Doosan DX35Z, Руководство по эксплуатации и обслуживанию

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OP000471
4-51
Inspection, Maintenance and Adjustment
Heavy duty diesel engines require a balanced mixture of
water and antifreeze. Drain and replace the mixture every
year or 2,000 hours of operation, whichever comes first.
This will eliminate buildup of harmful chemicals.
Antifreeze is essential in any climate. It broadens the
operating temperature range by lowering the coolant's
freezing point and by raising its boiling point. Do not use
more than 50% antifreeze in the mixture unless additional
freeze protection is required. Never use more than 68%
antifreeze under any condition.
Measuring the Concentration of Coolant
The coolant and its additives can be checked by using
coolant test strips (No: 60.99901-0038). Use the following
procedure to conduct the test:
1. With a coolant temperature of 10° - 55°C (50° -
131°F), drain 1 liter (1 U.S. quart) it from the radiator
into a clean plastic container.
NOTE:
Do not take the sample from the coolant
recovery tank. Recovery tank coolant
concentration can differ from the concentration
level of coolant in the radiator.
2. Dip test strip, into coolant sample for 3 - 5 seconds.
Remove strip and excessive coolant by giving the strip
one shack.
3. Wait for 45 seconds, for the test strip to change color.
NOTE:
Measuring time should not be more than 75
seconds. If it is over this time limit, the color will
be changed and an inaccurate reading will
result.
4. Compare the color of the test strip with the color table
on the outside of test strip container bottle, and
determine what numeric value corresponds to the color
in the table.
WARNING!
Pressure at air nozzle must not exceed 2.1 kg/cm
2
(30
psi). Always wear goggles when using compressed
air.
Do not pour cold water into radiator when engine is
very hot and water level is below the top of the
tubes. Such action could result in damage to engine
cylinder heads.