Checking Hydraulic System

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 shutoff valve fully opened. If engine is started with shutoff valve closed, fluid pressure in power steering pump increase 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 shutoff valve and read the relief oil pressure.
Relief oil pressure specification: 9,600 - 10,200 kPa (98 - 104 kgf/cm2, 1,390 - 1,480 psi)
4. After measurement, open shutoff valve slowly.
^ If relief oil pressure is outside the specification, disassemble and repair oil pump. Refer to Disassembly and Assembly.
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. Refer to Air Bleeding Hydraulic System.