MMD Equipment 400S-6B1 - Manual (Page 22)

4. Operation
4-3
4.3.2 Check Coolant Level
Taking off the Header tank radiator cap
Be sure to stop the machine and allow time to cool. Then loosen
the radiator cap one notch. After the coolant water is sufficiently
cooled and the inner pressure is released, take the cap off.
If this procedure is neglected, the inner pressure can blow off
the cap. Steam jetting out of the radiator could result in causing
scalding. Follow this procedure under all circumstances.
W005
Check the coolant level in the reserve tank. If it is lower than
the limit, open the cap and replenish the coolant. (Level must
be kept above LOW mark.)
If little coolant is left in the reserve tank, replenish the
radiator with cooling water. (See 5.6.12)
Do not continue operation at low coolant level. Air bubble is mixed into radiator, and it causes
damage to the radiator.
A030173
LOW