Overload Warning System - jcb JS300 Service Manual

All lifting operations must be done using the load charts in the cab. The load charts refer to the lift capacities
relevant to the machine specification when equipped with an approved JCB tipping link, shackle and bucket
ram.
The weights of buckets, slings and auxiliary devices must be deducted from these capacities. Care must be
taken to make sure that these loads are not exceeded.
If a load chart is not installed in the cab, the machine is not designed for lifting.
The load chart is only installed on machines with object handling equipment, it is attached to the right hand
window. The load chart shows how far you can raise and extend a load without exceeding the SWL. Each
machine model has its own specific load chart.
The relevant load chart for your machine has a part number. If the load chart is missing or damaged a new
label must be attached, contact your JCB dealer for advice if you are not sure.
A Holding circuit pressure
B Refer to the operators manuals before you try to lift a load
C Working circuit pressure
D Complete slew of the upper structure
E Lift with the bucket cylinder retracted
F Weight of the counterweight
G Width of the track

Overload Warning System

WARNING When the overload protection system buzzer sounds, you must decrease the machine lift. If
you do not decrease the machine lift a stability hazard could occur. When the machine is in a safe position
the buzzer stops.
When the machine is used for lifting it may become unstable, there is a requirement for an audible and visible
warning system.
The overload warning system senses the pressure in the boom lift pressure circuit, and gives a visual and
audible warning when the pressure exceeds the pre-determined limits and there is a risk that the machine
could become unstable.
When the machine is used for lifting, the system must be turned on. The overload warning system must be
enabled through the DECU (Display Electronic Control Unit).
When the system is active the DECU will show the enabled icon in the lower section of the DECU.
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Figure 137.
C G
B
JSXXXX
XXXMPa
XXXMPa
XXXXkg
C 9
8
B
7
Z1
6
5
4
3
C
B m
2
kg
2 3 4 5 6 7 8 1
Z2
0
Z1 XXXX XXXX XXXX
-1
XXXX XXXX XXXX
Z2 XXXX XXXX
-2
Z3
XXXX XXXX
-3
XXXX XXXX XXXX
Z1 XXXX
-4
Z2 XXXX XXXX XXXX XXXX
XXXX XXXX
Z3
-5
Z3 XXXX XXXX XXXX XXXX XXXX
-6
Z1 XXXX XXXX XXXX XXXX
XXXX XXXX
-7
Z2 XXXX XXXX XXXX XXXX XXXX XXXX XXXX
10 9
Z3 XXXX XXXX XXXX XXXX XXXX
F
A
9831/1100-2
D
8 7 6 5 4 3 2 1
E
Operation
Lifting and Loading
108