Hard Steering

Hard Steering
1. Check the power assist.
Is the initial turning load more than 29 N (3.0 kgf, 6.6 lbs.)?
YES-Go to step 2.
NO-Power assist is OK.
2. Connect the P/S pressure gauge T/N 07406-0010001 or T/N 07406-001000A to the pump.
3. Measure steady-state fluid pressure from the pump at idle with T/N 07406-0010001 or T/N 07406-001000A.
Is the pressure 1,470 kPa (15 kgf/cm2, 213 psi) or less?
YES-Go to step 4.
NO-Go to step 8.
4. Measure the pump relief pressure at idle with T/N 07406-0010001 or T/N 07406-001000A.
Is the pressure 8,300 - 8,800 kPa (85 - 90 kgf/cm2, 1,210 - 1,280 psi) or more?
YES-Go to step 5.
NO-Go to step 9.
5. 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 6.
NO-Go to step 11.
6. Measure the fluid pressure with T/N 07406-0010001 or with T/N 07406-001000A 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 more?
YES-Go to step 7.
NO-Faulty gearbox.
7. Adjust the rack guide, and retest.
Is the steering OK?
YES-Repair is completed.
NO-Faulty gearbox.
8. Check for feed and return lines between the pump and the gearbox for clogging and deformation.
Are the lines clogged or d deformed?
YES-Repair or replace the lines.
NO-Faulty valve body unit.
9. Disassemble the pump.
10. 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.
11. Check the cylinder lines A and B for deformation.
Are the A or B lines deformed?
YES-Replace the lines.
NO-Go to step 12.
12. Check for a bent rack shaft or misadjusted rack guide (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.