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
.
1. Install a pressure gauge in port M1 or M2 to measure system pressure. Install a pressure gauge in case
drain port L1 or L2 to measure case pressure.
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. 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 adjusting plug until the desired setting is indicated on the
pressure gauge at port M1 or M2 (1). Clockwise rotation increases pressure, counterclockwise rotation
decreases; approximate gain 42 bar [610 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.
(1) P C setting is referenced to case pressure. Subtract case pressure from system pressure to compute
the actual setting.
4. While holding the position of the PC adjusting plug, torque the PC set screw to 7.5 - 10.8 N•m [5.5 - 8
lbf•ft].
5. Stop the prime mover, remove the pressure gauges, and return the system to its normal operating
configuration.
Pressure change
Control option
PC adjustment
LS adjustment
LS, LD, LB, LE, PC, RP
42 bar/rev [609 PSI/rev]
17.2 bar/rev [250 PSI/rev]
BB, BC, BP, BS
36 bar/rev [534 PSI/rev]
AB, AC, AD, AJ, AS
8.5 bar/rev [123 PSI/rev]
Service Manual
Series 45 E Frame Open Circuit Pumps
Adjustments
24 |
©
Danfoss | September 2016
AX00000024en-US0401
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