Symbols used in Danfoss literature
WARNING may result in injury
Tip, helpful suggestion
CAUTION may result in damage to product or
property
Lubricate with hydraulic fluid
Reusable part
Apply grease / petroleum jelly
Non-reusable part, use a new part
Apply locking compound
Non-removable item
Inspect for wear or damage
Option - either part may exist
Clean area or part
Superseded - parts are not interchangeable
Be careful not to scratch or damage
Measurement required
Note correct orientation
Flatness specification
Mark orientation for reinstallation
Parallelism specification
Torque specification
External hex head
Press in - press fit
Internal hex head
Pull out with tool – press fit
Torx head
Cover splines with installation sleeve
O-ring boss port
Pressure measurement/gauge location or
specification
The symbols above appear in the illustrations and text of this manual. They are intended to communicate
helpful information at the point where it is most useful to the reader. In most instances, the appearance
of the symbol itself denotes its meaning. The legend above defines each symbol and explains its purpose.
General description of H1 family hydrostatic pumps
The H1 family of closed circuit variable displacement axial piston pumps is designed for use with all
existing Danfoss hydraulic motors for the control and transfer of hydraulic power. The H1 axial piston
variable displacement pumps are of cradle swash-plate design and are intended for closed circuit
applications.
Flow direction is reversed by tilting the swash-plate to the opposite side of the neutral (zero
displacement) position. The flow rate is proportional to the pump input speed and displacement. The
latter is infinitely adjustable between zero and maximum displacement.
H1 pumps can be used together in combination with other Danfoss pumps and motors in the overall
hydraulic system.
•
Danfoss hydrostatic products are designed with 15 different displacements (cm³ [in³]):
045
053
060
068
069
078
089
100
115
130
147
165
210
250
280
45.0
[2.75]
53.8
[3.28]
60.4
[3.69]
68.0
[4.15]
69.0
[4.22]
78.0
[4.76]
89.2
[5.44]
101.7
[6.21]
115.8
[7.07]
130.8
[7.98]
147.0
[8.97]
165.0
[10.07]
211.5
[12.91]
251.7
[15.36]
280.2
[17.10]
•
Danfoss hydrostatic products are designed with many different pressure, load-life and control
capabilities:
Service Manual
H1P 069—H1P 280 Axial Piston Single Pumps
Introduction
©
Danfoss | January 2021
AX152886482551en-000601 | 7