Danfoss 45 Frame K2 Series, Service Manual

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Item Description Gauge Port size Wrench size Torque
M2
1
Gauge port 300 bar [5000 psi] 9/16-18 1/4 inch internal hex 51 N•m [38 lbf•ft]
M14 4 mm internal hex 31 N•m [23 lbf•ft]
L1 Case drain port 10 bar [100 psi] 7/8-14 3/8 internal hex 95 N•m [70 lbf•ft]
PC adj. screw PC adjustment screw - - 6 mm internal hex -
PC set screw PC set screw - - 4 mm 9 N•m [7 lbf•ft]
1
The M2 port is not available as a standard option.
LS control
The LS setting is indicated in the pump model code. Refer to the Series 45 Open Circuit Axial Piston Pumps
Technical Information Manual , 520L0519, for more information.
Before performing adjustments, read Pressure measurement , for recommendations.
1. Install a pressure gauge in port M2 (or equivalent system pressure measurement port if M2 not
present) to measure system pressure. Install a pressure gauge in drain port L1 or L2 to measure case
pressure. Tee-in a gauge to the LS / remote PC signal line (port X).
W
Warning
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing
serious injury and/or infection. Relieve pressure in the system before removing hoses, fittings,
gauges, or components.
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.
C
CAUTION
Contamination can damage internal components and void the manufacturer’s warranty. Take
precautions to ensure system cleanliness when removing and reinstalling system lines.
2. Start the prime mover and allow fluid to reach normal operating temperature. Slowly operate a
hydraulic function which will demand approximately half flow from the pump, but keep system
pressure below the PC set point.
3. Loosen the LS set screw. While watching the pressure gauges, turn the LS adjustment screw until the
desired pressure differential between the system port gauge (port M2 if available) and port X is
achieved. Clockwise rotation will increase the setting, counterclockwise rotation will decrease;
approximate gain = 12 bar [170 psi] per turn.
4. While holding the position of the LS adjustment screw, torque the LS set screw to 9 N•m [7 lbf•ft].
5. Operate a hydraulic function to its full extension loading the pump at maximum pressure and zero
flow.
6. Loosen the PC set screw and turn the PC adjustment screw until the desired setting is indicated on
the pressure gauge at port M22. Clockwise rotation will increase pressure, counterclockwise rotation
will decrease; approximate gain = 35 bar [507 psi] per turn.
1
If the pressure does not increase, an external system relief valve may require adjustment. External
system relief valve must be set above the PC setting for proper operation.
7. While holding the position of the PC adjustment screw, torque the PC set screw to 9 N•m [7 lbf•ft].
1
PC setting is referenced to case pressure. Subtract case pressure from system pressure to compute the actual setting.
Service Manual
Series 45 Frame K2 Open Circuit Axial Piston Pumps
Adjustments
24 | © Danfoss | April 2017 AX00000301en-US0101