Chevrolet 10 Series 1968, Service Manual

Page: 546 / 713

STEERING 9-13
Fig. 24—C h eckin g Belt Tension with Tool J —7316
10.
Check oil level and refill as required.
11. If oil is extremely foamy, allow vehicle to stand a
few minutes with engine off and repeat above
procedure.
a. Check belt tightness and check for a bent or loose
pulley. (Pulley should not wobble with engine
running.)
b. Check to make sure hoses are not touching any
other parts of the car, particularly sheet metal.
c. Check oil level, filling to proper level if neces­
sary, following operations
1
through
10.
This step
and Step “ D” are extremely important as low oil
level and/or air in the oil are the most frequent
causes of objectionable pump noise.
d. Check the presence of air in the oil. A ir will show
up as a milky appearing oil. If air is present,
attempt to bleed system as described in opera­
tions
1
through
10.
If it becomes obvious that the
pump will not bleed after a few trials, proceed as
outlined under Hydraulic System Checks.
FLUID LEVEL
1. Check oil level in the reservoir by checking the dip
stick when oil is at operating temperature. On
models equipped with remote reservoir, the oil level
should be maintained approximately
1/2 to 1 inch
from top with wheels in full left turn position, unless
a side mounted power cylinder is used. On these
models, check with wheels in full right turn position.
2. Fill, if necessary, to proper level with GM Power
Steering Fluid or, if this is not available, automatic
transmission fluid "Type
A ”
bearing the mark
"A Q -A T F ” followed by a number and the suffix
letter
“ A ” .
Fig. 2 5 —Tool J-5 1 7 6 Installed
PUMP BELT TENSION
1. Loosen nut on pivot bolt and pump brace adjusting
nut.
C A U TIO N : Do not move pump by prying against
reservoir or by pulling on fille r neck.
2. Move pump, with belt in place until belt is tensioned
to specifications as indicated by Tool J-7316 (fig. 24).
3. Tighten pump brace adjusting nut. Then tighten pivot
bolt nut.
HYDRAULIC SYSTEM CHECKS
The following procedure outlines methods to identify
and isolate power steering hydraulic circuit difficulties.
This test is divided into two parts. Test number one pro­
vides means of determining whether power steering sys­
tem hydraulic parts are actually faulty. If test number
one results in readings indicating faulty hydraulic opera­
tion, test number two will identify the faulty part. Before
performing hydraulic circuit test, carefully check belt
tension and condition of driving pulley.
Test Number O ne—O il 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 25. 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 fille r opening (fig. 26). Move
steering wheel from stop to stop several times
until thermometer indicates that hydraulic fluid
in reservoir has reached temperature of 150°
to 170°.
CA U TIO N :
To prevent scrubbing flat spots on
tires, do not turn steering wheel more than five
CHEVROLET TRUCK SERVICE MANUAL