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Rebuilt Power Steering Pump Price: From JPY 60,000

Prices may fluctuate due to the rising cost of parts.

Replacing the entire pump can be a quicker solution in some cases.
However, some users may prefer to disassemble, clean, and rebuild the existing unit — depending on the condition and repair approach.

For such needs, we also offer Customizable Overhaul Kits with the necessary parts.

The images on this page are of actual rebuilt parts supplied by Auto Parts Box Japan.

What Is HICAS? Nissan’s Innovative Steering System

HICAS stands for “High Capacity Actively Controlled Steering”, a rear-wheel steering system developed by Nissan.

Improved Handling Stability and Cornering Response:
The system slightly steers the rear wheels in response to vehicle speed and steering input, helping the car trace the driver’s intended line more precisely. This enhances both high-speed stability and cornering performance.

At high speeds, such as during lane changes, the rear wheels turn in the same direction as the front wheels. This reduces yaw motion (side-to-side sway), contributing to more stable vehicle behavior.

At low to medium speeds, the rear wheels steer in the opposite direction to the front wheels. This effectively shortens the vehicle’s wheelbase, allowing for sharper and more agile cornering.

The Stress Drifting Puts on the Power Steering Pump

1. Frequent and Rapid Steering Input
   • Frequent “lock-to-lock” movements:
     During drifting, the driver repeatedly and rapidly turns the steering wheel from full left to full right—something rarely done in normal driving.
     This causes the power steering pump to operate near its maximum pressure almost constantly, putting a significant strain on the system.
   • Quick countersteering:
     Countersteering (turning the wheel in the opposite direction of the vehicle’s slide) must be performed quickly and precisely.
     These sudden and aggressive steering inputs create sharp, momentary loads on both the power steering pump and the rack.
2. High Tire Friction and Steering Kickback
   • Lateral tire slip:
     During a drift, the tires slide sideways across the road surface, generating intense friction.
     This friction translates into strong kickback forces that are fed back into the steering system.
   • Increased resistance:
     In normal driving, most friction occurs in the direction of travel. In drifting, however, the tires are angled and sliding sideways, which increases resistance against the steering axis.
     The power steering system must overcome this resistance, requiring higher hydraulic pressure.
3. Fluid Overheating and Degradation
   • Pump overheating:
     Constant high-output operation and increased resistance cause the power steering fluid temperature to rise rapidly.
   • Fluid foaming (cavitation):
     As fluid temperature increases, viscosity decreases. Under intense pump operation, this can cause cavitation—where air bubbles form in the fluid.
     Since air is compressible, this leads to unstable hydraulic pressure and, at times, temporary loss of steering assist.
   • Fluid overflow:
     Foaming increases the volume of the fluid, which may cause it to overflow from the reservoir tank.
     If the fluid contacts hot engine components, it could be dangerous.
     In addition, a loss of fluid can lead to pump starvation or even pump failure due to overheating.