jcb JS300 Service Manual page 172

Operation
Operating Levers/Pedals
The boom will move within its limits for as long as you hold the joystick forward or backwards. It will stop
automatically when you release the joystick.
To raise the boom, pull the joystick backwards (position 1).
To lower the boom, push the joystick forwards (position 2).
If the engine stops and will not re-start, to lower the attachment the ground:
1. Make sure the ignition is on.
2. Make sure the controls isolation lever is down and the controls isolation switch is off.
Refer to: Operation > Locks > Control Lock (Page 59).
3. Push the joystick forwards (position 2).
The bucket will move within its limits for as long as you hold the joystick to one side. It will stop automatically
when you release the joystick.
To fill the bucket, move the joystick to the left (position 3).
To empty the bucket, move the joystick to the right (position 4).
Press the power boost button to enable improved breakout for 3s.Refer to: Operation > Instruments > General
(Page 64).
When a Quickhitch system is installed (position the bucket on floor), press the Quickhitch button to release the
Quickhitch. Press the button again to engage the Quickhitch.
Press the one touch idle switch to instantly change the engine rpm back and forth between that selected for
working and a low idling speed.
The proportional auxiliary control (low flow) switch is a variable position switch, spring loaded to the central off
position. The switch supplies a bi-directional flow for relevant attachments, for example weed cutter, grab rotate.
Press and hold the switch to the right or left, as applicable, for as long as the attachment is to be used.
Release the switch to turn off the attachment.
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