jcb JS300 Service Manual page 952

Option ARV (Monoboom)
1 Prepare the Machine.
a Operate the dipper out and lower the boom to set
the bucket on the ground.
Fig 20.
b Make the machine safe, refer to Section E,
Service Procedures.
c Fit two caps B to the option pipes on the dipper.
B
Fig 21.
d Connect a 0 - 400 bar (0-6000 lbf/in
gauge to TP1.
2 Increase MRV Pressure, refer to Section E, Service
Procedures.
3 Start the engine, lower the gate lock lever and run the
engine at minimum no-load speed in the E mode.
E-291
4
Note: For accurate setting, the pressure should be
adjusted up to the required level. Release lock nut X.
Adjust setting screw Y to indicate a pressure below the
required level and then bring the pressure back up for final
setting. Tighten lock nut X.
5
C030150-1
JS06720-C1
JS06720-C1
2
) pressure
9813/5100-1
Section E - Hydraulics
Hydraulic System Test Procedures
Operate the option by pressing the foot pedal. Check
the pressure on the gauge, adjust the ARV.
Restore Original MRV Pressure, refer to Section E,
Service Procedures.
Fig 22.
Auxiliary Relief Valves
312460-C1
E-291