Danfoss 45 Frame K2 Series, Service Manual

Page: 23 / 40

PC control
PC 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 case drain port L1 or L2 to measure
case pressure.
W
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.
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. Operate a hydraulic
function to its full extension, loading the pump at maximum pressure and zero flow.
3. Loosen the PC set screw and turn the PC adjustment screw until the desired setting is indicated on
the system pressure gauge (at port M2 or equivalent)
1
. Clockwise rotation will increase pressure,
counterclockwise rotation will decrease; approximate gain = 35 bar [507 psi] per turn.
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.
4. While holding the position of the PC adjustment screw, torque the PC set screw to 9 N•m [7 lbf•ft].
5. Stop the prime mover, remove the pressure gauges, and return the system to its normal operating
configuration.
PC control adjustment: Adjustment screw, set screw, and gauge locations shown
PC adjustment screw
L1
P109072
M2
PC set screw
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
© Danfoss | April 2017 AX00000301en-US0101 | 23