THEORY OF OPERATION - TM-5-2410-233-230035

TM 5-2410-233-23

THEORY OF OPERATION

INTRODUCTION

This work package explains how components of the D7F Tractor work together. A functional description of equipment

operation is given for the power train, engine lubrication system, fuel system, engine cooling system, steering and brake sys-

tem, electrical system, dozer hydraulic system, ripper hydraulic system and winch hydraulic system.

POWER TRAIN

TRANSMISSION

TORQUE

DIESEL ENGINE

U-JOINT

DIVIDER

BEVEL

GEAR

FINAL

TRACK

DRIVE

386-467

Diesel Engine. The tractor is powered by an in-line six cylinder diesel engine. SLEP engines have a direct injection fuel

system. Non-SLEP engines use precombustion chambers/glow plugs.

Torque Divider. The torque divider connects the engine to the transmission. The torque divider will increase or

decrease the torque from the engine depending on the load at which the tractor is working.

U-Joint. The U-joint transfers power from the torque divider to the transmission.

Transmission. The transmission controls the speed and direction of the tractor. At this point in the power train the oper-

ator can control the power by moving the transmission selector lever to neutral (N) or one of the three speeds in forward

or reverse.

Bevel Gear. The bevel gear connects transmission to the final drives.

Final Drive. The final drive delivers the power of the power train to the sprocket on each side of the machine, which

turns the track.

Track. The D7F has a steel roller-type track that is sealed and lubricated. Track tension may be adjusted by the operator.