Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Chevrolet Optra Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Power Steering Pump Specifications

Application	Specification
Application	Metric	English
Gear Type	Power Rack and Pinion
Overall Gear Ratio - Power Steering	16:1
Pressure
without EVO	8 330-8 820 kPa	1,208-1,279 psi
with EVO	8 500-8 960 kPa	1,233-1,299 psi
Wheel Diameter
with Air Bag	380 mm	15.0 in
without Air Bag	370 mm	14.5 in

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.