Power Steering Pump OEM NO.:MR491774 for Mitsubishi Pajero Montero III 99-07 V78 V68 4M41

1. OEM MR491774 Key Details

• Compatibility:

  • Mitsubishi Pajero Montero III (1999–2007)

  • Engine Models: V78, V68, 4M41 Diesel

• Technical Specifications:

  • Pressure Range: 1,200–1,500 PSI

  • Flow Rate: 2.5–3.0 L/min

  • Material: High-strength cast aluminum housing, corrosion-resistant seals

• Certifications: ISO 9001 compliant, meets JIS D0105 hydraulic standards

2. Symptoms & Solutions for Failure

• Common Issues:

  • Whining Noise: Low fluid levels or worn bearings.

  • Stiff Steering: Faulty pressure valve or damaged internal gears.

  • Fluid Leaks: Degraded seals (replace with Viton seals).

• Emergency Actions:

  • Check power steering fluid immediately to prevent dry operation.

  • If leaks persist, stop driving and consult a professional.

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    Step-by-Step Installation Guide

    Tools Needed: 14mm socket, torque wrench, Dexron III fluid, seal kit.

    1. Remove Old Pump:

       • Relieve belt tension, disconnect hoses (use a drain pan).

       • Unbolt the pump (note pulley alignment).

    2. Install New Pump:

       • Clean mounting surface, apply sealant (Loctite 518).

       • Tighten bolts to 20–25 Nm, reconnect hoses.

    3. Bleed & Test:

       • Refill fluid to MAX line, start the engine, and turn steering wheel lock-to-lock 3 times.

       • Top up fluid and check for leaks/noise.

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    5. Maintenance Tips for Longevity

    • Routine Care:

      • Replace fluid every 2 years/60,000 miles (use Idemitsu PSF-3).

      • Inspect belts for cracks/slack (tension: 80–100N).

    • Seasonal Advice:

      • Use low-viscosity fluid (e.g., ATF Dexron VI) in winter to reduce cold-start wear.

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    6. Frequently Asked Questions (FAQ)

    Q1: Does MR491774 fit 2008+ Pajero models?
    → No. Compatible only with 1999–2007 models. Post-2008 models require MR512345.

    Q2: How durable are refurbished pumps?
    → Professionally rebuilt pumps (pressure-tested) last 5–7 years, offering better value than aftermarket parts.

    Q3: Noise persists after installation. Why?
    → Air may remain in the system. Re-bleed or check for air leaks in hoses.