Hard Steering

1. Check the power assist (see Power Assist Check  ).

   Is the starting load more than 29 N (3.0 kgf, 6.6 Ft.Lbs.)? 

   1. YES  - Go to step 2.
   2. NO  - Power assist is OK.
2. Measure steady-state fluid pressure from the pump at idle with T/N 07406-0010001 (see step  9 on ) or T/N 07406-001000A (see step  8 on ).

   Is the pressure 1,500 kPa (15 kgf/cm ²  , 213 psi) or less? 

   1. YES  - Go to step 3.
   2. NO  - Go to step  7 .
3. Measure the pump relief pressure at idle with T/N 07406-0010001 (see step  11 on ) or T/N 07406-001000A (see step  10 on ).

   Is the pressure 7,460-8,140 kPa (76-83 kgf/cm ²  , 1,080-1,180 psi) or less? 

   1. YES  - Go to step 4.
   2. NO  - Faulty pump assembly.
4. With a spring scale, measure the power assist in both directions, to the left and to the right.

   Are the two measurements within 2.9 N (0.3 kgf, 0.66 Ft.Lbs.) of each other? 

   1. YES  - Go to step 5.
   2. NO  - Go to step  8 .
5. Measure the fluid pressure with T/N 07406-0010001 (see step  12 on ) or with T/N 07406-001000A (see step  11 on ) with both pressure gauge valves open (if so equipped), while turning the steering wheel fully to the left and fully to the right.

   Is the pressure 7,460-8,140 kPa (76-83 kgf/cm ²  , 1,080-1,180 psi) or less? 

   1. YES  - Go to step 6.
   2. NO  - Faulty gearbox.
6. Adjust the rack guide (see Rack Guide Adjustment  ), and retest.

   Is the steering OK? 

   1. YES  - Repair is completed.
   2. NO  - Faulty gearbox.
7. Check the feed and return lines between the pump and the gearbox for clogging and deformation.

   Are the lines clogged or deformed? 

   1. YES  - Repair or replace the lines.
   2. NO  - Faulty valve body unit or pump.
8. Check the cylinder lines for deformation (see Fluid Leakage Inspection  )

   Are the lines deformed? 

   1. YES  - Replace the lines.
   2. NO  - Go to step 9.
9. Check for a bent rack shaft or misadjusted rack guide (too tight).

Is the rack shaft bent or the rack guide adjusted too tight? 

1. YES  - Replace the steering gearbox or readjust the rack guide.
2. NO  - Faulty valve body unit.