Cleaning And Inspection; Assembly - GMC 1989 Light Duty Truck Repair Manual

F. Press
K. Bar S to c k
13. T h ru s t Plate
14. T h ru s t Plate
R e ta in in g R ing
Figure 36— Removing the Thrust Plate
17. Vanes (9).
8
18. Dowel pins ( ).
19. Pressure plate (7).
6
20. O-ring ( ).
21. Pressure plate spring (5).
22. O-ring seal (4).
23. Dowel pin (3).
24. Sleeve (2) (figure 38).

CLEANING AND INSPECTION

131
Clean
All parts with solvent and blow dry.
Inspect (Figure 38)
1 ?
Rotating group components.
1
.
Vane (9) tips for scoring or wear.
Fit of vanes (9) in the rotor (
fit properly in the rotor slots, without sticking or
excessive play.
1 . H o u sin g
2 . Sleeve
3. Dowel Pin
4. O-Ring Seal
5. Pressure
14
Plate S p rin g
6 . O-Ring Seal
7. Pressure P l a t e / \
8 . D owel Pin
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1
0). The vanes must
9. Vane T h ru s t Plate
10 . R o to r T h ru s t Plate R e ta in in g R ing
11 . P um p R ing R eturn Tube
12 . O -R ing Seal
13 12 11
Figure 3 7 — P um p Housing C o m p o n en ts
POWER STEERING 3B3-17
— Rotor slots for burrs and excessive wear at the
thrust faces.
— Inner surface of the pump ring (
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.
3. Driveshaft (17) for excessive burning or scoring.
— Bearing bore for excessive scoring or burning.
4. Control valve (15). It must move sm oothly in the valve
bore.

ASSEMBLY

-►4-
Install or Connect (Figures 28, 39 through 45)
Return tube (15) (figure 39) or reservoir (24) (figure 28)
depending on model.
Sleeve (2) (figure 40).
Dowel pin (3) (figure 41).
O-ring seal (4).
Pressure plate spring (5).
O-ring seal ( 6 ) (figure 42).
Pressure plate (7). Mark top of pressure plate directly
over the pin hole in the plate.
8
Dowel pin ( ).
Important
Lubricate the O-ring (12), pump ring (
and vanes (9) with power steering fluid.
9.
Vane (9). The rounded edge of the vanes face away
from the rotor.
10. Rotor (10). Make sure the counterbore faces the
driveshaft end of the housing (figure 43).
11 11
. Pump ring ( ). Make sure the identification marks
face up (figure 44).
O-ring seal (12).
12
.
13. Thrust plate (13).
• The dim ples in the thrust plate should line up
11 ) for scoring or
11
), rotor (10),
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