MMD Equipment 185S-5C2 part 1 - Manual (Page 10)

1.Safety
1-7
1.3 Caution during Inspection and Maintenance
Remove the starter key from the starter switch before
starting inspection, and hang up a “Now Checking and under
Maintenance” tag where it can be easily seen. The checker
must keep the key during checking and maintenance.
Remove the negative (–) side cable from the battery.
If the above procedure is neglected, and another person
starts operating the machine during check or maintenance, it
could cause serious injury.
When you refill the separator receiver tank with compressor
oil, stop the engine, and make sure that the pressure gauge
indicates 0MPa and there is no residual pressure in it, and
then gradually loosen the oil filler cap for refilling oil.
Note residual pressure in the separator receiver tank could
force both extremely hot compressed air and oil to jet out
and you may be scalded or seriously injured.
After stopping the engine, make sure that pressure gauge
indicates 0MPa. Even when the gauge shows 0MPa, open a
service valve and further do not fail to make sure that there is
no residual pressure in the air piping. Then start such a job
as repair and maintenance.
Residual air under pressure will blow off and severely injure
operator.
After stopping the engine, confirm that the pressure gauge
indicates 0MPa and there is no residual pressure in it, then
open the drain valve gradually to drain the compressor oil.
Note residual pressure in the separator receiver tank could
force both extremely hot compressed air and oil to jet out
and you may be scalded or seriously injured.
Hang a “Now Checking and under Maintenance” tag
SY001
Refilling of compressor oil
Be careful of high-pressurized air blowout
W010
W010
Draining separator receiver tank
H990432