Testing of Radio Interference Suppression Components

Screw, machine, 10-32 x 1/4 in.

Screw, machine, 8-32 x 1/4 in. (2 rqr)

Screw, cap, 3/8-16 x 1 in.

Washer, lock, ET, 1/4 in.

Capacitor, 25 mfd-100 vdc-20 amp

Washer, lock, ET, 3/8 in.

Screw, machine, 10 32 x 1/4 in.

B-Beacon warning light capacitor

Ground strap (2 rqr)

Washer, lock, ET, 1/4 in.

Screw, machine, 8-32 x 1/4 in. (2 rqr)

Nut, 3/8-16

Capacitor, 1.0-50v

Capacitor, 0.1-100 dc

D-Hose reel to hose reel motor ground strap

Turn signal flasher capacitor

C-Siren-light flasher capacitor

Figure 21-Continued.

that are identical. Capacitors must be the same size

and have the same rating as the parts being replaced. 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 components until the

faulty components are discovered.

Remove the

capacitors and ground straps in the numerical sequence

as illustrated on figure 21.

b. Secondary Suppression Component. Remove

tooth-type lockwashers. If proper suppression is to be

obtained, it is necessary that good metal-to-metal

contact is made by tightening the mounting hardware

employing tooth-type lockwashers.

54.

Testing of Radio Interference Suppression

Components

Test the capacitors for leaks and shorts on a

capacitor tester; replace defective capacitors. If test

equipment is not available and interference is indicated,

isolate the cause of interference by the trial-and-error

method of replacing each capacitor in turn until the

cause of interference is located and eliminated.

Screw, cap, 7 7/16-20 x 1 in.

Screw, cap, 7/16-20 x 1 in.

Washer, flat, 7/16 in.

Washer, flat 7/16 in.

Ground strap (2 rqr)

E - Pump compartment to chassis frame ground strap

Figure 21--Continued.

Section VII. RETAINERS, STEPS, TOOL BOX DOOR, GUARDS, HOSE BED ASSEMBLIES, AND LADDER

SUPPORT ASSEMBLIES

brackets are mounted on the rear step. Folding steps

55. General

are mounted at the front of the hose reel compartments

and at the rear of the fire truck. A handrail is mounted

The hose retainer mounted on the right rear of the fire

on the rear of the fire truck and splash guards are

truck provides a means of locking the hoses, inside the

mounted on each side of the fire truck below the

hose compartment. A retainer and bracket provides a

instrument panels. The tool box door is mounted to the

means for mounting two foam applicator tubes. Two

rear step between the fire extinguisher brackets. The

shovel buckets are located on the left rear of the fire

hose bed partition is located on top of the fire truck

truck. The ladder brackets are mounted on the top front

water tank and divides the hose compartment into

of the left side compartments. Two fire extinguishers

TAGO 6839A