Chevrolet BEAUVILLE SPORTVAN G10 SERIES, Руководство по обслуживанию

Страница: 285 / 350

STEERING 9-19
PRESSURE
■ HOSE ■
RETURN
L
h o s e
I
GAUGE VALVE
Fig. 3 1 —Checking Power Steering Pressures
eating fau lty hydraulic o p era tio n , test num ber tw o will
id en tify the faulty p art. Before perform ing hydraulic circuit
test, carefully check belt tension and condition o f driving
pulley.
Test Number One—Oil Circuit Open
Engine m u st be a t n orm al operating tem p eratu re. Inflate
fro n t tires to correct pressure. All tests are m ade w ith engine
idling, so adjust engine idle speed to correct specifications
listed in Section
6
and pro ceed as follow s:
a. With engine n o t running, disconnect flexible pres­
sure line from pum p and install Tool J-5176 as
show n in Figure 31. Gauge m ust be betw een shut-
o f f valve an d pu m p . S h u t-o ff valve m ust be open.
b . Rem ove filler cap from pum p reservoir and check
fluid level. Fill p u m p reservoir to full m ark o n dip
stick. S tart engine and, holding steering wheel
against sto p , check connections a t Tool J-5176 for
leakage. Bleed system as outlined u nder M ainte­
nance and A djustm ents. Insert th e rm o m ete r (Tool
J-5 4 2 1 ) in reservoir filler opening. Move steering
w heel fro m stop to sto p several tim es until ther­
m o m eter indicates th a t hydraulic fluid in reservoir
has reached tem perature o f 150° to 170°.
C A U T IO N : To prevent scrubbing fla t spots on
tires, do not turn steering wheel more than five
times w ith o u t rolling vehicle to change tire-to -floo r
contact area.
c. H old steering wheel against a stop m om entarily and
read pressure gauge. If the m axim um pressure is
below specifications, a faulty hydraulic circuit is
indicated. To determ ine w hich p art is faulty, p ro ­
ceed w ith te st num ber tw o.
Test Number Two—Oil Circuit Closed
a. Slowly tu rn shu t-o ff valve on J-5176 to close
position an d read pressure in d icated on gauge.
Q uickly reopen valve to avoid pum p damage. If
in dicated pressure is less than specification, pum p
o u tp u t is below requirem ent and pum p m ay be
considered faulty. I f pressure indicated is w ithin
specifications, it m ay be safely assum ed th a t the
extern al hoses, connections or steering gear is at
fault.
N O T E : I f pum p proves fau lty in test number tw o ,
test should be repeated after pump is repaired and
installed in vehicle. This w ill provide a means of
checking the repairs made to the pump and the
condition o f the steering gear, which may also be
fa u lty .
COMPONENT REPLACEMENT AND REPAIRS
POWER STEERING GEAR
Removal
1. D isconnect hoses a t gear. When hoses are disconnected,
secure ends in raised position to prevent drainage o f oil.
Cap or tape the ends o f th e hoses to prevent entrance o f
dirt.
2. Install tw o plugs in gear fittings to prevent entrance o f
dirt.
3. Rem ove the flexible coupling to steering shaft flange
bolts.
4. M ark th e relationship o f th e p itm an arm to th e pitm an
shaft. Rem ove th e p itm an shaft n u t o r p itm an arm pinch
b o lt and then rem ove th e p itm an arm from th e pitm an
sh a ft using Puller J - 6 6 3 2 .
C H E V Y V A N S H O P M A N U A L