Chevrolet 10 1971 Series Chassis Service Manual page 362

STEERING 9-22
Fig. 40— O i l Pressure G a u g e J-5 1 7 6 Installed
ber one results in readings indicating faulty hydraulic
operation, test number two will identify the faulty part.
Before performing hydraulic circuit test, carefully check
belt tension and condition of driving pulley.
Test Number One— Oil Circuit Open
Engine must be at normal operating temperature. In­
flate front tires to correct pressure. All tests are made
with engine idling, so adjust engine idle speed to correct
specifications listed in Section 6 and proceed as follows:
a. With engine not running, disconnect flexible pres­
sure line from pump and install Tool J-5176 as
shown in Figure 40. Gauge must be between shut-
off valve and pump. Shut-off valve must be open.
b. Remove filler cap from pump reservoir and check
fluid level. Fill pump reservoir to full mark on
dip stick. Start engine and, holding steering wheel
against stop, check connections at Tool J-5176 for
leakage. Bleed system as outlined under Mainte­
nance and Adjustments. Insert thermometer (Tool
J-5421) in reservoir filler opening (fig. 41). Move
steering wheel from stop to stop several times
until thermometer indicates that hydraulic fluid in
reservoir has reached temperature of 150° to
170°.
To prevent scrubbing flat spots on
CAUTION:
tires, do not turn steering wheel more than five
times without rolling vehicle to change tire-to-r
floor contact area.
COMPONENT REPLACEMENT A N D REPAIRS
POWER STEERING GEAR
Removal (Fig. 42)
1. Disconnect hoses at gear. When hoses are discon­
nected, secure ends in raised position to prevent
drainage of oil. Cap or tape the ends of the hoses
to prevent entrance of dirt.
2. Install two plugs in gear fittings to prevent entrance
of dirt.
Fig. 41— C h e c k in g Fluid Temperature
c. Hold steering wheel against a stop momentarily
and read pressure gauge. If the maximum pres­
sure is below specifications, a faulty hydraulic
circuit is indicated.
faulty, proceed with test number two.
Test Number Two— Oil Circuit Closed
a. Slowly turn shut-off valve on J-5176 to closed
position and read pressure indicated on gauge.
Quickly reopen valve to avoid pump damage.
indicated pressure is less than specification,
pump output is below requirement and pump may
be considered faulty. If pressure indicated is
within specifications, it may be safely assumed
that the external hoses, connections or steering
gear is at fault.
If pump proves faulty in test number
NOTE:
two, test should be repeated after pump is re­
paired and installed in vehicle. This will pro­
vide a means of checking the repairs made to
the pump and the condition of the steering gear,
which may also be faulty.
3. Remove the flexible coupling to steering shaft flange
bolts (C-K models) or the lower universal joint pinch
bolt (P models). Mark the relationship of the universal
yoke to the stub shaft.
4. Mark the relationship of the pitman arm to the pitman
shaft. Remove the pitman shaft nut or pitman arm
pinch bolt and then remove the pitman arm from the
pitman shaft using Puller J-6632 (fig. 1).
To determine which part is
If
10-30 CHEVROLET TRUCK SERVICE MANUAL