Multi-Function Valve with Bypass Function Engaged
Bypass
actuator
Opening bypass valve
allows flow to circuit
through multi-function valves
P104 144E
Bypass actuator torque
Frame size
Torque
newer 030 – 100
41 N•m [30 lbf•ft]
130 – 250
100 N•m [75 lbf•ft]
Pressure override (POR) valve pressure adjustment (option for 180 frame size)
Pressure override valve operation is explained in the
Operation
section.
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
Lock nut
Adjusting screw
P104 145E
Service Manual
Series 90 Pumps
Adjustments
32
520L0818 • Rev 0101 • August 2015
