jcb JS300 Service Manual page 178

3
A
C
B
2
1
4
1 Left: Slew to the left
2 Right: Slew to the right
3 Forward: Lower the boom
4 Backward: Raise the boom
A Auxiliary hold (proportional control only)
B Boom priority (if fitted)
C
Horn
D
Proportional auxiliary control high flow (option)
Triple Articulating Boom (Option)
On a machine with a triple articulating boom, the boom is in two parts, as shown.
Operate the pedal in the cab to extend or retract the ram. This operation in combination with the joystick
controls, gives a wide range of boom/dipper positions for more versatility when excavating.
To extend the ram, push on the heel end of the pedal.
To retract the ram, push on the toe end of the pedal.
The ram will stay in the last selected position.
On machines with a 'Supershort' dipper or a 'Triple Articulated Boom', the bucket can foul the boom when the
dipper is swung inwards. Be careful when you swing the dipper is inwards.
103
Figure 133.
3
A
D
2
1
C
B
4
9831/1100-2
3
2
Operation
Operating Levers/Pedals
4
1
103