Hard Steering

Hard Steering
1. Check the power assist.
Is the power assist more than 29 N (3.0 kgf, 6.5 lbs)?
YES - Go to step 2.
NO - Power assist is OK.
2. Measure steady-state fluid pressure from the pump at idle with T/N 07406-0010001 or with T/N 07406-001000A or T/N 07406-001A101.
Is the pressure 1,500 kPa (15 kgf/cm2, 213 psi) or less ?
YES - Go to step 3.
NO - Go to step 7.
3. Measure the pump relief pressure at idle with T/N 07406-0010001 or with T/N 07406-001000A or T/N 07406-001A101.
Is the pressure 8,300 - 8,800 kPa (85 - 90 kgf/cm, 1,210 - 1,280 psi) or less?
YES - Go to step 4.
NO - Go to step 8.
4. With a spring scale, measure the power assist in both directions, to the left and to the right.
Are the two measurements within 5.0 N (0.51 kgf, 1.12 lbs) of each other?
YES - Go to step 5.
NO - Go to step 9.
5. Measure the fluid pressure with T/N 07406-0010001 or with T/N 07406-001000A or T/N 07406-001A101 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 8,300 - 8,800 kPa (85 - 90 kgf/cm2, 1,210 - 1,280 psi) or less?
YES - Go to step 6.
NO - Faulty gearbox.
6. Adjust the rack guide, and retest.
Is the steering OK ?
YES - Repair is completed.
NO - Faulty gearbox.
7. Check for feed and return lines between the pump and the gearbox for clogging and deformation.
Are the lines clogged or deformed?
YES - Repair or replace the lines.
NO - Faulty valve body unit.
8. Check the flow control valve for smooth movement and leaks.
Is the flow control valve OK?
YES - Faulty pump assembly.
NO - Faulty flow control valve.
9. Check the cylinder lines A and B for deformation.
Are the A or B lines deformed?
YES - Replace the lines.
NO - Go to step 10.
10. Check for a bent rack shaft or misadjusted rack guide it too tight.
Is the rack shaft bent or the rack guide adjusted too tight?
YES - Replace the rack shaft or readjust the rack guide.
NO - Faulty valve body unit.