Hitachi Zaxis 850LC-3 Operator's Manual page 167

Warming-up the Motor and the Cylinders
IMPORTANT: • In cold weather, be sure to thoroughly
warm-up the motors and cylinders.
• If the hydraulic circuit is continuously re-
lieved for a certain amount of time, the
temperature in the control valve would
rise excessively. Never operate to stroke
end more than 15 seconds. After relieving
any function, up to 15 seconds, be sure to
have a 5–10 second intermission.
1. Check that the needle of coolant temperature gauge (2)
starts moving so that engine coolant warm-up operation
is complete.
2. Turn engine control dial (1) to the medium position.
3. Operate the boom, arm and bucket cylinders slowly to
each stroke end several times.
4. Operate travel and swing functions slowly, initially mov-
ing only short distances.
5. Continue to repeat steps 3 and 4 until bucket cycle time
is normal.
OPERATING THE MACHINE
5-5
2
1
M1U1-01-033
M1J1-05-001