Hitachi EX 3600-6, Operator'S Manual

Page: 229 / 306

MAINTENANCE
7-90
•
How to Use Test Kit
IMPORTANT: Measure time precisely to obtain the
correct test results. Use a stop watch or
watch with a second hand. If the reagent
color change is checked too early or too
late, correct measurement results won’t
be obtained. If coolant is maintained
based on incorrect check data, damage
to the engine may result.
1. Use coolant collected from the radiator or the engine
drain cock for checking. Don’t collect coolant from the
reservoir. Wait to cool the collected coolant tempera-
ture to 10 to 54
°
C before checking.
2. As soon as one test paper is taken out of the plastic
container, close the cover correctly. Do not touch the
area coated with the reagent. If the area has already
changed to light brown use another test paper.
3. Dip the test paper into the collected coolant for one
second. After taking up the test paper, desiccate the
extra coolant.
4. Wait 45 seconds. Then, compare the changed re-
agent color on the test paper with the color specimen
and determine the coolant concentration by following
procedures.
(1) Take a record of the anti freeze concentration by
comparing the color on reagent section (1) with
the anti freeze color specimen printed on the test
paper plastic box (
III
).
(2) Take a record of concentration by comparing the
color on reagent section (2) with the SODIUM
MOLYBDATE color specimen printed on the test
paper plastic box (
III ).
(3) Take a record of concentration by comparing the
color on reagent section (3) with the SODIUM NI-
TRITE color specimen printed on the test paper
plastic box (
III ).
5. Complete all color comparison check within 75 sec-
onds after dipping the test paper into the coolant.