4-Ton Truck, 4x4 (Four Wheel Drive Model HAR-1) - TM 9-815 War Department Technical Manual

a. This manual is published for the information and guidance of the using arms and services.

b. In addition to a description of the FWD 4x4 Model HAR-1 General Service Cargo Truck, this manual contains descriptions of the major units, group assemblies, and functional systems, including instructions with reference to their operation, inspection, adjustments, minor repair, and unit replacement. Specific information for the guidance of operating personnel (crew) is contained in Part I, sections I to IX, inclusive. Information for the guidance of organizational maintenance (using arms unit mechanics) is contained in Part II, sections X to XXXI, inclusive.

c. In all cases where the nature of the repair, modification, or adjustment is beyond the scope or facilities of the unit, the responsible ordnance service should be informed, so that trained personnel with suitable tools and equipment may be provided, or proper instructions issued.

2. DESCRIPTION (figs. 1 through 5).

a. This General Service Cargo Truck is a four-wheel drive chassis and is powered with a six-cylinder L-head type of engine. It has a conventional type of transfer case assembly, with a center differential similar to the differential in the front and rear axles. A military type of cargo body is mounted to the chassis with seating capacity for the using arms.

b. A single plate dry disk clutch and constant mesh clash type transmission is used.

Figure I— Cargo Truck HAR-I— Three-quorter Right Front Length, over-all 266.75 in.

Weight of vehicle — empty 11,425 lb Weight of vehicle — loaded 19,425 lb Minimum turning radius 38 Vz ft Fording depth (bottom of transfer case) I 8 V 2 in.

Towing facilities (front) Tow hooks Speeds (all wheels driving)

Maximum allowable speed 35 mph Transmission capacity 6 qt Transfer case capacity 4 qt Gasoline tank capacity (one tank) 40 gal Cooling system capacity 23 qt Air cleaner capacity 1.5 pt Hydraulic brake assembly capacity 2 qt Steering gear capacity 4.75 pt Figure 4 Cargo Truck HAR-1 —Hear a. General (figs. 6 to 12). It is essential that the driver be thoroughly familiar with the controls and their location before attempting to operate the vehicle. The driver should study the controls (figs. 6 to 12), as there are some controls which are not found on standard vehicles.

(1) Ignition Switch (fig. 7). The ignition switch is located directly below the speedometer. This switch is self-contained and does not require a separate key for its operation. It is constructed with a thumb piece which must be turned to the left to complete the electrical circuit necessary to start the engine.

Legend for Figure 8 — Instrument Panel and Controls (2) Lighting Switch (figs. 6 and 7). The lighting switch controls all service and blackout lights. By pulling the switch out to the first position, the blackout lights are turned on. These lights consist of blackout headlights, taillights, and blackout signal light. By depressing the lock button (A, fig. 6) and pulling the switch to the second position, the service lights are turned on. This includes the service headlights and taillights. The circuit is also completed, so that the service stop light will operate, as well as the lights on and within the dash panel. The service stop light is turned on by depressing the brake pedal. By pulling the light switch all the way out, or to the third position, the service stop light only is made operative for daytime operation.

Contents
Part I: Operating InstructionsSection I: Introduction 1-3 3Part Ii: Vehicle Maintenance InstructionsSection XII: Organization Spare PartsPart I—: Operating InstructionsSection I
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