Parts for your 2004 Mitsubishi Pajero-Power steering pump

2004 Mitsubishi Pajero Power Steering Pump

Based on Mitsubishi’s Pajero NM/NP Workshop Manual (2000–2006), Group 37A – Power Steering, and the Mitsubishi ASA electronic parts catalogue for Oceania, the 2004 Mitsubishi Pajero is factory-fitted with a belt-driven hydraulic power-steering pump across its common engines (including 4M41 diesel and 6G74/6G75 petrol). So a power-steering pump is absolutely relevant for this model.

The pump’s job is straightforward but vital: it pressurises fluid to assist the steering box, making the wheel light and predictable at low speeds, in tight carparks, and when towing or touring out bush. On-road or off, it helps keep steering feel consistent, so the Pajero remains easy to place and less tiring on long runs.

For owners, looking after the pump isn’t hard and pays off with quieter operation and longer component life. Fluid quality matters: use the fluid type specified in the owner’s handbook (commonly ATF meeting Dexron II/III for NM/NP models). Cloudy, burnt-smelling or dark fluid points to overdue service.

• Check and top up the reservoir regularly, inspecting for leaks around the pump, hoses and steering box.
• Inspect the drive belt for cracks, glazing or slack. Correct tension and alignment reduce whine and extend pump life.
• Flush the system every 60,000–100,000 km (or around 4 years), especially if the vehicle tows, does heavy off-roading, or the fluid looks contaminated.

Common signs a Pajero’s pump is on the way out include a whining or groaning noise that follows engine revs, heavier-than-normal steering, aerated fluid (foam) in the reservoir, or visible leaks from the pump body or shaft seal. Addressing these early can save the steering box and hoses from wear caused by contaminated fluid.

If replacing the pump, it’s smart to:

1. Use a quality new or reman unit, and renew O-rings/seals on the pressure and return lines.
2. Flush the system to clear metal particles before fitting the new pump and install a fresh belt.
3. Bleed properly: front wheels off the ground, fill the reservoir, turn lock-to-lock slowly with engine off, top up, then start and repeat until bubbles are gone. Avoid holding full lock for more than a couple of seconds.

Done right, the 2004 Pajero’s hydraulic setup stays quiet, leak-free, and light at the wheel—exactly what’s wanted under a heavy bonnet and with a bullbar, bigger tyres or a load on the towball.

What fluid should go in a 2004 Pajero power steering system?

The Pajero NM/NP typically specifies ATF that meets Dexron II or Dexron III for the power steering system. Always confirm on the reservoir cap or in the owner’s manual. Don’t mix fluid types, if changing spec, fully flush first. Expect roughly a litre to service the reservoir and lines, though a thorough flush may circulate more.

How do you bleed the power steering after changing the pump?

Raise the front wheels, fill the reservoir, then turn the steering wheel slowly from lock to lock 10–20 times with the engine off. Top up as bubbles purge. Start the engine and repeat, avoiding holding full lock. Keep the fluid level between the marks and check for foaming or leaks. A short road test and recheck once cooled finishes the job.

Is it the pump or the steering box causing heavy steering?

A pump that whines with engine RPM, shows leaks at the shaft, or aerates fluid is a prime suspect. If there’s play, wandering, or leaks at the steering box, the box may be at fault. Also check belt condition and tension. A workshop can confirm by measuring system pressure as outlined in the Mitsubishi NM/NP workshop manual.