Power Steering Oil Pump

On-Vehicle Inspection and Service

CHECKING RELIEF OIL PRESSURE

CAUTION: Before starting work, confirm belt tension is proper.





1. Connect oil pressure gauge (SST) and oil pressure gauge adapter (SST) between oil pump discharge connector and high pressure hose and then bleed air from the hydraulic circuit.





2. Start engine. Allow engine to run until tank temperature reaches 50 to 80°C (122 to 176°F).

CAUTION:
^ Warm up engine with shut-off valve fully opened. If engine is started with shut-off valve closed, fluid pressure in power steering pump increases to maximum. This will raise fluid temperature excessively.
^ Be careful not to contact hose with belt when engine is started.

3. With engine at idle, close shut-off valve and read the relief oil pressure.
Relief oil pressure: 9,600 - 10,200 kPa (97.9 - 104 kg/cm2, 1,392 - 1,479 psi)

CAUTION: Do not close shut-off valve of pressure gauge for more than 10 seconds.

4. After measurement, open shut-off valve slowly.
^ If relief oil pressure is outside the specification, disassemble and repair oil pump.
5. After inspection, disconnect oil pressure gauge (SST) and oil pressure gauge adapter (SST) from hydraulic circuit, connect oil pump discharge connector and high pressure hose. Add fluid and bleed air from hydraulic circuit thoroughly.