Steering Gear - Power: Testing
NOTE:
Before testing power steering system, check fluid level, pump pulley, tire pressure and engine idle speed.
- Remove high pressure line from pump. Connect spare pressure hose to pump. Connect Power Steering Pressure Tester (J-5176-D) or Power Steering System Analyzer (J-25323-A) to both hoses.
- Open valve fully. Start and run engine until fluid reaches normal operating temperature. Check fluid level and add as necessary. With engine at operating temperature, pressure reading should be 80-125 psi (5.6-8.8 kg/cm2
). If pressure is more than 200 psi (14 kg/cm2
), inspect system for restrictions or faulty flow control valve.CAUTION: To prevent pump damage, DO NOT hold valve closed for more than 5 seconds in step 3).
- Alternately close and open gauge valve fully 3 times while recording highest pressure obtained. Each reading should be at least 1000 psi (70.3 kg/cm2 ).
- If recorded pressures are all within 50 psi (3.5 kg/cm2 ), pump is okay. If pressures are high and not within 50 psi (3.5 kg/cm2 ) of each other, flow control valve is sticking.
- If pressure readings are less than 1000 psi (70.3 kg/cm2 ), replace flow control valve, then repeat test. Replace rotor and vanes if pressure is still low after replacing flow control valve. See POWER STEERING PUMP under OVERHAUL.
- If pump meets specification, leave valve open. Turn steering wheel from stop to stop. Record and compare highest pressure with maximum pump pressure. If pressure at both stops is not the same as maximum pressure recorded earlier, steering gear is leaking internally.