Digging - jcb JS300 Service Manual

3. Attach a handline to the load. Make sure the person holding the handline stands clear of the load and
machine.
4. Test the load by lifting it:
Distance: 25–50mm
5. If the load is to be lifted to a height where it is not possible to prevent the bucket obstructing or deflecting
the lifting chains then the lifting chains must only be guided by the back wall of the bucket and not by any
other parts of the machine.
A Lifting hook
B Shackle
6. Slowly manoeuvre the load across the ground with the excavator controls. Lower the load to the ground
if you feel any instability of the load or the machine.
When you are using the dipper movement to lift, always lift by moving the dipper away from you, as shown, not
towards you. This is because hose burst check valves (if installed) are provided only on the 'dipper-in' side.

Digging

WARNING Do not use pedals which are not locked in position as foot rests.
NOTICE When carrying out deep digging it is advisable to have the super structure swung in line with the
chassis. It is possible that part of the dig end may contact the machine. Take extra care when digging to
avoid damaging the machine.
NOTICE Do not excavate on hard or rocky ground with the boom positioned diagonally across the
undercarriage. The resulting rocking motion could cause damage to the track gearbox sprockets and tracks.
NOTICE Do not use the side of the excavation to stop the bucket when slewing back into position for the
next dig. Similarly, do not use the side of the bucket to push soil into the excavation. Both these practices
will damage the machine.
Decreasing the Machine Wear
Do not use the weight of the machine to dig. The shock load will cause stress to the dig end and the chassis.
Use the machines hydraulic force to dig.
111
Figure 139.
B
A
Figure 140.
9831/1100-2
Operation
Working with the Excavator Arm
111