Hitachi Zaxis 17U-5A Operator's Manual page 130

ZX17U-5A
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WARNING: Do not pull the boom spool rapidly.
Otherwise, the boom may lower rapidly and hydraulic
oil may spout out from the control valve. Be sure to
pull the boom spool slowly.
1. Remove allen head bolts and boom spool to lower the
boom. Place a container to receive oil escaping from the
control valve when removing the boom spool.
2. Ensure the boom is completely lowered, and then install
the boom spool with allen head bolts.
Tightening Torque: 6 to 7 N·m
OPERATING THE MACHINE
(0.6 to 0.7 kgf·m, 4.4 to 5.2 lbf·ft)
5-22
MABA-05-012
Boom Spool
Spool Body
MABA-05-013
Allen Head Bolt