ELECTRICAL GROUND POINTS

TM9-320-270-20-1

ELECTRICAL GROUND POINTS

Many electrical problems are the result of poor ground connections. You can make sure that ground

connections are good by doing the following:

WARNING

Although battery ground cable must be connected to test electrical circuit voltage,

disconnect battery ground cable before doing resistance tests or replacing parts. This

will keep you from getting shocked and prevent damage to parts and equipment.

Remove hardware connecting ground cable terminal lug to ground point.

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 maybe carcinogenic. Boiling

point is 114F (46C). 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 mounting hardware, ground cable terminal lug, and ground point with electrical

parts solvent cleaning compound (item 4, appendix C) and acid swabbing brush.

Remove any rust with wire brush and crocus cloth (item 5, appendix C).

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

Install hardware connecting ground cable terminal lug to ground point. Make sure that all

hardware is tight.

LINES AND PORTS

To keep dirt from contaminating fluid systems when removing and installing hydraulic, fuel, coolant

and oil lines, do the following:

Clean fittings and surrounding area before disconnecting lines.

Cover, cap, plug, or tape lines and ports right after disconnecting lines. Whenever possible,

use protective plastic caps and plugs. When these are not available, use hand-carved wooden

plugs, clean rags (item 10, appendix C), duct tape (item 19, appendix C), or similar materials

to keep dirt out of fluid systems.

Make sure new and used parts are clean before installing them.

Wait to uncover, uncap, unplug, or remove tape from lines and ports until just before installing

lines.

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