Power Steering Pump Overhaul

NOTE: A Type-3 power steering pump can be identified by the presence of a remote fluid reservoir. The power steering pump is not serviceable except for the following items:
1. Power steering pump oil seals except for the pump shaft seal.
2. Power steering pump reservoirs and related components.
3. Power steering pump reservoir filler cap/dipstick.

DISASSEMBLY

1. Remove pump, pump mounting brackets and pump pulley.

Fig. 2 End Plate Retaining Ring Removal:

2. Remove pump end plate retaining ring as follows:
a. Position a socket (1) on the pump shaft and end plate.
b. Mount pump and sockets in a vise as shown.
c. Tighten fixture slightly to compress spring under end plate.
WARNING: End plate is under spring pressure. Use caution when removing retaining ring to avoid personal injury.
d. Insert a punch (2), into access hole in pump and push ring outward.
e. Remove retaining ring (3), with a screwdriver, release vise jaws and remove pump and sockets from vise.

Fig. 3 End Plate Removal:

3. Place pump into vise with wood blocks between shaft end of pump housing and vise jaws.
4. Remove end plate by gently rocking back and forth, or tapping with a soft mallet.

Fig. 4 Flow Control Valve Removal:

5. Remove high pressure fitting and O-ring from housing, then remove flow control valve and spring noting position for assembly.
6. Remove pressure plate spring and pressure plate.

Fig. 5 Pump Ring, Rotor & Rotor Vanes Removal:

7. Tap pump shaft from housing, then remove shaft retaining ring, pump ring, rotor and vanes and thrust plate from the shaft.
8. Remove thrust plate and dowel pins.

Fig. 6 Pump Seal Removal:

9. Remove pressure plate and end plate O-rings from pump housing.
NOTE: Do not remove the pump shaft seal.

INSPECTION

1. Clean all parts with solvent and blow dry with compressed air.
2. Inspect flow control valve for nicks, scratches and burrs. Clean up minor surface marks with crocus cloth. Replace valve as an assembly if damaged.
3. Check pressure and thrust plates for flatness and replace if worn or scored.
4. Inspect pump ring and replace if damaged in any way.
5. Inspect thrust plate dowels, pressure plate spring, rotor, splines and surfaces for distortion or any other damage. Replace as needed.
6. Inspect pump shaft and splines and replace if scored or damaged. Replace shaft retaining ring.
7. Inspect pump housing and bores, and pump fittings for wear and porosity. Replace as necessary.
8. Inspect end plate and end plate retaining ring. Replace if damaged or distorted in any way.

Fig. 7 Pump Ring Installation:

ASSEMBLY

CAUTION: Ensure all parts are clean and lubricated with clean power steering fluid. Dirt will cause noise, leaks, and accelerated wear.

1. Install pressure plate and end plate O-rings in housing, then install thrust plate dowels in housing.
2. Install thrust plate and rotor on pump shaft. Be sure rotor is installed with counterbore facing thrust plate, then secure rotor to shaft with retaining ring.
3. Align thrust plate to dowels and install shaft, rotor, and plate in pump.
4. Align pump ring to dowels and install over rotor. Ensure directional arrows are facing up.
5. Install rotor vanes with rounded edges facing outward.
6. Install pressure plate with spring groove facing upward, then install spring in groove.
7. Install end plate then end plate retaining ring as follows:
a. Position sockets on pump shaft and end plate, then position pump and sockets in a vise.
b. Tighten the vise slightly to compress spring under end plate, then install end plate retaining ring.
c. Remove pump and sockets from vise.
8. Install flow control valve and spring with hex nut side of valve toward bore.
9. Install O-ring and fitting in the flow control valve bore and torque to specifications, then position pulley on pump.
10. Install pump and fill reservoir to specified level.