Pressure Override (Por) Valve Pressure Adjustment (Option For 180 Frame Size) - Danfoss 90 Series Service Manual

Service Manual
Adjustments

Pressure override (POR) valve pressure adjustment (option for 180 frame size)

32
Series 90 Pumps
Multi-Function Valve with Bypass Function Engaged
Opening bypass valve
allows flow to circuit
through multi-function valves
Bypass
actuator
Bypass actuator torque
Frame size
newer 030 – 100
130 – 250
Pressure override valve operation is explained in the
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.
1. Install two 1000 bar [10 000 psi] pressure gauges in the high pressure gauge ports (M1 and M2).
Install a 50 bar [1000 psi] pressure gauge in the pump charge pressure gauge port (M3).
2. Start the prime mover and operate at normal speed.
3. With the pump operating at approximately 20% displacement, load the work function and note the
pressure as the POR valve operates (pump displacement reduces to zero).
4. Adjust the pressure override setting by loosening the lock nut with a 9/16 inch hex wrench and
turning the adjustment screw with a 3/16 inch internal hex wrench. Set the POR setting to at least 50
bar [750 psi] below the high pressure relief valve setting of the multi-function valves.
5. Torque the lock nut to 43 N•m [32 lbf•ft].
6. Shut down the prime mover and remove the gauges and install the gauge port plugs.
Pressure override valve for 180 frame size
Pressure override valve
520L0818 • Rev 0101 • August 2015
P104 144E
Torque
41 N•m [30 lbf•ft]
100 N•m [75 lbf•ft]
Operation
Adjusting screw
Lock nut
P104 145E
section.