Power Steering Pump: Testing and Inspection
INSPECTIONBasic Inspection
Perform the inspection procedures and repair or replace defective parts.
^ In accordance with the provided table, check all removed parts for wear and damage, and make repair or replacement if necessary.
Service Limit
Make a measurement as follows. If it exceeds the specified service limit, replace the parts with new ones.
CAUTION:
^ Fix oil pump on a vise to make a measurement. At this time, hold oil pump with the least possible force between two wood pieces.
^ Do not set outside of flow control valve or pulley on a vise; otherwise outside or pulley might be deformed. Select properly sized wood pieces.
1. Play of pulley shaft
On condition: P: 9.8 N (1.0 kg, 2.2 lb)
Service limit.
Radial play (Direction 0.4 mm (0.016 inch) or less
Axial play (Direction ) 0.6 mm (0.024 inch) or less
2. Ditch deflection of pulley
Service limit. 1.0 mm (0.039 inch) or less
NOTE: Read the value for one surface of V ditch, and then the value for another off the dial.
3. Resistance to rotation of pulley
Service limit: Maximum load; 9.22 N (0.94 kg, 2.07 lb) or less
NOTE:
^ A rather higher value may be indicated when pulley starts turning.
^ Measure the load during rotation and make a judgment.
Hydraulic Pressure
CAUTION:
^ Be sure to complete all items aforementioned in "INSPECTION", prior to measuring hydraulic pressure. Otherwise, pressure can not be measured correctly.
^ Do not leave the valve of pressure gauge closed or hold the steering wheel at stop end for 5 seconds or more in any case, as the oil pump may be damaged due to long keep of these conditions.
^ Put cotton cloth waste at a place where fluid drops before pressure gauge is installed. Wipe off split fluid thoroughly after the measurement.
NOTE: Keep engine idling during the measurement.
1. MEASURE REGULAR PRESSURE.
1. Remove two bolts securing power steering pipes to engine.
2. Install ST1, 2 and 3 between power steering pump and pipes using gasket (Part No. 34621AC021 and bolt (Part No. 34620AC010).
3. Replenish power steering fluid up to specified level.
4. Open valve, and start the engine.
5. Measure regular pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
Service limit: 981 kPa (10 kgf-cm2, 142 psi) or less
6. If it is not within the specified value, replace the troubled part caused by the following symptoms; pipe or hose clogged, leaks from fluid line, and mix of foreign objects in fluid line.
2. MEASURE RELIEF PRESSURE.
1. Using STs, measure relief pressure.
2. Close valve.
3. Measure relief pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
Service limit. 9,611 - 10,199 kPa (98 - 104 kgf-cm2, 1,394 - 1,479 psi)
4. If it is not within the specified value, replace the oil pump.
3. MEASURE WORKING PRESSURE.
1. Using STs, measure working pressure.
2. Open valve.
3. Measure working pressure of control valve by turning wheel from stop to stop.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
Service limit: 9,611 - 10,199 kPa (98 - 104 kgf-cm2, 1,394 - 1,479 psi)
4. If it is within the specified value, measure steering effort. If it is not within specified value, replace control valve itself or control valve and pinion as a single unit with new ones.