Retrieval; Excavator Arm (Emergency Operation) - jcb JS300 Service Manual

7. Disconnect the booster cables:
7.1. Disconnect the negative booster cable from the machine frame earth. Then disconnect if from the
booster supply.
7.2. Disconnect the positive booster cable from the positive (+) terminal on the battery. Then disconnect
it from the booster supply.

Retrieval

NOTICE It is not recommended to tow a disabled machine. Permanent damage to the track motors of the
disabled machine may occur if the machine is towed.
If the machine cannot be moved to a safe area, then attach wire ropes or chains which are capable of pulling
the machine to the lower frame, as shown. Refer to Figure 172.
Notice: Do not use the tow eye or tie down points (if installed) to tow the machine, as this will cause damage
to the machine.
A Tow eye
B Tie down points
Use the minimum force necessary to slowly move the machine (not greater than 2km/h (1.2mph)) smoothly
and without shocks).
Tow the machine the minimum distance (not to exceed 20m) to a safe area for recovery by lifting.
Operation > Lifting the Machine > General (Page 135).
Do not use the tow eye or tie down points to tow the machine, as this will potentially cause damage.
When the machine is recovered, a qualified person must inspect the track motors for damage.

Excavator Arm (Emergency Operation)

The excavator has an accumulator installed. The accumulator stores a limited amount of hydraulic pressure
for use in an emergency (engine failure for example). This hydraulic pressure must be used to move the dipper
and lower the boom into a safe position.
Do not try to operate other machine functions as this will deplete the hydraulic pressure in the accumulator and
it may then not be possible to move the dipper and lower the boom.
133
Figure 172.
A
B
B
9831/1100-2
Moving a Disabled Machine
A
B
B
Operation
Refer to:
133