Chapter XV: Section XV: Trouble Shooting

57. PRECAUTIONS.

First, remove the ignition cylinder. Then, before disassembling, servicing, or repairing parts which may be under pressure, be sure to release the pressure. Remove fuel, when necessary.

58. FUEL LEAKS.

_Trouble_ _Remedy_
_a._ Defective or damaged If leak is observed in valve grip,
valve-diaphragm assembly. disassemble. (Par 74) If diaphragm
is torn, or damaged in
any other way, remove and replace.
(Par 75)

_b._ Defective threaded Disconnect, using wrenches. If
connections on fuel lines. thread is stripped or badly damaged,
replace the threaded part.
If threads appear to be sound,
clean them and reconnect. If
leak is between tank coupling and
tank connector or between hose
and fuel-valve body, apply anti-seize
compound before rescrewing.
Tighten joint with wrenches.

_c._ Dirt or foreign matter Clean parts carefully with cloth before
on seats or threads. reassembling.

_d._ Leak at nozzle. Adjust needle. (Par 75 _d_) If leak
persists, either replace needle
and barrel as a unit or use lapping
compound on parts. Turn
needle in seat until parts make a
tight connection when seated.
Remove lapping compound and
reassemble.

_e._ Worn body of hose. Replace fuel-hose assembly. (Par 73)

_f._ Leak at tank coupling. Remove and replace coupling washer
if damaged. (Par 70) If hose
nipple, tank end, is damaged, repair
nipple (Par 73 _d_) or replace
fuel-hose assembly.

59. SAFETY HEAD “BLOWS” (BREAKS).

_Trouble_ _Remedy_
_a._ Defective safety head. Replace with new safety head.
(Par 69 _b_)

_b._ Defective pressure If replacement safety head also
regulator. breaks, follow test procedure in
Paragraph 56 _b_ to determine
whether pressure regulator
needs adjustment or is defective.

60. CARRIER UNCOMFORTABLE.

_Trouble_ _Remedy_
_a._ Cord becomes loose Use only hard-braided seine cord
or breaks. furnished in service kit for
replacements. Lace tightly as
shown in Figure 46, using slip-proof
knots at ends.

_b._ Straps not adjusted to Adjust straps to fit each new wearer.
fit wearer. Tank group must be high
on back and snug on body. (Pars
19 and 71)

_c._ Carrier frame Cord is too loose. Tighten cord.
presses on wearer’s back. Use slip-proof knots at ends.

61. SHORT RANGE.

_Trouble_ _Remedy_
_a._ Stream of burning fuel Fuel valve is not fully open because
issues at an angle or in a of:
very broad spray. (1) Faulty operation. Be sure to
compress controls all the way
when firing. (Par 26)

(2) Improper adjustment or assembly
of valve. To correct,
see Paragraphs 74 and 75.

_b._ Rapid drop of range Pressure-tank valve is not fully
during a burst. open. Open all the way. If this
is not effective, test pressure
regulator. (Par 67 _d_)

_c._ Shorter range in each Pressure tank is not fully charged.
successive burst. (1) Before firing be sure tank is

charged to at least 1,700 pounds
per square inch. (Par 32)

(2) Check for leaks to make sure
pressure has not decreased
since charging. (Par 53 _d_)

_d._ Short range with Dried fuel or other foreign matter
longer time of discharge is in fuel lines. Disassemble and
than 8 to 9 seconds. clean.

62. FUEL-VALVE FAILURE.

_Trouble_ _Remedy_
Valve fails to close when (1) Work the grip safety to trip
controls are released. the valve lever.

(2) Foreign matter may be in barrel,
or barrel may be dented.
If dented, replace barrel and
needle as a unit. If not dented,
disassemble and clean. (Pars
74 and 75)

63. FAILURE OF IGNITION CYLINDER TO IGNITE.

_Trouble_ _Remedy_
_a._ Match in cylinder Pull trigger repeatedly. If cylinder
moves but incendiary does not ignite, remove cylinder
charge does not ignite. (Par 30) and examine.

(1) If matches have been pushed
flush with inner surface of cylinder
body, the cylinder is
defective. Destroy. (Par 30)
Replace.

(2) If matches project 1/16 inch
or more from cylinder, ignition
head is defective. Disassemble
ignition head (Par 76 _b_) and
examine. Replace parts as
necessary. (Par 76 _c_)

_b._ Cylinder does not (1) Spring case is not free to rotate
rotate to bring new charge because of dirt. Clean and lubricate.
into position. (Par 49)

(2) Cylinder is improperly loaded.
(Par 18)

(3) Ignition cylinder binds on barrel
because of dirt or excessive
warping of ignition cylinders
from heat of firing. Remove
and destroy (Par 30) ignition
cylinder. Reload.

(4) Spring case is defective. Replace
as a unit. (Par 76 _b_, _c_)

_c._ Trigger does not (1) When on a mission, use fingers
return to normal position on trigger to pull back to normal
(with ignition cylinder in position.
place). (2) If time permits, remove trigger
rod. (Par 76 _b_) Clean rod
and hole in which rod slides.
Lubricate. (Par 49) Reassemble.
(Par 76 _c_)

_d._ Lack of spring tension Trigger spring is off hook of trigger,
at trigger. off spring screw, or broken.
Replace where necessary.

64. FAILURE OF FUEL TO IGNITE.

_Trouble_ _Remedy_
_a._ Atomizer hole clogged. Clean with fine wire. (Par 52 _i_)

_b._ Fuel troubles at low (1) At temperatures below minus
temperature. 20 degrees Fahrenheit, ignition
of any standard fuel is uncertain.
Operation at these temperatures
should be avoided unless tests
of fuels by firing with flame
throwers are first made.

(2) At temperatures above minus
20 degrees Fahrenheit, no difficulty
should be experienced with
thickened gasoline. When
blended fuels are used, the
ratio of gasoline content should
be increased as temperature
decreases.

_c._ Failure of ignition See Paragraph 63.
cylinder.