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74/128 Commissioning
Adjustment of the
maximum pressure at the
pressure relief valve
Problems during
commissioning
Bosch Rexroth AG, CytroBox, RE 51057-B/11.19
▶
Observe the fluid level in the oil tank and top up, if necessary.
▶
Monitor the operating temperature development if the machine is fully in
operation for several hours.
▶
Check the hydraulic power unit for external leakage and correct as necessary.
▶
Check the connection points for leakage after several operating hours.
▶
After having switched on the main feed pump (pos. 4.020), determine the
system pressure.
The system pressure can be determined at the following points:
‒ measuring point (pos. 7.070, pos. 7.080 or pos. 7.090)
‒ pressure sensor (pos. 7.050 or pos. 7.060)
The specified positions can be found in the hydraulic circuit diagram,
see Fig. 9 on page 52.
Proceed as follows to set the maximum pressure limitation:
1.
Remove the protective cap at the pressure relief valve (pos. 7.020).
2.
Loosen the lock nut (SW19).
3.
Turn the grub screw with an internal hexagon of 6 mm clockwise further into the
valve.
The maximum pressure will increase.
– Check the pressure at the above-mentioned points.
– Unscrew the grub screw counterclockwise.
The pressure will decrease.
– Set the required maximum pressure in this way.
Tighten the lock nut applying a tightening torque of 10
4.
5.
Put the protective cap back on the pressure relief valve.
When adjusting the pressure relief valve (pos. 7.020), the seat valve (pos. 6.770)
must be in the "Closed" position.
Further information on pressure relief valves according to DBDS can be found
in the operating instructions 25402-B, see chapter 1.2 "Required and amending
documentation".
To support systematic inspection for and reduction of errors, refer to the matrix,
see Table 51 "Impact of defects" in chapter 15 "Troubleshooting".
+5
Nm.
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