TM 5-3805-261-23-1
THEORY OF OPERATION
130G SERIES GRADER
0003 00
The 130G Series Grader is an all-purpose, medium sized, wheeled machine 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. The CCE and Type I machines have sound-suppress-
ing ROPS cab with insulation, heater, and windows which allows for all-weather operation.
The machine is made up of the following systems:
Engine. The turbocharged engine is an internal combustion power unit. The engine uses the heat of compression to
a.
ignite the fuel. Fuel flow and engine speed are controlled by the fuel injection pump governor and fuel injectors.
Fuel System. Fuel is drawn from the tank by a fuel transfer pump, filtered by a primary fuel filter, routed to the
b.
secondary filter and fuel injection pump and then injected through the fuel injector nozzles into the engine cylin-
ders. 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.
Exhaust System. Engine combustion by-products are channeled through the exhaust manifold, muffler, and
c.
exhaust pipe. The muffler aids in quieting engine noise.
Cooling System. Provides coolant to the engine. Coolant is circulated through the engine by a gear driven water
d.
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.
Electrical System. The 24-volt system with negative ground is powered by two 12-volt batteries connected in
e.
series. Alternator is mounted on the engine and is driven by a V-belt. Battery disconnect switch controls battery
power to the main light switch and the starting motor. A back-up alarm is also included.
Transmission. Six speeds are provided in both forward and reverse. A transmission modulator places the transmis-
f.
sion in neutral. Another foot pedal provides limited (slow) movement for close quarter maneuvering.
Final Drive Assembly. Axle shafts turn the planetary gears of the final drive. Final drive sprockets turn the rear
g.
wheel spindles through drive chains within the tandem axle housings.
Front Axle Assembly. A trunnion mounted solid front axle swings a maximum of 32 degrees and provides 24 in.
h.
(61 cm) of ground clearance.
Rear Axle Differential and Lock Differential. A four-wheeled tandem rear axle arrangement houses axle shafts
i.
driven by a lock-unlock equipped differential. The axle shafts turn the final drive sprocket chains through plane-
tary reduction gears. The sprocket chains then drive the sprocket spindles and wheels.
j.
Air Brake System.
(1)
The rear four-wheel brakes are air actuated and of multiple oil disc design. They are housed within the
wheel spindle housings. A pedal operated valve at the cab controls the braking air pressure. An engine
driven, two cylinder air compressor supplies a two section air reservoir to provide braking pressure.
(2)
The manually actuated multiple oil disc parking/emergency brake located in the transmission case is
spring engaged and air disengaged. A dual circuit air system arrangement maintains one half of the service
braking power in the event of a brake system circuit malfunction. If service brakes are lost, the parking/
emergency brake can be applied.
Wheels and Tires. Tire and wheel assemblies are interchangeable. There are six tubeless 13.00-24 (10 PR) trac-
k.
tion type tires.
Steering. The engine driven main hydraulic system pump powers two hydraulic steering cylinders, controlling the
l.
front wheels. An electrical supplemental steering pump is automatically actuated and supplies power for steering
in the event that the main pump fails. The articulated cylinders are driven by the main hydraulic pump.
