Komatsu PC220LC -8 Operation & Maintenance Manual page 191

MACHINE OPERATIONS AND CONTROLS
Breaking-in the New Machine
NOTICE
Your Komatsu machine has been thoroughly adjusted and tested before shipment from the factory. However, operating the
machine under full load before breaking the machine in can adversely affect the performance and shorten the machine life.
Be sure to break in the machine for the initial 100 hours (as indicated on the service meter).
Make sure that you fully understand the content of this manual, and pay careful attention to the following points when
breaking in the machine.
Run the engine at idle for 15 seconds after starting it. During this time, do not operate the control levers or fuel
control dial.
Idle the engine for 5 minutes after starting it up.
Avoid operation with heavy loads or at high speeds.
Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden stops, and
sudden changes in direction.
Engine Warm Up
NOTICE
Do not accelerate the engine suddenly until the warm-up operation has
been completed.
Do not run the engine at low idling or high idling under no load for more
than 20 minutes. This will have an adverse effect on the environment,
and will also have an adverse effect on the internal structure of the
engine. If it is necessary to run the engine at idling for more than 20
minutes, apply a load from time to time or run at a mid-range speed.
After the engine starts, do not start operating the machine immediately. First, carry out the following operations and
checks.
1. This machine is equipped with an automatic engine warm-up system, so if the engine water temperature is
below 30 °C after the engine is started, the engine warm-up operation starts automatically. When the engine
automatic warm-up operation starts, the engine speed is maintained at a speed higher than the normal low idling
speed.
If the engine water temperature goes above 30 °C or if the warm-up operation has been continued for more than
10 minutes, the automatic warm-up operation is cancelled and the engine speed drops to the normal low idling
speed.
2. Check that engine coolant temperature monitor (1) displays
the correct temperature.
If it displays low temperature, use the procedure in Step 3 to
carry out additional warm up of the engine until the monitor
displays the correct temperature.
(A) Display when temperature is correct: Monitor background
(B) Display when temperature is low: Monitor background (C)
3 - 136
(C) is blue
is white
OPERATION