Danfoss H1 Basic Information

Bypass function
The single pump HPRV valve also provides a loop bypass function when each of the two HPRV hex plugs
are mechanically backed out 3 full turns. Engaging the bypass function mechanically connects both A & B
sides of the working loop to the common charge gallery. The bypass function allows a machine or load to
be moved without rotating the pump shaft or prime move.
Bypass function not available for tandem pumps.
C
CAUTION
Excessive speeds and extended load/vehicle movement must be avoided. The load or vehicle should be
moved not more than 20 % of maximum speed and for a duration not exceeding 3 minutes. Damage to
drive motor(s) is possible. When the bypass function is no longer needed care should be taken to reseat
the HPRV hex plugs to the normal operating position.
System schematic, single pump
A
B
MA
S
M3
C2
C1
M4
M5
MBL4
L2
M6 1 2
R2
R1
M14
F00B F00A
CW
P003 418E
System schematic, tandem pump
C1
C1
C2C2
M14
M14
CW
F00B
F00A
F00B F00A
A
B
MA
E
C D
MD
MB
M3
L3
MC
M4
M5
M4
M5
PTO
X7
P003 207E
Basic Information
H1 Axial Piston Pumps, Single and Tandem
Operation
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©
Danfoss | April 2017 11062168 | BC00000057en-US0602

Danfoss H1 Specifications

General

Brand	Danfoss
Model	H1
Category	Water Pump
Language	English