Operation Under Rainy or Humid Conditions

2-18. Operation Under Rainy or Humid

2-20. Operation in Snow or Mud

Conditions

a. While operating the tractor, be alert for sharp

drop offs or holes hidden beneath the mud or snow.

a. If the tractor is not in operation and un-

sheltered, protect it with a canvas or other

b. Slightly deflated drive wheel tires will im-

waterproof covering. Remove the cover during dry

prove traction in loose snow or mud. Reinflate tires

periods. Corrosion of the metal may occur quickly

when back on solid ground,

where paint is chipped or scratched.

2-21. Operation in High Altitudes

b. I n s p e c t t h e t r a c t o r o f t e n f o r e x p o s e d ,

a. See that the radiator pressure cap is on tight.

damaged or corroded metal surfaces and report the

Check the fan belt for tightness (para 2-16 a ) .

condition to the proper authority.

E n g i n e overheating may occur at high altitude

2-19. Operation in Salt Water Areas

under heavy load,

a. Wash the tractor frequently with clean, fresh

b. Engine performance may be improved by

water, Be especially careful to clean salt deposits

replacing the standard carburetor main metering

from electrical components and wiring,

jet with a 1 size lean jet when operating between

b. C o a t e x p o s e d m e t a l s u r f a c e s w i t h r u s t -

a p p r o x i m a t e l y 5,000 to 10,000 feet above sea

proofing material. Remove rust immediately and

l e v e l ; a 2 size lean jet between approximately

apply paint or oil as appropriate.

10,000 to 15,000 feet, and a 3 size lean jet between

approximately 15,000 to 20,000 feet.

Section

Vi.

OPERATION

AUXILIARY

MATERIAL

USED

CONJUNCTION

WITH

THE

EQUIPMENT

c. Aim the nozzle at the base of the fire and

2-22. Fire Extinguisher (Dry Chemical Type)

depress the small operating lever with the thumb.

The dry chemical type fire extinguisher is effective

d. Direct the discharge at the base of the fire

in areas where ambient temperature is --25F. and

with a side to side sweeping motion.

above. If winterized (pressurized with nitrogen),

the fire extinguisher may be used in temperatures

2-24. Maintenance

below _ 2 5 F , T h e f i r e e x t i n g u i s h e r i s a 2

Weigh the fire extinguisher every 6 months.

p o u n d , stored-pressure, lever-operated

ex-

Replace the extinguisher if the weight is less than

tinguisher.

4 pounds, or the pressure is below 125 pounds,

The dry chemical type fire extinguisher will be

2.23. Operating Extinguisher

serviced at installation level through Repair and

a. Disconnect the clamp that secures the ex-

Utilities facilities, with the filling agent supplied by

tinguisher to its mounting bracket. Swing the clamp

l o c a l procurement through Troop Supply Chan-

open, and remove the extinguisher.

nels. Refer to TB 5-4200-200-

b. Hold the extinguisher upright and raise the

large locking handle to break the seal.

2-7