Power Steering Pressure Check
PRESSURE CHECK WITH T/N 07406 - 0010001Check the fluid pressure as follows to determine whether the trouble is in the pump or gearbox. First check the power steering fluid level and pump belt tension.
CAUTION: Disconnect the pump outlet hose (high-pressure) with care so as not to spill the power steering fluid on the frame and other parts.
1. Disconnect the pump outlet hose from the pump outlet, then install the P/S joint adapter (pump) on the pump outlet with the P/S joint adapter plate.
2. Connect the P/S joint adapter (hose) to the P/S pressure gauge, then connect the outlet hose to the P/S joint adapter (hose).
3. Install the P/S pressure gauge to the P/S joint adapter (pump).
4. Fully open the shut-off valve.
5. Fully open the pressure control valve.
6. Start the engine and let it idle.
7. Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature.
8. Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should read less than 1,500 kPa (15 kgf/cm2, 213 psi). If it reads high, check the outlet hose or valve body unit see General Troubleshooting.
9. Close the pressure control valve, then close the shut-off valve gradually until the pressure gauge needle is stable. Read the pressure.
10. Immediately open the pressure control valve fully.
CAUTION: Do not keep the pressure control valve closed more than 5 seconds or the pump could be damaged by over-heating.
If the pump is in good condition, the gauge should read at least 7,500 - 8,190 kPa (76.5 - 83.5 kgf/cm2, 1,090 - 1,190 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.
PRESSURE CHECK WITH T/N 07406-001000A
Check the fluid pressure as follows to determine whether the trouble is in the pump or gearbox. First check the power steering fluid level and pump belt tension.
CAUTION: Disconnect the pump outlet hose (high-pressure) with care so as not to spill the power steering fluid on the frame and other parts.
1. Disconnect the pump outlet hose from the pump outlet, then install the P/S joint adapter (pump) on the pump outlet with the P/S joint adapter plate.
2. Connect the P/S joint adapter (hose) to the P/S pressure gauge, then connect the outlet hose to the P/S joint adapter (hose).
3. Install the P/S pressure gauge to the P/S joint adapter (pump).
4. Open the pressure control valve fully.
5. Start the engine and let it idle.
6. Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature.
7. Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should read 1,500 kPa (15 kgf/cm2, 213 psi). If it reads high, check the outlet hose or valve body unit see General Troubleshooting.
8. Gradually close the pressure control valve and immediately read the pressure.
CAUTION: Do not keep the pressure control valve closed more than 5 seconds or the pump could be damaged by over-heating.
9. Open the pressure control valve fully.
If the pump is in good condition, the gauge should read at least 7,500 - 8,190 kPa (76.5 - 83.5 kgf/cm2, 1,090 - 1,190 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.