LS 400 V8-4.0L (1UZ-FE) (1990)
Power Steering Pump: Service and Repair
Disassembly and Assembly
Disassembly
1.
Remove steering pump as outlined under REMOVAL/INSTALLATION.
2.
Mount pump in a suitable vise.
Fig. 11 Exploded View Of Power Steering Pump
3.
Remove three reservoir bolts then the reservoir and O-ring, Fig. 11.
4.
Remove air control valve.
5.
Remove pressure port union and O-ring.
6.
Remove flow control valve and spring.
7.
Using suitable snap ring pliers, remove spring seat snap ring.
8.
Temporarily install a bolt into the spring seat then remove the spring seat.
9.
Remove vane pump shaft with bearing as follows:
a. Using suitable snap ring pliers, remove pump shaft snap ring.
b. Temporarily install appropriate plate washer and pulley nut on shaft, then remove shaft using puller set tool No. 09910-00015 or equivalent.
10.
Remove rear bracket bolts, rear bracket and O-rings.
11.
Remove wave washer.
12.
remove front side plate, cam ring, rotor, vane plates and rear side plate as follows:
a. Using extension bar and press, remove front side plate, cam ring, rotor, vane plates and rear side plate as an assembly. Do not allow
components to fall from under side of pump when pressing out of housing.
b. Remove rear side plate and O-ring.
c. Remove cam ring, rotor and the ten vane plates.
d. Remove straight pin and two O-rings from front side plate.
e. Remove straight pin from front housing.
Inspection
1.
Measure oil clearance of shaft and bushing using suitable measuring tools. Maximum clearance is .0028 inch.
2.
Inspect rotor and vane plates using suitable measuring tools. Minimum height is .315 inch, minimum thickness is .0697 inch and minimum length
is .5894 inch.