General
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.
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
Prior to installing the pump, inspect for damage that may have occurred during shipping.
MP1 start-up procedure
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.
Prior to installing the pump on a machine, inspect for damage and ensure pump has been thoroughly
tested on a test stand before installing on a machine.
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
Ensure the machine is secured or disable/disconnect the mechanism while servicing.
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. Install a 50 bar [1000 psi] gauge in the charge pressure gauge port M3.
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. Use a 10-micron filler
filter. Fill inlet line from reservoir to pump. Ensure construction plug in control is closed after filling.
6. Disconnect the pump from all control input signals.
7. Close construction plug removed in step 4.
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. Crank the starter for several
seconds. Do not exceed the engine manufacturer’s recommendation. Wait 30 seconds and then crank
the engine a second time as stated above. This operation helps remove air from the system lines.
Refill the reservoir to recommended full oil level.
9. 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. Check for leaks at
all line connections and listen for cavitation. Check for proper fluid level in reservoir.
10. When adequate charge pressure is established (as shown in model code), increase engine speed to
normal operating rpm to further purge residual air from the system.
Service Manual
MP1
Initial startup procedure
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Danfoss | April 2019 AX00000244en-000201 | 41
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