General
Follow this procedure when starting-up a new D1 installation or when restarting an installation in which
the pump has been removed.
Prior to installing the pump, inspect for damage incurred during shipping. Make sure all system
components (reservoir, hoses, valves, fittings, heat exchanger, etc.) are clean prior to filling with fluid.
Start-up Procedure
1. Connect the pump to the prime mover.
Ensure that the pump shaft is properly aligned with the shaft of the prime mover. Alignment should
be within 0.25 mm and the angle must not exceed 0.2°.
C
Caution
Incorrect shaft alignment may result in damage to drive shaft, bearings, or seal which can cause
external oil leakage.
2. Fill the reservoir with a recommended hydraulic fluid.
Always filter fluid through a 10 micron filter while pouring into the reservoir. Never reuse hydraulic
fluid.
3. Fill the main pump housing with clean hydraulic fluid. Pour filtered oil directly into the upper most
case drain port.
4. Fill the inlet line leading from the pump to the reservoir. Check the inlet line for properly tightened
fittings and be certain it is free of restrictions and air leaks.
5. To ensure the pump stays filled with oil, install the case drain line in the upper most case drain port.
6. Install a gauge at port MB to monitor system pressure during start up.
Follow recommendations in the vehicle / machine operator’s manual for prime mover start up
procedures.
7. Switch system to free circulation or to lowest pressure, jog the prime mover or run at the lowest
possible speed until pump and all pipes are filled and free from air bubbles. Raise pressure setting
only when all air is removed.
Let the pump work at reduced pressure for 5 - 10 min, check if all pipes and connections are leak-free
and tight.
8. Check the suction pressure at port S of the axial piston pump at nominal speed and maximum flow,
make sure it is in allowable range.
9. Check the case drain pressure at the connected port L1 or L2 at maximum pressure, make sure it is in
allowable range.
10. Shut down the prime mover and remove the pressure gauge. Replace plug at port MB.
11. Check the fluid level in the reservoir; add clean filtered fluid if necessary.
The pump is now ready for operation.
Service Manual
D1 High Power Open Circuit Pumps Size 65/130/145/193/260
Initial start-up procedures
©
Danfoss | July 2019
L1527453 | AX00000292en-CN0201 | 31