Power Steering Pump: Testing and Inspection
INSPECTIONBASIC INSPECTION
Perform the following inspection procedures and replace any faulty parts.
SERVICE LIMIT
Make a measurements as follows. If it exceeds the service limit, replace with a new part.
CAUTION:
^ When securing the oil pump on a vise, hold the oil pump with the least possible force between two pieces of wood.
^ Do not set the 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 the pulley shaft
Condition:
P: When applying a force of 9.8 N (1.0 kgf, 2.2 lbf)
Service limit:
Play in the radial direction (Direction [black arrows outward] ):
0.2 mm (0.008 in) or less
Axial play (Direction [white arrows outward]):
0.9 mm (0.035 in) or less
2) Deflection of the pulley groove
Service limit:
1.0 mm (0.039 in) or less
NOTE:
Read the value on one surface of V groove, set the dial gauge on the other surface, and read the value of the dial gauge.
3) Rotating resistance of pulley
Service limit:
Maximum load: 9.22 N (0.94 kgf, 2.07 lbf) or less
NOTE:
^ A rather higher value may be indicated when pulley starts turning.
^ Measure the load during rotation to make a judgment.
HYDRAULIC PRESSURE
CAUTION:
^ To measure hydraulic pressure correctly, be sure to complete all the items in "INSPECTION", prior to performing the measurement. Testing and Inspection
^ Do not leave the valve of pressure gauge closed or hold the steering wheel at lock for 5 seconds or more in any case, this can damage the oil pump.
^ Before attaching a pressure gauge, place cloth at locations where fluid is expected to spill. Wipe off any spilt fluid completely after the measurement.
Regular pressure measurement
1) Connect the ST1, ST2 and ST3.
Preparation tool:
ST1: PRESSURE GAUGE (925711000)
ST2: ADAPTER HOSE B (34099AC020)
ST3: ADAPTER HOSE A (34099AC010)
2) Remove the air intake duct.
3) Disconnect the pressure hose (a) from the pump.
4) Using the gasket (Part No. 34621AC024) and bolt (Part No. 34620AC010), install the ST2 to pump instead of pressure hose (a).
5) Attach the ST3 to the end of pressure hose which is removed from pump.
6) Replenish power steering fluid up to the specified level.
7) Open the valve, and start the engine.
8) Measure the regular pressure.
Service limit:
981 kPa (10 kgf/cm2, 142 psi) or less
9) If it is not within the specification, replace the faulty part for the following problems. (Pipe or hose clogged, leaks from fluid line, and mixture of foreign matter in fluid line)
Relief pressure measurement
1) Attach ST1, ST2 and ST3 to the vehicle body in the same way as for regular pressure measurement.
Preparation tool:
ST1: PRESSURE GAUGE (925711000)
ST2: ADAPTER HOSE B (34099AC020)
ST3: ADAPTER HOSE A (34099AC010)
2) Close the valve.
3) Measure the relief pressure.
Service limit:
H4 model:
8,300 - 9,000 kPa (85 - 92 kgf/cm2, 1,203 - 1,305 psi)
H6 model:
8,900 - 9,600 kPa (91 - 98 kgf/cm2, 1,290 - 1,392 psi)
4) If the torque is not within specified range, replace the oil pump.
Working pressure measurement
1) Attach ST1, ST2 and ST3 to the vehicle body in the same way as for regular pressure measurement.
Preparation tool:
ST1: PRESSURE GAUGE (925711000)
ST2: ADAPTER HOSE B (34099AC020)
ST3: ADAPTER HOSE A (34099AC010)
2) Open the valve.
3) Measure the working pressure of control valve by turning steering wheel from stop to stop.
Service limit:
H4 model:
8,300 - 9,000 kPa (85 - 92 kgf/cm2, 1,203 - 1,305 psi)
H6 model:
8,900 - 9,600 kPa (91 - 98 kgf/cm2, 1,290 - 1,392 psi)
4) If it is out of specification, measure the steering effort. Testing and Inspection
If the steering wheel effort is not within specification, replace the control valve itself or control valve and pinion as a single unit, using new parts.