Check Gas Damper; Tightening And Retightening Torque Of Nuts And Bolts - Hitachi ZAXIS 135US-5B Operator's Manual

Check and Clean Injector
--- every 4500 hours
See your authorized dealer.

Check Gas Damper

--- as required
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CAUTION: The gas damper has been charged with
high-pressure nitrogen gas. Inappropriate handling
may cause explosion, possibly resulting in serious
injury or death.
The gas dampers are used in the tool box cover and the cab
overhead window. Contact your nearest authorized dealer
immediately at any of the following situations.
 The cover or window can not be opened with normal
operating force.
 The cover or window can not maintain its open position.
 Oil or gas leak is found.
Tightening and Retightening Torque of Nuts and
Bolts
--- every 250 hours (first time after 50 hours)
Tighten or retighten nuts and bolts used on this machine in
accordance with the torque values shown in the following
table. Bolts and nuts should be replaced with those of the
same or higher grade.
Check tightness after the first 50 hours then every 250 hours.
For tightening bolts and nuts other than specified in the
following table, refer to the Tightening Torque Chart at the end
of this section.
MAINTENANCE
7-108