Komatsu PC450-8 Operation & Maintenance Manual page 435

HIGH REACH DEMOLITION EQUIPMENT 27M
q Operation to open or close crusher
RAISING WORK EQUIPMENT
Operate the work equipment slowly. In particular, operate the
work equipment as slowly as possible during lowering operations.
Operate as follows.
1. Extend boom cylinder.
2. Extend intermediate link cylinder.
RH Lever
Open
Close
Boom cylinder
OPERATION
7
Intermediate
link cylinder
7-25