Initial Start-Up Procedures; General; Start-Up Procedure - Danfoss K Frame Series Service Manual

Service Manual
K and L Frame Variable Motors, Cartridge Mount

Initial start-up procedures

General

Start-up procedure

12 | © Danfoss | July 2017
Follow this procedure when starting-up a new motor installation or when restarting an installation in
which the motor has been removed.
W
Warning
Unintended vehicle or machine movement hazard
When using the RDM in combination with S45 open circuit pumps with LS or EPC be aware that there will
likely be motor movement as long as the engine is turning. Due to the LS-setting of the pump, a standby
pressure will remain in the system even if the normally closed control is fully energized. Lowest standby
pressures to the motor, 15-18 bar or above, may be enough to turn the RDM and has the potential to
cause injury or damage.
Prior to installing the motor, inspect for damage incurred during shipping. Make certain all system
components (reservoir, hoses, valves, fittings, heat exchanger, etc.) are clean prior to filling with fluid.
1. Fill the reservoir with recommended hydraulic fluid. Always filter fluid through a 10 micron filter
when pouring into the reservoir. Never reuse hydraulic fluid.
2. 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.
3. Fill the pump and motor housing with clean hydraulic fluid. Pour filtered oil directly into the upper
most case drain port.
4. To ensure the pump and motor stay filled with oil, install case drain lines into the upper most case
drain ports.
5. Install a 0 to 35 bar [0 to 500 psi] gauge in the charge pressure gauge port of the pump to monitor
system pressure during start up.
Follow recommendations in the vehicle / machine operator's manual for prime mover start up
procedures.
6. While watching the pressure gauge, jog the prime mover or run at the lowest possible speed until
system pressure builds to normal levels (minimum 11 bar [160 psi]). Once system pressure is
established, increase to full operating speed. If system pressure is not maintained, shut down the
prime mover, determine cause, and take corrective action. Refer to
7. Operate the hydraulic system for at least fifteen minutes under light load conditions.
8. Check and adjust pump control settings as necessary after installation.
9. Shut down the prime mover and remove the pressure gauge. Replace plug at the charge pressure
gauge port.
10. Check the fluid level in the reservoir; add clean filtered fluid if necessary.
The motor is now ready for operation.
Troubleshooting on page 14.
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