TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 107 of 926

TM 9-2320-283-20-1

PRINCIPLES OF OPERATION.

1-22.

STEERING SYSTEM.

POWER STEERING COOLER.

Cools power steering fluid by means of a finned unit on vehicle grille, exposed to outside

air.

After the fluid is cooled, it is returned to the power steering system.

STEERING COOLER RETURN LINE.

Carries hydraulic fluid from power steering cooler back to reservoir.

STEERING GEAR SUPPLY LINE.

Carries hydraulic fluid under pressure from pump to steering gear.

HYDRAULIC PUMP AND RESERVOIR.

Pump supplies hydraulic pressure to power steering system.

Reservoir provides

a supply of oil to assure complete filling of hydraulic system.

STEERING WHEEL.

Provides rotational torque to steering shaft, actuating steering system.

STEERING COLUMNS.

Transmit torque from steering wheel to steering gear.

UNIVERSAL JOINTS.

Change angle of torque from steering wheel and applies it to input shaft of power steering gear.

TIE ROD ASSEMBLY.

Connects steering arms so that wheels turn together.

STEERING ARM.

Transmits forward and backward movement from drag link to knuckle assembly.

DRAG LINK.

Transfers motion of pitman arm to steering arm and tie rod.

PITMAN ARM.

Transfers steering torque (boosted by power steering gear) to drag link.

POWER STEERING GEAR.

Hydraulically multiplies input torque from steering column and transmits it to pitman arm.

STEERING COOLER SUPPLY LINE.

Carries hydraulic fluid from steering gear to power steering cooler.

TA 236802

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