Doosan DP158L Series, Руководство по эксплуатации и техническому обслуживанию

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4. Regular inspection
45
Measurement of Coolant Concentration
• Special Tools
The coolant concentration can be measured as follows.
1. If the engine coolant temperature is within a range of 10
~ 55°C, drain the coolant and fill half a plastic cup with it.
2. Soak the test sheet in the coolant and take it out after 3 ~
5 seconds. Shake the sheet to remove the remaining
coolant.
3. Wait for about 45 seconds until the test sheet changes its
color.
4. Check the color on test sheet.
EDL0213002A
1) Compare the color of part A on the test sheet to the color
of GLYCOL/FREEZEPOINT (End pad) of the standard
color table.
2) Compare the color of the test sheet (B) to the color of
MOLYBDATE (Middle pad) of the standard color table.
3) Compare the color of the test sheet (C) to the color of
NITRITE of the standard color table.
5. Compare and confirm the parts with identical colors on
the test sheet and the standard color table.
EDL022154A
1) Compare the changed pink color part A of the test sheet
with the GLYOOL/FREEZEPOINT (End pad) of the stan-
dard color table on top of the container and confirm the
concentration. The concentration indication has to be
within the color scope of 33~50%.
2) The state of additives for anticorrosion is shown on the
point where the color of MOLYBDATE (Middle pad) on
the standard color table (which is identical with the Middle
(B) of the test sheet) is crossed with the color of NITRITE
on the standard color table (which is identical with the (C)
of the test sheet). It should be maintained at the optimum
range, in the green section between 0.3 to 0.8.
3) If the measurement result is below 0.3, replenish anticor-
rosion additives (DCA4). If it is above 0.8 or, drain a little
coolant and then add clean tap water to adjust the
concentration.
Discharging the coolant
The coolant can be discharged as follows.
Figure Product Number/Name
60.99901-0038 CC2602M
Coolant test sheet
CAUTION
When taking out a sample of coolant from the supple-
mentary tank, it is difficult to measure the precise
concentration. Always take out sample by opening the
drain plug of coolant.
CAUTION
Measurement time should not exceed 75 seconds. The
color changes as time passes.
C) B) A)
CAUTION
• If the color on the test sheet does not match the
color of the standard color table, find a middle color
on the standard color table. For example, if the color
of (C) of the test sheet matches D and F on the
NITRITE of the standard color table, select E.
• To prevent corrosion inside of the engine cooling
unit, drain the coolant and replace it with new
coolant once a year.
TEST TEST
SERVICE SERVICE
PRE CHARGE PRE CHARGE