 180° as shown in the figure. Danfoss recommends clamp-type couplings
for applications with radial shaft loads.
Contact your Danfoss representative for an evaluation of unit bearing life if you have continuously
applied external loads exceeding 25 % of the maximum allowable radial load (R
e
) or the pump
swashplate is positioned on one side of center all or most of the time.
Mounting flange loads H1P 069/078
The moments shown below apply for top or side control orientation.
Technical Information
H1 Axial Piston Single Pumps, Size 069/078
Technical specifications
11062169 • Rev 0700 • November 2015 7
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