GMC 1990 Light Truck Repair Manual page 130

3B3-16 POWER STEERING
1. Housing
2. Sleeve
3. Dowel Pin
4. O-Ring Seal
5. Pressure
Plate Spring
6. O-Ring Seal
7. Pressure Plate,
8. Dowel Pin
Figure 39— Remove and Install Return lUbe
— Rotor slots for burrs and excessive wear at
the thrust faces.
— Inner surface of the pump ring (11) for scor­
ing or wear.
— Thrust plate (13) and pressure plate (7) for
wear on the plate surfaces.
— If heavy wear is present, or parts are faulty,
replace the entire rotating group.
2. Bearing (18). If the bearing is rough or loose,
replace it.
— Seal (16)for leakage, cracking, or swelling. If
so replace.
Vane 13. Thrust Plate
Rotor 14. Thrust Plate Retaining Ring
Pump Ring
15. Return Tube
O-Ring Seal
10 9
Figure 37— Pump Housing Components
8
Pressure Plate Spring
3. Driveshaft (17) for excessive burning or scor­
ing.
— Bearing bore for excessive scoring or burning.
4. Control valve (15). It must move smoothly in
the valve bore.
ASSEMBLY
E
Install or Connect (Figures 28, 39 through 45)
1. Return tube (15) (figure 39) or reservoir (24) (figure
28) depending on model.
2. Sleeve (2) (figure 40).
3. Dowel pin (3) (figure 41).
4. O-ring seal (4).
5. Pressure plate spring (5).
F2152