Hitachi Zaxis 850LC-3 Operator's Manual page 360

Breaker hour meter (1) is located in the operator's cab on the
right control panel. This hour meter (1) operates when the
breaker pedal is depressed. Obtain the average breaker opera-
tion ratio according to the following formula.
Average breaker operation ratio (%) = Breaker operation
hours/Excavator operation hours = (Present breaker hour me-
ter reading – Breaker hour meter reading when the breaker
was previously removed)/(Present hour meter reading – hour
meter reading when the breaker was previously removed)
In case the machine is fully engaged in breaker operation
(breaker operation ratio:100%), perform the maintenance of
hydraulic oil, the full flow filter element, and the breaker return
filter based on the reading of the breaker hour meter.
Average breaker op-
eration ratio (%)
OPTIONAL ATTACHMENTS AND DEVICES
Excavator operation hours
=
Breaker operation hours
(Present breaker hour meter reading – breaker hour meter
reading when the breaker was previously removed)
=
(Present breaker hour meter reading – breaker hour meter
reading when the breaker was previously removed)
13-10
1
Breaker Hour Meter
1
M1J1-03-001
M1J1-13-008