Unintended Machine Movement
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
Secure the machine or disable/disconnect the mechanism while servicing to protect against unintended
movement.
Start-Up Procedure
Prior to installing the pump, inspect for damage that may have occurred during shipping.
Follow this procedure when starting-up a new pump installation or when restarting an installation in
which the pump has been removed and re-installed on a machine. Ensure pump has been thoroughly
tested on a test stand before installing on a machine.
C
Caution
M12X1.75 x 40mm Grade 10.9 minimum with hardened washer (ASTM F436M or ISO 7089 300HV) must
be used to mount the pump. Using M14 screws may cause issues when mounting.
1. Ensure that the machine hydraulic oil and system components (reservoir, hoses, valves, fittings, and
heat exchanger) are clean and free of any foreign material.
2. Install new system filter element(s) if necessary. Check that inlet line fittings are properly tightened
and there are no air leaks.
3. Install the pump and a 50 bar [1000 psi] gauge in the charge pressure gauge port M.
4. Fill the housing by adding filtered oil in the upper case drain port.
If the control is installed on top, open the construction plug in the top of the control to assist in air
bleed.
5. Fill the reservoir with hydraulic fluid of the recommended type and viscosity; fill inlet line from
reservoir to pump.
Use a 10-micron filler filter.
6. Disconnect the pump from all control input signals.
Do not disconnect a FDC control from control input signals. Due to the fail safe function the pump
will stroke in case of sufficient servo pressures. During start up provide a signal to keep the pump in
neutral.
7. Close construction plug removed in the step 4.
C
Caution
After start-up the fluid level in the reservoir may drop due to system components filling. Damage to
hydraulic components may occur if the fluid supply runs out. Ensure reservoir remains full of fluid
during start-up. Air entrapment in oil under high pressure may damage hydraulic components. Check
carefully for inlet line leaks. Do not run at maximum pressure until system is free of air and fluid has
been thoroughly filtered.
8. Use a common method to disable the engine to prevent it from starting.
9. Crank the starter for several seconds.
C
Caution
Do not to exceed the engine manufacturer’s recommendation. Wait 30 seconds and then crank the
engine a second time as stated above.
This operation helps to remove air from the system lines.
10. Refill the reservoir to recommended fluid level.
11. When the gauge begins to register charge pressure, enable and start engine.
Let the engine run for a minimum of 30 seconds at low idle to allow the air to work itself out of the
system.
12. Check for leaks at all line connections and listen for cavitation.
Service Manual
H1P 069—H1P 250 Axial Piston Single Pumps
Initial Startup Procedures
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©
Danfoss | September 2020
AX152886482551en-000504