TM 5-5420-228-24
INTRODUCTION - Continued
Servicing. Draining and refilling units with oil and changing or cleaning oil filters, fuel filters,
and air cleaners.
Tightening. Tightening nuts, bolts, screws, and other types of fasteners with a torque wrench
to the value listed in the maintenance manual. Do not overtighten; this may strip threads and
break off the part being tightened.
Repairing. Repairing includes inspection, cleaning, preserving, adjusting, replacing, welding,
strengthening, and other tasks associated with putting parts in working condition.
(3) General Cleaning Instructions.
If a steam cleaner is available, it may be used to remove any remaining dirt. After water or
steam cleaning, lubricate launcher. Check all lubricant reservoirs for water droplets. If water is
found, drain and refill. Clean grease, oil, or dirt from all metal parts with dry cleaning
solvent, cleaning compound, or equivalent.
Use mild soap and water to clean or wash parts not made of metal. Rinse thoroughly after
cleaning with water and then dry.
Remove rust or dirt from fine-machined surfaces with dry cleaning solvent and crocus cloth, if
necessary. Do not use any other material. Be careful not to change the dimensions of parts
when rubbing off rust. Coat bare metal surfaces, after cleaning, with lubricating oil.
Nameplates, caution plates, and instruction plates may rust quickly. When they are rusty,
clean parts and coat them with lubricating oil.
(4) General Maintenance Instructions.
Put protective caps or plugs on all tubes, hoses, and fittings as soon as you disconnect them.
Dirt could get in and ruin the system. Do not remove caps or plugs until you are ready to
connect the system.
Replace bent, broken, or stripped bolts, nuts, screws, and washers. Bolts, screws, and nuts may
be loose if rust, chipped paint, or bare metal is around them. Tighten loose screws, bolts, and
nuts. Replace missing parts.
Inspect electric wires for broken, chafed, cracked, discolored, frayed, loose, melted, or worn
insulation. Replace or repair bad parts.
Have another soldier help aline mating ends of connectors, plugs, and receptacles on larger
harnesses. Make sure that pins and keyways line up. Tighten twist-snap type connectors, plugs,
or receptacles until a click is heard. Tighten screws type connectors until a ratchet noise is
heard to indicate that connectors, plugs, or receptacles are tight.
Hold fitting adapter with one wrench and tighten nut with another wrench. When tightening
fittings, tighten nut snug and then tighten 1/6-turn to 1/8-turn more. If fitting leaks, loosen
nut a full turn and then tighten. If still leaking, replace defective parts.
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Change 2
