Komatsu PC5500-6 Operation & Maintenance Manual page 253

Hydraulic mining shovel
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OPERATION
3.15 STOPPING THE ENGINES
WARNING
With the engines at standstill and main switch (1) in ON posi-
tion, move all controls for working attachment and crawlers
several times through all shift positions to relieve the pres-
sure in the hydraulic system. The necessary oil pressure for
shifting the spools of the main control valves is provided by
a pressure accumulator in the pilot oil circuit.
NOTICE
The pressure accumulator in the pilot oil circuit serves also
for lowering a raised working attachment to the ground with
the engines at standstill. If, for example, the engines stall
with the working attachment in a raised position, lowering of
the working attachment is possible by operating the respec-
tive control lever.
6. Set main switch key (1) to "0" position and remove.
7. Switch off the battery main switches and remove keys.
253

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