Nissan Pick-ups and Pathfinder 1989-1995

Power Steering Gear

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TURNING TORQUE ADJUSTMENT



  1. Mount the gear on a holding fixture in a vise.
  2.  
  3. Turn the stub shaft (the shaft that connects with the steering column) several turns in either direction.
  4.  
  5. Mount an inch lbs. torque wrench on the stub shaft and turn it lock-to-lock, counting the total number of turns. Divide that number by 2 and position the torque wrench and shaft at the mid-point.
  6.  
  7. Measure the amount of force needed to turn the shaft past the midpoint in both directions. The force should be 3.5 inch lbs. on 1989 models and 11.7 inch lbs. on the 1990-95 models.
  8.  
  9. To correct the adjustment, loosen the locknut on the adjusting screw and turn the screw to give the correct torque. Tighten the locknut to 25-29 ft. lbs. (34-39 Nm).
  10.  

REMOVAL & INSTALLATION



See Figure 1

  1. Matchmark and remove the pitman arm from the sector shaft, using a puller tool.
  2.  
  3. Matchmark and disconnect the steering stub shaft from the gear at the coupling.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Power steering system-all models similar

  1. Disconnect the fluid lines from the gear and cap the lines and openings in the gear.
  2.  
  3. Unbolt and remove the gear assembly from the frame.
  4.  
  5. Installation is the reverse of the removal. When installing, observe the following torque specifications:

    Gear housing-to-frame: 62-71 ft. lbs. (84-96 Nm).
     
    Steering stub shaft-to-coupling: 17-22 ft. lbs. (24-29 Nm).
     
    Pitman arm-to-sector shaft (refer to the service procedures above).
     

  6.  

OVERHAUL



See Figure 2

If assembly does not meet specifications-replace the steering gear with a complete unit.

  1. Check the turning torque.
  2.  
  3. Remove the adjusting screw locknut and replace the O-ring.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the power steering gear

  1. Turn the stub shaft 2.14 turns (two full turns and then another 50) from its lock position and then disconnect the sector shaft cover bolt. Do not turn the locknut unless absolutely necessary.
  2.  
  3. Using a plastic mallet, carefully knock the sector shaft out approximately 20mm (0.79 in.). Wrap a thin sheet of plastic around the shaft and work it down the shaft as you pull it out of the housing; this will ensure that the needle bearings do not fall out.
  4.  
  5. Remove the gear housing dust seal.
  6.  
  7. Remove the snapring.
  8.  
  9. Remove the back-up ring and oil seal and then remove the O-ring.
  10.  
  11. Loosen the rear housing bolts. Turn the stub shaft counterclockwise slightly so that the intermediate cover raises itself through the piston. Remove the rear housing with the worm gear assembly.
  12.  
  13. Turn the housing/worm assembly upside down and tap it lightly on the bench.
  14.  
  15. Remove the oil seal and then remove the O-ring on each side of the intermediate cover.
  16.  

To assemble:
  1. Install a new oil seal in the rear housing and install new O-rings into the intermediate cover.
  2.  
  3. Press the rear housing onto the intermediate cover with the worm assembly.
  4.  
  5. Install the entire assembly into the gear housing. Tighten the housing bolts in a crisscross pattern.
  6.  
  7. Press in a new oil seal and install the back-up ring.
  8.  
  9. Install a new snap ring into the gear housing.
  10.  
  11. Use shims and adjust the sector shaft end-play so that it is 0.0004-0.0012 in. (0.01-0.03mm).
  12.  
  13. Press a new O-ring into the sector shaft cover.
  14.  
  15. Turn the piston rack about 10-15 toward yourself and then gradually insert it into the gear housing.
  16.  
  17. Tighten the sector shaft cover bolts in a crisscross pattern.
  18.  

 
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