GMC 1990 Light Truck Repair Manual page 132

3B3-18 POWER STEERING
Drive Shaft
Seal
O-Ring Seal
Housing
O-Ring Seal
Pin
Thrust Plate
F iller Cap
Flow Control Valve
Flow Control Spring
O-Ring Seal
Pump Rotor
Shaft Retainer
Ring
Vane
Pump Ring
Pressure Plate
Pressure Plate
Spring
67. Housing End Plate
68. End Plate Retaining Ring
69. Reservoir Seal
70. Reservoir Assem bly
_________________________________________________________________________________________ F6804
8. Pressure plate (65). Tap lightly on the driveshaft
with a rubber mallet.
9. Pump ring (64) and vanes (63).
10. Shaft retaining ring (62).
11. Pump rotor (61).
12. Thrust plate (56).
13. Driveshaft (50).
14. Seal (51) from the housing (53).
15. Dowel pins (55).
16. O-rings (54).
17. Seal (52).
CLEANING AND INSPECTION
fim B
Piiyl Clean
• All parts with solvent and blow dry.
46)
Inspect (Figure
1. Rotating group components.
— Vane (63) tips for scoring or wear.
— Fit of vanes (63) in rotor (61) for sticking or
excessive play.
— Rotor slots for burrs and excessive wear at the
thrust faces.
— Inner surface of the pump ring (64) for scoring
or wear.
— Thrust plate (56) and pressure plate (65) for
wear on plate surfaces.
— If heavy wear is present, or parts are faulty,
replace the entire rotating group.
71. BoltorStud
72. Seal
73. Fitting
Figure 46— Power Steering Pump— Model P
[T
2. Seal (51) for leakage, cracking or swelling. If so,
replace seal.
3. Driveshaft (50) for excessive burning or scoring.
4. Control valve (58). It must move smoothly in the
valve bore.
ASSEMBLY
Install or Connect (Figure 47)
Tc
>ol Required:
J-7728 Seal Installer
Important
Lubricate the O-rings (54), pump ring (64), rotor
(61) and vanes (63) with power steering fluid.
1
Dowel pins (55) and O-rings (54).
.
2.
Seal (51) using J-7728.
3. O-ring (52).
4. Driveshaft (50)
5.
Thrust plate (56).
6.
Rotor (61). Make sure the counterbore faces the
driveshaft end of the housing.
7. Vanes (63), the rounded edge faces away from the
rotor.
8. Shaft retaining ring (62).
9. Pump ring (64).
10. Pressure plate (65).
11. O-ring (60).
12. Control valve spring (59).
Control valve (58).
13.