Mitsubishi Pick-ups and Montero 1983-1995 Repair Guide

Power Steering Pump



See Figures 1, 2 and 3

  1. Disconnect the negative battery cable.
  3. Remove the reservoir cap and disconnect the return (lower) hose from the fluid reservoir. Drain the fluid into a clean pan.
  5. Depending on the access for your particular vehicle, raise the vehicle and support it safely on jackstands, if necessary.
  7. If the pulley is to be removed from the pump, loosen the bolts now. Leave them finger-tight in place.
  9. Loosen the pump mounting bolts, move the pump towards the engine and remove the belt. On 3.0L (24 valve) and 3.5L engine-equipped Monteros, loosen the drive belt tensioner adjusting bolt, then remove the belt. Turn the pump by hand to eliminate the fluid from the system.
  11. Disconnect the pressure hose at the top of the pump and the suction hose at the side of the pump. Allow the fluid to drain into the container.
  13. Remove the pump attaching bolts and lift the pump from the brackets.
  15. When reinstalling, make certain the bracket-to-engine bolts are tight, then install the pump to the brackets.
  17. If the pulley was removed, reinstall it and tighten its nuts securely.
  19. Install the drive belt and adjust its tension correctly-refer to General Information & Maintenance .
  21. Connect the pressure and return hoses. Make sure the hoses are not twisted and do not contact any other parts so as to avoid chafing. When installing the pressure hose, make certain that the notch of the fitting contacts the suction connector of the oil pump. The pressure hose may use O-rings to help it seal, remove the old ones and install new ones before installation.
  23. Pour power steering fluid into the reservoir to the lower mark, then bleed the system.
  25. Inspect all the fluid line connections for any sign of leakage.


  1. Remove the reservoir cap and pour fluid in until it reaches the lower mark, if needed.
  3. With the coil high tension line disconnected at the coil, operate the starter intermittently (15 or 20 seconds each time) and turn the steering wheel all the way from left to right and back several times. Do this 5 or 6 times while an assistant keeps watch on the fluid level in the reservoir.

Do not be tempted to bleed the system with the engine idling. The air in the system will be broken up and absorbed into the fluid, resulting in a noisy, foamy mess. During the bleeding procedure, replenish the fluid so that the level never falls below the lower level on the reservoir.

  1. Once the preliminary bleeding is done, the fluid level should stay fairly constant as the wheel is turned while cranking the motor. When this is true, the coil wire may be reconnected and the engine started. Only run the engine at idle; high rpm will not help.
  3. With the engine running, turn the wheel from lock to lock several times and observe the fluid level in the reservoir. The level should not change more than about 0.20 in. (5mm) throughout the full travel of the wheel. The fluid should not look cloudy or milky.

If the system still contains air, the pump will be noisy during operation. This noisy operation can damage the pump. If the fluid level changes markedly during steering wheel movement, the system still contains air. If the fluid level rises suddenly after the engine has been shut off, the system still contains air.

  1. Shut the engine off, fill the reservoir up to the full line, if needed. Install the reservoir cap.

Click image to see an enlarged view

Fig. Fig. 1: Power steering oil pump removal and installation components-1983-95 Pick-up trucks and 1983-89 Monteros

Click image to see an enlarged view

Fig. Fig. 2: Power steering oil pump removal and installation components-1990-95 Monteros

Click image to see an enlarged view

Fig. Fig. 3: When installing the pressure hose, make certain the notch is located in the correct position