Hitachi ZW 310-6 Operator's Manual page 220

Cold Weather Warm Up
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CAUTION: In case the hydraulic oil temperature
is low, perform cold weather warm up. Operate
the machine only after loading linkage speed is
normal. Operating the machine without warming
up first 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.
IMPORTANT:
 Do not subject the engine to sudden acceleration
until the end of the warm-up period.
 Do not idle the engine for excessively long
periods of time to prevent engine performance
decrement.
 Long periods of idling (more than 10 minutes) can
damage an engine because combustion chamber
temperatures drop so low the fuel can not burn
completely. This will cause carbon to form in the
injector spray holes and on the piston rings and
can result in stuck valves.
1. Run the engine at slow idle speed for 5~10 minutes
to warm up.
If the [Warm Up Operation] in the multi-monitor
setting menu is set to "ON" (enabled), the engine
speed automatically increases from slow idle to
1000 min (rpm) and enters warm-up mode when
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hydraulic oil temperature is 0 °C (32 °F) or lower.
Further, when either hydraulic oil temperature
reaches 30 °C (86 °F) or higher, or engine coolant
temperature reaches 40 °C (104 °F) or higher, the
warm-up mode is automatically canceled, and the
engine runs in slow idle mode.
(Do not operate the machine until the needle of
coolant temperature gauge (1) starts moving.)
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NOTE:
 Refer to page 1-64 for Warm Up Operation setting
menu.
 When auto idling-stop setting is ON, the engine
may stop during warm up. To avoid this situation,
deactivate the auto idling-stop or set the auto idling-
stop activating time longer. Refer to page 1-52 for Auto
Idling Stop setting menu.
OPERATING THE ENGINE
3-12
1
MNEC-03-002