TM 5-3805-261-20
Section III. PRINCIPLES OF OPERATION.
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130G GRADER. The 130G Grader is an all-purpose, medium sized, wheeled vehicle used for spreading and
evening various types of granular material (dirt, stone, sand, etc.). Power is by a Caterpillar in-line, four-cylinder, direct-
injected, turbocharged and intercooled diesel engine. Hydraulically operated implements allow blade positioning for
forward or backward grading, ditch or embankment grading and snow removal. A scarifier allows loosening of compacted
material prior to grading. Front leaning wheel and frame articulation provide maximum maneuverability. A sound-
suppressing ROPS cab with insulation, heater and windows allows for all-weather operation.
a.
Engine. The turbocharged engine is an internal combustion power unit. The engine uses the heat of
compression to ignite the fuel. Fuel flow and engine speed are controlled by the fuel injection pump governor and fuel
injectors.
b.
Fuel System. Fuel is drawn from the tank by a fuel transfer pump, filtered by a primary fuel filter, routed to
the fuel injection pump and secondary filter and then injected through the fuel injector nozzles into the engine cylinders.
Air is drawn in through dry type replaceable filter elements. A dust ejector removes incoming dust from the air and routes
it out through the exhaust system.
c.
Exhaust System. Engine combustion by-products are channeled through the exhaust manifold, muffler and
exhaust pipe. The muffler aids in quieting engine noise.
d.
Cooling System. Provides coolant to the engine. Coolant is circulated through the engine by a gear driven
water pump. Hydraulic oil cooler is located in front of the radiator. Engine and transmission oil coolers are mounted on
the left side of the engine.
e.
Electrical System. The 24 volt system with negative ground is powered by two batteries. Alternator is
mounted on the engine and driven by a V-belt. Disconnect switch controls battery power to the main light switch and the
starting motor. A back-up alarm is also included.
f.
Transmission. Six speeds are provided in both forward and reverse. A transmission modulator places the
transmission in neutral. Another foot pedal provides limited movement for close quarter maneuvering.
g.
Final Drive Assembly. Axle shafts turn the planetary gears of the final drive. Final drive sprockets turn the
rear wheel spindles through drive chains within the tandem axle housings.
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