Inspection Of Power Steering Pump

1. INSPECT BUSHING AND MEASURE BUSHING OIL CLEARANCE

(a) Check bushing for wear or damage. The bushing cannot be replaced separately.

If wear or damage is found, replace entire housing.

(b) Check the oil clearance between the bushing and rotor shaft.

Maximum oil clearance: 0.07 mm (0.0028 in.)

2. IF NECESSARY, REPLACE ROTOR SHAFT BEARING

(a) Using snap ring pliers, remove the snap ring.

(b) Using a press, press out the bearing.

(c) Using a press, press in the bearing.

(d) Using snap ring pliers, install the snap ring.

3. INSPECT ROTOR AND CAM RING

Measure the cam ring thickness. Check that the difference between the rotor and cam ring measurement is less than maximum.

Maximum difference: 0.06 mm (0.0024 in.)

If the difference is excessive, replace the cam ring with one stamped with the same letter on the rotor.

4. INSPECT AND MEASURE VANE PLATES

(a) Check the vane plates for wear or scratches.

(b) Measure the length, height and thickness of the vane plates.

Minimum length: 14.97 mm (0.5894 in.) Minimum height: 7.8 mm (0.307 in.) Minimum thickness: 1.7 mm (0.067 in.)

(c) Measure the clearance between the vane plate and rotor groove.

Maximum clearance: 0.06 mm (0.0024 in.)

NOTE: There are five vane lengths with the following rotor and cam ring marks:

Rotor and cam ring mark

Vane length mm (in.)

None

14.996 - 14.998 (0.5904 -0.5905)

1

14.994 - 14.996 (0.5903 - 0.5904)

2

14.992 - 14.994 (0.5902 - 0.5903)

3

14.990 - 14.992 (0.59016 - 0.59024)

4

14.988 - 14.990 (0.5901 - 0.5902)

Compressed Air

Compressed Air

5. INSPECT FLOW CONTROL VALVE AND MEASURE SPRING

(a) Check the flow control valve for wear or damage.

(b) Apply fluid to the valve and check that it falls smoothly into the valve hole by its own weight.

(c) Check the flow control valve for leakage.

• Close one of the holes and apply compressed air [4 or 5 kg/cm2 (57 or 71 psi, 392 or 490 kPa)] into the opposite side.

• Confirm that air does not come out from the end hole.

If necessary, replace the valve with one stamped with the same letter on the rear housing.

(d) Check that the spring is within specification.

Standard length 50.0 mm (1.969 in.) Minimum length 47.0 mm (1.850 in.)

If the spring is not within specification, replace the spring.

6. IF NECESSARY REPLACE UNION SEAT

(a) Using a screw extractor wrench, remove the union seat.

(b) Install a new floating type union seat. NOTE: Only floating type parts are available.

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