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

The OEM MR491774 power steering pump is designed for Mitsubishi Pajero Montero III models (1999–2007) with V78, V68, or 4M41 diesel engines. This guide provides exact compatibility details, symptoms of failure (e.g., fluid leaks, steering stiffness), and trusted sources for new/refurbished pumps. Includes installation instructions, maintenance best practices, and FAQs to ensure optimal performance.

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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.


    • 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.

      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.

      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.


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