Servo Relief Pressure - jcb JS300 Service Manual

1 Prepare the Machine
a Operate the dipper out and lower the boom to set
the bucket on the ground.
Fig 5.
b Make the machine safe, refer to Section E,
Service Procedures.
2 Before testing the
K Fig 6. ( T
E-285), connect a 0-100 bar (0-1500 lb/
in 2 ) pressure gauge to test point TP3.
C
Fig 6.
Note: For accurate setting, the pressure should be
adjusted up to the required level.
E-285

Servo Relief Pressure

C030150-1
Pilot Relief valve C
TP3
B
A
A405800-C3
9813/5100-1
Section E - Hydraulics
Hydraulic System Test Procedures
TE-013
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
6 Tighten lock nut B to 17 Nm (12. Ibf ft), check the
relief pressure again.
Servo Relief Pressure
2
).
E-285