Change 11 4-3
Table 4-1. Organizational Preventive Maintenance
Checks and Services Quarterly Schedule
Inspect generator flame valve for leaks and improper operation. Check for leaks
between valve stem and packing nut by using soapy solution. If valve leaks,
tighten nut or repair valve (para 3-4.1).
Check for improper operation by turning
the flame valve knob counterclockwise to open the valve. The knob should
positively stop when completely opened. Any knob failing to positively stop
when fully openedshould have the packing nut tightened or by replacing the
packing (para 3-4.1). Inspect generator for carbon deposits, dents, breaks, and
loose connections. Replace a defective generator (
Inspect for breaks, loose mounting, and clogged slots. During operation, check
for erratic burning and blue or yellow flame. Replace a defective burner (para
Air Pressure Gage
Inspect for breaks, broken glass, or bent needle. Check with tank filler cap
removed to determine the gage reads zero. Then check after filling tank and
closing tank filler cap, the gage will indicate a steady even increase in pressure as
the tank is pressurized with the hand pump. If the gage will not pass above visual
inspection and tests, the gage shall be replaced (para 4-9.5).
Air Control Shutter
Inspect shutter for binding, loose mounting and damaged control lever.
Tighten mounting hardware. Inspect mixing chamber for cracks.
Replace any defective parts (para. 4-9.3).
Use extreme care when utilizing the air compressor to pressurize
the fuel tank.
Inspect device for improper operation, leaks, loose hardware for bent tubing.
Safety system for proper functioning. DRAIN FUEL TANK. Using air
compressor, pressurize tank to approximately 60 (PSIG) where the safety valve
should operate. After the safety opens, pressure should drop rapidly to
approximately 35 ± 10 PSIG at which point the safety valve should close. Using
soapy solution, check for leaks. Set burner unit on end and turn fuel filler cap
slowly counterclockwise to release air pressure. Tighten any loose hardware.
Replace defective device (para 4-9.10).
Section V. TROUBLESHOOTING
This section provides information useful to organizational maintenance personnel in diagnosing and correcting
unsatisfactory operation or failure of the field range outfit.
Refer to table 4-2 for a listing of the possible malfunctions that may occur in the field range outfit.