Travel Motor 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 25.
b Make the machine safe, refer to Section E,
Service Procedures.
c Connect a 0 - 400 bar (0 - 6000 lb/in
gauge to test point TP1 or TP2.
2 Increase MRV Pressure, refer to Section E, Service
Procedures.
3 Insert a lock pin P between the drive sprocket to be
measured and the side frame.
∅35
P
300
Fig 26.
Fig 27.
E-294

Travel Motor Relief Pressure

TE-016
C030150-1
2 ) pressure
∅80
150
TOOL-C1
C002730-C1
9813/5100-1
Section E - Hydraulics
Hydraulic System Test Procedures
Travel Motor Relief Pressure
4 Start the engine, select MID speed travel, lower the
gate lock lever and run the engine at minimum no-
load speed in the E mode.
5 Slowly engage the locked travel motor and measure
the pressure in forward and reverse.
6 The pressure gauge reading (travel motor) should be
compared to the technical data at the start of the
section. If it is outside the limits, adjust relief valve
pressure.
Note: For accurate setting, the pressure should be
adjusted up to the required level. Release lock nut A.
Adjust setting screw B to indicate a pressure below the
required level and then bring the pressure back up for final
setting. Tighten lock nut A.
B
A
A
B
Fig 28.
7 Restore Original MRV Pressure, refer to Section E,
Service Procedures.
716370-C8
E-294