Buick LeSabre 1965 Service Manual page 483

STEERING GEAR, STEERING COLUMNS AND LINKAGE POWER STEERING 8 - 1 9
8 - 1 1 TROUBLE DIAGNOSIS-POWER STEERING GEAR AND PUMP (Cont'd)
c.
8.
9.
10.
11.
12.
13.
14.
d.
1.
2.
3.
e.
COMPLAINT AND CAUSE
PUMP INOPERATIVE OR POOR OR NO ASSIST
Extreme wear of pump ring.
Scored pressure plate, thrust and/or rotor.
Vanes not installed properly.
Vanes sticking in rotor slots.
Faulty flow control valve assembly.
" 0 " ring improperly installed on pres-
sure union.
End plate improperly installed or seal
damaged.
CORRECTION
(Cont'd)
8.
9.
10.
11.
12.
13.
14.
Replace part.
Lap away light scoring. Replace heavily
scored parts.
Install properly.
Free up by removing burrs or dirt.
Replace assembly.
"0" ring must be in groove nearest outlet
of union.
Install properly. Replace seal.
MOMENTARY INCREASE IN EFFORT WHEN TURNING WHEEL FAST TO THE RIGHT OR TO
THE LEFT
Air in system.
Low oil level in pump.
High internal leakage.
EXTERNAL OIL LEAKS
1.
2.
3.
Bleed gear.
Check oil level in pump reservoir.
Replace rack-piston ring and back-up "O"
ring, rack-piston nut end plug seal, and/or
replace valve.
NOTE: Wipe gear and pump thoroughly and make sure source of leakage is determined.
1.
2.
Gear leaks.
(a) Loose hose connections.
(b) Damaged hose.
(c) Side cover "O" ring seal.
(d) Pitman shaft seal.
(e) Housing end plug " 0 " ring seal.
(f) Adjuster plug "O" ring seal.
(g) Torsion bar"O" ring seal (See Figure
8-15).
(h) Pitman shaft lash adjuster nut.
(i) Stub shaft seal.
Pump leaks.
(a) Oil leaking at top of reservoir as it is
too full.
(b) Oil leaking at top of reservoir caused
by air bubbles in oil.
(c) Reservoir "O" ring seal damaged or im-
properly installed.
(a) Tighten.
(b) Replace.
(c) Replace seal.
(d) Replace seals.
(e) Replace seal.
(f) Replace seal.
(g) Replace valve.
(h) Replace nut.
(i) Replace seal.
(a) Remove oil to proper level.
(b) Locate source of air leak and correct.
(c) Replace "O" ring.