Hitachi ZAXIS 250LC-7 Operator's Manual page 49

Installing hoses between the boom and arm
1. Release remaining pressure from the piping before
installing hoses.
Refer to the "Operator's Manual for Hitachi Excavator" for
bleeding air.
d
CAUTION: Do not release pressure from the hydraulic
circuit of the boom and arm cylinders. Releasing
pressure is dangerous as the boom and arm may fall
down under its own weight.
2. Installing hoses between the boom and arm.
Be sure to clean the joints before connecting the pipes.
Check if the O-ring to be installed in the joint is free from
any damage and is seated correctly.
Tighten the hose connector with the specified torque.
Refer to the "Operator's Manual for Hitachi Excavator" for
tightening torque.
DISASSEMBLING • ASSEMBLING
4-15