Power Steering Pump: Description and Operation

DESCRIPTION - 4.0L, 4.7L

Fig. 1:

Hydraulic pressure for the power steering system is provided by a belt driven power steering pump and. The pump shaft has a pressed-on drive pulley that is belt driven by the crank shaft lever

OPERATION
OPERATION - 4.7L
The power steering pump is a constant flow rate and displacement, vane-type pump. The pump has internal parts that operate submerged in fluid. The flow control orifice and the pressure relief valve, which limits the pump pressure, are internal to the pump. The reservoir is attached to the pump body with spring clips. The power steering pump is used to drive the hydraulic engine cooling fan, which separates the flow to the fan gerotors and the power steering gear. The power steering pump is connected to the engine cooling fan by pressure and return hoses and the pump is connected to the steering gear via a return hose from the steering cooler.

NOTE: Power steering pumps have different pressure rates and are not interchangeable with other pumps.

OPERATION - 4.0L
The power steering pump is a constant flow rate and displacement, vane-type pump. The pump internal parts operate submerged in fluid. The flow control orifice is part of the high pressure line fitting. The pressure relief valve inside the flow control valve limits the pump pressure. The reservoir is attached to the pump body with spring clips. The power steering pump is connected to the steering gear by the pressure and return hoses.

NOTE: Power steering pumps have different pressure rates and are not interchangeable with other pumps.