Komatsu PC220LC -8 Operation & Maintenance Manual page 210

OPERATION
MACHINE OPERATIONS AND CONTROLS
If the work equipment control levers are returned to the neutral position when the machine is stopped, even if the
fuel control dial is set to FULL, the auto-deceleration mechanism will act to reduce the engine speed to a mid-range
speed.
REMARK
The control circuit on this machine is equipped with an accumulator. Even if the engine is stopped, if the starting
switch key is turned to the ON position within 15 seconds after stopping the engine, and the lock lever is set to the
FREE position, it is possible to use the lever operation to lower the work equipment to the ground.
This procedure can also be used for releasing the remaining pressure in the hydraulic cylinder circuits or for lowering
the boom after loading the machine onto a trailer.
3 - 155