prove costly to the Navy. It also requires more extensive repair to system components. As a senior Utilitiesman, you must be able to coordinate maintenance efforts. An understanding of the maintenance required for each component will assist you in carrying out this type of duty.

PRIME MOVER MAINTENANCE

Air compressors can be driven by diesel, gasoline, and electrical prime movers. These power-producing items of equipment require the same maintenance as any prime mover used to drive other equipment encountered by the Utilitiesman.

Establish a definite lubrication schedule. Normal oil levels in engines must be maintained at all times, using lubricants recommended by the manufacturer. The frequency of oil changes depends on the severity of service, atmospheric dust, and dirt. These factors also affect the filter and in the case of electrical motors, the need for regular lubrication of bearings.

Daily operator maintenance prevents most breakdownsm Following the suggested maintenance requirements of the manufacturer helps to reduce downtime caused by prime mover failure.

AIR COMPRESSOR MAINTENANCE

Taking into consideration the many types of air compressors the Utilitiesman may encounter in the field, it is impossible to cover all the maintenance requirements of air compressors in this section. Several common factors do apply to all compressors.

The establishment of a lubrication schedule is at the top of the list for ensuring trouble-free operation of compressors. A definite schedule and assignment of responsibility for maintenance personnel to follow are required. The manufacturer's manual establishes minimum requirements that should be followed.

Bearings, packing, seals, and clearances between moving parts must be within the manufacturer's specifications and be included on the maintenance schedule. Many compressors allow for adjustment while others require overhaul when clearances are exceeded.

Visual inspections for dust, dirt, or leaks provide early detection of possible maintenance requirements. Operator maintenance, when conducted properly, can help you catch and correct potential problems early. Ensure all of your operators know how to operate the equipment. In all cases, you should use the manufacturer's manual when making repairs or adjustments.

AUXILIARY EQUIPMENT MAINTENANCE

All auxiliary equipment that services the air compressor or is serviced by the compressor requires periodic scheduled maintenance. Air filters should be checked and cleaned at least once a month. Silencers should be checked twice a year for corrosion, paint, and gasket damage. Intercoolers and aftercoolers must be inspected for scale buildup in hub leaks and so forth. In general, all auxiliary equipment must be placed on a schedule for inspection and periodic maintenance.

DISTRIBUTION SYSTEM MAINTENANCE

Distribution systems require a minimum of maintenance. Checking valve operation, hose connecters, draining condensation (manual or automatic), protecting piping from damage, and repairing leaks are the most common considerations in a maintenance plan.

Procedures applicable to the preventive maintenance inspections for compressed air plants can be found in NAVFAC MO 209, Steam, Hot Water, and Compressed Air and NAVFAC P-717, Preventive/Recurring Maintenance Handbook. For more involved technical maintenance, such as overhauls, make sure competent personnel are trained before they are needed. Again, follow the manufacturer's manual to repair any air compressor component.