Chevrolet CHEVY VAN G10 SERIES Service Manual page 285

RETURN
L I
h o s e
GAUGE VALVE
Fig. 3 1 —Checking Power Steering Pressures
eating faulty hydraulic operation, test num ber tw o will
identify the faulty part. Before perform ing hydraulic circuit
test, carefully check belt tension and condition o f driving
pulley.
Test Number One—Oil Circuit Open
Engine m ust be a t norm al operating tem perature. 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
6
listed in Section and proceed as follows:
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 ff valve and pum p. S hut-off valve m ust be open.
b. Remove filler cap from pum p reservoir and check
fluid level. Fill p um p reservoir to full m ark o n dip
stick. S tart engine and, holding steering wheel
against stop, check connections a t Tool J-5176 for
COMPONENT REPLACEMENT AND REPAIRS
POWER STEERING GEAR
Removal
1. D isconnect hoses at gear. When hoses are disconnected,
secure ends in raised position to prevent drainage o f oil.
Cap or tape the ends o f the hoses to prevent entrance o f
dirt.
2. Install tw o plugs in gear fittings to prevent entrance o f
dirt.
leakage. Bleed system as outlined under M ainte­
nance and A djustm ents. Insert therm om eter (Tool
J-5421) in reservoir filler opening. Move steering
w heel from stop to stop several times until ther­
m om eter indicates th a t hydraulic fluid in reservoir
PRESSURE
has reached tem perature o f 150° to 170°.
■ HOSE ■
C A U T IO N : To
tires, do not turn steering wheel more than five
times w ith o u t rolling vehicle to change tire-to-floor
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 test num ber tw o.
Test Number Two—Oil Circuit Closed
a. Slowly tu rn shut-off valve on J-5176 to close
position an d read pressure indicated on gauge.
Quickly reopen valve to avoid pum p damage. If
indicated pressure is less than specification, pum p
o u tp u t is below requirem ent and pum p may be
considered faulty. I f pressure indicated is w ithin
specifications, it may be safely assum ed th a t the
external hoses, connections or steering gear is at
fault.
N O T E : I f pump 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
fau lty.
3. Remove the flexible coupling to steering shaft flange
bolts.
4. M ark the relationship o f the pitm an arm to the pitm an
shaft. Remove th e pitm an shaft n u t or p itm an arm pinch
b o lt and then remove th e pitm an arm from th e pitm an
shaft using Puller J -6 6 3 2 .
STEERING 9-19
prevent scrubbing fla t spots on
C H E V Y V A N SH O P M A N U A L