30 CFR § 75.1914
Maintenance of diesel-powered equipment.
(a) Diesel-powered equipment shall be maintained in approved and
safe condition or removed from service.
(b) Maintenance and repairs of approved features and those features
required by Secs. 75.1909
on diesel-powered equipment shall
be made only by a person qualified under § 75.1915
(c) The water scrubber system on diesel-powered equipment shall be
drained and flushed, by a person who is trained to perform this task,
at least once on each shift in which the equipment is operated.
(d) The intake air filter on diesel-powered equipment shall be
replaced or serviced, by a person who is trained to perform this task,
when the intake air pressure drop device so indicates or when the
engine manufacturer's maximum allowable air pressure drop level is
(e) Mobile diesel-powered equipment that is to be used during a
shift shall be visually examined by the equipment operator before being
placed in operation. Equipment defects affecting safety shall be
reported promptly to the mine operator.
(f) All diesel-powered equipment shall be examined and tested
weekly by a person qualified under § 75.1915
(1) Examinations and tests shall be conducted in accordance with
approved checklists and manufacturers' maintenance manuals.
(2) Persons performing weekly examinations and tests of diesel-
powered equipment under this paragraph shall make a record when the
equipment is not in approved or safe condition. The record shall
include the equipment that is not in approved or safe condition, the defect found,
and the corrective action taken.
(g) Undiluted exhaust emissions of diesel engines in diesel-powered
equipment approved under part 36 and heavy-duty nonpermissible diesel-
powered equipment as defined in § 75.1908
(a) in use in underground coal mines shall be tested and evaluated weekly by a person who is
trained to perform this task. The mine operator shall develop and
implement written standard operating procedures for such testing and
evaluation that specify the following:
(1) The method of achieving a repeatable loaded engine operating
condition for each type of equipment;
(2) Sampling and analytical methods (including calibration of
instrumentation) that are capable of accurately detecting carbon
monoxide in the expected concentrations;
(3) The method of evaluation and interpretation of the results;
(4) The concentration or changes in concentration of carbon
monoxide that will indicate a change in engine performance. Carbon
monoxide concentration shall not exceed 2500 parts per million; and
(5) The maintenance of records necessary to track engine
(h) Recordkeeping. Records required by paragraphs (f)(2) and (g)(5)
(1) Recorded in a secure book that is not susceptible to
alteration, or recorded electronically in a computer system that is
secure and not susceptible to alteration; and
(2) Retained at a surface location at the mine for at least 1 year
and made available for inspection by an authorized representative of
the Secretary and by miners' representatives.
(i) Diesel-powered equipment must be maintained in accordance with
this part as of November 25, 1997.