TM 10-3930-675-100003 00-1THEORY OF OPERATION0003 00INTRODUCTION1.The RTCH-RT 240 consists of the following major components and functional systems: drive train, fuel system, exhaustsystem, cooling system, electrical and electronic systems, steering and brake systems, hydraulic system, cab system, andlifting 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 isprovided for each major component and system.DRIVE TRAIN1.The engine is a six-cylinder turbocharged diesel which supplies power to the transmission. The engine cooling system ispressurized and includes a thermostat, controlled bypass, and coolant recovery bottle. Engine lubrication is pressurizedand a full-flow filter continuously cleans oil.2.The transmission is a semi-automatic electronically-controlled unit. The operator electronically selects range of gearsand 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 3reverse 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 aremade through 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 wheelends and wet-disc brakes. The rear axle oscillates above and below horizontal to allow for operation on uneven surfaces.FUEL SYSTEM1.Fuel to power the engine is pumped from the fuel tank by an engine-mounted fuel pump to the electronically controlledfuel injector 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 SYSTEMThe exhaust system removes exhaust gases from the engine through the exhaust manifold and turbocharger. The gasesflow into exhaust pipes and muffler to the atmosphere along the right side and to the rear of the operator’s cab.COOLING SYSTEM1.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 theengine and radiator. ELECTRICAL SYSTEM1.The system voltage is 24 volts. Four 12-volt batteries, connected in series/parallel configuration and charged by an alter-nator 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 tothe chassis.3.NATO slave-starting receptacles are provided.
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