OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Service Procedures
Servo Relief Pressure
E-223 E-223
9803/9880-3
Servo Relief Pressure
1 Prepare the Machine
a Operate the dipper out and lower the boom to set
the bucket on the ground.
C030150-1
Fig 5.
b Make the machine safe, refer to Section E,
Service Procedures.
2 Before testing the Pilot Relief valve C
K Fig 6. ( T E-223), connect a 0-100 bar (0-1500 lb/
in
2
) pressure gauge to test point TP3.
Fig 6.
Note: For accurate setting, the pressure should be
adjusted up to the required level.
3 Start the engine and confirm that the engine is at its
minimum no-load speed and it is in the E mode. The
pressure gauge reading should be compared to the
technical data at the start of this section. If it is outside
the limits adjust the pilot relief valve as below.
4 Loosen the lock nut B of the pilot Relief Valve.
5 The valve is adjusted by turning relief valve adjusting
screw A (one turn of the adjustment screw equals
39.2 bar, (568.5 lb in
2
).
6 Tighten lock nut B to 17 Nm (12. Ibf ft), check the relief
pressure again.
B
C
A