The driver is able to turn the wheels with less effort because the Nissan Xterra Power Steering Pump generates hydraulic pressure. In Nissan vehicles such as Xterra, the pump is mounted on the engine and driven by the V-belt or serpentine belt connected to the crankshaft. Inside the hydraulic circuit, the Power Steering Pump sucks fluid from a reservoir, delivers pressurized fluid by way of a hose to the control valve, and returns fluid by way of a hose. When the steering wheel is in the center, the steering control valve is designed to ensure that the pressure is the same on both sides of the piston. When the steering wheel is turned, the hydraulic fluid from the Power Steering Pump is directed to one side of the piston to help assist turning the other way. A leaking or noisy Nissan Xterra unit can be the sign of wear, insufficient belt tension, low fluid, or internal failure. A reduced assist at low speeds, squealing from the drive belt, or whining from the Power Steering Pump could mean that your part needs to be checked or replaced. The system ensures that the Nissan Xterra remains steerable if the hydraulic assist from the Power Steering Pump is ever lost.
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