Instruments; General - jcb JS300 Service Manual

General

Machine Power Band Controller
The machine power band controller matches engine speed and hydraulic pump output dependant on the
machine power selected by the operator. Machine power can be varied from Light (L), General (G), Heavy (H)
and Heavy Plus (H+) using the rotary control. The machine power selected is displayed on the DECU (Display
Electronic Control Unit) with bars.
Small, slow rotation of the rotary control offers precise control of machine power. Large, fast rotation of the
rotary control gives a large jump up or down the power band.
Display Bars
0
1
2
3
4
5
6
7
8
At idle and low power there will be no bars on the DECU.
Powers L1,L2 and L3 are for precision and lifting operations. These powers give you low hydraulic pump flow but
permanent high pressure (two stage relief activated). This allows a precise control of the services for accuracy.
The auto idle function is not active, only one touch idle can be used. Overload caution is on
Powers G1,G2 and G3 are for general operations. These powers have increased engine speed, increased
hydraulic pump flow without permanent power boost. These powers are for general digging and loading work
with good fuel efficiency. Power boost is selectable. The DECU will not give any indication if you use the power
boost button. Each power boost will give you 3s of higher hydraulic power for extra tearout. Once the 3s has
elapsed the system will automatically deactivate for 9s. The DECU will not give any indication of this occurring.
Power H is for heavy duty operations. Fuel economy is reduced. High speed operation of all hydraulic functions/
services is enabled. Selectable power boost is also available as per general mode.
H+ is for very heavy digging or increased work output. To select H+ first select power H using the rotary control.
Then press the H+ button on the power band controller to select H+ power.
If the machine power does not change even after turning the control it is because the auto idle button or one
touch idle is selected. Refer to Figure 55.
Controls (Page 96).
When the engine is started in ambient temperatures between -19°C (-2.2°F) and 2°C (35.6°F) the machine will
default to engine idle for between 2s and 30s
Press the automatic idle button to activate the automatic engine idle system. The engine speed will drop to idle
when the machine has been idle for 5 seconds. The time delay can be adjusted by the DECU.
64

Instruments

Refer to: Operation > Instruments > Instrument Panel (Page 65).
Figure 54.
L G
Table 5.
Machine Power
Idle
L1
L2
L3
G1
G2
G3
H
H+
Refer to: Operation > Operating Levers/Pedals > Excavator Arm
9831/1100-2
H H+
Operation
Instruments
64