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EQUIPMENT DATA (CONT) -680640035
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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POWER TRAIN -680640037
TM 5-2420-224-20-1
SAFETY, CARE, AND HANDLING
Warnings and cautions are listed in the front of the manual, at the beginning of each task, and
at points where they apply in the maintenance procedures. In addition to these warnings, always
keep in mind the following when working on the SEE/HMMH:
The hydraulic system operates at pressures up to 2450 psi (167 bar).
Be aware of where personnel are at all times when operating front Ioader/forklift and
backhoe/crane.
Do not allow personnel to walk under a raised front loader/forklift or backhoe/crane either
during operation or maintenance.
Always remove all jewelry and wristwatch, and make sure the vehicle MASTER disconnect
switch is OFF before working on the electrical system.
Section
Ill.
PRINCIPLES
OF
OPERATION
OVERVIEW
This section contains information on the principles of operation of the SEE/HMMH.  The general
functional description of the vehicle's separate systems is contained in this section.  Unit maintenance
personnel should be familiar with the principles of operation of these systems before working on or
troubleshooting these systems. A more thorough understanding of the electrical system can be
obtained by referring to the electrical system schematic diagrams In the troubleshooting section In
Chapter 3. The systems and components are:
Page
Power Train
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Shafts . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels and Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical System
Alternator . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . ..
StarterMotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switches and Gages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sending Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake System
Service Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SteeringSystem . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Earthmoving, Material Handling Components and Controls
Front Loader (SEE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Loader Controls (SEE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forklift (HMMH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Forklift Controls (HMMH)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backhoe (SEE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backhoe Controls (SEE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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