TM 10-3930-675-24-1
THEORY OF OPERATION
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
0003 00
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 expansion tank. 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 electronic control module (ECM) controls shift points up to the highest selected gear. A shift inhib-
itor circuit controls downshifts 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 driveshafts transmit rotation of the transmission output to the front and rear axles. Connections at both ends are
made through universal joints to compensate for any misalignment 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
0003 00
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 ECM 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
0003 00
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
0003 00
1.
The cooling system consists of an engine-mounted circulating pump, 180 to 200F (82 to 93C) thermostat, oil cooler/
aftercooler 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
0003 00
1.
The system voltage is 24V. Four 12V batteries, connected in series-parallel and charged by an alternator across elec-
tronic 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.
