Working With The Excavator Arm; General; Preparing To Use The Excavator Arm; Lifting With The Excavator Arm - jcb JS300 Service Manual

General

WARNING When using the boom and dipper fully extended, take the following precautions, otherwise the
machine could get damaged or become unstable and become a danger to you and other people.
Make sure you do not exceed the working capacity of the boom at maximum reach. Slew the boom slowly
to prevent any chance of the machine becoming unstable. For the same reason avoid dumping downhill
if possible.
WARNING Care must be taken with machines installed with an extra long dipper as it may affect the stability
of the machine.
Before you start using the excavator, you must convert the machine into a safe and stable working platform.
Refer to: Operation > Working with the Excavator Arm > Preparing to Use the Excavator Arm (Page 110).
To use the excavator efficiently and safely you must know the machine and have the skill to use it. This
manual instructs you on the machine, its controls and its safe operation. It is not a training manual on the art
of excavating. If you are a new operator, get yourself trained in the skills of using the excavator before trying
to work with it. If you don't, you will not do your job well, and you will be a danger to yourself and others.
If you will be working with a labourer, make sure you both understand what each other will be doing. Learn and
use the recognised signalling procedures. Do not rely on shouting - he or she will not hear you.
Make sure the correct bucket for the job is installed.

Preparing to Use the Excavator Arm

When choosing a digging position, avoid digging downhill if possible. When possible, dump the load on the
uphill side of the excavation. Both of these precautions will help to keep the machine stable.
When the machine is in the required position on the worksite, lower the dozer blade to the ground. Ensure you
have complete field of vision before using the excavator arm.

Lifting With the Excavator Arm

WARNING You must turn on the overload warning system before you use the excavator for object handling,
or a stability hazard could occur.
All lifting operations must be done with the overload warning system turned on.
and Loading > Overload Warning System (Page 108).
Use a signalman when lifting with the excavator. Make sure you both understand and use the recognised
signals. Keep all persons clear of the load and machine when the load is on the excavator.
A bucket must be installed when lifting with the excavator to prevent the bucket link from swinging. Make sure
that the load is not more than the SWL (Safe Working Load)for the bucket.
If a hook is installed a shackle may not be required.
If a lug is installed a shackle is required. The lifting shackle must be removed when excavating to prevent the
possibility of damage. Refer to: Technical Data > Static Dimensions (Page 231).
If your machine is not installed with this equipment there will be a label in the operators cab to indicate this and
you must use the machine for earth moving purposes only.
1. Where possible lifting should be carried out with the bucket closed in order to increase visibility, move the
sharp objects away from the lifting chains and prevent any obstruction or deflection of the lifting chains
away from the vertical position.
2. Attach the lifting chains to the shackle or hook. Keep the chain length as short as possible, to prevent
swinging. Always use lifting tackle which is strong enough and in good condition. Check the load weight
before choosing the lifting chains.
110

Working with the Excavator Arm

9831/1100-2
Refer to: Attachments > Buckets (Page 158).
Refer to: Technical Data > Static Dimensions (Page 231).
Operation
Working with the Excavator Arm
Refer to: Operation > Lifting
110