Section VII. RADIO INTERFERENCE SUPPRESSION

Section

VII.

RADIO

INTERFERENCE

SUPPRESSION

r e p l a c e m e n t of secondary suppression components,

4 - 1 0 A . General Methods Used to Attain Proper

refer to the applicable maintenance sections of this

Suppression

manual.

E s s e n t i a l l y , suppression is attained by providing a

4-13.

Testing

Radio

Interference

Sup-

l o w resistance path to ground for stray currents.

pression Components

T h e methods used includes shielding the ignition

and high-frequency wires, grounding the frame

If interference is indicated, isolate the cause of

with bonding straps, and using capacitors and

interference

the

trial-and-error

method

resistors. F o r g e n e r a l i n f o r m a t i o n o n r a d i o i n -

replacing each suppression component in turn,

terference suppression, see TM11-483.

until the cause of interference is located and

eliminated.

4-11.

Interference

Suppression

Components

a. Primary Suppression Component. The in-

t e r f e r e n c e suppression bonding strap is illustrated

on figure 4-1.

Secondary

Suppression

Components.

(1) T o o t h - t y p e l o c k w a s h e r s .

(a) T h e g e n e r a t o r i s m o u n t e d o n t h e t o p

front of the engine and is grounded by internal-

e x t e r n a l toothed lockwashers.

(b) The generator regulator is mounted on

the main frame near the left rear end of the engine

a n d is grounded by internal-external toothed lock-

washers and bonding strap.

(2) C a p a c i t o r . T h e i n t e r f e r e n c e s u p p r e s s i o n

capacitor is located in the generator voltage

regulator.

(3) S h i e l d e d c a b l e s . T h e e n g i n e g e n e r a t o r i s

equipped with a shielded cable connecting the

g e n e r a t o r and the generator regulator.

4-12. Replacement of Suppression Components

Replace radio interference components with new

components that are identical. It is essential that a

good metal-to-metal contact is achieved to maintain

proper radio interference suppression. To correct

faulty suppression, substitute new interference

suppression c o m p o n e n t s u n t i l t h e f a u l t y c o m -

ponents are discovered.

a. Primary Suppression Component. Refer to

f i g u r e 4-1, and replace the bonding strap.

Secondary

Suppression

Components.

For

Section

VIII.

MAINTENANCE

FORKLIFT

for

(2) Inspect all electrical wiring

4 - 1 4 . General Cleaning and Inspection Methods

d e t e r i o r a t i o n of insulation, cuts and bare wires.

a. Cleaning.

(3) Inspect all hoses for cuts, deterioration,

(1) Clean all parts in an approved cleaning

l e a k s and loose fittings.

solvent, e.g., Fed P-D-680.

(4) Inspect all lines for dents, cracks and leaks.

( 2 ) Clean surfaces and install new gaskets as

(5) Inspect all hardware

for

damage,

rust,

required.

breaks and damaged threads.

( 3 ) When using air use dry low pressure air.

drive

belts

for

cuts

and

(6) Inspect

b. Inspection.

deterioration.

( 1 ) Inspect all parts visually before installing

or reinstalling for cracks, wear, rust, corrosion.

4-15.

Engine

Assembly

c u t s , breaks and dents,

This section contains information on the main-

4-6