jcb JS300 Service Manual page 181

4. Put the isolator bar down. Do not operate the machine services. Let the engine idle for
Duration: 10s
5. Stop the engine with the engine shutdown button.
6. Operate the two hand controllers to release the pressure in the hydraulic system.
7. Apply the servo isolator.
8. Turn the ignition key to the off position.
9. Set the change-over valve to the grab position.
Grab to Bucket Mode
In grab mode the bucket ram will fully retract and hold this position during operation.
To select bucket mode the attachment must be stopped in a position so that no load is applied to the rod side
of the ram. Any force exerted by the attachment on the ram must be in a direction that pushes the ram in. How
the excavator is positioned to do this will depend on the attachment used.
1. Park the machine as described above.
2. Put the isolator bar down.
3. Stop the engine with the engine shutdown button.
4. Operate the two hand controllers to release the pressure in the hydraulic system. Make sure any force
exerted by the attachment on the ram is in a direction that pushes the ram in.
5. Turn the ignition key to the off position.
6. Set the change-over valve to the bucket position.
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Operation
Operating Levers/Pedals
106