Buick LeSabre 1965 Service Manual page 485

STEERING GEAR, STEERING COLUMNS AND LINKAGE
POWER STEERING 8 - 2 1
8-1
f.
4.
g.
1.
2.
3.
4.
5.
h.
1 TROUBLE DIAGNOSIS—POWER STEERING GEAR AND PUMP (Cont'd)
COMPLAINT AND CAUSE
NOISE (Cont
;
d)
Pump Noise.
(a) Loose belt.
(b) Hoses touching other parts of car.
(c) Low oil level.
(d) Air in the oil.
(e) Excessive back pressure caused by
hoses or steering gear.
(f) Scored pressure plate.
(g) Vanes not installed properly.
(h) Vanes sticking in rotor slots,
(i) Extreme wear of pump ring,
(j) Face of thrust plate scored.
(k) Scored rotor.
(1) Defective flow control valve.
CORRECTION
(a) Tighten belt.
(b) Adjust hose positions.
(c) Fill reservoir.
(d) Locate source of air leak and correct.
(e) Locate restriction and correct. With
pressure gauge installed in pressure
hose between pump and gear and engine
running at 1500 RPM, oil warm, and no
effort on the steering wheel, pressure
should not exceed 125 psi. See Figure
8-25. Check operation of check valve
poppet, paragraph 8-16, subparagraph
c, Step 6.
(f) Lap away light scoring. Replace heavily
scored part.
(g) Install properly.
(h) Free up by removing burrs or dirt,
(i) Replace part.
(j) Lap away light scoring. Replace heavily
scored part.
(k) Lap away light scoring. Replace heavily
scored part.
(1) Replace.
EXCESSIVE WHEEL KICKBACK OR LOOSE STEERING.
Air in system.
Excessive lash between pitman shaft sector
and rack-piston.
Loose thrust bearing adjustment.
Rack-piston nut to worm preload too low.
Incorrect installation or operation of the
gear check valve poppet.
1.
2.
3.
4.
5.
Add oil to pump reservoir and bleed.
Adjust to specification.
Remove gear and adjust to specification.
Remove rack-piston nut and worm, and
change balls to obtain specified preload.
Check operation of valve, paragraph 8-16,
subparagraph c, Step 6.
STEERING WHEEL SURGES OR JERKS WHEN TURNING WITH ENGINE RUNNING
Loose pump belt.
Adjust to specification.