Chevrolet 70 1969 Series, Shop Manual

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STEERING 9-22
2. Check fit of vanes in slots of rotor for tightness or ex­
cessive looseness. Vanes m ust fit snugly but slide free­
ly in slots of rotor. Tight fit of vanes in rotor can
easily be corrected by, thorough cleaning. Replace
rotor if excessive looseness exists between rotor and
vanes. Replace vanes if worn or scored.
3. E xam ine m achined surfaces of pum p ring for rough­
ness or wear. Replace ring if roughness cannot be cor­
rected with crocus cloth.
4. Inspect thrust plate, pressure plate, and end plate for
wear, scores, or other dam age.
5. Inspect pum p housing for cracks or dam age. Check
housing for evidence of wear or scoring.
6. C heck all springs for free length, com pressed length,
distortion, or collapsed coils.
7. Inspect locating dowel pins for distortion.
8. Exam ine outer diam eter of flow control valve for
scoring or roughness. Slight dam ag e m ay be cleaned
up with crocus cloth. C heck valve assem bly for free­
dom of m ovem ent in bore of pum p housing.
9. Check all oil passages in pum p parts for obstructions.
Use a piece of tag wire to remove obstructions.
10. Check bushing in pum p housing for wear or dam age.
ASSEMBLY
Key num bers in text refer to figure 2.
1. Lubricate new O-ring seals (8, 11, and 14) with vase­
line and install in pum p housing.
2 0 19
1 Drive Shaft
2 Drive Shaft Woodruff Key
3 Snap Ring
4 Shaft Outer Bearing Assy.
5 Drive Shaft Oil Seal
6 Shaft Needle Bearing
7 Pump Housing
8 Housing to Reservoir O-ring
Seal
10
11
12
13
14
15
16
End Plate O-ring Seal
End Plate Retaining Ring
End Plate
Reservoir Rear Mounting Stud
Pressure Plate Spring
Pump Ring Dowel Pin
Pressure Union and Filter
Assy.
17 Pressure Union O-ring Seal
18 17
18 Pressure Union O-ring Seal
19 Pressure Plate O-ring Seal
20 Pressure Plate
21 Flow Control Valve
22 Flow Control Valve Spring
23 Pump Ring
24 Pump Vane
25 Pump Rotor
26 Thrust Plate
T-ii
64
F ig u re 1— P o w e r Ste eriing H y d r a u lic P u m p M o d e l ( 2 3 5 P - 3 6 ) T yp ical
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L