Warming Up Operation - Hitachi ZAXIS 30U-5N Operator's Manual

Warming Up Operation

In cold weather, warm up the machine until coolant and
hydraulic oil temperature increases to the appropriate
operating temperature.
IMPORTANT: The appropriate hydraulic oil operating
temperature on this machine is 50 to 80 °C. Hydraulic
components may be seriously damaged if the machine
is operated with low temperature hydraulic oil. In case
warming up the machine by relieving the hydraulic
system, continuously relieve the relief valve for 10 to
15 seconds while taking a pause for 5 to 10 seconds.
1. Turn engine control dial (1) to the slow idle position.
(Do not operate the machine until the first segment
of coolant temperature gauge (2) stops flashing and
changes to stay ON.)
2. After the first segment of coolant temperature gauge
(2) stops flashing and changes to stay ON, turn engine
control dial (1) to around medium position.
3. Operate the boom, arm and bucket cylinders slowly to
each stroke end several times. If the machine equipped
with various attachments, operate the attachment
function slowly to allow hydraulic oil to circulate through
the system.
4. Operate the travel and swing functions slowly to allow
hydraulic oil to circulate through the systems.
5. Warming up operation ends after the above operation is
completed.
f
NOTE: During cold weather season, the warm-up operation
system automatically operates so that the engine speed
increases for a moment even though the engine control dial
(1) is in the slow idle position.
OPERATING THE MACHINE
5-7
Slow Idle
2
Fast Idle
1
MADB-01-067
MADH-01-009