Hitachi ZW 310-6 Operator's Manual page 219

Warm Up
d
CAUTION: Operating the machine without warm
up causes damage to the engine and hydraulic
components. Be sure to perform warm up not only
to protect the hydraulic components from being
damaged but also to ensure safe operation.
If the machine is operated with the hydraulic oil temperature
below 20 °C (68 °F), damage to the hydraulic components
may result. After starting the engine, perform warm up as
described below before operating the machine until the
hydraulic temperature is above 20 °C (68 °F).
1. Apply parking brake and set the shift lever to the neutral
position (N). While slightly depressing accelerator pedal,
run the engine at medium speed for about 5 minutes
with no load.
2. Increase the engine revolutions to 1200 min
Raise the bucket above the ground and hold bucket
control lever (1) in the tilt position for 10 seconds. (Do
not operate control levers other than the bucket control
lever at this time.)
IMPORTANT: Excessively repeated operation of bucket
control lever (1) could generate abnormal surge
pressure, damaging in hydraulic parts.
OPERATING THE ENGINE
(RPM's).
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MNEC-03-003