With Tool 07406-001000A

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.
1. Check the power steering fluid level, and pump belt tension.





2. Disconnect the pump outlet hose from the pump outlet with care so as not to spill the power steering fluid on the frame and other parts, then install the P/S joint adapter (pump) on the pump outlet.
3. 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).
4. Install the P/S pressure gauge to the P/S joint adapter (pump).





5. Open the pressure control valve fully.
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 1,500 kPa (15 kgf/cm2, 213 psi). If it reads high, check the outlet hose or valve body unit.
9. Close the pressure control valve gradually and read the pressure.

CAUTION: Do not keep the pressure control valve closed more than 5 seconds or the pump could be damaged by overheating.

10. Immediately open the pressure control valve fully.
If the pump is in good condition, the gauge should read at least 6,900 - 7,800 kPa (70 - 80 kgf/cm2, 1,000 - 1,140 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.