TM 10-3930-675-20-1
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THEORY OF OPERATION
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INTRODUCTION
1.
The RTCH-RT 240 consists of the following major components and functional systems: drive train, fuel system, exhaust
system, cooling system, electrical and electronic systems, steering and brake systems, hydraulic system, cab system, and
lifting boom with tophandler. A forklift kit may be added as required.
2.
This work package explains how the components and systems of the RT 240 work together. A functional description is
provided for each major component and system.
DRIVE TRAIN
1.
The engine is a six-cylinder turbocharged diesel which supplies power to the transmission. The engine cooling system is
pressurized and includes a thermostat, controlled bypass, and coolant recovery bottle. Engine lubrication is pressurized
and full-flow filters continuously clean oil.
2.
The transmission is a semi-automatic electronically-controlled unit. The operator electronically selects range of gears
and the transmission ECM controls shift points up to the highest selected gear. A shift inhibitor circuit controls down-
shifts in forward and reverse gears. The transmission can be manually or electronically shifted through 4 forward and 3
reverse gears. A torque converter provides interface to the engine.
3.
The drive shafts transmit rotation of the transmission output to the front and rear axles. Connections at both ends are
made thru universal joints to compensate for any misalinements due to operating on uneven surfaces.
4.
The front and rear axles are identical in operating principles. Both axles are hydraulically steered with planetary wheel
ends and wet-disc brakes. The rear axle oscillates above and below horizontal to allow for operation on uneven surfaces.
FUEL SYSTEM
1.
Fuel to power the engine is pumped from the fuel tank by a fuel transfer pump to the electronically controlled fuel injec-
tor nozzles.
2.
The engine electronic control module manages, monitors, and stores key engine functions, to include engine idle speed,
limits maximum engine speed, and engine diagnostic data.
3.
The engine-mounted fuel/water separator is a spin-on replaceable type with drain.
EXHAUST SYSTEM
The exhaust system removes exhaust gases from the engine through the exhaust manifold and turbocharger. The gases
flow into exhaust pipes and muffler to the atmosphere along the right side and to the rear of the operator’s cab.
COOLING SYSTEM
1.
The cooling system consists of an engine-mounted circulating pump, 180°- 200°F (82°- 93°C) thermostat, oil cooler/
after cooler manifolds, a radiator, engine-mounted coolant filter, and hydraulically-driven cooling fan.
2.
The cooling system cools the engine by means of circulating pressurized ethylene glycol-based coolant through the
engine and radiator.
ELECTRICAL SYSTEM
1.
The system voltage is 24 volts. Four 12-volt batteries, connected in series and charged by an alternator across electronic
rectifying and voltage stabilization circuits, provide the voltage.
2.
The negative and positive poles are both connected across the master battery switch. The negative pole is connected to
the chassis.
3.
NATO slave-starting receptacles are provided.
