Pump Pressure Test With T/N 07406-001000A
Pump Pressure Test with T/N 07406-001000ASpecial Tools Required
^ P/S joint adapter (pump) 07RAK-SO40111 or 07RAK-S040110
^ P/S joint adapter (hose) 07RAK-SO40122
^ P/S pressure gauge 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.
2. Remove the cowl cover and under-cowl panel.
3. Remove the pump outlet hose clamp (A) from the intake manifold.
4. Disconnect the pump outlet hose, then install the P/S joint adapter (pump) on the pump (A). Take care so as not to spill the power steering fluid on the frame and other parts.
5. Install the P/S pressure gauge to the P/S joint adapter (pump).
6. Connect the P/S joint adapter (hose) to the P/S pressure gauge.
7. Connect the pump outlet hose (A) to the P/S joint adapter (hose).
8. Open the shut-off valve (A) fully.
9. Start the engine, and let it idle.
10. Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature at 158 °F (70°C).
11. Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should be no more than 1,470 kPa (15 kgf/cm2, 213 psi). If it reads higher, check for:
^ Clogged or deformed pump outlet or return line between the pump and gearbox.
^ Clogged valve body unit.
12. Raise the engine speed to 3,000 rpm, and measure the fluid pressure. If the pump is in good condition, the gauge should read at least 1,470 kPa (15 kgf/cm2, 213 psi). If it reads higher, repair or replace the pump.
13. Lower the engine speed, and let it idle. Close the shut-off valve gradually until the pressure gauge needle is stable. Read the pressure.
NOTICE; Do not keep the shut-off valve closed more than 5 seconds or the pump could be damaged by overheating.
14. Immediately open the shut-off valve fully. If the pump is in good condition, the gauge should read at least 7,850 - 8,550 kPa (80 - 87 kgf/cm2, 1,140 - 1,240 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.
15. Reinstall all removed parts.