TAGGING PARTS

TM 5-2420-222-20-1

TAGGING PARTS

Use cardboard tags with wire fasteners (item 30, Appendix C) to identify all electrical wires; hydraulic, fuel, oil, and coolant

lines; and any other parts which may be hard to identify or place later. Fasten tags to parts during removal by wrapping

wire fasteners around or through parts and twisting ends together. Position tags to be out of the way during cleaning,

inspection, and repair. Mark tags with a pencil, pen, or felt-tip marker.

Identify electrical wires with number of terminal or wire to which it connects whenever possible, to avoid confusion. If no

markings can be found, tag both wires or wire and terminal, and use the same identifying mark for both. If you cannot tag a

wire because it must fit through a small hole or you cannot reach it, write down a description of the wire and the point to

which it connects, and draw a simple diagram on paper. Be sure to write down enough information so you will be able to

connect wires properly during assembly.

If you need to identify a loose wire, look for color of the wire. Compare this color to the wire colors on the appropriate

electrical schematic in Section XII, Electrical System (page 2-435).

Identify hydraulic, fuel, coolant, and oil lines whenever you are taking off more than one line at the same time. Mark tags

with the points to which lines and hoses must be connected. For example, "Bulkhead adapter to scarifier cylinder tube and

adapters might be written on the tag for a hydraulic hose. If it is not obvious which end of a line goes where, tag each end

of the line.

Identify other parts as necessary by name and installed location.

SOLDERING

CAUTION

Use a low-wattage soldering gun when soldering electrical wires, connectors, terminal lugs, and

receptacles. A high-wattage soldering gun may damage parts by overheating them.

Solder connections must be bright and clean before soldering (see page 2-138 of this section for instructions on how to

clean electrical parts). Solder must be non-acid type (item 26, Appendix C). Use rosin flux (item 12, Appendix C). All wires,

parts, and soldering gun must be pre-tinned for good connection and maximum transfer of heat.

To prevent overheating damage to electrical parts when soldering and unsoldering connections, hold bare wire, lead, or

terminal lug close to soldering point with long roundnose pliers. Pliers act as a heat sink, absorbing excess heat.

WARNING

Electrical parts solvent cleaning compound (trichlorotrifluoroethane) is flammable, and reacts violently with

aluminum, titanium, barium, lithium, samarium, and sodium potassium. Cleaning compound fumes

displace air and it may be carcinogenic. Boiling point is 114F (460C). Do not wear jewelry. Wear rubber

gloves and use only in well ventilated area. Avoid contact with skin, eyes, and clothes and do not breathe

vapors. Do not use near open flame or excessive heat. If you become dizzy while using cleaning

compound, get fresh air immediately and get medical aid. If contact with eyes is made, wash your eyes

with water and get medical aid immediately.

Clean all solder joints with an acid swabbing brush and electrical parts solvent cleaning compound (item 4, Appendix C)

after soldering to get a bright clean surface.

2-140