Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V operator should be advised of the requirement. If the operator removes such unsafe equipment or machinery from service immediately it should be noted on the citation. If the operator does not remove such equipment or machinery from service immediately, another citation for such failure should be issued giving the operator reasonable time to comply. This Section in no way affects enforcement of other mandatory safety standards and should be used only where such condition is not covered by any other regulation. Lack of frame grounding, improper protection, etc., are to be cited under the appropriate sections in accordance with Section 104 of the Act allowing reasonable time for compliance. Loading machines and continuous-mining machines shipped from the manufacturer after January 1, 1981, are required to be equipped with load-locking valves in the boom and head lift cylinders. Where it is determined that a unit of equipment was shipped after January 1, 1981, and the load-locking valves are not maintained, enforcement action should be taken under Section 75.503, for failure to maintain the electric face equipment in permissible condition. Load-locking valves provided on equipment shipped from the manufacturer prior to January 1, 1981, also have to be maintained. Appropriate enforcement action under this Section should be taken if these load-locking valves are not being maintained. The tramming of solid-state controlled battery powered equipment in the high-tram mode immediately upon energization of the tram motors indicates that an electrical fault is present on the equipment. When this occurs, the equipment is not in safe operating condition and must be removed from service and properly repaired. Faulty equipment responds in two ways. First, the tram motors may start in high tram and then immediately stop, which causes the machine to "lurch" a short distance. This response indicates that the protective circuits in the solid-state logic unit are sensing a fault and are functioning properly. Second, the tram motors immediately start in high-tram and continue to run in this mode. This response indicates that an electrical fault is present on the machine and that the protective circuits in the solid-state logic unit are inoperative. Proper functioning of temperature-sensitive switches or other devices which shut down air compressor motors when overheating occurs is essential to the safe operation of this equipment. Examinations and testing performed on air compressors must include attention to overtemperature devices, and whenever these safety features are not functioning properly the equipment must be immediately removed from February 2003 (Release V-33) 158
MSHA PROGRAM POLICY MANUAL VOLUME V service. Management shall have the responsibility of designating only properly trained personnel to operate equipment and machinery. The trailing cable shall be disconnected from the source of power before repairs are made on portable or mobile equipment, except when the equipment must be operated for making adjustments. Raised, elevated, and unsecured equipment must be securely blocked to prevent movement before miners position themselves under or between movable components of the equipment. Occasionally more than one component location on a machine must be blocked. Blocking material must be capable of supporting the weight of the equipment or component. Wood used for blocking material must be solid and should be flat sided. Most equipment can be safely blocked with a wooden crib. The crib should be installed on a solid footing and wedged tightly to the machine to prevent any initial movement that could dislodge the blocking. Machinery shall not be lubricated manually while in motion or while energized unless facilities are provided to assure against equipment accidentally starting while being lubricated. Section 75.509 prohibits equipment from being lubricated while energized. This would prohibit the use of machine-powered, hand-operated lubricators on the same machine that is being lubricated. When it is necessary to position certain mechanical parts of equipment for repairs, maintenance, or lubrication, or when hydraulic fluid must be power-pumped, the machine may be energized for that portion of work. However, when hydraulic fluid is powerpumped, no other repair, maintenance, or lubrication work shall be done. Repair, maintenance, or lubrication work shall not be done until the power is removed from the machine. This would prohibit the use of machine-powered, hand-operated lubricators on the same machine that is being lubricated, unless all incoming power connectors are broken by a circuit breaker. A small circuit breaker, connected to the lineside of the power circuit breaker, could supply power to a machine-mounted lubricating system if the power circuit breakers are opened before the machine is lubricated. Opening a circuit breaker which is installed on the machine, and which opens all power conductors entering the machine, shall be acceptable as compliance with this Section for lubrication or changing bits. Opening a double-pole control switch which will open both the negative and positive control circuits, shall be acceptable on direct-current-powered cutting machines and continuous miners for the purpose of deenergizing the machine for changing cutting bits. February 2003 (Release V-33) 159
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Program Policy Manual - VOLUME V - Mine Safety and Health ...

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