Removing Air Through The Ddp Outlet Port - Danfoss Digital Displacement DDP096 Technical Information

Technical Information
Digital Displacement® DDP096 pump and DPC12 controller
Mechanical installation
32 | © Danfoss | October 2023
brakes, fans or other auxiliary functions. This method can be used to remove build-up of air if the pump is
installed near the tank oil level or if during operation the pump is at or above the tank oil level (such as in
a vehicle on a slope).
Auxiliary pump
It is important that the pump case is as full as possible before spinning the shaft.
If the pump case is not at least half full, there is a risk of damaging the bearings and other internal
components.
Use moderate shaft speed (<1000 rpm) and check that the pump is operating correctly within half a
minute.
Check auxiliary pump priming requirements.

Removing air through the DDP outlet port

Air can be suctioned out of the DDP outlet port by temporarily connecting the inlet of a commissioning
pump to the outlet of the DDP. The outlet check valves will open and allow oil to fill the crankcase and all
piston chambers. This air removal process will remove most of the air, but some small air pockets may
remain in the case. This method can then leave time to connect the high-pressure system hose to the
DDP outlet port.
In the case of a multi-service system, connect the commissioning pump to the service connected to the
topmost pumplet of the DDP. Refer to
and services.
Commissioning pump
Extreme care should be taken with this method to ensure that oil is properly drawn through the pump
housing.
Ensure that the shaft is not spinning while the discharge port is not connected to the final hydraulic
circuit.
If the shaft is spinning, the DDP could pump and the outlet line could over-pressurize. Over-pressurizing
the outlet line creates a risk of injury and damage.
Multi-outlet pump on page 6 for more information on pumplets
BC306384089197en-000202