SOLDERING - CONTINUED - TM-9-2320-302-20-21004

TM 9-2320-302-20-2

GENERAL MAINTENANCE INSTRUCTIONS - CONTINUED

0299 00

SOLDERING - CONTINUED

Solder connection must be bright and clean before soldering. Remove dirt and grease with detergent. Solder used must

be of lead-tin alloy, rosin core with soldering flux. All wires, parts, and soldering gun must be tinned for good connec-

tion 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 heat sink and absorb excess heat.

Clean all solder joints with a scrub brush and electrical parts with detergent after soldering to get a bright, clean surface.

HEAT SHRINKABLE TUBING

NOTE

Further information on shrink wrap usage and sources of supply can be found in WP 0151 00.

Use heat shrinkable tubing to insulate soldered and crimped electrical connections as follows:

Cut desired length of new heat shrinkable tubing twice the diameter of the connection to be covered.

Slide the heat shrinkable tubing onto the wire and out of the way before making electrical connection.

After making electrical connection, slide heat shrinkable tubing into place over electrical connection.

WARNING

DO NOT touch heat shrinkable tubing for at least 30 seconds after heating. Heat shrinkable tubing is hot and

will burn you.

Hold heat gun 4-5 in (10.2-12.7 cm) away from heat shrinkable tubing and apply heat for approximately 30 sec-

onds. Stop applying heat as soon as heat shrinkable tubing forms to the shape of the electrical connection.

ELECTRICAL GROUND POINTS

Many electrical problems are the result of poor ground connections. You can ensure that ground connections are good

by performing the following steps:

WARNING

Although master battery switch must be on and battery ground cable connected in order to test electrical cir-

cuit voltage, turn off master battery switch or disconnect battery ground cable before performing resistance

tests or replacing parts. This will prevent shock to personnel, and damage to parts and equipment.

Remove hardware connecting ground cable terminal lug to ground point.

Clean mounting hardware, ground cable terminal lugs, and ground point with detergent and scrub brush.

Remove any rust with wire brush and crocus cloth.

Look for cracks, loose terminal lugs, and stripped threads. Replace any defective parts.

Install hardware connecting ground cable terminal lug to ground point. Ensure that all hardware is tight.

0299 00-8