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Section IV. TROUBLESHOOTING - TM-5-4210-205-120095
Up
TM-5-4210-205-12 Truck Fire Fighting; Powered Pumper; Foam and Water 500 G.M.P.; Centrifugal Pump Power Take Off Driven; 400 Gal. Water Tank 40 Gal. Manual
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Figure 21. Radio interference suppression components.
Hose reel motor defective.
Tighten
loose
wiring
47.
Spotlight, Floodlights or Warning Lights
connections.
Replace
Inoperative
defective  motor  (para.
Probable cause
Possible remedy
Wiring defective.
Tighten  loose  connections
and  replace  wiring  as
46. Siren Inoperative
necessary (para. 80).
Beacon warning light switch Replace defective beacon
Probable cause
Possible remedy
defective.
warning light switch (para.
Wiring defective.
Tighten  loose  connections
and  replace  wiring  as
Rear floodlight defective.
Replace defective rear flood-
necessary (para. 80).
Beacon warning light defec-
Siren hand switch defective. Replace
defective
hand
tive.
Replace or repair defective
beacon warning light (para.
Defective siren.
Replace or repair defective
Spotlight defective.
Replace defective spotlight
Section V. FIELD EXPEDIENT REPAIRS
49. Transfer Case Lever Disengages
48. Field Expedient Repairs
Organizational maintenance troubles may occur
Trouble
Expedient remedy
Control lever will not stay in Wedge, block, or tie the
while the Ward Lafrance Model M44A1WLF Fire Truck
desired position.
control lever in the desired
is operating in the field where supplies and repair parts
position.
are not available and normal corrective action cannot be
performed.  When this condition exists, the following
50. Loss of Water or Foam
expedient repairs may be used in emergencies, upon
the decision of the unit commander.  Equipment so
Trouble
Expedient remedy
Hole in water or foam tank.
Plug hole with wooden plug
repaired must be removed from operation as soon as
or metal screw.
possible and properly repaired before being placed in
operation again.
Section VI. RADIO INTERFERENCE SUPPRESSION
are illustrated on figure 21.
51. General Methods Used To Attain Suppression
Essentially, suppression is attained by providing a
(2)
Ground strap.  The unit has four
low resistance path to ground for stray currents. The
ground straps, two from chassis to frame and one each
methods used include shielding the ignition and high-
located on the frame to hose motor assemblies. The
frequency wires, grounding the frame with bonding
ground straps are illustrated on figure 21.
straps, and using capacitors and resistors. For general
information on radio interference suppression, see TM
(3)
Secondary Suppression Components.
11-483.
Tooth-type lockwashers are used to assure good metal-
to-metal contact where electrical components are
52. Interference Suppression Components
mounted.
53. Replacement of Suppression Components
a.
Primary Suppression Components.
a.
Primary Suppression Components. Replace
(1)
Capacitors..  The fire truck has four
ratio interference components with new components
capacitors locate(l on the turn signal flasher, siren, siren
flasher, and beacon warning light.  The capacitors
TAGO 6839A
42

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