TM 55-1930-209-14&P-7Section IV. Maintenance procedures4-5 General.Maintenance for this system consists of disassembling, repairing/replacing, and reassembling Itemslisted in the repair parts listed In TM 55-1930-209-14&P-18. When performing maintenance, be sure to observeprecautions listed in manufacturers' manuals/instructions and the followinga.Always use new seals and gaskets, same as original, before reassembling components that have beendisassembled for repair. Carefully install so as not to damage during assembly.b.When replacing gaskets, make sure mating surfaces are clean and free of old gasket material, adhesive, oil, orgrease. These precautions will ensure a leak-proof joint.c.When replacing O-rings, make sure all surfaces are clean and free of dirt, grit or foreign material. Prior toinstallation, apply a thin coat of silicone grease to O-ring for ease of assembly. Protect O-rings by applying tapeover threads, sharp corners and edges of components in which the O-ring will be placed.WARNINGBe sure electrical power is off and air pressure is zero before performingmaintenance on this system Open power panel 1 circuit breaker 3P5. Turncompressor electric controller OFF. Bleed air pressure from receiver by openingreceiver drain cock. Bleed air pressure from lines by turning air station air valvescounterclockwise until they stop. Observe safety precautions listed In front of thisvolume and those specified in manufacturers' manuals/instructions.d.When replacing electrical components, follow proper procedures for soldering or crimping connections. Check allgrounding Make sure current carrying members are properly insulated to avoid short-circuiting Check forabrasions and chafing of Insulation on wires and cables. Repair with tape or replace as necessary.4-5.1 Air pressure regulators 1 and 24-5.1.1 Repair.Upon detection of leaks, pressure fluctuation or pressure creep, or for semiannual maintenance services,perform these procedures:a. Shut down air compressor system by following procedures In paragraph 3-8.2.b.Redtag power panel 1 circuit breaker 3P5 indicating, "WARNING DO NOT ACTIVATE REPAIRS BEING MADE."c.On air pressure regulator, unscrew bottom plug (or pressure gauge If installed in this manner) and remove bottomplug O-ring, bottom spring and disc assembly. Inspect valve seat for damage or wear. See Figure 4-1 forIdentification of parts.d.Inspect valve seat in head casting for foreign material or damage. Clean with soapy water, rinse, and dry withlint-free cloth.e.Replace any damaged parts using repair kit (CAGEC 04049, Part No. 1586R) parts (bottom plug O-ring, bottomspring, and/or disc assembly).f.Assemble pressure regulator in sequence shown in Figure 4-1.g. Start air compressor system by following procedures in paragraph 3-2.1 .h.Check for proper operation If still malfunctioning, shut down air compressor system by following procedures inparagraph 3-8.2 Then perform steps j through s i. If working properly, proceed to step r.j Remove six screws attaching bonnet to head casting and remove bonnet.k.Remove spring button, adjusting spring and relieving diaphragm. Figure 4-1 shows parts identification.I.Inspect diaphragm and diaphragm seat In head casting for tears, wear, or foreign material4-3
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