Snow and Ice Control
25
Note: 6 inches of snow may be plowed with the entire blade width, 9
inches with 3/4 blade width, and 12 inches with 1/2 blade width. Experience and
"feel" are the best guides; however, if in doubt, slow down and plow less snow
until a clear path is established.
When plowing deep snow, keep the vehicle moving. (If stopped by
deep snow you may have to back up and raise the blade and/or
attempt a smaller cut using less width of the plow.)
25. Although the HMMWV has plenty of power for snowplowing opera-
tions, there is always the possibility of losing traction. Use tire chains in deep
snow, or when operating on hills, or when slippery conditions exist or may exist.
Install the chains with tire at maximum inflation pressure; readjust to ensure
tightness after operating approximately 2/10 of a mile and then reduce tire
pressure to lowest inflation pressures allowable (see HMMWV Operators
Manual). This ensures that chains are snug and provides optimum traction.
26. Counterbalancing may help to provide maximum traction. Any counter-
balancing material, (sand, sand bags, blocks, drums, etc.) must be solidly secured
to the vehicle to prevent it from moving under harsh plowing conditions. For the
HMMWV, the maximum allowable added weight is 900 pounds. It appears from
tests and experience that, under most conditions, counterbalancing is not neces-
sary. Tire chains should be the primary method of traction enhancement for all
conditions. Counterbalancing with 450 to 500 pounds could be useful in unusual
conditions of snow and ice; however, chains are always required.
27. When clearing small access roads or driveways, do the following:
Head into the driveway or access road with the blade angled and
plow the snow away from any buildings. Widen the driveway or
roadway by rolling the snow back with the blade angled to its
maximum.
If a building is at the end of the driveway, plow to within a vehicle
length of the building. Push as much snow as possible off the
driveway.
With a raised straight blade (no angle on the blade), drive through
the remaining snow to the building; drop the blade and "back-drag"
snow away from the building for at least one vehicle length. Repeat
as necessary to clean the snow away. Then back the vehicle to
building and plow forward, removing the remaining snow from the
driveway.
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