Hitachi ZW 120-6 Operator's Manual page 271

Interval
Check Points
(hours)
Contact surfaces of
flange joints
Bolts
Daily Check
Welded surfaces on
flange joints
Flange joint neck
Welded surfaces on
Every 250
flange joints
hours
Clamps
MAINTENANCE
Abnormalities
Leak (11) Replace
Loose or leak (11) Retighten or replace
O-ring
Leak (12) Replace
Crack (13) Replace
Crack (12) Replace
Missing or deformation Replace or retighten
Loose bolts
7-53
Remedies
13
13
12
11
M4GB-07-059
12
M4GB-07-060
Fig.2