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Service Manual
Adjustments
Multi-function valve pressure adjustment
30
Series 90 Pumps
6. Once you achieve the desired charge pressure setting, remove the gauges and plug the ports.
You accomplish adjustment of the pressure limiter setting and the high pressure relief valve (HPRV)
setting simultaneously. The HPRV setting is automatically set approximately 35 bar [500 psi] above the
pressure limiter setting.
Lock the motor output shaft by locking the vehicle's brakes or rigidly fixing the work function so it cannot
rotate or cap the system ports.
W
Warning
Take necessary precautions that the motor shaft remains stationary during the adjustment procedure.
Multi-function valve adjustment
1. Install two 1000 bar (or 10 000 psi) pressure gauges in the high pressure gauge ports (M1 and M2).
Install a 50 bar (or 1000 psi) pressure gauge in the pump charge pressure gauge port (M3).
2. Start the prime mover and operate at normal speed.
3. Loosen locking nut.
4. Insert an internal hex wrench into the pressure adjusting screw.
A plastic dust plug is installed in the adjusting screw.
5. The model code shows the factory preset pressure limiter setting. It is referenced to charge pressure,
so the pressure limiter setting is the difference between the high and low pressure sides of the
system loop. Activate or move the control input so that pressure increases in the high pressure side of
the closed circuit to the pressure limiter pressure setting. The pressure limiter setting is reached when
the pressure stops increasing and remains steady at a given pressure level (as shown on the gauges).
520L0818 • Rev 0101 • August 2015
Charge pressure gauge port M3
G
B
t
h
Lock nut (smaller hex nut)
t
Lock nut torque
System pressure gauge port M2
G
0 - 1000 bar [0 - 10000 psi]
B
9/16-18
23 N•m [17 lbf•ft]
t
System pressure gauge port M1
G
0 - 1000 bar [0 - 10000 psi]
B
9/16-18
23 N•m [17 lbf•ft]
t
0 - 50 bar [0 - 1000 psi]
9/16-18
23 N•m [17 lbf•ft]
I
Adjusting screw
See appropriate table
P106 168E
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