Warming Up Operation; Warming Up In Cold Weather - Hitachi Zaxis 17U-5A Operator's Manual

Warming Up Operation

The normal operating temperature of hydraulic oil is between
50 and 80 °C (122 and 176 °F). Hydraulic components may
be seriously damaged if the machine is operated when the
hydraulic oil temperature is below 20 °C (68 °F).
Before starting work, be sure to follow these warm-up
procedures until the temperature of the hydraulic oil reaches
above 20 °C (68 °F).
Warm-Up Procedures:
1. Turn engine control lever (1) to the slow idle position.
(Do not operate the machine until coolant temperature
indicator (2) goes off.)
2. When coolant temperature indicator (2) goes off, run the
engine for 5 to 10 minutes with the engine speed control
lever at the medium position.
3. Extend and retract each cylinder several times and
lightly operate the swing and travel motors to warm up
them.

Warming Up in Cold Weather

IMPORTANT: In case the hydraulic oil temperature is low,
never operate the machine until all actuator speeds
become normal after warming up operation.
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 lever
is in the slow idle position.
1. Run the engine at intermediate speed for 5 minutes
(longer if the air temperature is extremely low).
2. Do not run the engine at either slow or fast speed during
this time.
3. Extend and retract each cylinder several times and
lightly operate the swing and travel motors to warm up
them.
4. Extend the bucket cylinder to the stroke end. Be sure not
to hold the bucket lever in this position for more than 30
seconds.
5. Retract the bucket cylinder to the other stroke end. Be
sure not to hold the bucket lever in this position for more
than 30 seconds.
6. Repeat steps 4 to 5 until the bucket cylinder cycle time
becomes normal.
OPERATING THE MACHINE
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MABA-01-005
M1NC-01-005